When a falling meteor is at a distance above the Earth's surface of 3 times the Earth's radius, what is its acceleration due to the Earth's gravity?
What will be an ideal response?
0.613 m/s2
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The moment reaction at A in the plane frame below is approximately:
(A) 11400 N ## m
(B) 22280 N # m
(C) 23600 N # m
(D) 16400 N m
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
A) her moment of inertia decreases and her angular speed increases. B) her moment of inertia decreases and her angular speed decreases. C) her moment of inertia increases and her angular speed increases. D) her moment of inertia increases and her angular speed decreases. E) her moment of inertia increases and her angular speed remains the same.
Newton discovered
A) gravity. B) that gravity is universal. C) neither of these
A neutron star has approximately the density of nuclear material. If a neutron star is the mass of the sun, 1.99 x 1030kg, what would be its radius? You may wish to use the relationship r=(1.2 fm)A1/3 together with the mass of a proton, 1.67 x 10-27kg, to estimate.
A. 12 km B. 19 km C. 13 km D. 9.8 km