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External Forces

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Two objects are in motion, one has 1/2 the velocity of the other but twice the mass. External forces bring each mass to rest. Choose the correct statement.

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Law of Gravitation

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Consider the Law of Gravitation where the force of gravity F is:

F = G(m1m2/r2)

Which of the following represents the gravitational constant G in the fundamental dimensions of mass (M), length (L) and time (T)?

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Broadcast Frequency

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The length of the most effective transmitting antenna is equal to one-fourth the wavelength of the broadcast wave. If a radio station has an antenna 4 meters long then what is the broadcast frequency of the radio station? (the velocity of light in a vacuum is approx. 3.0 x 108 m/s)

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Increase in Motion

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An increase in the motion of molecules of a gas confined in a metal tank will be observed as an increase in:

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Taking A Swim

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A block of wood is held half immersed in the water. When released, it submerged to a greater degree but remained afloat. When the block was initially released, which of the following must have been true?

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Odd Man Out

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All of the following quantities are vectors EXCEPT one. Which one is the EXCEPTION?

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The Sum of All Forces

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If the sum of all the forces acting on a moving object is zero, the object will:

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Electron’s Trajectory

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An electron moving at constant velocity enters the area between two charged plates, as shown below. Which of the paths is most consistent with the electron’s trajectory after leaving the area between the charged plates?

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Fly Like An Eagle

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The cruising altitude of most planes is about 10,000 meters above sea level where there is less air above the plane pushing down, so the air pressure is lower (about 20 kPa outside compared to about 100 kPa atmospheric pressure at sea level). To keep everyone comfortable inside the plane, the cabin is pressurized to about 75 kPa. The passenger doors on a 747 are about 1 meter wide by 2 meters tall.

If a metric ton is 1000 kg, to pull the door open at 10,000 meters is equivalent to moving how many metric tons? (the acceleration due to gravity can be approximated as 10 m/s2)

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Scale In An Elevator

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A person stands on a scale in an elevator (true, it does not happen everyday but it is the sort of insanity that happens on the MCAT!). She notices that the scale is reading lower than her normal weight. Which of the following most reasonably describes the motion of the elevator?

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