The picture below shows a sphere as it looks at rest. Suppose the sphere is moving to the right at about 90 percent of the speed of light. Which figure below correctly shows the shape of the sphere as you would measure it?
A) Figure A
B) Figure B
C) Figure C
D) Figure D
E) Figure E
B) Figure B
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Wave Characteristics: An electromagnetic wave travels in free space in the +y direction, as shown in the figure. If the electric field at the origin is along the +z direction, what is the direction of the magnetic field?
A. +z B. -z C. +y D. +x E. -x
A satellite is in a low circular orbit about the Earth (i.e., it just skims the surface of the Earth). How long does it take to make one revolution around the Earth?
What will be an ideal response?
To explain its magnetic field, Europa must have an ocean of
A) molten iron. B) hydrogen. C) ammonia ice. D) liquid water. E) liquid methane.
The force that holds a satellite in orbit around Earth is caused by
a) the gravitational pull of Earth. b) friction as the satellite moves through the air. c) the thrust of a jet engine always being fired toward the center of the Earth. d) conservation of angular momentum.