A 10 kg object dropped from a certain window strikes the ground in 4.0 s. Neglecting air resistance, a 5 kg object dropped from the same window strikes the ground in
A. 8.0 s.
B. 1.0 s.
C. 2.0 s.
D. 4.0 s.
Answer: D
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Explain what the granulation of the solar surface is related to
What will be an ideal response?
Spiral arms appear bright because ________
A) they contain far more stars than other parts of the galactic disk B) they are the only places where we find stars within the disk of the galaxy C) they contain more molecular clouds than other parts of the disk D) they contain more hot young stars than other parts of the disk
As an electron moves in the direction the electric field lines
A) it is moving from low potential to high potential and gaining electric potential energy. B) it is moving from low potential to high potential and losing electric potential energy. C) it is moving from high potential to low potential and gaining electric potential energy. D) it is moving from high potential to low potential and losing electric potential energy. E) both its electric potential and electric potential energy remain constant.
A metal rod of length L in a region of space where a constant magnetic field points into the page rotates about an axis through its center at constant angular velocity ?. The ends, A and E, make contact with a split ring that connects to an external circuit. The current in the external circuit of resistance R has magnitude
a.
0.
b.
