A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A) 200 N
B) 120 N
C) 160 N
D) 150 N
E) 0 N
C
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A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be
A) absorbed. B) totally reflected. C) partially reflected and partially transmitted. D) totally transmitted. E) totally polarized.
What does "carrying capacity" mean? Some have defined it as "the number that can be supported long term without damage to the environment." Is this a reasonable definition? Why or why not?
What will be an ideal response?
Three engines operate between reservoirs separated in temperature by 300 K. The reservoir temperatures are as follows:
Engine A: Th 5 1 000 K, Tc 5 700 K Engine B: Th 5 800 K, Tc 5 500 K Engine C: Th 5 600 K, Tc 5 300 K Rank the engines in order of their theoretically possible efficiency, from highest to lowest.
1.A, B, C 2.B, C, A 3.C, B, A 4.C, A, B