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A water jet starts at a point X and reaches its maximum height at a point Y. Air resistance has a negligible effect on the motion of the water jet. (i) State the direction of the force acting on the jet at Y. (1 mark)

(i) The only force acting on the water jet is gravity which always acts vertically downwards so the force at Y, as well as every point between X and Y, is down.Simply writing "down" would still get...
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Answered by Tate C. • Physics tutor
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State one advantage and one disadvantage of using a CT scanner, compared with ultrasound scanning, for forming images of the inside of the human body. (2 Marks)

Advantage- Computeried Tomography provides an image with greater resolution than ultrasound. (1 mark) It also produces a 3D image made from lots of individual slices which can be viewed from various differen...
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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
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