The data points in this diagram represent the measured speeds and distances of various galaxies, and the solid line represents a best fit to these data. The trend indicated by the solid line is known as
A) Hubble's law.
B) Leavitt's law.
C) the inverse square law for light.
D) Kepler's third law.
A) Hubble's law.
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Instructions: On occasion, the notation 
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Starting from one oasis, a camel walks 25 km in a direction 30° south of west and then walks 30 km toward the north to a second oasis. What is the direction from the first oasis to the second oasis?
A. 21° N of W B. 39° W of N C. 69° N of W D. 51° W of N E. 42° W of N
A satellite is held in orbit by a 1 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
a. 1.0×108 J. b. 8.0×108 J. c. 1.0×1011 J. d. 0. e. 8.0×1011 J.
How long do sunspots typically last? Choose the best answer
a. an hour b. a day c. a week d. two weeks or a fortnight
A 50-kg air conditioner is placed on top of a concrete pad with a cross-sectional area of 3.0 m2 and 20 cm thick. What is the change in thickness of the pad? Young's modulus for concrete is 2.3 × 1010 N/m2
A) 1.4 × 10-9 m B) 2.8 × 10-9 m C) 1.4 × 10-8 m D) 1.4 × 10-7 m E) 2.8 × 10-8 m