t) mover a large crate, (mass a 75 kg), the inside of a to the back end, distance A of 300 from If the crate this i of 6 m), exerting a steady net Newtons. what is his power output during this time? (2) What must be the power output of an elevator motor that can lift a total mass of 1000 kg, and provide the elevator a constant speed of 8.0 m/s? (3) An individual runs up some steep stais, elevating his 105 kg body a vertical distance of 9.6 meters in 11.2 seconds. What was the power output? (4) A new conveyer system utilizes a motor-powered arm to exert an average force of 890 N to push large crates a distance of 12 meters in 22 seconds What is the power output required by such a motor? (5) An elevator is capable of transporting passengers at a speed of 16.8 m/s. The combined mass of the passengers and cart is 1390 kg. What power output required to deliver this many passengers at this is
Only one question can be answered in one posting, however as a special case question 1 and 2 and answered, please post each question separately. The image is of very poor quality to read.
(1)
Force applied F = 300N
Distance moved s= 6 m
Work done = Force x displacement
= 300*6 = 1800 Joules.
Work done is energy delivered.
Power is rate of work done or energy delivered per unit time.
The above work is done in 20 seconds
Power output = 1800/20 = 90 watts ( watt= joules/s)
(2)
Mass m = 1000 kg
Gravitational force acting on the mass = mg = 1000*9.8
= 9800 N
Elevator speed = 8.0 m/s
Distance moved in 1 s = 8.0 m
Work done in 1 s = 9800*8 = 78400 joules
Power output = 78400 watts.
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