What is the typical size of comets that enter the inner solar system?
A) 1 km
B) 10 km
C) 100 km
D) 1000 km
E) Comet sizes are unknown because their tails obscure the nucleus.
B
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After the New Horizons flyby, scientists concluded that Pluto has probably been geologically active within the past 100 million years or less. Why?
A. Large regions of the surface have very few impact craters. B. We see places where liquid water has been upwelling from as subsurface ocean. C. Smooth regions of the surface are made of nitrogen ice. D. The surface coloration can only be explained by active volcanism. E. Tall mountains are made of water ice.
Energy is released during a nuclear reaction due to a conversion between mass and energy. Mass is not conserved. The initial and final amounts are different. If a total of 1.0 gram of mass is "missing", how much energy has been released?
a. 9.0 × 10^11 J b. 9.0 × 10^17 J c. 9.0 × 10^15 J d. 9.0 × 10^13 J e. 9.0 × 10^16 J
According to Newton's Third Law, "action" and "reaction" forces must always act on the same object
Indicate whether the statement is true or false
By what factor is the self-inductance of a solenoid changed if only its number of coil turns, N, is doubled?
a. 8 c. 4 b. 1/2 d. 2