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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science