A proton and electron, each travelling at the same speed, enter a region of uniform magnetic field. They experience
A. forces in the same direction and having ratio Fp/Fe= me/mp
B. forces equal in magnitude, but opposite in direction
C. forces opposite in direction and having ratio Fp/Fe= me/mp
D. the same force
B. forces equal in magnitude, but opposite in direction
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If a wave has a frequency of 8 Hz, it has a period of _______.
a. 1/8 s. b. 8.5 s. c. 8 s. d. 4 s.
You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is
A. the force the Earth exerts on the scale. B. the force you exert on the Earth. C. the force the scale exerts on you. D. the force you exert on the scale. E. the force the scale exerts on the Earth.
Does Venus have auroras around its poles, like Earth? Why or why not?
A) Yes, because it is bombarded by charged particles from the Sun. B) No, because its atmosphere is too thick. C) Yes, because strong winds generate light near its poles. D) No, because it lacks a global magnetic field.
Will Mars ever appear to the unaided eye as large as the Moon at closest approach? Explain
What will be an ideal response?