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A capacitor is charged to a potential of 13.0V and is then connected to a voltmeter having an internal resistance of 3.20 Ω. after a time of 3.50 s the voltmeter reads 3.0V. a) what is the capacitance? b)what is the time constant of the circuit?
An empty elevator has a mass of 365.2 kg, and the people inside have a total mass of 172.1 kg. What is the net force on the elevator
A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 240 kg · m2, What is the new angular speed of the merry-go-round
Batteries are rated in terms of ampere-hours (A · h). For example, a battery that can produce a current of 2.00 A for 3.00 h is rated at 6.00 A · h. At $0.0830 per kilowatt-hour, what is the value of the electricity produced by this battery
a football punter accelerates a football from rest to a speed of 11 ms during the time in which his toe is in contact
A disk-shaped space station 175 m in diameter spins uniformly about an axis perpendicular to the plane of the disk through its center. How many rpm (rev/min) must this disk make
A block of wood with volume V floats in water with 0.70V submerged. In oil the block floats with 0.85V of its volume submerged. calculate the density of the wood and oil
What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 8000km (about 1630km above the surface of the earth)?
A hollow sphere is rolling along a horizontal floor at 7.0 m/s when it comes to a 39^circ incline. How far does it go up the incline before coming to a stop and roll back down.
Old naval ships fired 14 cannon balls from a 240 cannon. It was very important to stop the recoil of the cannon, since otherwise heavy cannon would go careening across the deck of the ship.
A mass of 0.15 kg is pushed against a spring that has a force constant of k=130.0 N/m compressing the spring a distance of 7.0 cm. What is the energy stored in the spring-mass system
A 2 kilogram shell is fired from a tank with a force of 500 Newton. Estimate what is its acceleration
The output piston of a hydraulic press has a cross-sectional area of 0.24 m2. Find what force is applied to the input piston if it has a diameter of 4.6 centimeter
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