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A computer hard drive disk with a diameter of 3.5 inches rotates at 7200 rpm. The "read head" is positioned exactly halfway from the axis of rotation to the outer edge of the disk. Find the tangential speed in m/s of a point on the disk under the read head?
An RC series circuit has R = 71.0 \Omega and C = 550 nF. The series combination is connected across a 250 V (rms), 64 Hz power supply. Find the impedance of the RC combination
A charge of -3.00 uC is fixed in place. From a horizontaldistance of 0.0450 m, How far does the particle travel before its speed is zero
A particle of charge q and massm is moving with large velocity vand impact parameter d with respect to a smallplanar loop of wire of resistance R. find the direction of the final velocity
A cork 2.0 cm in radius is used to close one end of a tube whose other end is connected to a vacuum pump. How much force would be needed to pull the cork out
A 0.11- kg block on a wooden table is given a sharp blow with a hammer. The block then slides across the table to a stop. How far does the block go
In 1581, when Galileo was 17 years old, he noticed one morning at the Cathedral in Pisa (just next door to the leaning tower) that after the chandeliers were lit several of them oscillated back and forth with different amplitudes, How long was the..
A photon of wavelength 4.28 x 10^-2 nm strikes a free electron and is scattered at an angle of 32.0 degrees from its original direction. find the energy gained by the electron
A wooden block with equal sides of 4 cm is floating in water. If the density of the block is half the density of water, how far is it from the water to the top of the block?
The membrane that surrounds a certain type of living cell has a surface area of 4.5 x 10-9 m2 and a thickness of 1.1 x 10-8 m, how many such ions are present on the outer surface
A battery has an emf and an internal resistance r. When the battery is connected to a 20 ohm resistor, the current through the battery is 0.60A
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm (red) and 486 nm (blue). Light from a hydrogen lamp illuminates a diffraction grating with 460 lines/mm , and the light is observed on a screen 1.7 m b..
What is the angular velocity in rad/s . What is the least pressure obtained inside the bottle? What will happen when this pressure is reached.
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