An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the x-axis, the second is 75 N along a direction making a clockwise angle of 150° with the x-axis
What is the direction of the third force, measured clockwise from the x-axis? A) 164°
B) 146°
C) 236°
D) 255°
E) 262°
E
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If the distance between two asteroids is doubled, the gravitational force they exert on each other will:
A) also be doubled. B) be half as great. C) be one fourth as great. D) be 1/16 as great. E) be four times greater.
A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on distant objects?
A) -4.2 m B) 4.2 m C) -5.2 m D) 5.2 m E) 4.8 m
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Which change will not affect the kinetic energy of the most energetic electrons emitted in the photoelectric effect?
a. changing the frequency of the light b. changing the metal the light is hitting c. changing the brightness of the light d. All of the above will affect the electron's kinetic energy.