Neutron stars and black holes are formed by
A) the star formation process.
B) mass transfer in binary star systems.
C) novae.
D) type I supernovae.
E) type II supernovae.
E
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Weight and g: The earth has radius R. A satellite of mass 100 kg is in orbit at an altitude of 3R above the earth's surface. What is the satellite's weight at the altitude of its orbit?
A. 61 N B. 110 N C. 9000 N D. 16,000 N
Energy balance in the Sun refers to a balance between
A) the rate at which fusion generates energy in the Sun's core and the rate at which the Sun's surface radiates energy into space. B) the mass that the Sun loses each second and the amount of mass converted into energy each second. C) the force of gravity pulling inward and the force due to pressure pushing outward. D) the amount of energy the Sun radiates into space and the amount of energy that reaches Earth.
A battery has an internal resistance of 4.0 ?. Which of the following load resistors would have the most power delivered to it when connected across the battery?
A. 1.4 ? B. 2.0 ? C. 4.0 ? D. 8.0 ? E. 16 ?
How much energy would be required to accelerate a 77. kg professor from rest to 90% the speed of light?
A) 2.3 mc2 B) 0.30 m c2 C) 1.3 m c2 D) 0.41 m c2 E) 0.50 m c2