Radiation: What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 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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A 2-mol ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its environment. How much heat is received by the system?
a. ?20 J b. zero c. +10 J d. +20 J e. ?10 J
Which of the following statements is true of giant stars?
A) Supergiant stars are 1000 times smaller than the Sun's diameter. B) They have more surface area than main-sequence stars of the same temperature. C) They have very low luminosities because of their big size. D) Red dwarfs are giant stars that are hot and have high luminosities.
Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by the proton-proton chain
Indicate whether the statement is true or false
Wave Characteristics: In an electromagnetic wave in free space, the electric and magnetic fields are
A. parallel to one another and perpendicular to the direction of wave propagation. B. parallel to one another and parallel to the direction of wave propagation. C. perpendicular to one another and perpendicular to the direction of wave propagation. D. perpendicular to one another and parallel to the direction of wave propagation.