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During normal operation, a computer's hard disk spins at 7200 rpm. If it takes the hard disk 4.40 s to reach this angular velocity starting from rest, what is the average angular acceleration of the hard disk in rad/s2?
A 4.8mH toroidal inductor has 140 identical equally spaced coils. If it carries an 11.5 A current, how much magnetic flux passes through each of its coils
A uniform conducting rod of length 28 cm has a potential difference across its ends equal to 13 mV (millivolts). What is the magnitude of the electric field inside the conductor
The mass of a string is 1.00 10-3 kg, and it is stretched so the tension in it is 120 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string?
A block of wood weighing 2N slides down a 37^0 inclined plane starting from rest and reaching 2 m/s. What is the kinetic coefficient of friction between the block and slide
Before starting this problem, review COnceptual Example 3. Suppose that hail described there bounces off the roof of the car with a velcity of +15 m/s. calculate the force exerted by the hail of the roof
A sledge loaded with bricks has a total mass of 17.9 kg and is pulled at constant speed by a rope inclined at 20.3° above the horizontal. What is the mechanical energy lost due to friction
when it is very far from the asteroid it will be traveling with speed 187 m/s. We have a large and powerful spring whose stiffness is 3.0 105 N/m. Explain how much must we compress the spring?
At the Earth's surface a projectile is launched straight up at a speed of 8.4 km/s. To what height will it rise
A thin 12 cm long solenoid has a total of 490 turns of wire and carries a current of 1.9 A. find the magnitude of the field inside near the center.
The air at the beginning of the compression stroke of an air-standard Otto cycle is at 0.095 MPa and 22°C, and the cylinder volume is 2800 cm3.
A capacitor consists of two concentric conducting spherical shells with radii R1 and R2 = 4.0R1. It has capacitance C = 4.0 pF, and is charged to a potential difference of 60.0 V. by what factor does the stored energy change
An astronomical telescope uses an eyepiece of power +80.000 D. what is the magnification of the telescope
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