Open spaces in ice crystals contribute to
A) decreased density.
B) increased density.
C) neither of these
Answer: A
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Radiation: Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to the power emitted by object A?
A. 1.7 B. 2.8 C. 81 D. 17 E. 21
Severe, long-term cooling periods during the Earth's history are known as
A) snowball Earth B) ice storms C) ice ages D) nuclear winters
Water can change phase to become ice by
A) extraction of energy. B) lowering the surrounding air pressure. C) both of these D) neither of these
An ac source of maximum voltage V0 = 30 V is connected to a resistor R = 50 ?, an inductor L = 0.6 H, and a capacitor C = 20 ?F
What is the maximum charge on the capacitor when the frequency of the source is set to the resonance frequency of the circuit? A) 1.0 mC B) 0 C) 2.1 mC D) 4.2 mC E) 8.4 mC