9. Thermal energy (heat) is defined as
A. the sum of all the kinetic energies of all the particles in an object
B. the average of all the kinetic energies of all the particles in an object
C. the sum of all the numbers of particles in an object
D. the average number of particles in an object

the string experiences max tension at the lowest point,

By Work energy theorem, the min speed required at the lowest point to complete a vertical circle is [tex]\sqrt{5gl}[/tex] where L is the length of the string, corresponding to this the max tension comes out to be 6mg=15N, thus we can say that the ball will never be able to complete the vertical circle,

this is the actual scenario, and the question is irrelavent.

but if need be, to get an answer,

at the top point,

T + mg = m[tex]v^{2}[/tex]/r

14 + 15 = 0.25*[tex]v^{2}[/tex]*2

[tex]\sqrt{58\\}[/tex] = v

As the frequency of an AC source is increased, the current in an AC-RL circuit increases, up to the point where the inductive reactance of the inductor equals the resistance of the resistor. This is known as the resonant frequency of the circuit.

At the resonant frequency, the current reaches a maximum value and remains constant, regardless of further changes in the frequency. Above the resonant frequency, the current begins to decrease as the inductive reactance of the inductor increases faster than the resistance of the resistor. This is known as the anti-resonance frequency of the circuit.

In a series AC-RL circuit, the current is in phase with the voltage and the voltage and current are 90 degrees out of phase in a parallel AC-RL circuit. The total current in the circuit is determined by the frequency, inductance and resistance in the circuit, and the impedance of the circuit. The impedance is the ratio of the voltage to the current, and it increases as the frequency increases. This means that the current decreases as the frequency increases, as the inductor has an increasing inductive reactance.

The maximum current in the circuit is achieved when the inductive reactance of the inductor equals the resistance of the resistor, known as the resonant frequency of the circuit. Above the resonant frequency, the current begins to decrease as the inductive reactance of the inductor increases faster than the resistance of the resistor.

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Between the point of projection and the point of maximum height, the mass's mechanical energy due to air resistance changes by -245 J.

The equation y = h + V y t  g t 2 / 2 y=h+Vytgt2/2 describes the vertical distance from the ground, where g represents the acceleration of gravity.

The work-energy concept may be used to compute the modification in mechanical energy of the mass brought on by air resistance:

ΔE = W_net

At the point of projection, the mechanical energy of the mass is:

E_i = 1/2 * m * v_i²

where m is the mass of the object, and v_i is the initial velocity.

E_i = 1/2 * 2.0 kg * (35 m/s)² = 1225 J

At the maximum height, the mass has zero velocity, so its mechanical energy is entirely potential energy:

E_f = m * g * h

E_f = 2.0 kg * 9.8 m/s² * 50 m = 980 J

The net work done on the mass is equal to the difference between its initial and final mechanical energies:

W_net = E_f - E_i

= 980 J - 1225 J

= -245 J

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They will have an overall voltage equivalent to the sum of the individual battery voltages.

When two batteries are connected in series, the negative terminal of one battery is connected to the positive terminal of the other. This creates a circuit in which electrons flow from the negative terminal of the first battery, through the circuit, and into the positive terminal of the second battery.

The overall voltage of the combined batteries will be equal to the sum of the individual battery voltages. For example, if two batteries are connected in series and each has a voltage of 1.5V, then the total voltage of the combination will be 3V.

This is because the voltage of the first battery is added to the voltage of the second battery. The same principle applies when more than two batteries are connected in series. The total voltage of the combination will be equal to the sum of the individual battery voltages.

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Triton is a captured moon because of its highly inclined and retrograde orbit. Its capture might be relevant to its geological activity because it would have caused to undergo significant changes, which include the formation of cryovolcanoes, its internal structure.

Triton is a moon of Neptune that is thought to be a captured moon. The orbit of Triton is unlike any other moon in our solar system, as it is not in the equatorial plane of Neptune and is tilted at an angle of 23.5 degrees. Triton is thought to have been captured from the Kuiper Belt, a region of the solar system that lies beyond Neptune, and its capture was most likely caused by a collision between Neptune and a large Kuiper Belt object. The capture of Triton could be relevant to its geological activity as it may have caused the moon to heat up internally, leading to the formation of a subsurface ocean and cryovolcanism.

The capture of Triton could have caused it to heat up internally, which may have led to the formation of a subsurface ocean. This is because the capture of Triton would have involved a transfer of energy from Neptune to the moon, which would have caused it to heat up. The transfer of energy would have occurred due to tidal forces, which are caused by the gravitational attraction between Neptune and Triton. As Triton was captured, it would have been subjected to strong tidal forces that would have caused it to heat up, leading to the formation of a subsurface ocean.

Cryovolcanism is another geological activity that is associated with the capture of Triton. Cryovolcanism is the eruption of volatiles such as water, ammonia, and methane instead of lava. Triton is thought to have cryovolcanoes, which are similar to volcanoes on Earth, but instead of lava, they erupt water and other volatiles. The capture of Triton would have caused it to undergo significant changes, which would have included the formation of cryovolcanoes.

The capture of Triton could also have caused it to become a geologically active moon. This is because the capture of Triton would have caused it to undergo significant changes, which would have included the formation of cryovolcanoes. The geological activity of Triton may also be related to its internal structure, which is thought to be differentiated, meaning that it has a core, mantle, and crust.

The differentiation of Triton may have also played a role in its geological activity, as it may have caused the moon to be more geologically active than it would have been otherwise.

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The first two nonvanishing terms in V(z) for z » the radius of the ring are V(z) = Q/4πε0z + Qa2/4πε0z3. They correspond to the monopole and quadrupole moments, respectively.

he potential V(z) due to a ring of charge on the axis of symmetry can be expanded in a power series in z. The first two nonvanishing terms in this series are obtained by taking the limit z » the radius of the ring, which gives V(z) ≈ Q/4πε0z + Qa2/4πε0z3, where Q is the total charge on the ring and a is the radius of the ring.

The first term corresponds to the monopole moment, which represents the total charge of the ring. The second term corresponds to the quadrupole moment, which represents the deviation of the charge distribution from spherical symmetry. By symmetry, the dipole moment must be zero, since the charge distribution is symmetric about the axis of the ring.

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The total distance described by the rubber ball before it comes to rest is 100 meters.

At the first drop, the ball falls from a height of 50 meters, and then rebounds to a height of 25 meters. So, the distance covered in the first drop and rebound is 50 + 25 = 75 meters.

At the second drop, the ball falls from a height of 25 meters and rebounds to a height of 12.5 meters. So, the distance covered in the second drop and rebound is 25 + 12.5 = 37.5 meters.

At the third drop, the ball falls from a height of 12.5 meters and rebounds to a height of 6.25 meters. So, the distance covered in the third drop and rebound is 12.5 + 6.25 = 18.75 meters.

This process repeats until the height of the rebound is less than 0.01 meters, at which point we consider the ball to have come to rest.

The total distance covered by the ball is the sum of all the distances covered during each drop and rebound, which is:

75 + 37.5 + 18.75 + 9.375 + 4.6875 + 2.34375 + ...

This is a geometric series with first term 75 and common ratio 1/2. Using the formula for the sum of an infinite geometric series, we get:

total distance = 75 / (1 - 1/2) = 100 meters.

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We must apply the following formula to determine the person's reaction time: [tex]d = 1/2 at^2[/tex] where: The distance travelled is d. (in this case, the distance the metre stick fell, which is 7 inches or 0.1778 meters). The reaction time is t.

The distance is influenced by the speed and reaction time (in seconds) (in feet per second).Reaction Distance = Response Time x Speed is the formula for calculating it.

After recognising the need for them, a driver uses the brakes in 0.20 seconds. This is referred to as the driver's reaction time. if he's operating a vehicle

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The frequency of a wave is the number of cycles it completes in a given period of time, and it can be calculated using the following equation: frequency = velocity/wavelength. In the case of this wave, the frequency is 0.1 Hz (or 10 cycles/second).

frequency = 20 m/s/200 m = 0.1 Hz
The frequency of a wave that travels at 20 m/s with a wavelength of 200 meters is 0.1 Hz.What is frequency?Frequency is the number of occurrences of a periodic event per unit of time. It is commonly used to determine the number of occurrences of a specific event in a given period of time.

The frequency equation is:f = v/λwhere:f is the frequency of the  v is the velocity of the wave (m/s)λ is the wavelength of the wave (m)Using the formula given above:f = v/λwherev = 20 m/sλ = 200 metersf = 20/200f = 0.1 HzTherefore, the frequency of the wave is 0.1 Hz.

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In order to make an energy analysis as easy as possible, the following objects should be included within the system: Data logging instrumentation, Microprocessor based controllers, and Electronic load controllers.

An Energy Analysis is a method of determining the energy consumption of a system. It is done to help identify and evaluate opportunities to reduce energy usage and cost, improve efficiency and reduce the environmental impact of the energy consumed.
Energy analyses assist in the identification of system inefficiencies and provide a basis for energy management decisions.

The objects included in the system to make energy analysis as easy as possible are as follows:

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The actual angles a and b in the molecule of which this is a Lewis structure are approximately 120°.

Lewis structures are a method for representing molecules using symbols for atoms and dots to show shared pairs of electrons. In the actual molecule, the positions of the atoms and the angles between them are not necessarily exactly the same as in the Lewis structure. However, based on the Lewis structure, we can make some predictions about the arrangement of atoms and the angles between them using the concept of valence shell electron pair repulsion (VSEPR).

According to VSEPR theory, the valence electron pairs in the outer shell of an atom will try to move as far apart from each other as possible to minimize repulsion. This leads to certain geometric arrangements of atoms and electron pairs, and certain bond angles.For the Lewis structure shown in the image, there are three bonded pairs of electrons and one lone pair of electrons around the central nitrogen atom. This corresponds to a tetrahedral arrangement with a bond angle of 109.5°. However, the lone pair of electrons exerts greater repulsion than the bonded pairs, which compresses the bond angles slightly.

The actual angles a and b are approximately 120°, which is slightly less than the tetrahedral angle of 109.5°.Therefore, the answer is approximately 120°.

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The braking force needed to bring the car to a halt in 2.0 seconds, given that the car has amass of 1100 Kg and was moving at 24 m/s is -13200 N

We'll begin our calculation by obtaining the deceleration of the car. This is shown below:

a = (v - u) / t

a = (0 - 24) / 2

a = -24 / 2

a = -12 m/s²

Haven obtained the deceleration, we shall determine the breaking force needed to halt the car. Details below:

Force = mass × deceleration

Breaking force = 1100 × -12

Breaking force = -13200 N

Thus, the breaking force needed to stop the car is -13200 N

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The resultant force, F, and its duration, t, when the force is constant, are multiplied to create the force's impulse. Motion is changed by the impulse of force, which in turn modifies momentum.

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Answer:

When two sound waves with the same frequency and amplitude interfere, they can either add up constructively, resulting in a louder sound, or cancel each other out destructively, resulting in no sound at all. Destructive interference occurs when the waves are out of phase by half a wavelength, which means that the distance between the two sources is equal to an odd multiple of half the wavelength.

In this case, the distance between the two sirens is 4.00 m, which is equal to one wavelength (λ) plus half a wavelength (λ/2) of the sound waves they emit. Therefore, the wavelength of the sound waves is λ = 4.00 m / 1.5 = 2.67 m.

To find the distance from the metal plate where the fire fighter can stand and hear destructive interference, we need to calculate the distance from the plate to the fire fighter that is equal to an odd multiple of half the wavelength. Let's call this distance "x".

If the fire fighter is standing in front of one siren, the distance from the plate to the fire fighter is:

d1 = x

If the fire fighter moves towards the plate by a distance of half the wavelength, the distance from the plate to the fire fighter becomes:

d2 = x - λ/2

The difference between these two distances must be an odd multiple of half the wavelength for destructive interference to occur:

d2 - d1 = -λ/2 = -(2.67 m / 2) = -1.335 m

Therefore, the fire fighter can stand at a distance of x = 1.335 m away from the metal plate and hear destructive interference.

The resistance of the wire is the slope of the line and it is 1.7

The resistance of a wire is a measure of how much it opposes the flow of electric current.

It is defined as the ratio of voltage across the wire to the current passing through it, and it is measured in ohms (Ω).

The resistance of the wire is the slope of the graph and this calculated by

=  change in the voltage / change in the current

= (5 - 0) / (3 - 0)

= 5 / 3

= 1.6667 approximately 1.7

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One solution to the depletion of mineral and energy resources is to increase resource efficiency and conservation.

Resource efficiency and conservation can be done by reducing waste and improving the efficiency of resource use in manufacturing, transportation, and consumption.

This can be achieved through measures such as recycling, using renewable energy sources, and developing more efficient technologies.

Overall, addressing the depletion of mineral and energy resources will require a combination of technological innovations, sustainable practices, and responsible policies that prioritize the long-term health of our planet and its resources.

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The magnitude of the gravitational force exerted by the wire on the point mass m is: |F| = 2G(M*m/L^2)

To solve this problem, we need to first find the gravitational force exerted by each small segment of the wire on the point mass m, and then integrate the force over the entire semicircle.

Let's consider a small segment of the wire of length dl, located at a distance r from the center of curvature of the semicircle. The mass of this segment can be written as dm = M(dl/L), since the wire is uniform. The gravitational force exerted by this segment on the point mass m is given by:

dF = G*(dm*m)/(r^2)

where G is the gravitational constant.

Substituting dm, we get:

dF = G*(Mm/L)(dl/r^2)

Now we need to integrate this expression over the entire semicircle. Since the wire is bent into a semicircle, the distance r from the center of curvature varies from 0 to L/2. Thus, the total gravitational force exerted by the wire on the point mass m is:

F = integral of dF from r=0 to r=L/2

= G*(Mm/L) * integral of (dl/r^2) from r=0 to r=L/2

= G(Mm/L) * (1/0 - 1/(L/2)^2)

= 2G*(M*m/L^2)

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The required magnitude of magnetic field is 0.6 T and the direction of magnetic field is in positive x-direction.

The expression for velocity, electric field and magnetic field when electric and magnetic fields are perpendicular to each other is,

v = E/B

where,

v is velocity

E is magnitude of electric field

B is magnitude of magnetic field

To find out the magnitude of magnetic field, let us make it as subject,

B = E/v = 2100/3500 = 0.6 T

The direction of velocity is given northwards. The direction of electric field is downwards. So, the direction of magnetic field is in positive x direction.

This is because, Electric field E, magnetic field B and velocity v are all perpendicular to one another.

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The difference in energy between the two stars with temperatures 10,000 K and 5,000 K is that the star with a temperature of 10,000 K has more energy than the star with a temperature of 5,000 K.

The degree or intensity of heat present in a substance or object, particularly expressed in degrees Celsius or Fahrenheit or as an equivalent in another scale is called temperature.Energy is the ability of a system or object to perform work on another object or system.Temperature is a measure of the amount of energy contained in a system or substance. The amount of energy in a substance or system is directly proportional to its temperature. Therefore, a substance with a higher temperature contains more energy than a substance with a lower temperature.

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a. To calculate the distance the stone must fall, we need to use the formula KE = ½ mv², where m is the mass of the object and v is the velocity of the object. First, calculate the total kinetic energy of the system:
[tex]KEtotal = ½ mPulley x v² + ½ mStone x v² = ½ (2.5 kg)(4.5 J) + ½ (1.5 kg)(4.5 J) = 6.75 J[/tex]

We then rearrange the equation to solve for v²: v² = 2 x KE / m = (2 x 6.75 J) / (1.5 kg) = 9 J/kg.Next, we need to calculate the velocity of the stone, vStone, which is equal to the square root of the above equation: vStone = √(9 J/kg) = 3 m/s

Finally, we need to use the equation s = vt, where s is the distance the stone falls, v is the velocity of the stone, and t is the time it takes for the stone to fall. We rearrange the equation to solve for t: t = s / v = 4.5 m / 3 m/s = 1.5 s Therefore, the stone must fall a distance of 4.5 m in order for the pulley to have 4.5 J of kinetic energy.

b. To calculate the percent of the total kinetic energy of the system that the pulley has, we need to use the equation: Percent of total KE = KEpulley/KEtotal x 100%. KEpulley = ½ mPulley x v² = ½ (2.5 kg)(4.5 J) = 4.5 J
Therefore, the percent of the total kinetic energy that the pulley has is 4.5 J/6.75 J x 100% = 66.67%.

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The capacitance of one of these axon membranes is 1.7× 10⁻⁸ Farad. The nervous system of the human body contains axons whose membrane each act as small capacitors.

The ability of a material object or device to store electric charge is referred to as capacitance. It is defined as the change in charge as a result of a difference in electric potential, expressed as a ratio of those quantities. There are two types of capacitance that are commonly recognized: self capacitance and mutual capacitance. An electrically charged object exhibits self capacitance, which is measured as the electric potential between the object and ground. Mutual capacitance is the measurement of capacitance between two components, and it is especially important in the operation of a capacitor, which is a basic linear electronic component designed to add capacitance to an electric circuit.

use formula ;

C = [tex]\frac{Q}{V}[/tex]

Q =   1.2x10⁻⁹C

V =  0.070 V

Charge C = 1.7× 10⁻⁸ Farad

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The terminal velocity depends directly on the drag force and the relationship between them is nonlinear.

The terminal velocity is the maximum velocity that a falling object can reach when the drag force of the surrounding fluid is equal to the gravitational force acting on the object. The drag force is dependent on the velocity of the object, and as the velocity increases, the drag force also increases.

However, the relationship between the drag force and velocity is nonlinear because the drag force is proportional to the square of the velocity. This means that as the velocity of the object increases, the drag force increases more rapidly. Therefore, the terminal velocity, which is the point at which the drag force balances the gravitational force, is reached when the nonlinear relationship between the drag force and velocity is balanced by the gravitational force.

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The collision between the tennis ball and the ground is an inelastic collision, as some energy was lost during the collision, indicating that it was not perfectly elastic.

The collision between the tennis ball and the ground is an example of an inelastic collision. During the collision, some energy is lost due to the deformation of the ball and the ground. This loss of energy is evidenced by the fact that the ball does not rebound to the same height from which it was dropped. In an elastic collision, the kinetic energy of the system is conserved, but in an inelastic collision, it is not. Inelastic collisions are characterized by permanent deformation of the objects involved, as energy is transformed into other forms such as heat and sound.

Therefore, based on the information given, we can conclude that the tennis ball and the ground experienced an inelastic collision when the ball was dropped from a height of 1.0 m, bounced off the ground, and rose to a height of 0.85 m.

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Answer:

ASAP................Research the use in the military of magnetic anomaly detectors, MADs. Write a brief 300-word essay answer the following questions on MADs. What is the main idea behind MADs? What can be detected by using MADs? A brief history of the MAD development.

Explanation:

The person-ladder system's centre of gravity is located 0.3 metres horizontally from the point where the ladder hits the ground.

The average position of an object's weight is known as its centre of gravity. Any object's travel through space may be entirely explained in terms of how its centre of gravity moves from one location to another.

According to the principle of moments, the total of the clockwise and anticlockwise moments is equal. In this instance, we could type:

[tex]W1 * d1 = (W1 + W2) * x[/tex]

We know that the total of the vertical forces acting on the ladder and the person is zero since they are both in equilibrium. Hence, we may write:

W1 + W2 = F

where F is the system's weight multiplied by the vertical force exerted on the ladder-person arrangement.

The two equations together give us:

W1 * d1 = F * x

Solving for x, we get:

x = (W1 * d1) / F

W1 = 200 N

W2 = 600 N

F = W1 + W2 = 800 N

we can see that d1 = 1.2 m and d3 = 0.8 m. Therefore:

x = (W1 * d1) / F = (200 N * 1.2 m) / 800 N = 0.3 m

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The center of gravity for the person-ladder system is 0.3 meters away from where the ladder touches the ground.

The sum of the clockwise and anticlockwise moments is equal, as per the moments' principle.

W1 × d1 = (W1 + W2)

Since the ladder and the person are both in equilibrium, we know that the sum of the vertical forces acting on them is zero. So, we may say:

W1 + W2 = F

Where F is the system's weight multiplied by the vertical force exerted on the ladder-person arrangement.

The two equations together give us:

W1 × d1 = F × x

Solving for x, we get:

x = (W1 × d1) / F

W1 = 200 N

W2 = 600 N

F = W1 + W2 = 800 N

d1 = 1.2 m and d3 = 0.8 m.

Therefore:

x = (W1 × d1) / F

= (200 N × 1.2 m) / 800 N

Distance = 0.3 m

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The block sliding downwards on an inclined rough plane accelerates with a magnitude of g sinθ − µg cosθ, where µ is the coefficient of kinetic friction. The maximum angle that the plane can make with the horizontal is tan−1 µ.There are no circumstances in which tilting over is excluded.

When a block of mass m slides down on an inclined rough plane, the force acting on it is its weight, which is in a downward direction. This can be resolved into two components: one that is parallel to the plane and the other that is perpendicular to it. The former tends to move the block down the plane, while the latter counteracts the normal force acting on the block. The acceleration of the block can be calculated as a result of the net force acting on it.

µ is the coefficient of kinetic friction.

The angle of the plane with the horizontal is denoted by θ.

The acceleration of the block is given by:

Under certain circumstances, tilting over is avoided. A block can be prevented from tilting over on an inclined plane by ensuring that the center of gravity of the block lies within the base of the plane.

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Now you have the formula for the ratio of the radii of gold and iron wires with equal resistance.

To find the ratio of the radii of iron and gold wires with equal resistance, we'll use the formula for resistance in terms of resistivity, length, and cross-sectional area.
1. Write down the formula for resistance:
  R = ρ * (L/A), where R is resistance,

ρ is resistivity,

L is length, and

A is the cross-sectional area of the wire.
2. Recall that the cross-sectional area A of a wire is given by A = π *[tex]r^2[/tex],

where r is the radius of the wire.
3. Replace A in the resistance formula with the area formula:
  R = ρ * (L/(π * [tex]r^2)[/tex])
4. Set up an equation for both iron and gold wires with equal resistance:
  ρ_Iron * (L_Iron/(π * r_I[tex]ron^2[/tex])) = ρ_Gold * (L_Gold/(π * r_[tex]Gold^2)[/tex])
5. Since the lengths of the wires are equal, L_Iron = L_Gold.

Also, cancel out π on both sides:
  ρ_Iron * (L/(r_[tex]Iron^2)[/tex]) = ρ_Gold * (L/(r_[tex]Gold^2)[/tex])
6. Solve for the ratio of the radii squared:
  (ρ_Iron/ρ_Gold) = (r_[tex]Gold^2/r[/tex]_[tex]Iron^2[/tex])
7. Find the square root of both sides to get the ratio of the radii:
  √(ρ_Iron/ρ_Gold) = r_Gold/r_Iron

To find the actual ratio, look up the resistivities of iron and gold, and plug the values into the formula.

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The answer is no, the effects of reference frames are not symmetrical. This is due to the theory of relativity.

According to Einstein’s special theory of relativity, the simultaneity of two events can be different in different reference frames. This means that events that appear to be simultaneous in one frame may not be so in another. The difference between the reference frames is caused by the varying relative speeds between them, and this difference leads to an asymmetry in the effects of the frames.

Einstein introduced the theory of special relativity, which says that time is not absolute but relative to the observer's state of motion. Einstein demonstrated that time is affected by speed and gravity. He showed that when an object moves at a high speed, time slows down, which is known as time dilation. Time dilation only happens at extremely high speeds or in the presence of massive gravitational fields, which causes it to become significant.

For example, if one frame is moving at a very high speed relative to another, then events that are simultaneous in the first frame may appear to be not simultaneous in the second frame, and vice versa. This asymmetry is a key concept in special relativity and is one of the primary concerns of reference frames.

Therefore, the answer to the question is that the effects are not symmetric between frames.

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To calculate the volume of the bottle, we can use the fact that the difference in mass when the bottle is empty and full of alcohol is equal to the mass of the alcohol it contains. So:

Mass of alcohol = 47 g - 15 g = 32 g

We know that the density of alcohol is 0.8 g/cm³, so:

Density = Mass / Volume

0.8 g/cm³ = 32 g / V

Solving for V, we get:

V = 32 g / 0.8 g/cm³ = 40 cm³

Volume of water = 40 cm³

Mass of water = Density x Volume

Mass of water = 1 g/cm³ x 40 cm³ = 40 g

Volume of mercury = 40 cm³

Mass of mercury = Density x Volume

Mass of mercury = 13.6 g/cm³ x 40 cm³ = 544 g

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(a) Work done by gravity on the watermelon is 1,182 J.(b)the watermelon's (i) kinetic energy just before it strikes the ground is 1,176.6 J and (ii) speed just before it strikes the ground is 48.49 m/s.The answer to part (b) would be different if there were appreciable air resistance.

(a)The given values are:

Mass of watermelon, m = 4.80 kg

Height from which watermelon is dropped, h = 25.0 m

Work done by gravity on the watermelon when it is displaced from the roof to the ground can be calculated as follows:

Work done by gravity, W = mg hwhere,g = acceleration due to gravity = 9.81 m/s²m = mass of the watermelon = 4.80 kg

h = height of the building from which the watermelon is dropped = 25.0 m

Substituting these values, we get:W = (4.80 kg) (9.81 m/s²) (25.0 m)W = 1,182 J

Therefore, the work done by gravity on the watermelon during its displacement from the roof to the ground is 1,182 J.

(b) The watermelon's (i) kinetic energy and (ii) speed just before it strikes the ground is:(i) Kinetic energy of the watermelon just before it strikes the ground can be calculated as follows:

Initial potential energy = mghInitial potential energy, U = (4.80 kg) (9.81 m/s²) (25.0 m)U = 1,176.6 J

Final kinetic energy, K = Initial potential energy, U

Therefore, Kinetic energy of the watermelon just before it strikes the ground is 1,176.6 J.

(ii) Let v be the speed of the watermelon just before it strikes the ground.

Kinetic energy = 0.5mv²where,m = mass of the watermelon = 4.80 kgK = Kinetic energy of the watermelon just before it strikes the ground = 1,176.6 J

Substituting these values, we get:K = 0.5mv²1,176.6 J = 0.5 (4.80 kg) v²2,353.2 J/kg = v²

Taking square root of both sides, we get:v = 48.49 m/s

Therefore, the watermelon's (i) kinetic energy just before it strikes the ground is 1,176.6 J and (ii) speed just before it strikes the ground is 48.49 m/s.

(c) The answer to part (b) would be different if there were appreciable air resistance. The kinetic energy of the watermelon just before it strikes the ground would be lower if there were appreciable air resistance because some of the initial potential energy of the watermelon would be lost to the air due to air resistance.

This means that the final kinetic energy of the watermelon would be lower if there were appreciable air resistance.

Learn more about air resistance here:

brainly.com/question/4428352

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