Most of the visible light we see coming from the sun originates from the
a. chromosphere.
b. photosphere.
c. corona.
d. sunspots.
e. magnetic field.
B
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An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
what angle will its new velocity make with the direction of the original velocity?
A. 14
B. 8.0
C. 5.5
D. 4.6
D. 4.6
A galvanometer with a resistance of 40.0 ? deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?
A) 25 k? B) 27 k? C) 29 k? D) 31 k? E) 35 k?
A polar bear of mass 200. kg stands on an ice floe 100. cm thick. What is the minimum area of the floe that will just support the bear in saltwater of specific gravity 1.03? The specific gravity of ice is 0.98
What will be an ideal response?
If one of the caissons of the Falkirk Wheel contained a sunken boat, resting on its bottom, and the other carried a floating boat, the wheel balance would
A) still be maintained. B) be upset and more energy would be needed for operation. C) render the machine useless. D) violate Archimedes' principle.