A pair of wires support a heavy painting. Tension in the wires is greater when they are
A) vertical.
B) not vertical.
C) the same regardless of the wire orientation.
D) none of the above
Answer: B
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Sunspot numbers follow a seven-year cycle
a. True b. False Indicate whether the statement is true or false
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
An up quark (u) has a charge +2/3, and a down quark (d) has a charge of -1/3. Which of the following describes a proton?
A) uuu B) uud C) udd D) ddd
Balance these equations
________ Image (g) + ________ Image (g) ? ________ NImage (g) A) 2, 2, 3 B) 2, 2, 5 C) 3, 3, 2 D) 3, 1, 2