The angular momentum of an isolated object can be changed only by
A. applying a torque.
B. changing its rotational inertia.
C. applying a force along the axis of rotation.
Answer: A
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Why is the very center of Earth's core a solid and not a liquid? a. There is less metal in the central core
b. The central core has a combination of gases with the metals. c. Accretion "seeded" Earth with a solid central core. d. The pressure at the central core raises the melting point of the metals higher than its temperature. e. The central core is a frozen block of water ice.
Your friend tells you that last night, they saw Mars high in the sky at midnight. You conclude that
A) Your friend must be mistaken: Mars can never be seen at midnight. B) Mars must be in retrograde. C) Mars must be at its closest distance from the Sun. D) Mars must be at its farthest distance from the Earth.
The mechanism by which planetary nebulae shine is very similar to that powering ________
Fill in the blank(s) with correct word
In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.4 × 1019 kg B) 4.8 × 1019 kg C) 1.2 × 1020 kg D) 2.4 × 1020 kg E) 4.8 × 1020 kg