Page 398 - GMAT 2017b_Neatb

Mechanical Comprehension Test 2

pivot point
A B 102 pounds 68 pounds

73. Two ramps can be used to raise a heavy barrel up to a
platform. Neglecting friction, which ramp requires less
work to raise the barrel?
(A) Ramp A requires less work.
(B) Ramp B requires less work. 6 feet x
(C) They require the same amount of work.
(D) It is impossible to determine. 76. In the diagram, Vartan wants to balance two blocks on
either side of a lever. One block weighs 102 pounds
and the other weighs 68 pounds. If the 102-pound
block is 6 feet to the left of the pivot point, how far to
the right of the pivot point should the 68-pound block
be placed?
A B (A) 12 feet
(B) 6 feet
(C) 4 feet
(D) 9 feet

74. Pulleys A and B are identical in size and connected by a A B
belt. If pulley A rotates at 20 rpm clockwise, at what rate
and in what direction will pulley B rotate?
(A) 20 rpm, clockwise 77. Two ramps can be used to raise a heavy barrel up to a
(B) 20 rpm, counterclockwise platform. Neglecting friction, which ramp requires
(C) 40 rpm, clockwise less force to raise the barrel?
(D) 40 rpm, counterclockwise (A) ramp A
(B) ramp B
(C) It requires the same amount of work.
(D) It is impossible to determine.

36 feet
78. If a pulley is attached to the top of a flagpole, what is
the mechanical advantage of using the pulley to raise a
flag up the pole?
4 feet (A) 1
270 pounds
(B) 2
(C) 3
(D) 4

75. A 270-pound block is being pulled up an incline by a
pulley. The incline is 36 feet long and rises 4 feet.
Neglecting friction, how much force is necessary to
move the block up the incline?
(A) 30 pounds
(B) 270 pounds
(C) 40 pounds
(D) 144 pounds

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