A spar buoy is a cylindrical object that floats with its axis in the vertical direction

When it is disturbed a distance h from its equilibrium position, the magnitude of the restoring force is equal to ?ghS, where ? is the density of the water and S is the cross-sectional area of the cylinder. A certain spar buoy has a mass of 150 kg, a cross-sectional area of 2.50 m2, and is floating in seawater, ? = 1025 kg/m3. What is the frequency of ocean waves which will cause it to resonate? A) 12.9 Hz
B) 2.06 Hz
C) 7.19 Hz
D) 17.1 Hz
E) 2.72 Hz


B

Physics & Space Science

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The average power input to a series alternating current circuit is minimum when

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a. True b. False Indicate whether the statement is true or false

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Velocity Selector: A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T, what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg)

A. 5.9 × 103 V/m B. 1.9 × 105 V/m C. 6.0 × 105 V/m D. 7.2 × 106 V/m E. 1.1 × 105 V/m

Physics & Space Science