When you touch a piece of ice with your finger, energy flows
A) from your finger to the ice.
B) from the ice to your finger.
C) both of these
D) none of the above
Answer: A
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A spaceship from another galaxy passes over the solar system directly above a radial line from the Sun to the Earth. (We measure that distance to be 1.5 × 1011 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80c, for which ? = 5/3. As measured on Earth it takes the spaceship 625 seconds to travel from the Sun to Earth. When a scientist in the spaceship measures the Earth-Sun distance and the time it takes her to travel that distance, she finds the results are, respectively
A. 9.0 × 1010 m; 375 s. B. 9.0 × 1010 m; 625 s. C. 1.5 × 1011 m; 625 s. D. 2.5 × 1011 m; 625 s. E. 2.5 × 1011 m; 1042 s.
What is an alpha particle?
a. A hydrogen atom. b. A helium atom. c. A hydrogen atom without its electrons (and therefore having one unit of positive charge). d. A helium atom without its electrons (and therefore having two units of positive charge). e. A deuterium nucleus (with one proton and one neutron).
The escape velocity from the Moon is 2.4 km/s. If an astronaut hits a golf ball such that it just reaches this speed, the ball will ________.
A. follow a very elliptical orbit around the Moon B. continue moving away from the Moon, never to return C. move away from the Moon, but return some time later D. either orbit the Moon or escape its gravitational pull, depending on the direction the ball is hit
To the nearest percent, what fraction of an iceberg is submerged? (?ice = 917 kg/m3, ?sea = 1.03 × 103 kg/m3.)
A. 95% B. 93% C. 91% D. 89% E. 77%