It is possible with appropriately shaped external magnetic poles to create a situation where the effect of those poles does not vary with position along the SG axis. Imagine a small magnet placed in such a situation. What is the direction of the net force on the small magnet?
A. Upward.
B. Downward.
C. There is zero net force, no matter how the magnet is oriented.
D. The answer depends on the magnet’s orientation.
E. None of the above (explain).
C. There is zero net force, no matter how the magnet is oriented.
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During an adiabatic compression of an ideal gas
A) the internal energy of the gas remains constant. B) the temperature of the gas does not change. C) no heat enters or leaves the gas. D) no work is done on the gas. E) none of the above
A small, dense star the size of Earth that shines by only stored heat is a
A) white dwarf. B) blue straggler. C) black dwarf. D) brown dwarf. E) blue dwarf.
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ? K
A) 850 nm B) 907 nm C) 311 nm D) 483 nm E) 502 nm
The force an ideal spring exerts on an object is given by Fx = -kx, where x measures the displacement of the object from its equilibrium (x = 0) position. If k = 60 N/m, how much work is done by this force as the object moves from x = -0.20 m to x = 0?
a. -1.2 J b. +1.2 J c. +2.4 J d. -2.4 J e. +3.6 J