When an object absorbs as much as it radiates
A) it remains at about the same temperature.
B) it is a net absorber.
C) it is a net radiator.
D) none of the above
Answer: A
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Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about
A) 0.2 g. B) 0.3 g. C) 0.4 g. D) 0.5 g. E) greater than 0.5 g.
Matter composed in such a way that all samples of
it have a fixed composition and identical properties is classified as a) a pure substance. b) a mixture. c) an allotrope. d) a saturated solution.
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision.
A. 15 m/s B. 7.0 m/s C. 8.0 m/s D. 23 m/s E. 11 m/s
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 DT is approximately:
(A) 14 8C
(B) 20 8C
(C) 28 8C
(D) 40 8C