Which of the six objects shown below has the largest rotational energy? (All have the same mass.)
A. 
B. 
C. 
D. 
E. 
F. 
C.
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A 406.0 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 kJ/kg, and its melting point is 1357 K.) A) 2.49 × 105 kJ B) 1.66 × 1011 kJ C) 1.66 × 108 kJ D) 2.96 × 105 kJ
When a rigid body rotates about a fixed axis all the points in the body have the same angular displacement
Indicate whether the statement is true or false
A 6.5-g iron meteor hits Earth at a speed of 295 m/s. If its kinetic energy is entirely converted to the thermal energy of the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C° B) 57,100 C° C) 0.147 C° D) 384 C°
Which of the following radionuclides is used to date once-living material?
a. Rubidium-87 b. Potassium-40 c. Thorium-232 d. Carbon-14