The type of heat transfer that occurs between warm food and the air in the room is principally
A)
convective.
B)
conductive.
C)
radiative.
D)
countercurrent.
E)
evaporation.
A
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A magnifying lens has a focal length of 10 cm. A person has a near point of 25 cm
(a) What is the magnification of the lens for that person when their eyes are focused at infinity? (b) What is the magnification of the lens for that person when their eyes are focused at their near point?
An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
A. There is no charge on either plate of the capacitor. B. The capacitor can be discharged by grounding any one of its two plates. C. Charge is distributed evenly over both the inner and outer surfaces of the plates. D. The magnitude of the electric field outside the space between the plates is approximately zero. E. The capacitance increases when the distance between the plates increases.
Rotational Dynamics: A uniform, solid, 100-kg cylinder with a diameter of 1.0 m is mounted so it is free to rotate about fixed, horizontal, frictionless axis that passes through the centers of its circular ends. A 10-kg block is hung from a very light thin cord wrapped around the cylinder's circumference. When the block is released, the cord unwinds and the block accelerates downward, as shown in the figure. What is the acceleration of the block?
Fill in the blank(s) with the appropriate word(s).
Consider the space time diagram below. Let the space time interval between events O and A be ?sOA, and let the space time interval between events O and B be ?sOB Which of these two space time intervals is larger? (Assume that the y and z coordinates of all these events are zero.)
A. 
B. 
C. 
D. There is no way to tell from this diagram.