1.7.1. Energy
A subsection of Physics, 0625, through 1. Motion, forces and energy
Listing 10 of 184 questions
A car of mass 900 kg is travelling at a steady speed of 30 m / s against a resistive force of 2000 N, as illustrated in . 2000 N resistive force 30 m / s Calculate the kinetic energy of the car. kinetic energy = Calculate the energy used in 1.0 s against the resistive force. energy = What is the minimum power that the car engine has to deliver to the wheels? minimum power = What form of energy is in the fuel, used by the engine to drive the car? State why the energy in the fuel is converted at a greater rate than you have calculated in .
0625_s10_qp_31
THEORY
2010
Paper 3, Variant 1
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A battery provides energy to an electric car. The electric car has an acceleration of 2.9 m / s2 when it moves from rest. The combined mass of the car and its driver is 1600 kg. Calculate the time taken to reach a speed of 28 m / s. time = Calculate the force required to produce this acceleration. force = Calculate the kinetic energy of the car when its speed is 28 m / s. kinetic energy = The time taken for the car battery to be recharged from zero charge to full charge is 8.3 h. The charge is delivered to the battery by a charger with a current of 32 A. Calculate the charge supplied by the charger. charge = Under ideal conditions, the car can travel a maximum distance of 390 km when the battery is fully charged. Suggest why, in normal use, the car needs to be recharged after travelling less than 390 km.
0625_s22_qp_43
THEORY
2022
Paper 4, Variant 3
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shows a skier taking part in a downhill race. The mass of the skier, including his equipment, is 75 kg. In the ski race, the total vertical change in height is 880 m. Calculate the decrease in the gravitational potential energy (g.p.e.) of the skier. decrease in g.p.e. = The skier starts from rest. The total distance travelled by the skier during the descent is 2800 m. The average resistive force on the skier is 220 N. Calculate the work done against the resistive force, work done = the kinetic energy of the skier as he crosses the finishing line at the end of the race. kinetic energy = Suggest why the skier bends his body as shown in .
0625_w15_qp_31
THEORY
2015
Paper 3, Variant 1
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Questions Discovered
184