On the Moon, the maria have fewer craters than the highlands
a. True
b. False
Indicate whether the statement is true or false
True
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A person weighs 146 pounds. The person's weight is (1 lb = 4.45 N)
A. 445 N. B. 500 N. C. 584 N. D. 650 N.
Who proposed a model with the Sun (rather than Earth) at the center of the solar system, which was then tested by the other people listed below?
a. Copernicus b. Tycho c. Kepler d. Galileo
What causes the large gaps in the asteroid belt (often called Kirkwood gaps)?
A) large asteroids that clear certain regions of the asteroid belt B) tidal forces from Jupiter C) tidal forces from the Sun D) orbital resonances with Jupiter E) the competing gravitational tugs of Mars and Jupiter
A cube of polymer that is 0.05 m on each side is to be held in place with a clamp. The clamp is designed to compress the 0.05-m-thick polymer by a constant amount of 0.0001 m to provide the clamping force. The maximum clamping force that is allowable is 1×104 N. To keep the polymer block securely clamped, the clamping force cannot fall below 0.5×104 N for one year, which is the expected life for this device. Assume that this polymer behaves as a Maxwell solid and that the viscous component is Newtonian.
(a) What is the maximum possible elastic modulus in the polymer that will result in the maximum allowable clamping force? (b) Assuming that a polymer is selected that has the highest allowable elastic modulus, what is the minimum allowable viscosity?