Work, Energy, And Power - SS1 Physics Past Questions and Answers - page 3
Which of the following equations represents the relationship between power, work, and time?
Power = Work x Time
Power = Work / Time
Power = Time / Work
Power = Work + Time
A machine can do 500 Joules of work in 10 seconds. What is the power output of the machine?
5 Watts
10 Watts
50 Watts
100 Watts
A light bulb has a power rating of 60 Watts. How much energy does it consume in 5 hours of operation?
12 Joules
60 Joules
300 Joules
180,000 Joules
A motor does 500 Joules of work in 2 seconds. What is the power output of the motor?
A light bulb has a power rating of 40 Watts. How much energy does it consume in 6 hours of operation?
The engine of a car produces 200 horsepower. What is its power output in Watts?
A water pump lifts 2000 litres of water to a height of 10 meters in 5 minutes. What is the power output of the pump?
A man who has a mass of 70kg climbs a staircase consisting of 50 steps in 30 seconds. Each step is 0.2 metres high. What is the power output of the man?
A ball is released from the top of a hill and rolls down to the bottom. Which of the following statements is true regarding the conservation of mechanical energy?
The total mechanical energy of the ball decreases as it rolls down the hill
The total mechanical energy of the ball remains constant as it rolls down the hill
The total mechanical energy of the ball increases as it rolls down the hill.
A pendulum swings back and forth. At the highest point of each swing, which of the following statements is true regarding the conservation of mechanical energy?
The total mechanical energy of the pendulum increases
The total mechanical energy of the pendulum decreases
The total mechanical energy of the pendulum remains constant.