A 320-g ball and a 400-g ball are attached to the two ends of a string that goes over a pulley with a radius of 8.7 cm. Because of friction in its axle, the pulley does not begin to rotate
What is the magnitude of the frictional torque at the axle of the pulley if the system remains at rest when the balls are released? A) 0.068 N ? m
B) 0.61 N ? m
C) 0.079 N ? m
D) 0.063 N ? m
E) 0.00070 N ? m
A
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Objects can be charged by
a. induction. b. friction. c. touching. d. All of the above. e. None of the above.
The heliocentric model of the solar system gained preference over the early Greek epicycle model because
A. the heliocentric model was simpler. B. only the heliocentric model could explain retrograde motion. C. the heliocentric model gave a more accurate description of observed planetary motions.
Ultraviolet light is shone on a piece of metal that has a known work function, and electrons are observed being produced through the interaction of the light with the metal. The lamp that produces the light is now replaced with a lamp of the same intensity, but which produces photons having a shorter wavelength. Which of the below differences is observed?
A. Fewer electrons per unit time are produced. B. More electrons per unit time are produced. C. Nothing changes at all. D. Electrons with a higher maximum energy are observed. E. Electrons with lower maximum energy are observed.
The point along a planet's orbit where it is closest to the Sun is called the orbit's
A) period. B) perihelion. C) eccentricity. D) semi-major axis. E) aphelion.