The actual depth of a shallow pool 1.00 m deep is not the same as the apparent depth seen when you look straight down at the pool from above. How deep (in cm) will it appear to be? (nwater = 1.33.)
A. 133
B. 75.2
C. 90.6
D. 117
E. 100
Answer: B
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Buoyancy: When a container of water is placed on a laboratory scale, the scale reads 120 g. Now a 20-g piece of copper (of density 8.9 g/cm3) is suspended from a thread and lowered into the water, not touching the bottom of the container. What will the scale now read? The density of water is 1.0 g/cm3.
A. 120 g B. 122 g C. 138 g D. 140 g
Which of these does Mars NOT have to help its case of past or present life?
A) occasional water flows, and past records of much larger ones B) a protective ozone layer C) carbon dioxide to provide some greenhouse warming D) a favorable distance from the Sun E) rover discoveries of sedimentary rocks and carbonates on the surface of Mars
For total internal reflection, light is ______________ and none is ______________
a. refracted; reflected b. refracted; transmitted c. reflected; transmitted d. transmitted; reflected
Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate?
a. 120 J c. 250 J b. -120 J d. 150 J