The strength of low-carbon steel used in automobile bodies is achieved by ______________forming.
Fill in the blank(s) with the appropriate word(s).
cold
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A 4 kilogram block of ice is removed from a freezer where its temperature was maintained at –20 degrees Celsius. How much heat does the ice absorb as it is warmed to –10 degrees? (The specific heat capacity of ice is 2,000 joules per kilogram degree Celsius.)
Which of the following best describes what we mean by the focal plane of a telescope?
A) It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope. B) It is the upper surface of the telescope's primary lens or mirror. C) It is the lower surface of the telescope's primary lens or mirror. D) It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view.
A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about the force F that the ramp exerts on the block perpendicular to the surface of the ramp?
A) F > mg B) F > mg cos ? C) F > mg sin ? D) F = mg cos ? E) F = mg sin ?
A particle is moving with a certain speed. Its speed and energy are being measured with respect to Earth. When the particle's speed doubles, the energy increases by a factor of 4. What was the original speed of the particle?
A) 0.447c B) 0.488c C) 0.523c D) 0.648c E) 0.800c