If one could observe the individual atoms making up a piece of matter and note that during a process of change their motion somehow became more orderly, then one may assume which of the following in regard to the system?
a. increases in entropy
b. decreases in entropy
c. gains in thermal energy
d. positive work done on
b
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What creates a total lunar eclipse? a. The Sun passes completely through Earth's umbra. b. The Moon passes completely through Earth's umbra
c. The Moon passes through some of Earth's penumbra. d. The Earth passes completely through the Moon's umbra. e. The Earth passes through some of the Moon's penumbra.
An 84-kW AM radio station broadcasts at 1000 kHz . How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J ? s)
A) 1.3 × 1032 B) 2.9 × 1024 C) 6.3 × 1012 D) 1.4 × 1015
A uniform bridge span weighs 70.0 × 10^3 N and is 40.0 m long. An automobile weighing 15.0 × 10^3 N is parked with its center of gravity located 12.0 m from the right pier. What upward support force does the right pier provide?
a. 24.5 × 10^3 N c. 65.0 × 10^3 N b. 35.5 × 10^3 N d. 45.5 × 10^3 N
Disease frequency is usually expressed as prevalence rate.
a. true b. false