A well-clothed person walks into a large auditorium that is empty. If the auditorium walls are at an average temperature of 55ºF and the average surface temperature of the person’s clothes is 85ºF, estimate the net radiation heat transfer between the person and the auditorium walls. An average person can be assumed to have a surface area of 19.4 ft^2 (1.8 m2^).
What will be an ideal response?
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A resistor is connected to an ideal ac power supply. (a) The phase angle between the current and voltage is
A) 0 B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians. (b) The current in the resistor A) leads the voltage across the resistor by 90°. B) lags the voltage across the resistor by 90°. C) is in phase with the voltage across the resistor. D) the voltage across the resistor by 45°. E) lags the voltage across the resistor by 45°. (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A) It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle. What will be an ideal response?
At apogee, the Moon is at its farthest from the Earth and thus appears larger than normal. Because of this, it can produce total solar eclipses, but not annular solar eclipses
Indicate whether the statement is true or false
Which one of the following is a physical change?
a. Rusting of iron b. Fermenting of grape juice c. Souring of milk d. Sharpening a pencil
Which of the following are not relativistically invariant quantities?
a. the speed of light, c c. mass b. time d. energy