A stone with a mass of 1.0 kg is tied to the end of a light string which keeps it moving in a circle with a constant speed of 4.0 m/s on a perfectly smooth horizontal tabletop. The radius of the path is 0.60 m
How much work does the tension in the string do on the stone as it makes one-half of a complete circle? A) 100 J
B) 3.8 J
C) 0 J
D) 40 J
E) 80 J
C
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Which reason best explains why both Venus's and Mars's atmospheres are primarily carbon dioxide, but Earth's is much less than 1% carbon dioxide?
A. Each planet has a significantly different surface temperature. B. Venus and Mars, being smaller than Earth, can't retain the same mixture of gases as Earth. C. Earth's rocks had much less carbon and oxygen in them. D. Plant life has existed on Earth for an extended amount of time.
How is the Moon's mantle different from Earth's?
A. The lunar mantle is too cold to form convection cells. B. The lunar mantle extends to the center of the Moon. C. The Moon's mantle has a higher density than Earth's. D. The lunar mantle has a different composition than Earth's.
A steel pipe (d3 5 104 mm, d2 5 96 mm) has a plastic liner with inner diameter d1 5 82 mm. The modulus of elasticity of the steel is 75 times that of the modulus of the plastic. Allowable stresses in steel and plastic are 40 MPa and 550 kPa, respectively. The allowable bending moment for the composite pipe is approximately:
(A) 1100 N?m
(B) 1230 N?m
(C) 1370 N?m
(D) 1460 N?m
An example of a heat mover is
a. a refrigerator. b. an air conditioner. c. a heat pump. d. all of the above. e. none of the above.