A shot-putter accelerates a 7.30-kg shot from rest to $14.0 \mathrm{~m} / \mathrm{s}$. If this motion takes $2.00 \mathrm{~s}$, what average power was supplied?

A car of mass $m$ accelerates from rest along a level straight track, not at a constant acceleration but with constant engine power, $P$. Assume that air resistance is negligible. c) You are in a drag race, on a straight level track, with an opponent whose car maintains a constant acceleration of $12.0 \mathrm{~m} / \mathrm{s}^2$. Both cars have identical masses of 1000 . kg. The cars start together from rest. Air resistance is assumed to be negligible. Calculate the minimum power your engine needs for you to win the race, assuming the power output is constant and the distance to the finish line is $0.250 \mathrm{mi}$.

A car of mass $m$ accelerates from rest along a level straight track, not at a constant acceleration but with constant engine power, $P$. Assume that air resistance is negligible. b) A second car starts from rest alongside the first car on the same track, but maintains a constant acceleration. Which car takes the initial lead? Does the other car overtake it? If yes, write a formula for the distance from the starting point at which this happens.

A car of mass $m$ accelerates from rest along a level straight track, not at a constant acceleration but with constant engine power, $P$. Assume that air resistance is negligible. a) Find the car's velocity as a function of time.

A small blimp is used for advertising purposes at a football game. It has a mass of $93.5 \mathrm{~kg}$ and is attached by a towrope to a truck on the ground. The towrope makes an angle of $53.3^{\circ}$ downward from the horizontal, and the blimp hovers at a constant height of $19.5 \mathrm{~m}$ above the ground. The truck moves on a straight line for $840.5 \mathrm{~m}$ on the level surface of the stadium parking lot at a constant velocity of $8.90 \mathrm{~m} / \mathrm{s}$. If the drag coefficient $(K$ in $F=K v^2$ ) is $0.500 \mathrm{~kg} / \mathrm{m}$, how much work is done by the truck in pulling the blimp (assuming there is no wind)?

A car of mass $942.4 \mathrm{~kg}$ accelerates from rest with a constant power output of $140.5 \mathrm{hp}$. Neglecting air resistance, what is the speed of the car after $4.55 \mathrm{~s}$ ?

An engine expends $40.0 \mathrm{hp}$ in moving a car along a level track at a speed of $15.0 \mathrm{~m} / \mathrm{s}$. How large is the total force acting on the car in the direction opposite to the motion of the car?

Which of the following is a correct unit of power? a) $\mathrm{kg} \mathrm{m} / \mathrm{s}^2$, b) $\mathrm{N}$, c) $J$, d) $\mathrm{m} / \mathrm{s}^2$, e) $W$.

Is each of the following statements true or false? c) A force is required to do work.

Is each of the following statements true or false? b) More power is required to lift a box slowly than to lift a box quickly.

Is each of the following statements true or false? a) Work cannot be done in the absence of motion.

A car of mass 1214.5 kg is moving at a speed of 62.5 mph when it misses a curve in the road and hits a bridge piling. If the car comes to rest in 0.236 s, how much average power (in watts) is expended in this interval?

While a boat is being towed at a speed of $12.0 \mathrm{~m} / \mathrm{s}$, the tension in the towline is $6.00 \mathrm{kN}$. What is the power supplied to the boat through the towline?

A horse draws a sled horizontally across a snow-covered field. The coefficient of friction between the sled and the snow is $0.195$, and the mass of the sled, including the load, is $202.3 \mathrm{~kg}$. If the horse moves the sled at a constant speed of $1.785 \mathrm{~m} / \mathrm{s}$, what is the power needed to accomplish this?