Physics Review Assignment

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University of British Columbia *

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10BC

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Physics

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Dec 6, 2023

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Uploaded by jessika0800

Physics Review Assignment / 50 marks Show all appropriate work where necessary. Credit will not be given for questions where only the answer is provided. Where applicable, round all answers to the nearest tenth. 1. Energy can be classified into two main categories: ___________ and _____________. / 1 mark 2. Provide a brief explanation of the Law of Conservation of Energy and include an example. / 2 marks 3. Describe the three different types of systems used in the explanation of the Law of Conservation of Energy. Include a diagram (different from the one in the notes) to demonstrate your understanding . / 2 marks 4. Please look over the following example:

Use your knowledge of the Law of Conservation of Energy and provide hypothetical values for Kinetic and Potential Energy for the three phases of the roller coaster to make the following statement true: / 2 marks E k + E p = E k + E p 5. If a tractor is 40% efficient and contains 400 000 kJ of energy, what is the amount of mechanical energy obtained from the fuel? Show all work. / 1 mark Energy in: 400,000 kJ Energy out: ? Efficiency: 40% = 0.4 Efficiency = energy out/energy in 0.4 = energy out / 400,000 0.4 x 400000 = energy out 160000 kJ = energy out 6. A flashlight receives 4500 J of electrical energy. It produces 250 J of light energy. Calculate the efficiency of the flashlight. Show all work. / 2 marks Energy in: 4500 J Energy out: 250 J Efficiency = energy out/energy in *100 =250/4500 *100 = 0.05 *100 Efficiency = 5% 7. If an electric generator is 30% efficient and the transmission system that delivers power to consumers is 60% efficient. What is the overall efficiency? Show all work. / 1 mark Total efficiency = Efficiency of machine 1 * 100 x Efficiency of machine 2 * 100 30%/100 x 60%/100 = total

0.3 * 0.6 = 0.18 = 0.18 *100 Total efficiency = 18% 8. Write out the formulas for calculating Kinetic Energy and Potential Energy and also include which units are used for each variable in the equation . / 3 marks 9. A bullet is fired from a gun with a speed of 2000 cm/s. If the bullet has a mass of 0.02 kg, the amount of kinetic energy it has is: Show all work. / 2 marks KE = (0.5) (m) (v) 2 KE = 0.5 (0.02) 10. Given that the kinetic energy of a 1.5 kg bowling ball is 15 J, calculate its velocity? Show all work. / 2 marks 1. Formula: KE = (0.5) (m) (v) 2 2. List variables: m = 1.5, KE = 15 J, v = ? 3. Plug in variables into formula KE = (0.5) (m) (v) 2 15= 0.5 (1.5) v^2 15 = 0.75 v^2 15/0.75 = v^2 20 = v^2 Sqrt 20 = v v= 4.47 m/s

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11. How fast would a 2.1 kg ball be travelling if it had 560 J of kinetic energy? Show all work. / 2 marks KE = (0.5) (m) (v) 2 560= 0.5 (2.1) (v) 2 560 = 1.05 v^2 560/1.05 = v^2 533 = v^2 23 m/s = v 12. How much would a car weigh if it travelling 15 m/s and has 75 000 J of kinetic energy? Show all work. / 2 marks KE = (0.5) (m) (v) 2 75000 = 0.5 m 15 2 75000 = 112.5 m 75000/112.5 = m m = 666.66 kg 13. What is the potential energy a 9 kg dog has sitting 11 metres above the ground? Show all work. / 1 mark PE = ? M = 9 G= 9.8 H = 11 PE = m g h PE = 9 X 9.8 X 11 = 970.2 J 14. If a baseball weighing 40 g is thrown and is moving at 1.5 m/s 4 metres above the ground. Calculate the potential energy of the ball. ( g = 10 m/s 2 ) Show all work. / 1 mark

PE = m g h G = 10 m/s^2 M = 40 g --  0.04 kg H = 4 m PE = m g h PE = 0.04 * 10 * 4 PE = 1.6 J 15. A worker lifts a concrete block up 2 metres. It now has 165 J of energy. What was the weight of the block? Show all work. / 1 mark PE = 165 M = ? G= 9.8 H = 2 PE = m g h 165 = m 9.8 2 165 = m 19.6 165/19.6 = m 8.41 kg = m 16. A pile driver is raised to a height of 8 metres. How high would another pile driver with half the mass of the first have to be in order to have the same amount of potential energy? Show all work. / 2 marks PE 1 = PE 2 m g 8 = 0.5 m g H 8 m g / 0.5 m g = h 16 = h 17. Two trailers, X with a mass of 600 kg and Y with a mass of 1800 kg, are being pulled at the same speed. What is the ratio of kinetic energy of the Y to the kinetic energy of X? Show all work. / 3 marks

18. A man is rolling a motorbike up the hill using 750 N of force. He does 8000 J of work. How far did he push up the motor bike? Show all work. / 1 mark F = 750 N W = 8000 J d = ? W = F * d 8000 = 750 d 8000/750 = d 10.6 m = d 19. If 25000 J of work is used to lift a 1200 kg car, how high was it raised?? Show all work. / 2 marks W: 25000 F = m * g = 1200 * 9.8 = 11760 N d: W = F * d 25000 = 11760 d 25000/11760 = d 2.13 m = d 20. How much force was applied to move an object 75 metres using 3000 J of energy? Show all work. / 1 mark W: 3000 J F: ? d: 75 m W = F * d 3000 = F 75 3000/75 = F

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40 N = F 21. When a bullet is fired from a gun, 20 0000 J of work is done over a distance of 650 metres. What force was applied? Show all work. / 1 mark W: 200,000 J F: xx d: 650 m W = F * d 200000 = F 650 200000/650 = F 307.69 N = F 22. How much work has been done to move a desk 2 metres when 125 N of force is used? Show all work. / 1 mark W: ? F: 125 N d: 2 m W = F * d W = 125 * 2 W = 250 J 23. A baseball player does 800 J of work on a 450 g baseball when he hits it out of the park. How far was the ball hit? Show all work. / 2 marks W = 800 m = 450 g = 0.45 kg d = ? W = m g d 800 = 0.45 (9.8)d 800 = 4.41 d 800/4.41 = d d = 181.4 m 24. Demonstrate that it takes twice as much work to raise a 1000 kg car and a 2000 kg car the same distance? Show all work. /3 marks

W = 2(W) Fd = 2Fd mgd = 2 mgd 2000gd = 2(1000)gd 2000=2000, so yes, it takes twice as much work 25. If a 15 N book is lifted 1.2 metres, then how high would you have to lift a larger 30 N book to give the same energy? Show all work. / 2 marks F1 = 15N d1 = 1.2 m F2 = 30 N d2 = ? F1d1 = F2d2 15 (1.2) = 30 d2 18 = 30 d 18/30 = d 0.6 m = d 26. Describe the process of nuclear fission? /1 mark 27. Describe the process of nuclear fusion? /1 mark

28. 14 6 C has how many neutrons and how many protons? /1 mark 29. What are three types of radioactive emissions? Give an example of each type. /3 marks 30. If Uranium has a mass number of 235. How many neutrons does it have? /1 mark

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