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Answer:

There are several basic ways to reduce sound: increasing the distance between source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using active antinoise sound generators.

11.76m is the maximum height achieved by a track star who goes into a long jump at 12m/s at an angle of 20.0 about the horizontal

Define projectile motion.

An object or particle that is projected into a gravitational field, such as from the surface of the Earth, and moves along a curved route only under the influence of gravity is said to be experiencing projectile motion.

Most calculations make the assumption that the effects of air resistance are passive and insignificant in the specific instance of Earth projectile motion. Galileo demonstrated that the curved path of objects in projectile motion is a parabola; however, in the unique situation where an object is hurled directly upwards, it may also be a straight line. Such a trajectory is a ballistic trajectory, which is the study of such movements.

v = u + at

a = g = 9.8m/s2

v = 0

u = 12 sin 20

t = 12 sin 20 /9.8 = 0.42 s

s = ut +1/2 at2

s = 12sin20 + 1/2 *9.8*0.42*0.42

s = 10.9 +.864 = 11.76m

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quiero una resolución para acer esto mandame un foto

The order of net coulombic measurement of the amount is (4) > (3) > (1) > (2) .

The Many Kinds of Electric Forces Electromagnetic forces can be divided into two categories: attractive electromagnetic forces and repellent electrical forces. Related crimes repel each other whereas opposite charges attract one another.

(1)   Net charge density force on charge q: magnitude  = kQq / R2  +  2 kQq cos(theta) / R2

                                                                   = k Q q ( 1 + 2 cos(theta) ) / R2

(2)   Net charge density force on charge q: magnitude = kQq / R2  +  2 kQq cos(theta) / (R/cos(theta))^2

                                                                = k Q q ( 1 + 2 cos3(theta) ) / R2

(3) Net charge density force on charge q: magnitude =  3 kQq / R2

(4)Net charge density force on charge q: magnitude=  kQq / (R/2)^2  = 4 kQq / R2

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The total sound pressure level of the five violins is 47 dB, which is 13 dB less than the sound pressure level of a single violin at 60 dB.

The total intensity of the five violins can be found by summing their individual intensities. The intensity of a sound wave is proportional to the square of the sound pressure level, so we can use the following equation:

I = I0 * 10^(L/10)

where;

Since each violin has a sound pressure level of 60 dB, the intensity of each violin can be calculated as follows:

I_violin = I0 * 10^(60/10) = 1e-12 * 1000 = 1e-9 W/m^2

The total intensity of the five violins can then be found by adding the individual intensities:

I_total = 5 * I_violin = 5 * 1e-9 = 5e-9 W/m^2

To find the sound pressure level corresponding to this total intensity, we can use the inverse of the equation above:

L = 10 * log10(I/I0)

L_total = 10 * log10(I_total/I0)

= 10 * log10(5e-9/1e-12)

= 10 * log10(5e3)

= 47 dB

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The speed of the basketball is 14.4 m/s if its kinetic energy is 109 J.

Kinetic energy is the energy possessed by an object due to its motion. It is defined as the energy that an object has because of its velocity, and it depends on the mass of the object and its speed. The formula for kinetic energy is [tex]K = 1/2 mv^2,[/tex]  where K is kinetic energy, m is the mass of the object, and v is its velocity.

The greater the mass and velocity of an object, the more kinetic energy it has. Kinetic energy is a scalar quantity, meaning that it only has magnitude and no direction. It is an important concept in physics and has many practical applications, such as in sports, transportation, and industrial machinery.

The kinetic energy (K) of an object with mass m and speed v is given by:

[tex]K = 1/2 * m * v^2[/tex]

Rearranging this equation, we can solve for v:

[tex]v = sqrt(2K/m)[/tex]

Plugging in the values given in the problem, we get:

[tex]v = sqrt(2*109 J / 0.145 kg) = 14.4 m/s[/tex]

Therefore, the speed of the basketball is 14.4 m/s if its kinetic energy is 109 J.

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The power output is given 2000 watt and voltage is 240 v. Then the current through the heating element is 8.3 A and the resistance is 29 ohms.

The power used by an object is the rate of its work done or energy. It is the energy divided by time. The power output in a circuit is the product of the potential difference V and current I.

P = I V

Given,

P = 2 kw = 2000 W

v = 240 V.

Then I = P/v

I = 2000 w/240 v = 8.3 A.

According to Ohm's law, voltage v is the product of the current and resistance through the material.

hence,

V = I R

then, R = V/I

R = 240 V/8.33 A

  = 29 Ω.

Therefore, the current and resistance through the heating element are 8.3 A and 29 ohms respectively.

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A spherical raindrop would fall from a height of 2.70 km at a speed of 26.22 m/s due to air resistance.

(a) Height from which the raindrop falls, h = 2.70 km = 2700 m

Now,

suppose, m = mass of raindrop

v = speed of raindrop at the ground.

Apply conservation of energy -

1/2 m v^2 = m g h

v = (2 g h)^1/2

  = (2 * 9.8 * 2700)^1/2 = 230.0 m/s (Answer)

Dynamics

m x" = m g - k x'^2

limit speed is

v = (m g / k)^1/2

where

k = 1/2 ρ A C

ρ = air density = 1.21 kg/m^3

A = area = π r^2 = 3.141 * 0.0015^2 = 7.07 x 10^-6 m^2

C = coefficient of hydraulic resistance [0.47 for a sphere]

m = ρ' V = 1.0 x 10^3 x (4/3)*pi*0.0015^3 = 1.41 x 10^-5 kg

k = 1/2*1.21*7.07x10^-6*0.47

  = 2.01 x 10^-7 kg/m

Therefore,

v = [(1.41 x 10^-5 x 9.8) / (2.01 x 10^-7)]^1/2

  = 26.22 m/s

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A 4 kilogram lawn chair that is blown into a fence by the wind experiences an 8 N reaction force from the fence.

Physics defines force as: The pushing or pulling of a massed object affects its velocity. An agent with the ability to change a body's resting and moving condition is known as an external force. It has a size and a movement.

Force: Force is indeed a physical factor that alters or has the potential to alter an object's state of rest and motion as well as its shape. Newton is the SI unit of force.

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To calculate the total work done on the block by all forces as it moves a distance "l" up the incline, we need to consider the work done by each force separately.

Assuming that the block is moving up the incline with a constant velocity, the net force on the block is zero. Therefore, the work done by the net force on the block is also zero.

However, there are two forces acting on the block: the force of gravity (Fg) and the force of friction (Ff). Since the block is moving up the incline, the direction of the frictional force is opposite to the direction of the displacement of the block, so the work done by the force of friction is negative.

The work done by the force of gravity is given by:

Wg = Fg * d

where Fg is the force of gravity acting on the block and d is the distance moved by the block in the direction of the force of gravity. Since the block is moving up the incline, the distance moved by the block in the direction of the force of gravity is l sinθ, where θ is the angle of inclination of the incline.

The work done by the force of friction is given by:

Wf = Ff * d

where Ff is the force of friction acting on the block and d is the distance moved by the block in the direction of the force of friction. Since the block is moving up the incline, the distance moved by the block in the direction of the force of friction is also l sinθ.

Since the force of friction is opposing the motion of the block, the work done by it is negative:

Wf = -μk * N * l sinθ

where μk is the coefficient of kinetic friction, N is the normal force exerted on the block by the incline and l sinθ is the distance moved by the block in the direction of the force of friction.

Therefore, the total work done on the block by all forces as it moves a distance "l" up the incline is:

Wtot = Wg + Wf

= Fg * l sinθ - μk * N * l sinθ

= (m * g * sinθ) * l sinθ - μk * (m * g * cosθ) * l sinθ

= (m * g * sinθ - μk * m * g * cosθ) * l sinθ

where m is the mass of the block, g is the acceleration due to gravity.

So, the total work done on the block by all forces as it moves a distance "l" up the incline is (m * g * sinθ - μk * m * g * cosθ) * l sinθ.

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The average force the bat exerts on the ball is -5200 N. This can be calculated using the equation F = Δp/Δt, where F is the average force, Δp is the change in momentum (pf-pi), and Δt is the time interval. In this case, Δp = m * (vf - vi) = 0.14 kg * (44 m/s - 30 m/s) = 5.4 kgm/s, and Δt = 0.002 s. Thus, F = 5.4 kgm/s / 0.002 s = -5200 N.

The atomic number of the atoms is 3

The mass number of the atom is 6.

The atomic number of an atom is the number of protons in the nucleus of the atom. In a neutral atom, the atomic number also corresponds to the number of electrons orbiting around the nucleus.

The atomic number determines the identity of the element, since each element has a unique number of protons in its nucleus.

The atomic number is typically represented by the symbol Z in chemical equations and atomic models.

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Answer:

Through the water cycle, heat is exchanged and temperatures fluctuate. As water evaporates, for example, it absorbs energy and cools the local environment. As water condenses, it releases energy and warms the local environment. The water cycle also influences the physical geography of the Earth.

The total equivalent resistance for the circuit is 35.89 Ω

First, we shall determine the equivalence resistance between 30 Ω and 40 Ω. Details below:

R = (R₁ × R₂) / (R₁ + R₂)

R = (30 × 40) / (30 + 40)

R = 17.14 Ω

Next, we shall determine the equivalence resistance between 20 Ω and 10 Ω. Details below:

R = R₁ + R₂

R = 20 + 10

R = 30 Ω

Next, we shall determine the equivalence resistance between 50 Ω and the equivalence of 20 Ω and 10 Ω (i.e 30 Ω). Details below:

R = (R₁ × R₂) / (R₁ + R₂)

R = (50 × 30) / (50 + 30)

R = 18.75 Ω

Finally, we shall determine the total equivalent resistance for the circuit. Details below:

Total equivalent resistance = 17.14 + 18.75

Total equivalent resistance = 35.89 Ω

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The electric current is of two types, direct current and alternating current. Direct current do not change its direction and amperage with time whereas alternating current change with time.

Direct current (DC) is an electric current which is uni-directional, and so the flow of charge is always in the same direction. As opposed to the alternating current, the direction and amperage of direct currents do not change with time. Direct current is used in many household electronics and in all the devices which use batteries.

Alternating current is an electric current which periodically reverses its direction and change its magnitude continuously with the time in contrast to direct current, which flows only in one direction. The current produced by the generators or turbines is the AC current, as it is the current which is obtained from our home power sockets.

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Time taken to incident light perpendicular to glass to pass through this 9.1 cm thick sandwich is 0.399 ns.

Being aware of

Layer thickness / light speed equals the amount of time required.

Also,

V is equal to the product of the sound speed and the refractive index.

Now

T1 = 0.05*1.46/3*10^8 = 2.43*10^-10 s

t2 = 0.01*1.5/3*10^8 = 5*10^-11 s

t3 = 0.02*1.59/3*10^8 = 1.06*10^-10 s

So,

Total time is equal to 2.43*10-10, 5*10-11, and 1.06*10-10 s, or 0.399*10-9 s.

= 0.399 ns

When a light beam passes through a certain media, its speed in that medium may be determined using the light speed in vacuum and the medium's refractive index. With the use of the medium's light speed, the value of the amount of time needed to travel a particular distance can be determined.

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The object with the least kinetic energy, given the above instances is water with a mass of 12 Kg falling at 10 m/s (option B)

To know the object which has the least kinetic energy, we shall determine the kinetic energy of each objects. This is illustrated below:

For sand (Option A):

KE = ½mv²

KE = ½ × 120 × 12²

KE = 8640 J

For water (Option B):

KE = ½mv²

KE = ½ × 12 × 10²

KE = 60 J

For sand (Option C):

KE = ½mv²

KE = ½ × 12 × 8²

KE = 384 J

For water (Option D):

KE = ½mv²

KE = ½ × 120 × 12²

KE = 8640 J

From the above calculations, it is evident that the water with a mass of 12 Kg falling at 10 m/s has the least kinetic energy. Thus, the correct answer is option B

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The vertical force is given as 735.75 N

Given that there is no friction existing between the wall and the ladder, we would have

w - n = 0

w is the weight of thios ladder

while N is the vertical force that acts on it

n = w

the formula for n = mg

this is mass of ladder * the gravitational constant

= 75.0 kg ladder * 9.81

= 735.75 N

written as substituting the weight of the ladder, W = 75.0 kg * 9.81 m/s^2 = 735.75 N

Therefore the vertical force is givem as 735.75 N

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The electrical force between two charged objects decreases as the distance between them increases. This means that as the distance between two positively charged pith balls increases, the electrical force between them decreases. Therefore, the electrical charge on each pith ball is not affected by the distance between them. The charge on each pith ball will remain the same regardless of the distance between them. However, the electrical force between the pith balls will be weaker at greater distances, and stronger at smaller distances.

Answer:

i'm pretty sure what the other guy means is:

The greater the distance between the pith balls, the lesser the amount of electric charge that exists between them.

Explanation:

"This means that as the distance between two positively charged pith balls increases, the electrical force between them decreases"

The centripetal force pulling the weight inward is 19.7 N. The closest option to this value is option (D), 19.7 N.

What is Centripetal Force?

Centripetal force is a force that acts on an object moving in a circular path, directing it toward the center of the circle. In other words, it is the force required to keep an object moving in a circular path, rather than flying off in a straight line. The word "centripetal" comes from the Latin words "centrum", which means "center", and "petere", which means "to seek or aim for".

The centripetal force, which is the force acting on an object moving in a circular path, is given by the formula:

F = m * v^2 / r

where F is the centripetal force, m is the mass of the object, v is its velocity, and r is the radius of the circular path.

In this case, the mass of the weight is 770 g, or 0.77 kg, the velocity is 4.24 m/s, and the radius is 0.94 m.

F = (0.77 kg) * (4.24 m/s)^2 / 0.94 m

F = 19.7 N

Therefore, the centripetal force pulling the weight inward is 19.7 N. The closest option to this value is option (D), 19.7 N.V

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To produce a force of 12 kN in the press, a tangential turning force of 1187500 N (1187.5 kN) must be applied to the wheel.

Force is an influence that causes a change in the motion, shape, or both of an object. It is the result of an interaction between two objects, and is described through Newton's three laws of motion. These laws explain the relationship between force, mass, and acceleration.

The pitch of the screw is the distance between two adjacent threads on the screw, and is 0.20 cm in this case. The wheel diameter is 55 cm.

To calculate the force needed to produce a force of 12 kN in the press, we use the following equation: F = (12000 N * 55 cm) / (0.20 cm * 0.4).

This equation takes into account the pitch of the screw, the wheel diameter, and the efficiency of the press.

Plugging in the numbers, we get: F = (12000 N * 55 cm) / (0.20 cm * 0.4) = 1187500 N.

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The horizontal displacement is given by the product of the horizontal component of the initial velocity and the time of flight, so it is 6 m/s x 0.828 s = 4.968 m.

Initial velocity is the speed of an object at the start of its motion. It is usually represented by the letter u in equations. Initial velocity is important in determining the final velocity, displacement, and acceleration of an object after a certain amount of time.

The horizontal displacement is simply the product of the horizontal component of the initial velocity, 6 m/s, and the time the ball is in the air. To determine the time the ball stays in the air, we can use the formula for the time of flight of an object under the influence of gravity:
t = 2v sin θ / g
Where t is the time of flight, v is the initial velocity, θ is the angle of the initial velocity vector with respect to the horizontal, and g is the acceleration due to gravity (9.8 m/s2).
In this case, the initial velocity vector is (6.0 m/s) x + (20.0 m/s) y, so the angle is given by the inverse tangent of the ratio of the y-component to the x-component, which is inverse tangent (20.0/6.0) = 77.4°.
Substituting the values into the equation, we get:
t = 2 (6.0 m/s) sin 77.4° / 9.8 m/s2 = 0.828 s
The horizontal displacement is given by the product of the horizontal component of the initial velocity and the time of flight, so it is 6 m/s x 0.828 s = 4.968 m.

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Cardiovascular fitness and flexibility are both important factors in maintaining a healthy lifestyle because they contribute to overall physical health and well-being.

Cardiovascular fitness refers to the ability of the heart, lungs, and circulatory system to deliver oxygen-rich blood to the body's tissues during physical activity. Regular cardiovascular exercise, such as running, swimming, or cycling, can improve heart health, lower blood pressure, reduce the risk of heart disease, and improve overall fitness and endurance.

In combination, cardiovascular fitness and flexibility can provide a foundation for good physical health, allowing individuals to engage in a wide range of physical activities and enjoy an active lifestyle. Regular exercise that includes both cardiovascular fitness and flexibility can also help improve mental health and reduce the risk of chronic diseases, such as obesity, type 2 diabetes, and some forms of cancer. Overall, maintaining good cardiovascular fitness and flexibility is an important part of a healthy lifestyle.

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Answer:

To solve this problem, we will use the equation for the net force on an object, which is:

net force = mass x acceleration

We can rearrange this equation to solve for acceleration:

acceleration = net force / mass

Once we have the acceleration, we can use the equation for the motion of an object under constant acceleration:

final velocity^2 = initial velocity^2 + 2 x acceleration x distance

We can rearrange this equation to solve for the distance required to stop the car:

distance = initial velocity^2 / (2 x acceleration)

Finally, we can use the equation for average velocity to calculate the time required to travel this distance:

time = distance / average velocity

Substituting the given values into the equations:

net force = 6000 N

mass = 1200 kg

initial velocity = 10 m/s

Using the first equation:

acceleration = net force / mass

acceleration = 6000 N / 1200 kg

acceleration = 5 m/s^2

Using the second equation:

distance = initial velocity^2 / (2 x acceleration)

distance = 10 m/s^2 / (2 x 5 m/s^2)

distance = 10 m

Using the third equation:

average velocity = (initial velocity + final velocity) / 2

final velocity = 0 (since the car is coming to a stop)

average velocity = 10 m/s / 2

average velocity = 5 m/s

Using the fourth equation:

time = distance / average velocity

time = 10 m / 5 m/s

time = 2 seconds

Therefore, the time required for a 6000-newton net force to stop a 1200-kilogram car initially traveling at 10 meters per second is 2 seconds.

No, she is not correct. The density of the larger rock may be different than the density of her piece, depending on the composition of the rock and how it was formed.

Density is the measure of the mass of a substance per unit of volume. It is a physical property of a substance that can be used to identify the material. Density is calculated by dividing the mass of an object by its volume. Density is an intensive property, meaning it is independent of the size of the sample. The SI unit of density is kilograms per meter cubed (kg/m^3). Different materials have different densities, which can be compared to each other. For example, the density of water is 1 g/cm^3, while the density of lead is 11.3 g/cm^3. Density is an important physical property that is used in many scientific fields, such as physics and chemistry.

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Soft sand makes it challenging to ride a bicycle since the tires can't generate enough friction. The bicycle struggles to move ahead as a result, and its tires sink.

Riding a bicycle on soft sand poses a risk of the vehicle being stuck and challenging to move. Injuries might result if the rider loses balance and falls off the bicycle. The frame, tires, and other parts of the bicycle could also be harmed by the sand.

Furthermore, sand, dirt, wood chips, deep pea gravel, soft grass, and snow all drastically alter your speed. Sand, however, can be the most challenging of all of them because you typically enter the area quickly from grass or another hard surface.

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Answer:

Explanation:

Amplitude of first wave a1=4

Amplitude of second wave a2=3

Angle between two waves =Π/2

Resultant amplitude=[tex]\sqrt{a_{1} ^{2}+a_{2} ^{2} +2a_{1} a_{2} cos\alpha }[/tex]

=[tex]\sqrt{4^{2}+3^{2} +2*4*3*cos90 }[/tex]

=5

Answer is a

Answer:

7.75 m/s.

Explanation:

We can use the work-energy principle to solve this problem. The principle states that the work done on an object is equal to the change in its kinetic energy:

W = ΔK

where W is the work done, ΔK is the change in kinetic energy.

In this case, the work done on the ball is 45.0 J. Since the ball is initially at rest, its initial kinetic energy is zero. Therefore, the change in kinetic energy is:

ΔK = Kf - Ki = 1/2 mv^2 - 0

where Kf is the final kinetic energy, Ki is the initial kinetic energy, m is the mass of the ball, and v is its velocity.

Substituting the given values, we get:

45.0 J = 1/2 (1.50 kg) v^2

Solving for v, we get:

v^2 = (2 x 45.0 J) / (1.50 kg)

v^2 = 60.0

v = √60.0

v ≈ 7.75 m/s

Therefore, the velocity of the ball is approximately 7.75 m/s.

Answer:

Water is denser so a liter of water weighs more than a liter of ice