3) When its 75.0kW engine is generating full power, a small single-engine airplane with mass 750kg gains altitude at a rate of 2.50m/s. What fraction of the engine power is being used to make the airplane climb? (The remainder is used to overcome the effects of air resistance and of inefficiencies in the propeller and engine.) Express your answer as a percentage.

A 699-kg elevator starts from rest and moves upward for 2.60 s with constant acceleration until it reaches its cruising speed, 1.83 m/s. (a) What is the average power of the elevator motor during this period? hp (b) How does this amount of power compare with its power during an upward trip with constant speed? (Give the power during an upward trip with constant speed.) hp Need Help? Read It

デジタル形式で段階的に解決 ありがとう!! SOLVE STEP BY STEP IN DIGITAL FORMAT Calculate the power generated by a machine that lifts a 500-kg box to a height of 20.0m in a time of 60.0 s. Ans. 1.63kW.

(a) What is the power output in watts and horsepower of a 73.0 kg sprinter who accelerates from rest to 10.1 m/s in 3.50 s? power in watts ____ W power in horsepower _____hp (b) Considering the amount of power generated, do you think a well-trained athlete could do this repetitively for long periods of time?

A funny car accelerates from rest through a measured track distance in time 56 s with the engine operating at a constant power 230 kW. If the track crew can increase the engine power by a differential amount 1.0 W, what is the change in the time required for the run? Number i 8.1 Units S

Suppose you are biking at a constant speed up a road inclined at 5° above the horizontal. You need to bike up this hill for 200 m in 2 minutes or less. There is an average drag force of 25 N as well. Calculate the minimum amount of power in hp your body must provide in order to make it up this hill in time. Assume 80 kg total mass of yourself and bike and 25% energy efficiency in your body. Define a system and draw energy state diagrams as part of your solution. Draw any necessary FBDs for forces. B

4. This Olympic skeleton athlete slides down an icy track head first. The track has many twists and turns with a total height of 102.75 m. If the 99.375 kg man has a speed of 27 m/s at the bottom, what was the total work done on him by friction and air resistance slowing him down? (In other words, what was the energy lost to friction and air resistance?) He starts from rest at the top. Previous submissions:

The cheetah is one of the fastest-accelerating animals, because it can go from rest to 32.3 m/s 5.37 s. If its mass is 116 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in (a) watts(b) horsepower.