D: 8.0ρ
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A steel ball is released just below the surface of thick oil in a cylinder. During the first few centimetres of trave…
A hard stone hits the ground and comes to rest almost immediately. As the stone hits the ground, what is the directio…
A car of mass 1500 kg is towing a trailer of mass 1100 kg along a level road. The acceleration of the car is 1.30 m/s…
The diagram shows part of an a.c. generator when its coil is in a horizontal position. The graph shows the voltage ou…
An alternating voltage of frequency 0.5 Hz is applied to the Y-plates of a cathode-ray oscilloscope (c.r.o.). The dia…
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms o…