For a mass suspended on a spring in the vertical direction, the time for one complete oscillation will depend on:
a. the value for g (the acceleration due to gravity).
b. the distance the mass was originally pulled down.
c. the maximum speed of the oscillating mass.
d. the time doesn't depend on any of the above.
D
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A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward. The wires are parallel to each other and are 42 cm apart. Calculate the force on a 6.4 m length of one of the wires
(?0 = 4? × 10-7 T ? m/A) A) 5.1 × 10-4 N B) 2.2 × 10-4 N C) 5.1 × 10-6 N D) 8.0 × 10-5 N E) 8.0 × 10-7 N
Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into the galaxy's disk?
A) WIMPs are lightweight enough that they have expanded out into the halo. B) WIMPs were produced by stars in the early stages of galaxy evolution and therefore are only found in globular clusters in the halo. C) WIMPS rarely interact with other particles and therefore cannot settle into galactic disks. D) Shock waves from generations of supernovae have blown the WIMPs out into the halo. E) WIMPs annihilate when they come into contact with ordinary matter, such as stars.
Bands in Uranus' atmosphere, similar to those seen on the other jovian planets,
A) form due to Uranus' rapid rotation. B) do not exist due to Uranus' large axial tilt. C) do not exist because Uranus is too small. D) are formed by interactions with Uranus' moons and rings. E) are driven by Uranus' internal energy source.
Which of the following materials has the slowest speed of light?
A) water B) oil C) air D) flint glass E) diamond