A horizontal spring-mass system oscillates on a frictionless table. If the ratio of the mass to the spring constant is 0.037 kg·m/N, and the maximum speed of the mass was measured to be 4.5 m/s, the maximum extension of the spring will be cm.
A rocket has an initial mass of 2 x 104 kg, a mass ratio of 3, a burning rate of 100 kg/sec, and an exhaust velocity of 980 m/sec. The rocket is fired vertically from the surface of the earth. How long after ignition of the engines will the rocket leave the ground? (R1P14-3, 493)
For the 2P → 1S transition in the hydrogen atom calculate ω. Assuming the
spontaneous emission lifetime of the 2P state to be 1.6 ns, calculate the Einstein B
coefficient. Assume n0 ≈1.