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41 A 330.-ohm resistor is connected to a 5.00-volt battery. The current through
the resistor is
(1) 0.152 mA
(2) 15.2 mA
(3) 335 mA
(4) 1650 mA
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Note that question 42 has only three choices.
42 Compared to the period of a wave of red light the period of a wave of green light
is
(1) less
(2) greater
(3) the same
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43 A hydrogen atom with an electron initially in the n = 2 level is excited further
until the electron is in the n = 4 level. This energy level change occurs because
the atom has
(1) absorbed a 0.85-eV photon
(2) emitted a 0.85-eV photon
(3) absorbed a 2.55-eV photon
(4) emitted a 2.55-eV photon
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44 Which graph best represents the relationship between resistance and length of
a copper wire of uniform cross-sectional area at constant temperature?
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45 The diagram below represents a block at rest on an incline.
Which diagram best represents the forces acting on the block?
(Ff = frictional force, FN = normal force, and Fw
= weight.)
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46 A 1.0 × 103-kilogram car travels at a constant speed of 20. meters
per second around a horizontal circular track. Which diagram correctly represents
the direction of the car’s velocity (v) and the direction of the centripetal
force (Fc) acting on the car at one particular moment?
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47 Which graph best represents the relationship between the magnitude of the electrostatic
force and the distance between two oppositely charged particles?
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