Q1. A 0.05 kg bullet travelling at 120m/s tears into a slab of thick wood. The wood exerts a constant retardation (negative acceleration) of magnitude 8000 m/s2. How long will it take the bullet to come to a stop?
Q2. Smoke particles in the air typically have masses of the order of 10 to 16 kg. The Brownian motion (rapid, irregular movement) of these particles, resulting from collisions with air molecules, can be observed with microscope.
(a) Find the root-mean-square speed of Brownian motion for a particle with a mass of 3.00 X 10 to 16 kg in air at 300 K.
(b) Would the root-mean-square speed is different if the particle were in hydrogen gas at the same temperature? Describe.