Mild, short-term cooling periods during the Earth's history are known as
A) ice storms
B) nuclear winters
C) snowball Earth
D) ice ages
D
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A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction acted on the stone as it fell?
A) 4.1 N B) 2.9 N C) 0.13 kN D) 7.2 N E) 1.2 N
Dispersing light from a gas-discharge tube produces what type of spectrum?
a. Ultraviolet b. Line absorption c. Continuous d. Line emission
A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.0 m. What is the magnitude of the velocity of the puck just before it touches the ground?
A) 21 m/s B) 22 m/s C) 24 m/s D) 25 m/s E) 6.3 m/s
Which of these objects would exhibit diffuse reflection if you shone a light on it?
a. A cactus. b. A mirror. c. A still pool of water. d. A polished table top. e. A window.