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A typical American household uses 26.5 kW-hour of electricity per day, and that electricity is mostly supplied by fossil fuels. If we wanted to instead power a house by solar panels, which receive on average 370 W/m2 from the Sun each day and are 15.7% efficient (fraction of solar energy converted into useable electrical energy), what area of solar panels is needed to power an average American home?
A centrifuge in a medical laboratoryrotates at an angular speed of 3400rev/min. Find the constant angular acceleration of the centrifuge
Work of 2 Joules is done in stretching a spring from its natural length to 17 cm beyond its natural length. What is the force (in Newton's) that holds the spring stretched
Sam, whose mass is 74 kg, straps on his skis and starts down a 67-m-high, 20 ^\circ frictionless slope. Find Sam's speed at the bottom using work and energy
Compute diameter of a 5 meter long copper wire when its resistance is 0.01 Ohm
A concave shaving mirror has a focal length of 95 cm. find the image position of a cologne bottle placed in front of the mirror at a distance of 165cm. Calculate the magnification of the image. Is the image real or virtual? Is the image inverted o..
What will the electron's energy be if the hydrogen atom absorbs a photon with a wavelength of 109 nm?
a what is the period of a pendulum oscillating with an amplitude of 5.0 cm? l1.0 m m 0.5 kgb what is the maximum
A coil of 39 turns is in the shape of an ellipse having a major axis of 12.0 cm and a minor axis of 8.84 cm. The coil rotates at 139 rpm in a region in which the Earth's magnetic field is 64.5 ?T. What is the maximum voltage induced in the coil if th..
A long piece of wire with a mass of 0.100 kg and total length of 4.00 m is used to make a suare coil with a side of 0.100 m. Find the torque acting on the coil due to the magnetic force at equilibrium
The pressure difference between the pipes is monitored by the "U" shaped water manometer in which Δh = 11.2 cm. Find the volumetric flow in liters/s.
A small wooden block with mass 0.750KG is suspended from the lower end of a light cord that is 1.60m long. What is the initial speed of the bullet
At a carnival, you can try to ring a bell by striking a target with a 7.99-kg hammer. How fast must the hammer be moving when it strikes the target so that the bell just barely rings
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