(a) In 2.0 minutes, a ski lift raises 5 skiers at constant speed to a height...
(a) In 2.0 minutes, a ski lift raises 5 skiers at constant speed to a height of 120 m. The average mass of each skier is 65 kg. What is the average power provided by the tension in the cable pulling the lift?
(b) A person is making homemade ice cream. She exerts a force of
magnitude 23 N on the free end of the crank handle on the ice-cream
maker, and this end moves on a circular path of radius 0.27 m. The
force is always applied parallel to the motion of the handle. If
the handle is turned once every 1.8 s, what is the average power
being expended?
Homework Answers
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(a) In 2.0 minutes, a ski lift raises 5 skiers at constant speed
to a height...
In 2.0 minutes, a ski lift raises 4 skiers at constant speed to a height of...
In 2.0 minutes, a ski lift raises 4 skiers at constant speed to a height of 135 m. The average mass of each skier is 65 kg. What is the average power provided by the tension in the cable pulling the lift?
In 2.0 minutes, a ski lift raises 4 skiers at constant speed to a height of...
In 2.0 minutes, a ski lift raises 4 skiers at constant speed to a height of 115 m. The average mass of each skier is 65 kg. What is the average power provided by the tension in the cable pulling the lift? _____________ W
In 2.97 minutes, a ski lift raises four skiers at constant speed to a height of...
In 2.97 minutes, a ski lift raises four skiers at constant speed to a height of 131 m. The average mass of each skier is 69.6 kg. What is the average power provided by the tension in the cable pulling the lift?
3. At a ski resort a chair lift takes skiers up a 30° hillside to an...
3. At a ski resort a chair lift takes skiers up a 30° hillside to an elevation of 180 m as shown in figure 1. How much horsepower must the engine have to pull 50 skiers at a time, at a speed of 4.0 m/s, if the average mass of each skier and their equipment is 82 kg each and the frictional energy loss is 3.6MJ (Mega-Joules)? Hint: Power-Work/time
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses 2.20...
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses
2.20 gallons of gasoline. Only 30% of the gasoline goes into useful
work by the force that keeps the car moving at constant speed
despite friction. (The energy content of gasoline is 1.3 ✕
108 J per gallon.)
(a) What is the force exerted to keep the car moving at constant
speed?
N
(b) If the required force is directly proportional to speed, how
many...
3. At a ski resort a chair lift takes skiers up a 30° hillside to an elevation of 180 m as shown in figure 1. How much horsepower must the engine have to pull 50 skiers at a time, at a speed of 4.0 m/s, if the average mass of each skier and their equipment is 82 kg each and the frictional energy loss is 3.6MJ (Mega-Joules)? Hint: Power-Work/time
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses
2.20 gallons of gasoline. Only 30% of the gasoline goes into useful
work by the force that keeps the car moving at constant speed
despite friction. (The energy content of gasoline is 1.3 ✕
108 J per gallon.)
(a) What is the force exerted to keep the car moving at constant
speed?
N
(b) If the required force is directly proportional to speed, how
many...
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