Where did Earth come from?
A) From gases gathered by the sun after the sun had already formed.
B) Earth was originally one of Jupiter's moons.
C) From the same collapsing gas cloud that gathered together to form the sun.
D) A passing star tore off part of the sun, and this part developed into Earth.
E) The Big Bang compressed matter into stars and planets such as Earth.
C
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If the velocity of an object is negative,
a. its speed is decreasing b. its velocity does not exist c. it is reversing direction d. it is moving in the direction labeled negative
Wave Characteristics: A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 2.0 × 107 m through space? (c = 3.0 × 108 m/s)
A. 0.15 × 10-2 s B. 15 ms C. 6.7 × 10-2 s D. 20 ms E. 25 ms
A refrigerator
A) produces cold. B) causes internal energy to disappear. C) transfers internal energy from inside to outside. D) transfers heat into cold. E) none of the above
What is the voltage across a 5.0-? resistor if the current through it is 5.0 A?
A) 100 V B) 25 V C) 4.0 V D) 1.0 V