When looking at your own reflection in a plane mirror, you notice that you can’t see all of your body. So, in order to see a larger fraction of your body
A. Can do nothing about it with this mirror
B. Need to raise or lower the mirror
C. Need to get farther from the mirror
D. Need to tilt the mirror
E. Need to get closer to the mirror
C. Need to get farther from the mirror
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A long steel beam with rectangular cross section of 40 cm by 60 cm is mounted on an insulating wall as shown in the following sketch. The rod is heated by radiant heaters that maintain the top and bottom surfaces at 300°C. A stream of air at 130°C cools the exposed face through a heat transfer coefficient of 20 W/(m2K). Using a node spacing of 1 cm, determine the temperature distribution in the rod and the rate of heat input to the rod. The thermal conductivity of the steel is 40 W/(m K).
GIVEN
Rectangular steel beam mounted on an insulating surface, heated top and bottom, with exposed face cooled by an air flow
FIND
(a) Temperature distribution in the rod (b) Rate of heat input to the rod
SKETCH
A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
A. right at the water surface. B. 53.3 cm above the water surface. C. exactly 80.0 cm above the water surface. D. 107 cm above the water surface. E. an infinite distance above the water surface.
A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force required to keep the car from sliding?
A) 9000 N B) 9810 N C) 300 N D) 900 N E) 3000 N
Which ray diagram is correct? The three rays in each diagram are distinguished by different types of lines. Hint: Check the behavior of each ray as it interacts with the lens
a.
A
b.
B
c.
C
d.
D
e.
E