An astronaut's normal weight it 600 newtons. How much will she weigh while orbiting in a satellite at 12,000 kilometers [two earth radii] above the surface of Earth?
A) zero B) 300 newtons C) 200 newtons D) 67 newtons E) 150 newtons
D
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Cepheid variable stars are classified as either ____
a. Type A or Type B b. Type I or Type II c. Class A or Class B d. Class I or Class II e. Type C or Type R
RLC Circuits: A resistance of 55 ?, a capacitor of capacitive reactance 30 ?, and an inductor of inductive reactance 30 ? are connected in series to a 110-V rms, 60-Hz power source. What rms current flows in this circuit?
A. 2.0 A B. less than 2.0 A C. more than 2.0 A D. none of the given answers
When a formal definition of a planet in the solar system was adopted, Pluto was reclassified as a dwarf planet. What characteristic of planets does NOT describe Pluto?
A) Planets orbit the Sun. B) Planets are approximately spherical. C) Planets have cleared the neighborhood around their orbit. D) Planets orbit in ellipses with low eccentricity. E) Planets orbit in or very near the ecliptic plane.
A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The moment of inertia of the rod about the pin is 2.0 kg/m2.)
a. 3.5 rad/s b. 2.7 rad/s c. 3.1 rad/s d. 2.3 rad/s e. 1.6 rad/s