A skier is standing still on a flat area of snow. The weight of the skier is 550 N. The total area of his skis in contact with the ground is 0.015
m2.
What is the pressure exerted on the ground by the skier?

3700 N / m2
37 000 N/m2
8.3 N/m2
0.83 N/m2

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Estimate the schwarzschild radius (in kilometers) for a mini-black hole formed when a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (assume that the your weight is 50 kg)

What sort of waves exhibit the doppler effect?