The overall fusion reaction by which the Sun currently produces energy is
A) 3 H ? 1 Li + energy.
B) 3 He ? 1 C + energy.
C) 4 H ? 4 He + energy.
D) 6 H ? 1 He + energy.
E) 4 H ? 1 He + energy.
E
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Some scientists speculate that super-Earths and water worlds might be habitable at greater distances from their stars than Earth-size planets. Why?
A) Their larger sizes might allow them to retain hydrogen atmospheres. B) Their larger sizes mean they might have more of the ingredients needed for life. C) For the water worlds, at least, they are certain to have oceans no matter how far they are from a star. D) These planets may retain more internal heat than Earth, which might drive greater geological activity.
What is one thing that electrical engineers do to minimize power loss between the plant and your home?
a. Increase the resistance in the wires between the two as much as possible. b. Use thinner wires. c. Coil the wire to increase the distance between the two. d. Lower the resistance between the two as much as possible. e. Build parallel circuits to take pressure off the generators.
Weight and g: ?MassRadiusOrbital radiusOrbital periodMoon A4.0 × 1020 kgunknown2.0 × 108 m4.0 × 106 sMoon B1.5 × 1020 kg2.0 × 105 m3.0 × 108 munknownMithra is an unknown planet that has two airless moons, A and B, in circular orbits around it. The table summarizes the hypothetical data about these moons. If you dropped a laser at the surface of Moon B, at what rate would it accelerate toward the ground? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.10 m/s2 B. 0.15 m/s2 C. 0.20 m/s2 D. 0.25 m/s2 E. 0.30 m/s2
What are two advantages of CCDs over photographic films for astronomy?
What will be an ideal response?