In ferromagnetic materials the small regions that act like tiny magnets are called
A)
conductors.
B)
domains.
C)
iron filings.
D)
spins.
E)
ferromagnets.
B
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To temper glass, the glass is initially heated to a temperature above the glass transition temperature but below the _________temperature.
Fill in the blank(s) with the appropriate word(s).
For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. As the temperature
of an object increases, the wavelength of the brightest light emitted a. increases. b. decreases. c. doesn't change. d. depends on the composition of the body. e. depends on the size of the body.
A steel ball bearing of mass m1 and speed of magnitude v1 has a head-on elastic collision with a steel ball bearing of mass m2 at rest. Rank the speed v1 of m1 relative to v2, the magnitude of the speed of m2, after the collision when i) m1>m2; ii) m1 = m2; and iii) m1
A. v1v2; v1>v2
Equilibrium: If the sum of the external torques on an object is zero, then the sum of the external forces on it must also be zero.
A. True B. False