The gravitational force exerted by the Earth on the Moon holds the moon in an orbit around the Earth. Let us assume that the orbit is perfectly circular. The work done by this gravitational force during a one week interval in which the moon moves through a displacement in its orbital path is
1.negative.
2.zero.
3.positive.
4.impossible to determine with the information given.
2
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An organ pipe is 60.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 300 Hz higher than the frequency of the second mode. What is the velocity of sound?
A. 280 m/s B. 300 m/s C. 320 m/s D. 340 m/s E. 360 m/s
The first planets around other Sun-like stars were discovered
A) by Huygens, following his realization that other stars are Suns. B) by Galileo following the invention of the telescope. C) at the turn of last century. D) about a decade ago. E) at the turn of this century.
_____ is the principal means of energy transport in the interiors of most stars
A) Conduction B) Radiation C) Evaporation D) Advection
A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?
A) 0.090 A B) 1.0 A C) 12 A D) 11 A