(a) What is the kinetic energy in joules of a 1140-kg automobile traveling at 93 km/h? (b) How much work would have to be done to bring a 1140-kg automobile traveling at 93 km/h to a stop?

4.

How much work is required to lift a 6.4-kg backpack 1.3 m to put it on?

7.

A student who weighs 553 N climbs a stairway (vertical height of 4.0 m) in 25 s. (a) How much work is done?

(b) What is the power output of the student?

8.

A worker pushes horizontally on a large crate with a force of 295 N, and the crate is moved 3.5 m. How much work was done?

10.

Which has more kinetic energy: a0.0013-kg bullet traveling at401m/sor a7.810⁷-kgocean liner traveling at10m/s(19knots)? the bullet has greater kinetic energythe ocean liner has greater kinetic energy Justify your answer.

Ek-bullet	=	J
Ek-ocean liner	=	J

13.

A 0.20-kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 6.0 N for a distance of 4.5 m. How much kinetic energy does the block gain?

In a burst, a cyclist can exert 588 W of power for 7.50 seconds. What is the work output (in J) of the cyclist?

16. While rearranging a dorm room, a student does 389 J of work in moving a desk 3.0 m. What was the magnitude of the applied horizontal force (in N)?

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