Which is a reasonable restatement of the second law of thermodynamics?
a. The orderliness of the universe increases.
b. All heat engines exhaust heat to their surroundings.
c. Force equals mass times acceleration.
d. Single-temperature heat engines can be built.
e. Heat sometimes flows spontaneously from colder to warmer objects.
b
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A square loop (L = 0.20 m) consists of 50 closely wrapped turns, each carrying a current of 0.50 A. The loop is oriented as shown in a uniform magnetic field of 0.40 T directed in the positive y direction. What is the magnitude of the torque on the loop?
A. 0.21 N ? m B. 0.20 N ? m C. 0.35 N ? m D. 0.12 N ? m E. 1.73 N ? m
Space itself is expanding
Indicate whether the statement is true or false
Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the
a. north or south celestial pole. b. celestial prime meridian. c. vernal or autumnal equinox. d. ecliptic.
The direction of heat flow between two objects depends on the amount of internal energy each of the objects has
Indicate whether the statement is true or false