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you need to use a monitor and lightweight cable to lift a 2.0 kg copper weight to a height of 3m. To do so, you've decided to use a 1000V power supply to charge a capacitor, then run the motor by letting the capacitor discharge through it. If the motor is 90 percent efficient (that is, 10 percent of the energy supplied to the motor is dissipated as heat), what minimum capacitance do you need?
A ferries wheel with radius 20 m which rotates counterclockwise, is just starting up. Find the magnitude of the passenger's acceleration at the instant
What is the total momentum of system after the collision.
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.11 m2 and whose thickness is 8 mm. Treat the wall as a slab of the insulating material Styrofoam whose area and thickness are 15 m2 and 0.10 ..
Consider the transitions 3d -->2p in hydrogen. Calculate the possible energies of emitted photons, taking into account the spin-orbital interaction. How many photon lines are there? Please show formulas and explain clearly
An electric field is E=(200 N/C) i in the region x>0 and E=( - 200 N/C) i in the region x
Europa, one of the moons of Jupiter, was discovered by Galileo in 1610. Europa has a circular orbit of radius 6.708 108 km and period 3.551 days. Find the mass of Jupiter
The edge of a cube consist of equal resistors of resistance R, that are joined at the orners, let a battery be connected to two opposite corners of a face of cube. what is the efective resistance.
A parallel-plate capacitor with circular plates of radius R is being charged. What is the radius R for the circular plate
Two trucks of equal mass collide at a 90 intersection. If the momentum of truck A is 9.50x10^4 kg km/h east and the momentum of B is 1.05x10^5 kg km/ north, what is the resulting momentum of the final mass
The experiment you did in lab is repeated, using a uniform metal bar that is 80.0 cm long instead of the meterstick. Since the bar is uniform, What is the mass of the bar?
Hearing damage may occur when a person is exposed to a sound intensity level of 90.0 dB (relative to the threshold of human hearing) for a period of 9.00 hours
For no apparent reason, a poodle is running at a constant speed of 3.40 m/s in a circle with radius 2.8m. Let v1 be velocity vector at time t1, and let v2 be the velocity vector at time t2.
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