Which law of thermodynamics addresses the direction of heat flow?
A) First law
B) Second law
C) Third law
D) all of the above
Answer: B
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If you double the mass of fusion material in a hydrogen bomb, you quadruple the amount of energy generated
Indicate whether the statement is true or false
In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10^4 N/m and the pressure on the bottom surface is 9.0 × 10^4 N/m2 . If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?
a. 2.0 × 10^3 N b. 8.0 × 10^3 N c. 1.6 × 10^4 N d. 3.6 × 10^4 N e. 1.0 × 10^3 N
Today, we know that Newton's "laws" are
A) often incorrect when applied to molecular-sized objects. B) incapable of explaining the motions of the planets. C) in agreement with all known experimental evidence. D) no longer useful as scientific principles. E) often incorrect when applied to liquids.
A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60° below the horizontal?
a. 15 rad/s2 b. 12 rad/s2 c. 18 rad/s2 d. 29 rad/s2 e. 23 rad/s2