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The cyclist used the brakes to slow down and stop the bicycle. A constant braking force of 140 N stopped the bicycle in a distance of 24 m. Calculate the work done by the braking force to stop the bicycle. Give the unit. (3 Marks)

Work done= force x distance.Here we are told that the force is 140N. The braking distance of the bike is 24m. Therefore, work done is 140 x 24=3360 (2 marks) Joules.(1 mark)The units of work done are Joules....
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Answered by Tate C. • Physics tutor
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Describe what happens to a star, after the main sequence period, for the star to eventually become a black dwarf. (5 Marks)

After the main sequence period, the amount of hydrogen in the stars core decreases causing the star to fuse helium nuclei instead. (Further explanation for clarification)This releases a lot of energy causing...
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Answered by Tate C. • Physics tutor
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Give one advantage and one disadvantage of using nuclear power stations rather than gas-fired power stations to generate electricity. (2 Marks)

Advantage- No CO2 emissions produced by nuclear power stations as they do not combust fuel to produce energy.Disadvantage- Nuclear power stations produce radioactive waste which is difficult and expensive to...
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Answered by Tate C. • Physics tutor
21830 Views

How do you use the grammar particle 了(le)?

了is one of the most commonly encountered grammar particles in the modern Chinese language and also one of the most difficult to grasp. The particle 了 can have many different functions in a sentence. Here are...
AJ
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Two cars are moving parallel to each other on a road. The first car is moving at a speed of 11 m/s, while the second car is moving at 17 m/s, what is the speed of the second car, relative to the first car.

The relative speed of the second car, with respect to the first car is 6 m/s. This is because they are both travelling in the same direction, but the second car is moving 6 m/s faster. That means, if we were...
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Answered by Adam G. • Physics tutor
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