An experimental rocket sled on a level, frictionless track has a mass of 1.4 X 104 kg. It propels itself by expelling gases from its rocket engines at a rate of 10 kg/s, at an exhaust speed of 2.5 × 104 m/s relative to the rocket. For how many seconds must the engines burn if the sled is to acquire a speed of 5.0 X 10¹ m/s starting from rest? You may ignore the small decrease in mass of the sled and the small speed of the rocket compared to the exhaust gas.

A mass, m, with speed, v, undergoes a perfectly elastic collision with an initially stationary I mass, M, as shown in the picture. What is the ratio of the two masses, m/M if after the collision, m and M have the same speed, V, but opposite velocities?

G12 Physics 277.1

Question 16 A series RLC ac circuit has R = 425 2, L = 1.25 H, C = 3.50µF, w = 377s and AVmar = 150 V. Determine impedance of the circuit in ohms. %3D

G12 Physics 278.1

Question 15 physics

1a, 1b, and 1c

4.8 Q16

Geometric physics q 39

Questions H,I