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A 20-cm diameter circular saw blade has a mass of 0.79kg, distributed uniformly as in a disk.
a) What is its rotational kinetic energy at 4400 rpm?
b) What average power must be applied to bring the blade from rest to 4400 rpm in 3.5s?
To start a great night of doing physics homework, you sit down to pour yourself a good cup of coffee. What is the final temperature of coffee and mug once they come to thermal equilibrium
A block of weight 36.1 N is hanging from a rope. The tension in the rope is 48.5 N, pulling upward on the block. find the magnitude and direction of the acceleration of the block
Instead of using batteries, a certain type of flashlight has a built in hand pump which you can squeeze to generate the power necessary to light the bulb, what will be the potential difference across the light bulb
An observatory has an 8-inch Celestron telescope. Estimate the diffraction limit of this telescope. Estimate the minimum size a feature on the surface of the Sun must have to be resolved by this telescope.
A 125 kg mail bag hangs by a vertical rope 3.3 m long. A postal worker then displaces the bag to a position 2.2 m sideways from its original position, What horizontal force is necessary to hold the bag in the new position
Swift is a spacecraft that has a collecting area of 0.520 m2 to detect gamma-ray bursts (GRBs). find the amplitude of the magnetic field of the source
q.1. a child complains that her milk is too hot. it is indeed too hot at 90o c. her mother pours 70 g of cold milk at
Suppose after charging a 10.9 µF capacitor to 8 V, What voltage will your voltmeter read across those two capacitors connected in parallel
A solid spherical conductor of radius 15 cm has a charge Q = 6.5 nC on it. How much charge is there on the second sphere after the two spheres have been separated
An air core solenoid is used as an inductor in an oscillating LC circuit with a 1.50 \muF capacitor. The solenoid had a diameter of 6.40 cm, Find the number of turns in the solenoid
A stone with a mass of 0.700 is attached to one end of a string 0.8 long. The string will break if its tension exceeds 65.0 . The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed.
An object is 5.7 cm from a spherical concave mirror. If the image is 4.7 cm tall and 10 cm from the mirror, how tall is the object
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