A waxing crescent moon is visible
a. near the eastern horizon just before sunrise.
b. near the eastern horizon just after sunset.
c. near the western horizon just before sunrise.
d. near the western horizon just after sunset.
e. from sunset until sunrise.
D
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A mass of 50. kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? (The Young's modulus for steel is 20 × 1010 N/m2.)
What will be an ideal response?
A solid steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the pressure is 15 MN/m2. The bulk modulus for this steel is 1.6 × 1011 N/m2. What is the change in the radius of the sphere?
A) -0.021 mm B) -4.2 mm C) -0.42 mm D) -0.19 mm E) -0.062 mm
Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound in air is 340 m/s, what is the smallest size insect they can detect?
If a volume of air is warmed, it expands. If a volume of air expands, it
A) warms. B) cools. C) neither of these