An electronic component with a 17-? resistor is rated for use at power levels not exceeding What is the safe current through the component?
A) 0.91 A
B) 1.21 A
C) 238 A
D) 0.22 A
A
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What eventually happens to a comet when its orbit brings it into the inner Solar System? a. It builds up speed and increases its orbital period
b. It is vaporized by the Sun, becoming inactive rock and dust. c. It is pulled in by the gravitation forces of a Terrestrial planet. d. It is blasted apart by asteroids within the asteroid belt. e. It absorbs more ice and rock from asteroids within the asteroid belt.
Most of the galaxies in the Local Group are:
A) big spirals like our Galaxy and M31. B) small spirals like M33 and the LMC. C) small irregulars like the Magellanic Clouds. D) active galaxies like Centaurus A. E) small ellipticals like the companions to M31 in Andromeda.
The work done by the centripetal force on an object with a mass of 1 kg moving with a constant velocity of 4 m/s into a circular path of radius 0.6 m for one full cycle is
A) 100.7 J B) 3.8 J C) 0 J D) 40 J E) 80 J
A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a motion picture was run backwards through the projector. d. any of the above occurred. e. (a) or (b) occurred, but not (c).