Tag Archives: Physics

Shake and Bake

A racecar travels in a circular path around the Daytona 500 track. The radius of the circular track is doubled and the speed of the car does not change. The required force to maintain the car’s motion is:

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Getting Torqued

Water moves through a turbine in a dam, causing it to turn. The force of the water is 300 N, and the radius of the wheel is 20 m. What is the torque around the center of the wheel?

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Tilt Table

A tilt table test is used to verify if a patient has low pressure drops associated with syncope. The heart, of a horizontal patient, pumps blood at a mean arterial pressure of 90 mmHg (12 kPa). The patient faints as soon as the tilt table goes vertical, this means the blood acceleration equal the gravitational acceleration. If the heart rate does not increase to compensate for the change in angle, at what angle would the blood be pumping one half its horizontal pressure.

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Magnitude of the Force

Consider the following diagram which reveals a positive test charge that is located between two charged spheres, X and Y. Sphere X has a charge of +3Q and is located 0.6 meters from the test charge. Sphere Y has a charge of -3Q and is located 0.3 meters from the test charge.

If the magnitude of the force on the test charge due to sphere X is F, what is the magnitude of the force on the test charge due to sphere Y?

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Electric Charge

Three metal spheres X, Y and Z, are identical in size but carry differing electric charges of –Q, +2Q and -3Q, respectively. The first metal sphere X is brought into contact only with the sphere Y, and then X is brought into contact only with sphere Z. After X makes contact with spheres Y and Z, in the order described, the charge on sphere X is most consistent with which of the following?

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Direction of Magnetic Force

The direction of the magnetic force on a current carrying wire located in an external magnetic field is which of the following?

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External Forces

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

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

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

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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