Physics Past Questions and Answers

What is the kinetic energy of a rock of mass 220 g after it has fallen freely for 5 seconds? g=10m/s².

When equal masses of iron and water are given equal quantity of heat, the piece of iron becomes much hotter than water after a shorter time because:

The speed of light in air is 3.0x108 m/s. What is its speed in glass having a refractive index of 1.65?

Atmospheric pressure is 1.0x105 N/m2. If the barometer liquid has a density of 1250 kg/m³.
what is the minimum length of the tube required? g=10m/s2.

Young's modulus for steel is 2x1011 N/m2. Aweight of \(100 N\) hangs froma steel wire of length 3 \(m\) and cross-sectional area \(1.5 \times 10-6 m 2\). Calculate the extension is \(0.25 mm\), calculate the extension produced