A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the collision?
A) zero
B) +3.0 m/s
C) -2.0 m/s
D) +2.5 m/s
E) +5.0 m/s
B
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In which of the following types of galaxies would you expect to find active star formation?
a. elliptical galaxies only b. elliptical and spiral galaxies c. spiral galaxies only d. elliptical and irregular galaxies e. spiral and irregular galaxies
On some telescopes, actuators on the mirror change its shape to match distortions in the atmosphere. What is this technique called?
A. actuary observing B. interferometry C. adaptive optics D. refraction
A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
A bar magnet is dropped from above and falls through the loop of wire shown below. The north pole of the bar magnet points downward towards the page as it falls. Which statement is correct?
A. The current in the loop always flows in a clockwise direction. B. The current in the loop always flows in a counterclockwise direction. C. The current in the loop flows first in a clockwise, then in a counterclockwise direction. D. The current in the loop flows first in a counterclockwise, then in a clockwise direction. E. No current flows in the loop because both ends of the magnet move through the loop.