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
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A. currency B. connectivity C. interactivity D. delivery
The average power input to a series alternating current circuit is minimum when
A. there are only a resistor and capacitor in the circuit. B. there are only a resistor and inductor in the circuit. C. there is only a resistor in the circuit. D. XL = XC and the circuit contains a resistor, an inductor and a capacitor. E. there is only a capacitor in the circuit.
The coronal gas in the interstellar medium has very high temperatures similar to the Sun's corona
a. True b. False Indicate whether the statement is true or false
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