3. Someone at the third-floor window (12.0 m above the ground) hurls a ball downward at an angle of 45 degrees with a speed of 25 m/s. How fast will the ball be traveling when it strikes the sidewalk below?

The tension developed in cable AB for the equilibrium of the 440-lb crate is approximately 1606 lb (to two significant figures). The units are pounds (lb).

To determine the tension developed in cable AB for the equilibrium of the 440-lb crate, we need to use the principle of equilibrium, which states that the net force acting on an object is zero.

Vertical component:

W = 440 lb

Tsin30 = (T/2) lb (since sin30 = 1/2)

Horizontal component:

Tcos30 = (0.866T) lb (since cos30 = √3/2 ≈ 0.866)

Since the crate is in equilibrium, the net force in the vertical direction must be zero. Therefore,

Tsin30 = W

(T/2) = 440 lb

T = 2 × 440 lb / sin30

T ≈ 1606 lb

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Answer:

the future of c DC and hi to mere ko pahchani pahchani pahchani pahchani pahchani pahchani pahchani pahchani pahchani the future of c DC and hi

Explanation:

v I will be in the future of c DC and hi to everyone who has a few days ago I will be in the future of c DC and hi to everyone and their children of God I will be in the future of c DC and hi to everyone who has a few days ago I will be in the future of c DC and their families of the attached document and their families will get back from try to the the future can vsnydb behind f

Answer:

hi

Explanation:

there is the answer

hope it helps

good luck

Answer:

When you squeeze a bottle that has a balloon attached to its opening, the pressure inside the bottle increases. This increased pressure will cause the air molecules inside the bottle to move closer together, which in turn will cause the balloon to inflate.

If you continue to squeeze the bottle, the pressure inside the bottle will continue to increase, and the balloon will continue to inflate. However, if you squeeze the bottle too hard, the balloon may burst due to the excess pressure.

When you release the pressure on the bottle, the air molecules inside the bottle will spread out again, causing the pressure to decrease. As a result, the balloon will deflate back to its original size.

Answer: Unequal heating rates of land and water

Explanation: During the day the land heats up faster, the warm air over the land rises up and the cold air from the sea blows towards the land causing a sea breeze.

Answer:

The answer is definitely A

The coefficient of surface tension of water is 29400 N/m and the coefficient of surface tension for the mercury in the capillary tube is 159412.5 N/m.

The surface tension of a liquid is the force on its surface caused by the particle - particle attraction in the surface layer by the bulk of the liquid which results in the minimization of surface area.

The equation connecting the coefficient of surface tension with radius of capillary, height and density is given as :

γ = ρ g h/2r

For water ,

ρ = 1000 kg/m³

h = 12 cm = 0.12 m

r = 2 cm = 0.02 m.

then γ =  1000 kg/m³ × 9.8 m/s² × 0.12 m/ (2 × 0.02 m)

           =  29400 N/m.

For mercury,

ρ = 13000 kg/m³

h = 5 cm = 0.05m

r = 2 cm = 0.02 m.

then γ =  13000 kg/m³ × 9.8 m/s² × 0.05 m/ (2 × 0.02 m)

           = 159412.5 N/m.

Therefore, the  coefficient of surface tension of water is 29400 N/m and the coefficient of surface tension for the mercury in the capillary tube is 159412.5 N/m.

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1) The wavelength of the sound wave is 11cm.

2) The frequency of the sound wave is 3118.18.

3) The length of the air column is 35.75cm.

What is frequency and its unit?

The quantity of full oscillations made by any wave element in a unit of time is known as the frequency of a sinusoidal wave. A parameter that describes the rate of oscillation and vibration is called frequency. Hertz is the SI unit for frequency. One full oscillation per second corresponds to one hertz (Hz).

Therefore, The wavelength of the sound wave is 11cm, The frequency of the sound wave is 3118.18 and The length of the air column is 35.75c

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Plastics are made of synthetic polymers that are non-deforming when bent or compressed, making them useful for forming into various shapes.

Synthetic polymers are derived from petroleum oil, and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based.Synthetic polymers are sometimes referred to as “plastics”, of which the well-known ones are nylon and polyethylene. The polymers which are formed by linking monomer units, without any change of material, are known as addition polymers or also called chain-growth polymers.

Synthetic polymers are lightweight, hard to break, and last a long time. They are quite cheap to make and easy to form into shapes. One of the most common and versatile polymers is polyethylene. It is made from ethylene (also known as ethene) monomers.

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Ann's speed with sandbags is 400 meters in 5 minutes, or an average of 80 meters per minute.

In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.Speed is defined as. The rate of change of position of an object in any direction. Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude.There are four types of speed which are uniform speed, variable speed, average speed, and instantaneous speed.

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Answer: false

Explanation: This is false the tempature of -272 celcius in 1 kelvin.

Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to decrease in strength

The strength of the magnetic field produced by an electromagnet decreases as the distance from the electromagnet increases. This means that if the distance between the electromagnet and the compass increases, the magnetic field that the compass is experiencing will weaken.

As a result, the observed effect of the compass will decrease in strength as the distance between the electromagnet and the compass increases.

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The internal energy of the system how the evaporation of sweet cools down the body of the athlete after exercising are mentioned below.

What is evaporation ?

The water cycle's crucial step is evaporation. When a liquid transforms into a gas, evaporation takes place. As rain puddles "disappear" on a hot day or when wet clothing dries in the sun, it is simple to envision. The liquid water in these instances is evaporating into a gas known as water vapor rather than actually dissipating.

What is energy?

Examples and Definitions of Energy (Science) The capacity to work comes from energy. Energy types include chemical, nuclear, and electrical energy. Science and engineering both depend on the idea of energy. Here is a look at the classification of energy as well as its description and examples.

Therefore, The internal energy of the system how the evaporation of sweet cools down the body of the athlete after exercising are mentioned above.

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Answer:

The reason is that for the options above, bacteria can only grow most rapidly in the range of temperatures between ~ 40 °F and 140 °F and the reason foods like those have to be refrigerated is because meat can go rot pretty easily and there could have a lot of bacteria and things we do not want at all. But put meat in the fridge can slow down bacterial growth.

Explanation:

Well the answer toy your question is that, counter foods such as:

( The only things that are on my counter RIGHT now is the shown above.

The reason is that for the options above, bacteria can only grow most rapidly in the range of temperatures between ~ 40 °F and 140 °F

So that is why some foods like fruits can stay out.

The reason why foods like:

The reason foods like those have to be refrigerated is because meat can go rot pretty easily and there could have a lot of bacteria and things we do not want at all. But put meat in the fridge can slow down bacterial growth.

Thus the answer to your problem is:

The reason foods like those have to be refrigerated is because meat can go rot pretty easily and there could have a lot of bacteria and things we do not want at all. But put meat in the fridge can slow down bacterial growth.

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The average power developed by the boy during the climb is approximately 29.4 W.

In physics, the amount of energy transferred or converted per unit time is called power.

total height = number of steps x height of each step

total height = 30 x 0.15 m = 4.5 m

Given, time = 60 s

As power = work done / time

work done = force x distance

force = mass x gravity

mass is boy's mass (40 kg) and gravity is acceleration due to gravity (9.81 m/s²).

force = 40 kg x 9.81 m/s² = 392.4 N

The distance that the boy moves is equal to the total height that he has climbed: distance = total height = 4.5 m

work done = force x distance

work done = 392.4 N x 4.5 m = 1765.8 J

power = work done / time

power = 1765.8 J / 60 s

power ≈ 29.4 W

Therefore, the average power developed by the boy during the climb is approximately 29.4 W.

As for the anomalous behavior of water, water has a higher boiling point and melting point as compared to other substances with similar molecular weight. This is due to the strong hydrogen bonding between water molecules, which requires more energy to break the bonds and change the state of water from solid to liquid to gas.

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The electric bill for the household for the month of June is ₹ 504.72

We'll begin by obtaining the energy consumed. This is shown below:

For fridge:

Energy = power × time

Energy for fridge = 400 × 10

Energy for fridge = 4000 Wh

Divide by 1000 to express in KWh

Energy for fridge = 4000 / 1000

Energy for fridge = 4 kWh

For fan:

Energy = power × time

Energy for fan = 80 × 6

Energy for fan = 480 Wh

Divide by 1000 to express in KWh

Energy for fan = 480 / 1000

Energy for fan = 0.48 kWh

Energy for 2 fans = 2 × 0.48 = 0.96 kWh

For tube:

Energy = power × time

Energy for tube = 18 × 6

Energy for tube = 108 Wh

Divide by 1000 to express in KWh

Energy for tube = 108 / 1000

Energy for tube = 0.108 kWh

Energy for 6 tubes = 6 × 0.108 = 0.648 kWh

Total energy consumed per day = 4 + 0.96 + 0.648 = 5.608 kWh

Total energy consumed per month = 30 × 5.608 = 168.24 kWh

Finally, we shall determine the electric bill for the month of june. Details below:

Electric bill = energy × Cost per KWh

Electric bill for June= 168.24 × 3

Electric bill for June = ₹ 504.72

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the answer I got was 6000Hz

Answer:

Explanation:

Given :

We need to find the frequency of the wave

Using formula:

Where,

On substituting the required values, we get:

[tex] \dashrightarrow \sf \: F = \dfrac{80}{0.3} \\ \\ \dashrightarrow \sf \: F = 266.6 \: Hz[/tex]

Therefore,

Answer:

Density of iron = 7.87 g/cm^3

Explanation:

Answer:

a. time of flight = 4.285 s

b. horizontal distance reached = 214.25m

c. final velocity = 65.3m/s, at 40° downwards

Explanation:

This is a projectile motion question.

Things to note, in all projectile motion questions:

In projectile motion questions, we will use the three equations of motion:

[tex]v=u+at\\v^2=u^2+2as\\s=ut+\frac{1}{2}at^2[/tex]

Thus we can adjust our equations for the x - component:

[tex]v=u\\s=ut[/tex], since acceleration = 0

For the y - component:

[tex]v=u-gt\\v^2=u^2-2gs\\s=ut-\frac{1}{2}gt^2[/tex], since acceleration = gravity (9.8 m/s²), downwards.

Now, with our question, we can note: u(x) = 50m/s, and u(y) = 0, since, initially, only horizontal motion. Also, s(y) = - 90m.

(a) After how many seconds will it strike the plain at the foot of the cliff?

In this question, we are asked to find time of flight, 't'. As we have s(y), u(y), and g, we can use the third equation, [tex]s=ut-\frac{1}{2}gt^2[/tex] to find t.

Since u=0, thus, - 90 = -1/2×9.8×t². solving this algebraically, therefore, time of flight = 4.285 s.

(b) At what distance from the foot of the cliff will it strike?

Now, we need to find the horizontal distance or range. All we can use to do this is s = ut. Since we know that u=50m/s, and t=4.285s, this will be easy. s = (50)(4.285) = 214.25 m.

Therefore, horizontal distance reached = 214.25m.

(c) With what velocity will it strike the ground?

In this part, we need to find final velocity. Final velocity = the resultant vector of both the x and y velocity components. [tex]v=\sqrt{(v_x)^2+(v_y)^2}[/tex].

Since horizontal velocity is constant, u = v, and therefore, v(x) = 50m/s.

For vertical velocity, we can use [tex]v^2=u^2-2gs[/tex]. u(x) = 0, and s(y) = -90m.

Therefore, v² = -2(9.8)(-90). final vertical velocity is thus 42m/s.

Now final velocity = √(50² + 42²) ≈ 65.3 m/s.

Lastly, we need to remember to calculate direction, since velocity is a vector quantity. the direction of velocity (θ) [tex]=tan^{-1}(\frac{v_y}{v_x})[/tex]

Therefore, θ = 40°.

Therefore, final velocity = 65.3m/s, at 40° downwards.

The two hockey players move off together at a common velocity of 7 m/s after the collision.

What is principle of conservation of momentum?

We can apply the momentum conservation concept to resolve this issue. This rule states that a closed system's total momentum is conserved both before and after a collision.

The product of an object's mass and velocity determines its momentum. As a result, we can determine each hockey player's momentum prior to the contact using the formulas below:

The total momentum of the system before the collision is the sum of these individual momenta:

           p_total = p1 + p2 = 420 kg m/s + 560 kg m/s = 980 kg m/s

The two hockey players fall off together after the collision. After the collision, their velocities are unknown to us, but we do know that their total momentum is still preserved. Hence, we can write:

                     p_total = (m1 + m2) * v_total

where v_total is the common velocity of the two hockey players after the collision. We can rearrange this equation to solve for v_total:

v_total = p_total / (m1 + m2)

= 980 kg m/s / (70 kg + 70 kg)

= 7 m/s

Therefore, the two hockey players move off together at a common velocity of 7 m/s after the collision.

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Sound waves are emitted from the surface of the ocean and travel through the water at 1490 m/s, with a wavelength of 15m. The frequency of the sound waves as they travel to the bottom of the ocean is 99.33Hz.

The pattern of disruption brought on by energy moving away from the sound source is known as a sound wave. Longitudinal waves are those produced by sound. This indicates that the direction of energy wave propagation and the particle vibrational propagation are parallel. The atoms oscillate when they are put into vibration. A high-pressure and a low-pressure zone are created in the medium as a result of this constant back and forth action. Compressions and rarefactions, respectively, are terms used to describe these high- and low-pressure zones. The sound waves go from one medium to another as a result of these regions being transmitted to the surrounding media.

Using the formula:

v = n×λ

where,

v is the velocity of sound wave and,

λ is the wavelength.

Substituting the values and solving for frequency:

n = 99.33Hz

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In Maths finding the square root of a number is the opposite of squaring a number. The square root of the square of a positive number gives the original number. The Square root of 2.56 is 1.6.

The square root of a number can be defined as the factor which we can multiply by itself to get that number. The symbol used to represent the square root is √.

The square root of any number can be found out without using calculator by using long division method. Here the square root of 2.56 is 1.6. Divide, multiply, subtract, bring the next number and repeat. These are the steps of it.

√2.56 = 1.6

The long division method of 2.56 is attached here.

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The parameter that is consistent with the indicated change in momentum is:

First we can use the principle of conservation of momentum to determine which of the following parameters are consistent with the indicated change in momentum:

p = m * v

Where

If the momentum of the object increases from 5 kg·m/s to 25 kg·m/s in the same direction, then we can conclude that:

Therefore, the parameter that is consistent with the indicated change in momentum is:

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Explanation:

If both charges are positive, the force will be positive; similarly, if both charges are negative, the force will be positive.

If one charge is positive and another is negative, the force will be negative.

The correct answer is "positive; negative". According to Coulomb's Law, the force between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. The force is attractive if the charges are of opposite sign (one positive and one negative), and repulsive if the charges are of the same sign (both positive or both negative). Therefore, when one charge is positive and another is negative, the force between them is attractive, while when both charges are positive or both are negative, the force between them is repulsive.

The electrostatic force between the two charges will decrease in magnitude and become attractive.

What is Electrostatic Force?

Electrostatic force, also known as Coulombic force or Coulomb's law, is the force that exists between electrically charged particles, such as protons and electrons. The force is exerted by one charged particle on another and can be attractive or repulsive, depending on the types of charges involved.

The magnitude of the electrostatic force is directly proportional to the product of the charges on the particles and inversely proportional to the square of the distance between them. Mathematically, this can be expressed as F = k(q1q2)/r^2, where F is the electrostatic force, q1 and q2 are the charges on the particles, r is the distance between them, and k is the Coulomb constant.

If one of the like charges becomes oppositely charged, the electrostatic force between them will become attractive. .

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Vector diagram B will result in the largest resultant vector. Correct option is B.

Vector is a mathematical quantity which has both magnitude as well as direction. Force, displacement, velocity & acceleration etc. are the examples of vectors. Vectors are denoted by a standard letter and an arrow upon it.

The resultant(R) of two vectors R1 and R2 having angle θ between them are given by,

R² = R₁² + R₂² + 2R₁R₂cosθ

A) in this diagram single vector is there,

so R = R₁

B) in this diagram two vectors are in same direction with zero angle between them. (Cos0 = 1)

R² = R₁² + R₂² + 2R₁R₂

C) & D) In these diagrams two vectors are in opposite direction with zero angle between them. (Cos180 = -1)

R² = R₁² + R₂² - 2R₁R₂

Looking at B Two vectors will be added each other and give largest resultant vector.

Hence Option B is correct.

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