What is Kirchoff’s law?
What will be an ideal response?
Kirchoff’s law, as referred to radiation heat transfer, states that the emissivity of
a surface of a body is equal to the absorptivity.
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Ocean high tides occur on the far side of Earth because the moon pulls more on the land of Earth than on the ocean
a. True b. False Indicate whether the statement is true or false
The gravitational field at the moon due to the earth is (the mass of the earth is 
kg, the distance to the moon is 
m)
A. 
N/kg toward the earth.
B. 
N/kg away from the earth.
C. 
N/kg away from the earth.
D. 
N/kg toward the earth.
E. 
N/kg toward the earth.
Suppose the planet Uranus were much brighter in the sky, so that it was as easily visible to the naked eye as Jupiter or Saturn. Which one of the following statements would most likely be true in that case?
A) Its brightness would make it possible to read by starlight at night. B) Its gravity would cause the tides to be much higher than they actually are. C) Its slow motion through the sky would have led it to be named after the Goddess of Procrastination. D) The discovery that Earth is a planet going around the Sun would have come hundreds of years earlier. E) A week would have eight days instead of seven, despite the year length being unchanged.
A radioactive atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?
A) 96, 247 B) 94, 247 C) 96, 245 D) 100, 249 E) 100, 245