The iron and rocky cores found inside Jupiter and Saturn are closest in size to
A. the Moon.
B. Earth.
C. an asteroid.
D. the size of Jupiter and Saturn themselves.
Answer: B
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A steel plane truss is loaded at B and C by forces P 5 200 kN. The cross-sectional area of each member is A 5 3970 mm2. Truss dimensions are H 5 3 m and L 5 4 m. The maximum shear stress in bar AB is approx- imately:
(A) 27 MPa
(B) 33 MPa
(C) 50 MPa
(D) 69 MPa
Consider an orbit where rc = 1 AU and b = 2 AU. What kind of orbit is this?
A. Circular B. Elliptical C. Parabolic D. Hyperbolic
When a gas is so dense that most of its electrons are not free to change their energies, it is called _______________
Fill in the blank(s) with correct word
Velma, the space woman, orbiting at 100 miles above earth's surface, feels weightless because
A) she is in a vacuum. B) she is away from the pull of earth's gravity. C) she went on a diet. D) she is falling freely around Earth. E) Actually, she doesn't feel weightless.