You are given a piece of pie straight out of the oven, so the crust and the filling are at the same temperature. You sample a piece of crust with no problem, but when you put a piece of filling in your mouth, you burn your tongue. Why?
What will be an ideal response?
Because the filling is moist while the crust is dry, so that the filling has a much greater heat capacity.
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What did the COBE satellite find regarding the smoothness of the cosmic background radiation?
What will be an ideal response?
An engine on each cycle takes in 40. Joules, does 10. Joules of work, and expels 30. J of heat. What is its efficiency?
What will be an ideal response?
A 4.2-kg object, initially at rest, "explodes" into three objects of equal mass. Two of these are determined to have velocities of equal magnitudes (5.0 m/s) with directions that differ by 90°. How much kinetic energy was released in the explosion?
a. 70 J b. 53 J c. 60 J d. 64 J e. 35 J
The Lewis symbol 
would be characteristic of which group?
a.
6A
b.
2A
c.
3A
d.
5A