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Mechanical Comprehension Test 2


                                                                 97. In the diagram, Robert wants to lift a 450-poun block
                                                                    using a lever. If the block is 3 feet from the pivot point
                                                                    and Robert is 9 feet from the pivot point. How much
                                                                    force must he apply to lift the block?
                                                                    (A) 450 pounds
                                                                    (B) 27 pounds
                                                                    (C) 150 pounds
                                                                    (D) 462 pounds
                                               Water
                                                                 98. Two men leave checkpoint 1 at the same time in the
                                                                    same direction. One travels at 25 mph and the other at
                                               Mercury              15 mph. How far apart are they after one hour?
                                                                    (A) 5 miles
                                                                    (B) 10 miles
                                                                    (C) 25 miles
          95. A lead plug is dropped into a beaker containing mercury   (D) 40 miles
                                                        3
              and water. Mercury is a liquid with a density of 8g/cm
                                         3                                               16 feet
              and water has a density of 1g/cm . If the plug has a
                            3
              density of 10g/cm , where will it settle in the beaker?
              (A) at the bottom of the beaker
              (B) in the middle of the mercury layer
              (C) in between the mercury and water layers                                 70 pounds
              (D) on top of the water layer                     x feet                                280 pounds




                                                                 99. A 280-pound block is being pulled up an incline by a
                                                                    pulley. The incline is 16 feet long. Neglecting friction,
                                                                    if 70 pounds of force is necessary to move the block up
                                                                    the incline, how tall is the incline?
                                    120 pounds
                                                                    (A) 4 feet
                                                                    (B) 8 feet
                                                                    (C) 16 feet
                                                                    (D) 2.5 feet





                                                                                                100 pounds

          96. Kemi is strong enough to pull a rope with 120 pounds of
              force. Using the pulley system shown here, what is the
              maximum weight she can lift?
              (A) 480 pounds
              (B) 360 pounds
              (C) 240 pounds
              (D) 120 pounds



                450 pounds
                                                                 100.Maria is strong enough to pull a rope with 100 pounds
                                                                    of force. Using the pulley system shown here, what is
                                                                    the maximum weight she can lift?
                                                                    (A) 50 pounds      (B)   100 pounds
                         3 feet        9 feet                       (C) 150 pounds     (D)   200 pounds

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