If you push twice as hard against a stationary brick wall, the amount of work you do
A) quadruples.
B) doubles.
C) is cut in half.
D) remains constant but non-zero.
E) remains constant at zero.
E
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The magnetic dipole moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
A. r. B. v. C. vr. D. evr. E. mNvr.
Current: A jeweler needs to electroplate gold, having an atomic mass of 196.97 g/mol, onto a bracelet. He knows that the charge carriers in the ionic solution are singly-ionized gold ions, Au+, and has calculated that he must deposit 0.20 g of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol)
A. 9.1 mA B. 540 mA C. 33 A D. 1800 mA
What position shown is the moon at when we view it as full?
A. ‘above’ the Earth
B. On the far side of the Earth (relative to the Sun)
C. ‘below’ the Earth
D. On the side closest to the Sun
Which of the following is considered by scientists to be physically "real," but yet is not made of atoms or of other material particles such as protons, electrons, etc.?
A) the air B) neutron stars C) electromagnetic fields D) the ether E) Nonsense--we have known since Democritus that everything is made only of atoms and empty space.