4A force of 90N is used to push a box along a ramp of length 10m, up to a platform. ‘The platform is 4mm above the ground. The weight of the box is 200N. Which of the following expressions could be used to determine the efficiency of the ramp? oa 90 x 10 2004 200 x4 (00x 10) + (200 x 4) 200 x4 90x 10 90x10 (90 x 10) + (200 x 4) (Total for Question 4 = | mark) 8 A ball is dropped, bounces once and is then caught. Which of the following graphs of gravitational potential energy £,., against time # could represent the motion of the ball? Ew | | Fam | Ex | ' ' ' ' oa os oe op (Total for Question 8 = 1 mark)7 A.water pump causes 200g of water to be ejected from the nozzle of a garden hose each second at a velocity of 3ms7. Which of the following expressions could be used to determine the minimum output power in watts required from the pump? 200x¥ oa (Total for Question 7= 1 mark) 4 Thearea under each of the following graphs represents a physical quantity. For which graph is the area under the graph mot equal to work done? 8 5 a g : i i Displacement Extension Time Strain Oa OB Gc op (Total for Question 4 = 1 mark) 8 An electric pump lifts water from a well through a height of 10m at a rate of 4kgs* The water leaves the pump with a velocity of Sms" as shown, water lifted at 4kgst | water leaves, pump at Sms* Which of the following expressions could be used to determine the minimum power output of the pump in watts?1 2) Ba taxs DB (4x 981 x 10) B € axgsixi9+F4x5) a D @x9six 19) ~+ax5) (Total for Question 8 = 1 mark) A motor with an efficiency of 68% is used to raise a load of 350N through a height of 25m. Which of the following expressions gives the energy supplied to the motor? Oa 350 x25, (Total for Question 8 = 1 mark) The diagram shows a roller coaster. A roller coaster car stops momentarily at P before descending towards Q. P 75m Q AM Which of the following expressions could be used to determine the velocity of the roller coaster car at Q?GA Vise - 30g & B is0g — J60g Oc (ee OD og (Total for Question 3 = 1 mark) 6 A lamp with an efficiency of 0.68 usefully transfers 120 of energy. Which of the following can be used to determine E, the energy supplied to the lamp? [A B=068 x 120x 100 BB £=068 x 120 (Total for Question 6 = 1 mark) 2 An object of mass 8.2kg, initially at rest, falls a vertical distance of 25m through the air and has a final velocity of 20ms” Which of the following gives the energy in joules dissipated by air resistance? G A 82x981x25 TL B O5x82x20°+ 82% 981 x25 GC 82x981x25-0.5x8.2x 20 GD 05x82x 20-82 9.81 x25 (Total for Question 2 = 1 mark)10 A locomotive pulls a train at constant speed against a force of $400KN. The output power of the locomotive is 70 MW. Which of the following gives the time in seconds for the locomotive to pull the train a distance of | km? o 70 x 10° & S400% 10" o 70 B S400 x10" 8.4 x 10° 10° ae 7x10" 8400 a 70 x 1000, (Total for Question 10 = 1 mark) 4) Ahydroelectric power station has an efficiency of 32%. In one hour the useful energy output of the power station is 1.2 x 10"J. Which of the following expressions gives the total power input to the power station in watts? DA 12x 108x032 1.2 x10 a 0.32 x 3600 1.2108 x 0.32 ise 3600 1.2. x108 5 0.32 (Total for Question 4= 1 mark)8 Acrane lifts a container of weight 4.0 x 10°N through a height of 25m. Which of the following gives the gravitational potential energy gained by the container in joules? DA 40x10°x9.81 x25 OB 40x 10°25 GO C¢ 40x10°x25+9: O D 40x10°+981 (Total for Question 8 = 1 mark) 1A machine has a power of 750W and transfers 1SOKI of energy during a time 1. ‘Which of the following expressions gives f in seconds? oa 20 150 os 750 « 150 1000 oc 150 * 1000 750 op 750 150 x 1000 (Total for Question 1 = 1 mark) 9 Acyclist rode along a slope at a constant speed. The increase in vertical height of the cyclist was Ab. The slope was at an angle 6 to the horizontal as shown. ‘The forward force of the road on the bicycle was F and air resistance was negligible. Which of the following gives the work done by the cyclist?OA FAhcos FAh cos Oc FaAhsind Fah sind (otal for Question 9 = 1 mark) 9 Aproton and an electron have equal kinetic energies. The speed of the proton is v. ‘The mass of a proton is 2000 times greater than the mass of an electron. Which of the following expressions gives the speed of the electron? GA y2000 xv v ¥2000 a 2000 os OD 2000x¥ (Total for Question 9 = 1 mark) 10 An electric pump has an output power of 25kW and an efficiency of 52%, ‘Which of the following expressions gives the rate in kW at which energy is dissipated? O A 048% 25 OB 052x25 0.48 x 25 0.52 5 0.52 (Total for Question 10 = 1 mark)8 A motor lifis a mass of 50000kg through a vertical height of 25m. The motor has an output power of TOOKW. Which of the following gives the time in seconds taken to lift the mass? o 4 50000% 700000 50000 x 9.81 25 OB 700000 5000025 700 Bp 30000x 98125 700 (Total for Question 8 = 1 mark)