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Unformatted text preview: 5.0 Ω. It is melted
down, and from the same volume of metal, a
wire is made that is four times longer than the
original wire. What is the resistance of the
new wire?
a. 1000 Ω
b. 560 Ω
c. 780 Ω
d. 920 Ω
81. A diverging lens with a focal length of 25 cm
has a magnification of 0.50. How far apart are
the object and the image?
a. 12.5 cm
b. 25 cm
c. 10 cm
d. 15 cm Page 12 of 15 ©Prep101
82. Three objects m1, m2, and m3 are suspended
from three massless and frictionless pulleys as
shown in the diagram. m1 is 6 kg, m2 is 2 kg,
and m3 is 3 kg. Find the tension of the string
when the system is set in motion (i.e. all
masses are moving). (This question is too hard
to be on the MCAT, but it is good practice) 84. The near point of a person is 50cm. The image
forms behind the retinal for images closer than
50 cm. To correct this problem, what
refractive power must a corrective lens have to
enable the eye to see an object at 10cm away
clearly? I
0 at p<pnear I
a.
b.
c.
d. 0 at p<pnear 11.3 N
12.1 N
13.5 N 15.7 N 83. A rod of 2.0 m length and square crosssection
(2.0 mm x 2.0 mm) is made of a material with
a resistivity of 6.0 x 10 Ωm. If a potential
difference of 0.5 V is established across the
ends of the rod, at what rate in W is heat
generated in the rod?
a. 3.0
b. 5.3
c. 8.3
d. 1.3 a.
b.
c.
d. 8.0 dpt
2.0 dpt
2.0 dpt
8.0 dpt 85. The atomic mass of 9Be is 9.012186 u. That of
4
He is 4.002604u, and of 13C 13.003354u.
Calculate the energy (in MeV) released by the
reaction: 9Be + 4He → 13C
a. 10.7 MeV
b. 12.3 MeV
c. 8.6 MeV
d. 15.7 MeV
86. If an object which is attached to a horizontal
spring is released from rest and distance +A
from equilibrium position of the spring, then
a. The formula E = 1/2 kx2 + mgx
describes the total energy of the object
b. The formula E = ½ kA describes the
maximum potential energy of the object
c. The formula E = ½ kA2 describes the
total energy of the object
d. The formula F = kx2 describes the
elastic force (restoring force) acting o...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.
 Spring '11
 Vallis
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