A 100.0 kg mass is blown apart into a 95.00 kg piece and a 5.000 kg piece. After the blast, the two masses are moving apart with a relative velocity of 100.0 m/s. The kinetic energy of the 5.000 kg mass after the explosion is
A. 6,850 J.
B. 7,500 J.
C. 9,570 J.
D. 11,500 J.
E. 22,560 J.
E. 22,560 J.
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A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 ?T b. 61 ?T c. 43 ?T d. 81 ?T e. 1.4 ?T
Fireworks go off at the same time according to Earth clocks in two cities, Alum and Boron, that are 300 km apart. The people in a spaceship that is flying in a straight line from Alum to Boron at 0.80 c also observe the fireworks. Do they see the fireworks in the two cities simultaneously? If the people in the spaceship say the fireworks were not simultaneous in Alum and Boron, how long before or
after the fireworks flashed at Alum did the fireworks flash at Boron according to their calculations? (The spaceship is directly over Alum when the fireworks flash.) a. Yes; 0 b. Before; 1.0 × 10^?3 s c. After; 1.0 × 10^?3 s d. Before; 1.3 × 10^?3 s e. After; 1.3 × 10^?3 s
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1) b. nRT ln (V2/V1) c. nk ln (V2/V1) d. 0 e. nR V2/V1
Huygen's principle indicates
A) each point on a wavefront is a source of wavelets. B) materials are isotropic. C) light travels with speed c. D) all of the above. E) none of the above.