Acceleration is greater for a satellite when it is at the
A) apogee (farthest point).
B) perigee (closest point).
C) zenith.
D) same acceleration at all of the above places.
Answer: B
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It is possible for a medium-mass star to collapse and form a white dwarf, but no planetary nebula
a. True b. False Indicate whether the statement is true or false
Intensity: An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.80 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 8.5 × 10-4 W/m2 B. 1.2 × 10-3 W/m2 C. 1.7 × 10-3 W/m2 D. 6.0 × 10-4 W/m2 E. 4.2 × 10-4 W/m2
A scientific theory must produce testable predictions that are then evaluated when data are available. Describe at least two predictions of the nebular theory that can be tested through observations of other planetary systems.
What will be an ideal response?
The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 12 × 105 Pa B) 12 × 104 Pa C) 2.9 × 105 Pa D) 2.9 × 104 Pa