Practise selecting supplied CAIE A-Level Physics formulae and constants, then substituting consistent values to compare energies, networks and model equations.
Which amount of energy is not 2400 J ?
the decrease in gravitational potential energy of a mass of 60 kg when it moves vertically downwards through 40 m near the Earth's surface
the energy transferred in 15 s by a machine of power 160 W
the kinetic energy of a mass of 12 kg moving at a speed of 20 ms−1
the work done by a gas expanding against a constant external pressure of 120 kPa when its volume increases by 0.020 m3
A
Which amount of energy is not 2400 J ?
the decrease in gravitational potential energy of a body of mass 60 kg when it moves vertically downwards through 40 m near the Earth's surface
the energy transferred in 15 s by a machine of power 160 W
the kinetic energy of a body of mass 12 kg moving at a speed of 20 ms−1
the work done by a gas expanding against a constant external pressure of 120 kPa when its volume increases by 0.020 m3
A
In which situation is the least amount of energy transferred?
A A student and a motorcycle of total mass 80 kg come to rest from a speed of 2.0 m s−1.
B A student of mass 50 kg falls a vertical distance of 2.0 m .
C A student pushes a car with a horizontal force of 70 N for a horizontal distance of 2.0 m .
D A student switches on a 70 W lamp for 20 s .
C