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Old TV sets utilized 10 watts of power to provide "instant on"
If the set was idle 16 hrs/day compute the ecological cost in kg/year of bituminous coal (30 MJ/kg) burned in a 35% efficient power plant.
Uranus requires 84 years to orbit the sun. Find Uranus's orbital radius as a multiple of Earths's orbital radius
A Sodium surface, which has a work function ? of 2.46 eV is illuminated with ? = 300nm light. Find the threshold frequency for Sodium
The generator at a power plant produces AC at 27,000 V. A transformer steps this up to 355,000 V for transmission over power lines. how many turns must there be in the output coil
A parallel-plate air capacitor is made from two plates 0.205m square, spaced 0.830cm apart. It is connected to a 120 V battery. What is the eletric field between the plates
Freud believed that certain troubling symptoms might be traced to painful unconscious memories. This led him to suspect that these symptoms resulted from.
A helicopter has blades of length 6 m, rotating at 4.1 rev/s about a central hub. If the vertical component of Earth's magnetic field is 4.5×10?5 T, FIND the maximum emf induced in the coil by Earth's magnetic field
A 55 g ball consists of a plastic spherical shell and a waterfilled core. What is the density of the plastic
a cyclotron designed to accelerate protons has an outer radius of 0.290 m. the protons are emitted nearly at rest from
suppose that after walking across a carpeted floor you reach for a doorknob and just before you touch it a spark jumps
What would be the minimum width of the mirror if you are willing to accept that you must use two eyes to see the full width of your face
A tennis ball gun launches tennis balls at 17.6 m/s . It's pointed straight up and launches one ball; 2.0 s later, What is the second balls' velocity at that point
A 38.00 kg girl is bouncing on a trampoline. All throughout a certain interval after she leaves the surface of trampoline, her kinetic energy decreases to 185J from 425J. How high does she rise all through this interval? Avoid air resistance.
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