What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation?
a. His conclusion that the same laws applied to all heavenly bodies, not just the Earth and the Moon.
b. His conclusion that the same laws applied to all objects, no matter how small.
c. His conclusion that planets move in elliptical orbits around the Sun.
d. His connection of gravitation to his first law.
e. His connection of gravitation to Kepler's observations of planetary movement.
b
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Differential rotation of the Sun is
a. heating in the chromosphere and corona that makes them hotter than the photosphere. b. the magnetic dynamo inside the Sun. c. the equatorial regions of the Sun rotating more rapidly than the polar regions. d. the origin (and subsequent disappearance of) Sunspots first near the poles then closer to the Sun's equator as the Sunspot cycle progresses. e. the rotation of the Sun's southern and northern hemispheres in opposite directions.
What is the buoyant force on a 1.200 kg solid steel ball submerged in water? (density of steel is 7,900 
A. 1.136 N B. 1.245 N C. 1.489 N D. 1.566 N E. 1.750 N
A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2. What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
What will be an ideal response?
The pilot of an aircraft flies due north relative to the ground in a wind blowing 40 km/h toward the east. If his speed relative to the ground is 80 km/h, what is the speed of his airplane relative to the air?
A. 89 km/h B. 85 km/h C. 81 km/h D. 76 km/h E. 72 km/h