Characteristics of Waves: What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?
A. 178 Hz
B. 1.78 kHz
C. 560 Hz
D. 5.6 kHz
Answer: C
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What does surface gravity measure?
A. the gravitational acceleration at a planet's or star's surface B. the tendency of a planet's surface to collapse under gravity C. the attraction between the surfaces of two massive objects D. how fast an object needs to go to escape a planet's gravity
In the Local Group, how might even the Milky Way become a victim?
What will be an ideal response?
When white light passes through a cool cloud of gas, we see
A) visible light. B) infrared light. C) thermal radiation. D) an absorption line spectrum. E) an emission line spectrum.
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2 b. 3.6 kg/m2 c. 3.1 kg/m2 d. 4.1 kg/m2 e. 1.6 kg/m2