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In the bohr model of the hydrogen atom, an electron is the 6th excited state moves at a speed of 60km/s in a circular path having a radius of 2mm. what is the effective current associated with this orbiting electron in µA?
If a person radiates about 66 W of power at room temperature, how long does it take for person to radiate away the energy acquired by consuming a 230 Calorie doughnut.
A small body of mass 0.28 kg is undergoing simple harmonic motion of amplitude 4.0 cm and period 0.10 s. What is the maximum value of the force acting on it? If the oscillations are produced by a spring, what is the spring constant?
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 deg. above the horizontal. How far does the jumper jump?
A 8760-kg car is travelling at 29.7 m/s when the driver decides to exit the freeway by going up a ramp, What is the magnitude of the average drag force exerted on the car
A cylinder of gas at room temperature (20°C) has a pressure p1. To what temperature in degrees Celsius would the temperature have to be increased for pressure to be 2.7p1.
Suppose that after a centrifuge in a medical laboratory is turned off, it continues to rotate with a constant angular deceleration for 10.40 s before coming to rest. How numerous revolutions did the centrifuge complete after being turned off.
A parallel combination of an 10 resistor and an unknown resistor R is connected in series with a 13 resistor and a battery. What is the unknown resistance R
What is change in the car's kinetic energy KEf - KEo from A to B. How fast will the father be moving.
A 5 kg fish is swimming at a speed of 1ms swallows a 1.00 kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is what.
A transmitter is operating at 4.00 kW of power. what is the average intensity of the signal 8.00 km from the transmitter
An energy storage system based on a flywheel (a rotating disk) can store a maximum of 3.2 MJ, What is the moment of inertia of the flywheel
Old naval ships fired 14 kg cannon balls from a 250 kg 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. In one design, a large spring with spring constant 2..
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