You push your physics book across your desk, leaving the book at rest on the desk at the end of the process. Which of the following best represents the overall energy conversion during this process?
A) kinetic to thermal
B) thermal to chemical
C) chemical to electromagnetic
D) chemical to thermal
E) elastic to thermal
D
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Ferromagnetic materials with a large _________are hard magnetic materials.
Fill in the blank(s) with the appropriate word(s).
The material that accretes onto a neutron star or black hole is expected to emit X-rays because
a. the material will produce synchrotron radiation. b. hydrogen nuclei begin to fuse and emit high energy photons. c. the material will become hot enough that it will radiate most strongly a X-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above
Pulsars cannot be spinning white dwarfs because
a. white dwarfs are not that common. b. white dwarfs are not dense enough. c. white dwarfs do not have magnetic fields. d. a white dwarf spinning that fast would fly apart. e. all of the above
An ideal gas at STP is first compressed until its volume is half the initial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of this is done while holding the temperature constant
If the initial internal energy of the gas is U, the final internal energy of the gas will be A) U. B) 2U. C) U/2. D) U/3. E) U/4.