Question

An 5-kg animal accelerates from rest to 10 m/s in 10 m and encounters an average drag force of 12 N. What is the average power output in Watts if this takes 2.0 seconds?

Answer #1

A 500-kg dragster accelerates from rest to a final speed of
110 m/s in 400 m (about a quarter of a mile) and encounters an
average frictional force of 1200 N. What is its average power
output in watts and horsepower if this takes 7.30 s?
In this question, the answer will lead to Energy=KE
final+ W friction
How is it + while friction will go to the oppisite side
of the path the dragster goes? Or is that an...

Animal "one" accelerates from rest to 18.0 mph in 11.4 s. Animal
"two" accelerates from rest to 5.6 mph in the same amount of
time.
By what factor is the average acceleration developed by animal
"one" greater than the average acceleration developed by animal
"two"?

A 1.50 ✕ 103-kg car starts from rest and accelerates
uniformly to 16.0 m/s in 12.9 s. Assume that air resistance remains
constant at 400 N during this time.
(a) Find the average power developed by the engine.
____ hp
(b) Find the instantaneous power output of the engine at t
= 12.9 s, just before the car stops accelerating.
______ hp

A 62 kg human sprinter can accelerate from rest to 11.3 m/s in
3.9 s . What is the average power output of the human in Watts?

A 66 kg human sprinter can accelerate from rest to 10 m/s in 2.7
s . During the same time interval, a 27 kg greyhound can go from
rest to 20 m/s.
What is the average power output of the human?

A 54 kg sprinter, starting from rest, runs 46 m in 7.0 s at
constant acceleration.
What is the magnitude of the horizontal force acting on the
sprinter?
What is the sprinter's power output at 2.0 s, 4.0 s, and 6.0
s?

A 53 kg sprinter, starting from rest, runs a 60 m long race in
7.5 s with a constant acceleration.
How much work does the sprinter do during the first 2.0 s of the
race?
What is the sprinter's average power output during the first 2.0
s of the race?
How much work does the sprinter do during the final 2.0 s of the
race?
What is the sprinter's average power output during the final 2.0
s of the race?

A helicopter, starting from rest, accelerates straight up from
the roof of a hospital. The lifting force does work in raising the
helicopter. An 780-kg helicopter rises from rest to a speed of 8.5
m/s in a time of 5.0 s. During this time it climbs to a height of
9.7 m. What is the average power generated by the lifting
force?

A helicopter, starting from rest, accelerates straight up from
the roof of a hospital. The lifting force does work in raising the
helicopter. An 790-kg helicopter rises from rest to a speed of 7.0
m/s in a time of 4.0 s. During this time it climbs to a height of
7.3 m. What is the average power generated by the lifting
force?

A car accelerates uniformly from rest to 17.9 m/s in 6.31 s
along a level stretch of road. Ignoring friction, determine the
average power required to accelerate the car if (a) the weight of
the car is 8.28 x 103 N, and (b) the weight of the car is 1.58 x
104 N.

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