What is the first known human-made material?
(a) Ceramic
(b) Bronze
(c) Flint arrowheads
(d) Copper
(a) Ceramic
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A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?
A. 14 N B. 12 N C. 16 N D. 18 N E. 25 N
An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K. b. 0°C. c. 0°F. d. 0°R. e. the same as the temperature of the heat source.
What is the chance of three heads and two tails being the result of the toss of five coins?
1.1/32 2.5/32 3.5/16 4.1/2
The characteristic peaks in an x ray spectrum of an atom occur because
a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons