A red crab crawling very deep in the water where sunlight is very dim appears
A) red.
B) orange.
C) cyan.
D) brown.
E) black.
Answer: E
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A set of charged spheres carries -1.5 mC and each has mass 15 ?g. What vertical electric field in the laboratory would cause these spheres to continue in a straight line if they were projected horizontally into the electric-field region?
A. -98 ?V/m B. 10 mV/m C. -10 mV/m D. 98 ?V/m
The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 70 V B) 30 V C) 100 V D) 400 V E) 480 V
A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and experiences no appreciable air resistance as it moves
(a) How far from where the child is standing does the ball hit the ground? (b) How long is the ball in flight before it hits the ground? (c) What is the magnitude of the ball's velocity just before it hits the ground?
Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of __________
Fill in the blank(s) with correct word