An object that has zero resistance is a
a. semiconductor
b. superconductor
c. diode
d. transistor
e. positive ion
B
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To help keep buildings cool in the summer, dark colored window shades have been replaced by light colored shades. This is because light colored shades:
A. are more pleasing to the eye B. absorb more sunlight C. reflect more sunlight D. transmit more sunlight E. have a lower thermal conductivity
_______________ are fossilized remains of colonies of single-celled organisms that built up layer after layer of trapped sediments
Fill in the blank(s) with correct word
Slanting Surfaces Without Friction: A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A. 200 N B. 120 N C. 160 N D. 150 N E. 0 N
A tetherball is attached to a pole with a 2.0-m rope. It is circling at 0.20 rev/s. As the rope wraps around the pole, it shortens. How long is the rope when the ball is moving at 6.0 m/s?
a. 1.8 m b. 0.83 m c. 1.2 m d. 1.0 m