A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock’s gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec., at the bottom of the cliff the rock’s potential energy is completely converted to kinetic energy. Use the formula for kinetic energy to calculate the rock’s speed at the bottom of the cliff. Show all calculations.

Answers

Answer 1

Answer: Lets see:-

We have our formula for potential energy, which we are trying to solve for,

PE = mgh or potential energy = mass * gravity * height

So we know that PE all depends on these.

Height : 30 meters
Mass : 25 kg
Gravity (which is always constant) : 9.8 m/s/s

Now add into formula.

PE = 25*30*9.8
PE = 7350 Joules

Answer: PE = 7350 Joules

Now calculate speed:-

7,350 joules/12.5 kg = speed-squared
588 m²/s² = speed-squared
about 24.248 m/s

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Answers

Answer:

The correct answer is "Infrared light".

Explanation:

Infrared light, also known as infrared radiation, is a type of light that can no be seen but it can be felt from the heat that it generates. The spectrum of wavelengths that comprise the infrared light is given from 700 nanometers, which is the edge of visible red light, up to 1 millimeter of wavelength. Near-Infrared light is the one that can reach the highest temperature, reaching from 3000 to 5200 K. Therefore, a super-powerful flashlight heated up to 3600 K can be given off infrared light.

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Answers

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Btw i donno why but i feel like we study in the same school like the u have are so similar ......

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Answers

The chemical changes that occur as a car ages are fading of paint due to sunlight. rusting on the chrome, corrosion of electrical wiring. Some physical changes that occur as a car ages are breaking of the handles and straps, wearing down of tyre, paint scratches.

A chemical change is one which brings change in the composition of the substance. In other words, it is such a change which forms a completely new substance or product. It is an irreversible change.

On the other hand, a physical change is one which brings structural change or change in appearance of a substance without changing its original composition. It is a reversible change.

To know more about chemical change here

brainly.com/question/23693316

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Answer:physical: a part falling off or changing a tire. chemical:rust

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Answers

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Answers

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