Which of the following quantities are conserved in an isolated system?
a. mass b. energy
c. momentum d. all of the above
d
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The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere does the temperature of the sun change the most rapidly with distance?
a. 1,000 km
b. 2,300 km
c. 2,500 km to 4,000 km
d. 400 km
e. a and c
A steel rod (Es 5 210 GPa, dr 5 12 mm, ctes 5 12 3 1026/°C) is held stress-free between rigid walls by a clevis and pin (dp 5 15 mm) assembly at each end. If the allowable shear stress in the pin is 45 MPa and the allowable normal stress in the rod is 70 MPa, the maximum permissible temperature drop ?T is approximately:
(A) 14 8C
(B) 20 8C
(C) 28 8C
(D) 40 8C
Suppose you wanted to show the Sun on the same scale. About how big would it need to be?
A) 3.5 centimeters in diameter (the size of a golf ball) B) 35 centimeters in diameter (a little bigger than a basketball) C) 3.5 meters in diameter (about 11-1/2 feet across) D) 3.5 kilometers in diameter (the size of a small town)
Which of the following is(are) believed to be material that never collected into a single planet?
a. Asteroids b. Meteoroids c. Comets d. Interplanetary dust