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$\cdot$ $\cdot$ Animal energy. Adult cheetahs, the fastest of the greatcats, have a mass of about 70 $\mathrm{kg}$ and have been clocked at upto 72 mph $(32 \mathrm{m} / \mathrm{s})$ . (a) How many joules of kinetic energydoes such a swift cheetah have? (b) By what factor would itskinetic energy change if its speed were doubled?

a) $3.584 \times 10^{4} \mathrm{J}$b) The kinetic energy increases by 4 times.

Physics 101 Mechanics

Chapter 7

Work and Energ

Physics Basics

Applying Newton's Laws

Kinetic Energy

Potential Energy

Energy Conservation

Cornell University

University of Michigan - Ann Arbor

University of Washington

University of Sheffield

Lectures

04:16

In mathematics, a proof is…

04:48

In mathematics, algebra is…

02:37

Animal Energy. BIO Adult c…

01:37

Adult cheetahs, the fastes…

01:41

A 62.0 -kg cheetah acceler…

03:56

(a) How fast must a 3000-k…

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$\cdot$ $\cdot$ If a runni…

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Animal dynamics. An adult …

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An 8.0-g bullet has a spee…

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Calculate the kinetic ener…

02:58

Animal motion. Cheetahs, t…

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A 3.2 kg sloth hangs 3.0 m…

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($a$) A 3.0-g locust reach…

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A 5.0 -kg rabbit and a 12 …

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Determine the total energy…

01:15

00:40

A cheetah can accelerate f…

00:46

so we know that the kinetic energy is half off. And these Clarence Now we're given the mass of the cheetah, which is 70 kilograms on the velocity is 32 meters for second. From there we can solve for the candidate energy which will be half times the mask to 70 kilograms times the velocity villages, 32 meters per second squared. That gives us a kind of energy off its key. So that gives us a kind of energy off 3.6 times into the power for Jules and in Part VII, we see that if we keep the mass constant, we see that key or the kind of the energy is proportional to V squared. So that means if we double the velocity or candidate, energy will be increased by a factor of four. So what? I mean, here is Let's say I mean, let's say I made the new velocity be one as twice off the and the new clinic energies kill one. So Ki over key one will be fi squared over to re squared R to the hold squared. From there, we see that K one over Kay is equal to So we can get it off this on this one. So we see that this is for so that means key One is four times the kind of energy. Thank you.

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