Determine Qnet for the toasting bread in problem 7.9, if the surroundings act as a gray surface with emissivity of 0.45 and temperature of 85ºC.
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The apparent visual magnitude of a star is 7.3 . This tells us that the star is
a. one of the brighter stars in the sky. b. bright enough that it would be visible even during the day. c. not visible with the unaided eye. d. very far from Earth. e. very close to Earth.
A large and a small person wish to parachute at equal terminal velocities. The larger person should
A) get a larger parachute. B) jump lightly. C) pull upward on the supporting strands to decrease the downward net force. D) jump first from the plane.
Life began in the sea
a. True b. False Indicate whether the statement is true or false
Series/Parallel Circuits: If V = 20 V and the battery is ideal, what is the current through R3 in the figure?
A. 0.050 A B. 0.20 A C. 1.0 A D. 4.0 A