Concrete is sold by the cubic yard. What is the mass, in kilograms, of 1.00 cubic yard of concrete that is 5.00 times as dense as water? (1.00 m = 1.094 yd, a cubic meter of water has a mass of 1,000 kg, and density is mass per unit volume.)
A) 764 kg
B) 6550 kg
C) 2420 kg
D) 8730 kg
E) 3820 kg
E
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Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
The typical size of an interstellar dust grain is
A) 1 angstrom. B) 1 nanometer. C) 1 micrometer. D) 1 millimeter. E) 1 centimeter.
Our solar system lies about how many light-years from the center of the nuclear bulge of the Milky Way?
a. 2400 b. 28,000 c. 110 d. 4.3
The mass density of platinum is 21.4 × 103 kg/m3. A platinum wire with a radius of 0.500 mm, 1.20 m long, fixed at both ends has a frequency of vibration for its third harmonic equal to 512 Hz. What is the tension in the wire?
A) 4.00 kN B) 2.00 kN C) 2.82 kN D) 1.41 kN E) 1.00 kN