How large is the estimated mass of a neutrino?
A) equal to the mass of an electron
B) equal to the mass of a proton
C) equal to the mass of a neutron
D) less than the mass of an electron
E) zero
D) less than the mass of an electron
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In a demonstration, a 4.00 cm2 square coil with 10000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
a. 7.5 × 10^?3 cm. b. 0.015 cm. c. 7.5 cm. d. 13 cm. e. 15 cm.
A 1-kg rock is suspended from the tip of a horizontal meterstick at the 0-cm mark so that the meterstick barely balances like a seesaw when its fulcrum is at the 25-cm mark. From this information, the mass of the meterstick is
A) 1/4 kg. B) 1/2 kg. C) 3/4 kg. D) 1 kg. E) none of the above
An intermediately wound barred spiral galaxy would be
A) BS2. B) BSE.5. C) SBb. D) S2B. E) SIrr.
If you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing
A) toward each other. B) apart from each other. C) away from the airstream.