When a material is found to have a definite volume but no definite shape, and when it assumes the shape of the container in which it is placed, what is the phase of the material?
a. Gas
b. Liquid
c. Plasma
d. Solid
b
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When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its magnetic domain becomes
A) smaller. B) zero. C) larger.
Calorimetry: A 44.0-g block of ice at -15.0°C is dropped into a calorimeter (of negligible heat capacity) containing 100 g of water at 5.0°C. When equilibrium is reached, how much of the ice will have melted? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 2.1 g B. 21 g C. 5.2 g D. 52 g E. 4.4 g
A nuclear reaction is said to be endothermic if the total kinetic energy is
A) less after the reaction than before. B) equal both before and after the reaction. C) greater after the reaction than before. D) zero after the reaction.
Millisecond pulsars rotate about ________ times per second.
A. 100 B. 1,000 C. 10 D. 1 million