Force F is applied at D along line DB and couple M is perpendicular to plane ABC. Assume magnitudes F 5 20 lb and couple M 5 50 in-lb. The moment MA (in-lb) due to both F and M is:
(A) 37i – 60j 1 22k
(B) 237i – 60j – 22k
(C) 237i – 60j – 22k
(D) 260i – 37j – 22k
(C) 237i – 60j – 22k
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Which answer below is not a statement of the second law of thermodynamics?
A. Real processes proceed in a preferred direction. B. Energy does not flow spontaneously by heat from a cold to a hot reservoir. C. The entropy of the universe increases in all natural processes. D. In theory, heat engines working in a cycle employ reversible processes. E. You cannot construct a heat engine, operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.
The process by which small debris condenses into planetesimals is ________
Fill in the blank(s) with correct word
A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum speed (3000 rpm) by an electric motor. The flywheel is a solid cylinder of mass 250 kg and radius 0.500 m (Icylinder = MR2/2). If the bus requires an average power of 10.0 kW, how long will the flywheel rotate?
a. 154 s c. 463 s b. 308 s d. 617 s
An atom with fewer electrons than protons is a
a. semiconductor b. superconductor c. positive ion d. negative ion e. none of the above