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Question 1 of 6
1. Question
1 point(s)A pile driver can lift a pile head of mass 200kg to a height of 10m in 20s. During this time, 40 kJ of electrical energy is supplied to the pile driver. Find the efficiency of the motor.
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Question 2 of 6
2. Question
1 point(s)A lizard of mass 2kg climbed a tree from the ground to a height of 5m in 25s. Find the power of the lizard in this action.
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Question 3 of 6
3. Question
1 point(s)Which of the followings are the unit of power?
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Question 4 of 6
4. Question
1 point(s)The image shows a front-loading washing machine. Which of the followings are true regarding a front-loading washing machine compared to a top-loading washing machine.
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Question 5 of 6
5. Question
1 point(s)A student uses an electric kettle with 1.5kW output to boil water. Find the amount of energy supplied by the kettle in 10 minutes.
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Question 6 of 6
6. Question
1 point(s)Which of the following formulae are TRUE about power?
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