Acceleration: Under what condition is average velocity equal to the average of the object's initial and final velocity?
A. This can only occur if there is no acceleration.
B. The acceleration is constant.
C. This can occur only when the velocity is zero.
D. The acceleration must be constantly increasing.
E. The acceleration must be constantly decreasing.
Answer: B
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Latent Heats: A 771.0-kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar? The specific heat for copper is 386 J/kg ? K, the heat of fusion for copper is 205,000 J/kg, and its melting point is 1357 K.
A. 4.73 × 105 kJ B. 3.15 × 1011 kJ C. 3.15 × 108 kJ D. 5.62 × 105 kJ
Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the front of both vanes. What is the net torque on the vane assembly, about the vertical axis? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) 
A. 0.0 N ? m B. 6.0 × 10-12 N ? m C. 1.2 × 10-11 N ? m D. 1.8 × 10-11 N ? m E. 2.4 × 10-11 N ? m
Consider the fission reaction:
U + n ? 2 fission products + 2 n's (a) Estimate the energy released in the reaction. (b) If 3 neutrons had been released instead of 2, what energy would have been released?
Compared to Jupiter, the element ________ is notably less common in Saturn's atmosphere, perhaps condensing to fall toward the core as rain
Fill in the blank(s) with correct word