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8 questions
Kinetic energy of a moving car equals to:
(1/2) X (mass of the car) X (velocity of the car)2
(1/2) X (mass of the Earth) X (velocity of the Earth)2
(1/2) X (mass of the road) X (velocity of the road)2
(1/2) X (mass of the wind) X (velocity of the wind)2
Gravitational potential energy of a ball on a cliff equals to:
There are two correct answers.
(mass of the ball) X (height of the cliff)
(weight of the ball in Newton) X (height of the cliff)
(mass of the cliff) X (gravitational field strength on Earth) X (height of the cliff)
(mass of the ball) X (gravitational field strength on Earth) X (height of the cliff)
A ball is on top of a cliff. The gravitational field strength is 10N/kg. What is its total gravitational potential energy when it is at the top of the cliff.
1000Joules
10 000Joules
100Joules
10Joules
At the top of the cliff, the ball has gravitational potential energy of 10 000joules. After a fall, at the bottom of the cliff, all of these potential energy has changed to kinetic energy. What is the velocity of the ball just before it hits the sea? which formula would you use?
2 X 10kg X velocity2 = 10 000joules
1/2 X 10kg / velocity2 = 10 000joules
1/2 X 10kg X velocity = 10 000joules
1/2 + 10kg X velocity2 = 10 000Joules
Each side of the weight bar is 40 kg. what is its total MASS?
40kg
20kg
80kg
100kg
Given the gravitational field strength is 10N/kg, what is the total WEIGHT of the bar weight?
400N
800N
200N
1600N
Given the gravitational field strength is 10N/kg, what is the total WORK DONE by the weight lifter?
800N x 1.2m = 960Joules
800N x 0.6m = 480Joules
400N x 0.6m = 240Joules
400N x 1.2m = 480Joules
Given the gravitational field strength is 10N/kg, the total work done by the weight lifter is 960 joules.
The weight lifter takes 5 seconds to lift the weight bar.
How would you quantify how powerful he is? (what is his POWER rating).
960J / 5s = 192Watts
5s / 960J = 0.0052Watts
960J x 5s = 4800Watts
960J / 10s = 96Watts
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