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A photovoltaic cell can produce an average of 40 Wm^-2 (Watts permeter squared) of electrical energy if it is directly facing thesun at the equator. If a house has an electrical consumption of 75kW, what would be the required surface area of cells needed toprovide the power requirements of the household.
q1.a grinding wheel initially at rest is rotated with constant angular acceleration of 3.73 rads2 for 9.03 s. the wheel
A mass m is gently placed on the end of a freely hanging spring. The mass then falls 32.0 cm before it stops and begins to rise. What is the frequency of the oscillation
A small branch is wedged under a rock and rest on a smaller object. The smaller object is 1.0 m from the large rock and the branch is 4.0 m long. what force must be exerted on the smaller rock
A particle moves along the curve y=cos(x) from x=0 to x=?/2 under the action of the force F=(3xN)i+(4yN)j. Determine the work done by the force on the particle
An automobile starter motor will draw 180A from the 12V battery of a car for perhaps 2 seconds in the process of starting the gasoline engine. How much power does it use
A motorcycle is traveling up one side of a hill and down the other side. Determine the maximum speed that the cycle can have
ccccthe Zambesi river in Africa rushes over Victoria Falls at a rate of 25 x 10^6 gallons per minute. The falls are 108 m high, 1 gallon equals 3.785 x 10^-3 m^3 (or 0.1337 cubic foot), and the water has a density of 1.00 x 10^3 kg/m3 (each cubic foo..
A ladder 2.30 m long, weighing 226 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
A gray kangaroo can bound across level ground with each jump carrying it 9.2 from the takeoff point. what is the max height above the ground
When a 2.00-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.89 cm. If the 2.00-kg object is removed, how far will the spring stretch if a 1.00-kg block is hung on it
In the Bohr model of the hydrogen atom, an electron in the 6th excited state moves at a speed of 6.08 104 m/s, What is the effective current associated with this orbiting electron
In a certain reference frame, a particle with momentum of 7 MeV/c and a total energy of 10 MeV. What is the relative speed of the two reference frames
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