Open spaces in ice crystals contribute to

A) decreased density.
B) increased density.
C) neither of these


Answer: A

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science