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Q1. A heavy piece of hanging sculpture is suspended by a 146.0 cm long, 8.03 gm wire. When the wind blows hard, the wire hums at its basic frequency of 113.0 Hz. What is the mass of sculpture (in kg) assume that the local acceleration due to gravity is 9.80 m/s2?
Q2. If the average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second?
An electric motor rotating a workshop grinding wheel at the rate of 106 rev/min is switched off. Assume the wheel has a stable negative angular acceleration of magnitude 1.50 rad/s2.
An airplane flies eastward and accelerates uniformly. At one position along its path it has a velocity of 26.7 m/s. Find the airplane\'s acceleration
An object is launched with an initial velocity of 8.0 m/s to the horizontal from 327cm above the ground level. What is the final speed of the object
A 1.7 -V. dry cell can be tested by connecting it to a low-resistance ammeter; it should be able to supply at least 30 A. What is the internal resistance (in ohms) of the cell in this case
A dad pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 16rpm in 10.0s. What force is required at the edge
A 20 kg loudspeaker is suspended 2.0m below the ceiling by two cables that are 30 degrees from vertical. what is the tension in the cables
The turbines in a hydroelectric plant are fed by water falling from a 50-m height, what is the mass flowrate of water required to power a 200-watt light bulb
The electric field on the x-axis due to a point charge fixed at the origin is given by E=(b/x^2)i, Find the magnitude and sign of the point charge
A vertical straight wire carrying an upward 30?Acurrent exerts an attractive force per unit length of 5.5×10?4N/m, What current (magnitude) flows in the second wire
What is the shortest height a plane mirror must be so that a person who is 1.6 meters tall is able to see his or her whole body? plan a ray diagram to support your answer.
A rocket of mass 3.95 × 105 kg is in flight near earth's surface. Its thrust is directed at an angle of 54.7° above the horizontal, compute the direction of the rocket's acceleration
In an X-ray tube electrons strike a tungsten target (W or "wolfram") after being accelerated through a potential difference V0. Estimate the minimum value of V0 required to observe the Kalpha peak.
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