6. label each description of heat transfer as radiation, conduction, or convection:
a. a radiator (heater) heating a room.
b. your hand holding an ice cube.
c. boiling a large pot of water.
d. the seatbelts in a car getting hot on a sunny day.
_ e. cooking pancakes on a griddle.
7. what is the difference between conduction and convection?
8. why can more water vapor be present in warm air than in cold air? (hint, think about how the air
molecules are spaced apart)
9. what causes air pressure?
10. as you are driving, you notice a fast moving convertible with a fabric top quickly passing your car. the
fabric roof of the convertible is bulging up, as if air was getting under the roof. describe how this
relates to air pressure. 13.
d. fo

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field. it is in the opposite direction from that of the original external field. it has a direction determined entirely by the charge on its surface. it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0