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 95.00 kg mass after the explosion is
A. 1,190 J.
B. 8,600 J.
C. 18,750 J.
D. 22,560 J.
E. 23,750 J.
D. 22,560 J.
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A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?
a. the hoop b. the sphere c. the cylinder d. All go the same distance.
According to the principle of equivalence, observations made of falling objects at Galileo's Leaning Tower of Pisa are indistinguishable from observations made in
A) a spaceship orbiting in a gravitational field. B) a spaceship accelerating at g in deep space. C) any uniformly moving reference frame. D) all of the above E) none of the above
Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon.
b. most lie beyond dense dust clouds.
c. they have only a small surface area from which to emit.
d. the peak of their thermal emission is at much shorter wavelengths than visual
e. both c and d
Vision Problems: A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A. -0.28 diopters B. +0.28 diopters C. -3.6 diopters D. +3.6 diopters E. +1.8 diopters