A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). To the nearest degree, at what angle relative to the normal to the interface of the two liquids is light totally reflected?
a. 78°
b. 88°
c. 68°
d. 49°
e. the critical angle is undefined
a
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The surface of Venus has been studied
a. using radar maps made from Earth. b. using radar maps made from satellites orbiting Venus. c. using spacecraft that have landed on the surface of Venus. d. all of the above e. only b and c
Two blocks in contact with each other are pushed to the right across a rough horizontal surface by the two forces shown. If the coefficient of kinetic friction between each of the blocks and the surface is 0.30, determine the magnitude of the force exerted on the 2.0-kg block by the 3.0-kg block
a.
15 N
b.
25 N
c.
11 N
d.
22 N
e.
33 N
A 6 cm diameter cooling coil tube has a surface temperature of 5ºC when air at 25ºC and 100 kPa flows around it at 10 m/s. Estimate the location on the tube where the maximum convection heat transfer coefficent occurs and determine the amount of heat transfer per unit area.
The graph shows 
versus t for an object moving along straight line. What is the average velocity from t = 0 to t = 11 s?
A. 25 
B. 36
C. 30
D. 21