The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire?
A) 0.20 A
B) 0.40 A
C) 0.80 A
D) 3.2 A
E) 1.6 A
E
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Pressure in a Liquid: Consider a brick that is totally immersed in water, with the long edge of the brick vertical. The pressure on the brick is
A. the same on all surfaces of the brick. B. greatest on the face with largest area. C. greatest on the top of the brick. D. greatest on the sides of the brick. E. greatest on the bottom of the brick.
A sea breeze on a coast is the result of
a. Rayleigh scattering. b. a convection cycle. c. the Coriolis force. d. friction or drag.
Two wave crests are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere?
A) no B) Yes, if the waves have different amplitudes. C) Yes, if the waves have the same amplitude.
Astronaut Mark Uri is space-traveling from planet X to planet Y at a speed of relative to the planets, which are at rest relative to each other
When he is precisely halfway between the planets, a distance of 1.0 light-hour from each one as measured in the planet frame, nuclear devices are detonated on both planets. The explosions are simultaneous in Mark's frame. What is the difference in the time of arrival of the flashes from the explosions as observed by Mark? A) 0 min B) 180 min C) 90 min D) 360 min E) 113 min