Stage II creep in metals begins when the strain-hardening rate is equal to the rate of _________.
Fill in the blank(s) with the appropriate word(s).
recovery
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What kind of a gas cloud can collapse and form stars?
A.) A very hot gas cloud that has a huge internal pressure can collapse and form stars. B.) A gas cloud that has a mass less than 10 solar masses can collapse and form stars. C.) The gas cloud must have a mass that exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud. D.) The gas cloud must have a mass that is smaller than the Jeans mass so that gravity overcomes the internal pressure in the cloud. E.) A black hole can collapse and form stars.
In general, the friction forces between one object and another act
A) in the same direction. B) in opposite directions. C) at right angles to each other. D) none of the above
As an object moves from point A to point B only two forces act on it: one force is conservative and does ?70 J of work, the other force is nonconservative and does +50 J of work. Between A and B, a. the kinetic energy of object increases, mechanical energy increases
b. the kinetic energy of object decreases, mechanical energy increases. c. the kinetic energy of object decreases, mechanical energy decreases. d. the kinetic energy of object increases, mechanical energy decreases. e. None of the above.
The threshold wavelength for photoelectric emission of a particular substance is 500 nm. What is the work function (in eV)?
a. 4.2 b. 4.0 × 10^?19 c. 4.0 × 10^?10 d. 2.5 × 10^?19 e. 2.5