Mars has two moons that are most similar in character to
A) small asteroids.
B) comets.
C) Earth's Moon.
D) particles in the rings of Saturn.
A
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At temperatures above 0.80 of the melting temperature and at very low stress, the primary mechanism of creep strain in metals is
(a) Cobel creep. (b) Dislocation glide (c) Dislocation creep (d) Herring-Nabarro vacancy flux
Impulse: A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.050 s. What is the magnitude of the average force exerted on the wall by the ball?
A. 800 N B. 400 N C. 55,000 N D. 27,500 N E. 13,750 N
The energy difference between adjacent orbit radii in a hydrogen atom
A) decreases with increasing values of n. B) increases with increasing values of n. C) remains constant for all values of n. D) varies randomly with increasing values of n.
Induced electric and magnetic fields produce
A) stronger electric or magnetic field. B) higher voltages produced by Faraday induction. C) both of these D) none of the above