Uncategorized Quiz: P1 Conservation and dissipation of energy Y0219cn_Bul January 9, 2021 No Comments 28 Created on January 09, 2021 P1 Conservation and dissipation of energy This quiz covers the Physics Topic 1: Conservation and dissipation of energy 1 / 18 The springs in a car’s suspension have a spring constant of 50 000 N/m. The elastic potential energy store is 0.025 J. Calculate the extension of the springs. 0.01 mm 1 mm 625 mm 10 mm 2 / 18 A machine is 40 % efficient. The total energy supplied to the machine is 4 kJ. Calculate how much useful energy can be transferred. 1600 J 10 kJ 1.6 J 100 J 3 / 18 The table shows the power ratings of some different appliances. Place the appliances in order of power rating, starting with the lowest power rating. CBDA BADC ABCD BDCA 4 / 18 A spring with a spring constant of 50 N/m is stretched by an extension of 2 cm. Calculate the energy in its elastic energy potential store. Use the equation:elastic potential energy = 0.5 × spring constant × extension2 100 J 50 J 0.01 J 0.5 J 5 / 18 A motor has an input power of 120 W and is 40 % efficient. Calculate the power wasted by the motor. 48 W 3 W A. 72 W 4800 W 6 / 18 A suitcase of mass 20 kg moves along a conveyer belt at 0.5 m/s. Calculate its kinetic energy. 5 J 2.5 J 5 kJ 10 J 7 / 18 A motor transfers 12 kJ of energy in 30 s. Calculate its power. 400 J 400 W 360 kW 0.4 W 8 / 18 A person climbs up some stairs. Which sentence about the change in energy stores is correct? The change in the gravitational potential energy store depends on the weight of the person and the change in height. The change in the kinetic energy store depends on the person’s mass and the change in height. The change in the kinetic energy store depends on the person’s weight and the change in height. The change in the gravitational potential energy depends on the person’s mass and their change in weight. 9 / 18 Calculate how much work is done when a force of 1600 N pulls a car through a distance of 40 m in the direction of the force. 40 J 64000 J 64000 N 40 N 10 / 18 Read the descriptions below about energy transfers when a heavy object is dropped. Only one description is correct. Select the correct description. Before the object is dropped all of the energy is in the gravitational potential energy store. As the object falls energy is transferred to the kinetic energy store. When the object hits the ground the energy from the kinetic energy store is lost. Before the object is dropped all of the energy is in the kinetic energy store. As the object falls the kinetic store gets bigger. When the object hits the ground all of the energy from the kinetic energy store is transferred to the thermal energy store by heating, and as sound waves. Before the object is dropped all of the energy is in the gravitational potential energy store. As the object falls, energy is transferred to the kinetic energy store. When the object hits the ground all of the energy from the kinetic energy store is transferred to the thermal energy store by heating, and as sound waves. Before the object is dropped all of the energy is in the gravitational potential energy store. As the object falls energy from the gravitational potential energy store is lost. By the time the object hits the ground there is no more energy left, 11 / 18 Which of the following statements about a closed system is correct? some of the energy is dissipated from the system energy is only transferred out of the system the total energy is always the same before and after an energy transfer there is no transfer of energy within the system 12 / 18 Which of the following involves useful energy transfers by heating and by a force? drying clothes in a tumble dryer cooking a pizza in an electric oven going up in a lift driving an electric car 13 / 18 Which of the following is an energy store? heating waves thermal electrical current 14 / 18 Whic one is NOT an energy store? Elastic Potential Clinical Thermal Nuclear 15 / 18 A 25000 kg plane takes off and climbs to a height of 12000 m above it’s take off point. How much energy has been transferred to its gravitational potential energy store? 2 920 000 000 J 2 940 000 000 J 1 250 000 J 3 270 000 000 J 16 / 18 We can calculate the gravitational potential energy using this:(gpe) E = m __ hSelect the correct letter to complete the above formula. g f v 17 / 18 A motorbike with 1.17 x 104 J energy in its kinetic energy store travels at 12.0 m/s. What is the mass of the motorbike? 162.5 kg 170 kg 160 kg 158.6 kg 18 / 18 Complete the conservation of energy principle statement, by selecting the correct pair of words from the options.Energy can be _____________________ usefully, stored, or dissipated, but can never be ___________________ or destroyed. transferred, calculated created, transferred limited, transferred transferred, created Your score is The average score is 17% LinkedIn Facebook Twitter 0% Restart quiz Rate this Quiz. Send feedback Leave a Reply Cancel replyYour email address will not be published. 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