Solar energy is quite compatible for a major part of the U.S. because our major energy needs are for ________ energy
a. electrical b. thermal c. kinetic d. potential e. mechanical
b
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A rock on the ground is considered to have zero potential energy. In the bottom of a well, the rock would be considered to have
a. zero potential energy, as before. b. negative potential energy. c. positive potential energy. d. zero potential energy but would require work to bring it back to ground level.
Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
A. 12 rad/s2 B. 5.9 rad/s2 C. 8.4 rad/s2 D. 5.4 rad/s2 E. 17 rad/s2
Particle A (mass = m, charge = Q) and B (mass = m, charge = 5 Q) are released from rest with the distance between them equal to 1.0 m. If Q = 12 ?C, what is the kinetic energy of particle B at the instant when the particles are 3.0 m apart?
a. 8.6 J b. 3.8 J c. 6.0 J d. 2.2 J e. 4.3 J
The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.42 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4)
A) 6.30 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K