Force on a Moving Charge: An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component
A. towards the north.
B. towards the south.
C. upward.
D. downward.
E. towards the west.
Answer: A
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Which of the following statements about the Moon is not correct?
A. The acceleration due to gravity on the Moon is weaker than on Earth. B. Earth's gravitational pull on the Moon equals the Moon's gravitational pull on Earth. C. There is a net force acting on the Moon. D. The Moon is not accelerating.
Two harmonic sound waves reach an observer simultaneously. The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity
What is the difference in frequency of the two sound waves? A) 10.0 Hz B) 0.200 Hz C) 5.00 Hz D) 2.50 Hz E) 1.25 Hz
What is the equivalence principle of the general theory of relativity?
a. E0 = mc2. b. Constant velocity is equivalent to a uniform gravitational field. c. Gravitational potential energy is equivalent to mass. d. Constant acceleration is equivalent to a uniform gravitational field. e. Any acceleration is completely equivalent to a uniform gravitational field.
A baseball is struck by a batter at an angle such that it reaches its maximum height at the location of the pitcher – and just grazes the top of the pitcher’s head (at an elevation of 1.50m above the launch point of the baseball). The pitcher is a horizontal distance of 20.0m from the point at which the ball was struck. What was the launch speed for the baseball?
A. 37 m/s B. 36m/s C. 51m/s D. 27m/s