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Tag Archives: Physics

Shake and Bake


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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


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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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Electric Potential


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Which of the following statements regarding electric current is true?

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Acceleration Expression


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Which expression gives the acceleration of a 1kg mass on a frictionless inclined plane at 30o to the horizon, given that g = 9.8 m/s2?

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Kinetic Energy of a Race Car


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What happens to the kinetic energy of a race car if its speed is tripled?

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400 Meter Dash


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An athlete runs around a 400 meter track in 60 seconds, starting and finishing at the same place. What is her speed and velocity in m/s?

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Irresistible Resistors


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Three identical 12 ohm resistors are connected in parallel to a 8V battery. What is the total power dissipated in the circuit?

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Fluid Motion


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An object of mass 3 kg floats motionless in a fluid of specific gravity 0.8. What is the magnitude of the buoyant force? (Use g = 10 m/s2).

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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


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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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