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41 Which circuit diagram shows voltmeter V and ammeter A correctly positioned to
measure the total potential difference of the circuit and the current through each
resistor?
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42 A monochromatic ray of light (f=5.09×1014 hertz) traveling
in air is incident upon medium A at an angle of 45°. If the angle of refraction
is 29°, medium A could be
(1) water
(2) fused quartz
(3) Lucite
(4) flint glass
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43 What is the total electrical energy used by a 1500-watt hair dryer operating
for 6.0 minutes?
(1) 4.2 J
(2) 250 J
(3) 9.0 × 103 J
(4) 5.4 × 105 J
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44 Which combination of quarks would produce a neutral baryon?
(1) uud
(2) udd
(3) uud
(4) udd
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45 A 12.0-meter length of copper wire has a resistance of 1.50 ohms.
How long must an aluminum wire with the same cross-sectional area be to have the
same resistance?
(1) 7.32 m
(2) 8.00 m
(4) 19.7 m
(3) 12.0 m
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46 A 0.500-meter length of wire with a cross-sectional area of 3.14
× 10–6 meters squared is found to have a resistance of 2.53
× 10–3 ohms. According to the resistivity chart, the wire could
be made of
(1) aluminum
(2) copper
(3) nichrome
(4) silver
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Base your answer to question 47 on the cartoon below and your knowledge of physics.
47 In the cartoon, Einstein is contemplating the equation for the principle that
(1) the fundamental source of all energy is the conversion of mass into energy
(2) energy is emitted or absorbed in discrete packets called photons
(3) mass always travels at the speed of light in a vacuum
(4) the energy of a photon is proportional to its frequency
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