One of the primary motivating forces behind our per capita reduction in energy use in the 1980's was _____________
a. a smaller population growth
b. higher oil prices
c. increased nuclear power costs
d. increased domestic oil discoveries
b
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Elastic Collisions: In the figure showing an isolated system, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is
A. perfectly elastic. B. partially inelastic. C. completely inelastic. D. characterized by an increase in kinetic energy. E. not possible because momentum is not conserved.
If the efficiency of a Carnot engine were to be 100%, the cool reservoirs would have to be
A) at absolute zero. B) at 0°C. C) at 100°C. D) infinitely hot.
What happens to the atomic number (Z) and the mass number (A) when a nucleus emits an alpha particle?
a. Z increases by 1; A is unchanged. b. Z is unchanged; A is unchanged. c. Z decreases by 2; A decreases by 4. d. Z decreases by 1; A is unchanged.
A 50.0-kg satellite is in a circular orbit about a planet. The potential energy of the orbit is -4.00 × 107 J. What is the speed of the satellite?
A) 1.26 km/s B) 2.11 km/s C) 1.44 m/s D) 3.22 km/s E) 894 m/s