An arco book arco is a registered trademark of Thomson Learning, Inc., and is used herein under license by Peterson’s. About The Thomson Corporation and Peterson’s

(B) 10 W
(C) 20 W
(D) 50 W
(E) It is impossible to calculate from the
data given.
50. A massless plank supports two objects, as
shown above. The labeled areas divide the
plank into sections of uniform length. At which
point could the plank be lifted without the
blocks causing rotation?
(A) A
(B) B
(C) C
(D) D
(E) E
51. A force is applied to an object through its cen-
ter of gravity. On the basis of this force, the
object possesses which of the following?
I.
Translational acceleration
II.
Rotational acceleration
III.
Rotational equilibrium
(A) I only
(B) III only
(C) I and III only
(D) II and III only
(E) I, II, and III
52. Several forces act at a single point, as shown
above. Assuming the length of the arrows is
proportional to the forces’ magnitude, which
of the following best represents the net force
at the point?
(A)
(B)
(C)
(D)
(E)
53. Ice has a specific heat capacity of 0.5 kcal/
kg
°C. If 10 kcal of energy is added to 10kg of
ice at –10
°C, the result would be
(A) 10kg of ice at –8
°C
(B) 10kg of ice at 0
°C
(C) 10kg of water at 0
°C
(D) 10kg of water at 1
°C
(E) 10kg of water at 10
°C
54. Air moving past a plane wing causes the wing
to lift. Which of the following may account
for such action?
(A) Air flow past the upper portion of the
wing is slower than air flow past the
lower portion of the wing.
(B) The pressure on the lower surface of the
wing is greater than the pressure on the
upper surface of the wing.