(A) 0.1x
(B) 110x
(C) 1000x
(D) 10000x
(E) It is impossible to calculate from the
data given.
69. A charge of 5.0
× 10
∠9
C is in a uniform elec-
tric field of 5.0
×10
4
N/C. A force of magni-
tude 2.0
× 10
–4
is applied but is unable to move
the charge against the electric field. How much
work is performed on the charge?
(A) 0 J
(B) 1.0
× 10
–12
J
(C) 5.0
× 10
–8
J
(D) 2.5
× 10
–4
J
(E) 5.0
× 10
–4
J
70. An impulse produced by a 50N force on an
object is 2.5NS. How long is the force act-
ing on the object in order to produce such
an impulse?
(A) 0.05 seconds
(B) 0.5 seconds
(C) 3.0 seconds
(D) 20.0 seconds
(E) 125.0 seconds
71. The reaction shown above is an example of
which of the following nuclear processes?
(A) Alpha decay
(B) Fusion
(C) Fission
(D) Beta decay
(E) Nuclear binding reaction
72. A current of 2 amperes flows through a conduc-
tor with a resistance of 6 ohms. The current flows
for 2 seconds. How much heat energy develops
in the conductor as a result of current flow?
(A) 12 J
(B) 24 J
(C) 48 J
(D) 96 J
(E) 144 J
73. A person rotates with extended arms on a turn-
table. Assume dissipative forces are negligible.
The person’s arms are then folded and held
close to his chest. Which of the following cor-
rectly describes the result of such an action?
(A) The person increases his rotational inertia.
(B) The person’s angular velocity increases.
