What is the net power that a person loses through radiation if her surface area is 1.20 m2, if her emissivity is 0.895, if her skin temperature is 300 K, and if she is in a room that is at a temperature of 17°C?
The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4.
A) 60.3 W
B) 62.6 W
C) 65.7 W
D) 68.4 W
E) 64.8 W
Answer: B
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The graphs below show the phasors ?Vmax and Imax for five RLC series circuits. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax. Which graph represents a circuit where the capacitive reactance is greater than the inductive reactance?
A.
B.
C.
D.
E.
An object is placed 9.5 cm from a lens of focal length 24 cm. (a) Where is the image formed? (b) What is the magnification?
What will be an ideal response?
The focal length of the objective of a telescope is much longer than the focal length of the eyepiece
Indicate whether the statement is true or false
The heat required to change a substance from the solid to the liquid state is referred to as the
A) heat of fusion. B) heat of vaporization. C) heat of melting. D) heat of freezing. E) heat of condensation.