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Chapter 9: 9.Q. 10 (page 227)

A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero? Explain

Short Answer

Expert verified

Work done on sprinter is negative

Step by step solution

01

Given information

A sprinter accelerates from rest.

02

Explanation

When sprinter accelerates, the work done on sprinters is due to normal reaction on sprinter.

As the sprinter takes off from ground, work done is calculated by the frictional force acting on when sprinter takes off foot from ground.

So ,the normal reaction on the sprinter is negative giving negative work done on the sprinter.

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Most popular questions from this chapter

One mole ( $6.02 \times 10^{23}$ atoms) of helium atoms in the gas phase has $3700$ J of microscopic kinetic energy at room temperature. If we assume that all atoms move with the same speed, what is that speed? The mass of a helium atom is $6.68 \times 10^{- 27}$ kg.

Evaluate the dot product of the three pairs of vectors in

Figure

a. Starting from rest, a crate of mass $m$ is pushed up a frictionless slope of angle $θ$ by a horizontal force of magnitude $F$ . Use work and energy to find an expression for the crate’s speed $v$ when it is at height $h$ above the bottom of the slope.

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A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero? Explain

See all solutions

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