At a given point above Earth's surface, the free-fall acceleration is equal to What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 770 km
B) 970 km
C) 1500 km
D) 2000 km
E) 2400 km
A
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An elliptical galaxy could
a. evolve into an irregular galaxy when it has used up all of its gas and dust. b. be formed from the collision and merger of spiral galaxies. c. evolve from a single spiral galaxy when the spiral has used up all of its gas and dust. d. become a starburst galaxy if it were to move through the hot intergalactic medium of a cluster. e. evolve from an S0 galaxy if the S0 galaxy were to increase its rotation rate.
What is not true about the Milky Way bulge?
A: It's easiest to see its center by looking in radio, IR, or X-rays B: It's actually more like a bar (sorta elongated) C: Young stars are very close to the center D: Old stars are very close to the center E: It contains both young and old stars
The mass of 1000 cm3 of water is a kilogram
a. true b. false
A hollow aluminum shaft (G 5 27 GPa, d2 5 96 mm, and d1 5 52 mm) has an angle of twist per unit length of 1.88/m due to torques T. The resulting maximum tensile stress in the shaft is approx-imately:
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(D) 58 MPa