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A 250 g, 24-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1600 rpm in 4.1 s?
Light of intensity 0.5 W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. how much light energy passes through in one minute
Two point charges are located on the y-axis as follows: one charge = -1.35 located at -0.555 , and a second charge = 3.10 at the origin. What is the direction of the total force
A 4.5 kg fish swimming 2 m/s swallows an absent minded 1 kg fish swimming toward it at a velocity that brings both fish to a halt at once after lunch. What is the velocity v of the smaller fish before lunch.
A candle is placed 37.8 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, Find the focal length of the convex mirror
A dockworker applies a constant horizontal force of 84.0\({\rm N}\) to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 12.5\({\rm m}\) in a time 4.80\({\rm s}\)
X rays with intial wavelegnth 6.75*10^-2nm undergo compton scattering, At which scattering angle is this wavelength observed
How much charge does the battery supply to each plate.
A cannon fires a cannon ball at 999.16 m/s in a straight line that passes directly over an observer's head. how far is the cannon from the observer
A certain superconducting magnet in the form of a solenoid of length 0.80 m can generate a magnetic field of 14.0 T in its core, Find the number of turns in the solenoid.
You hear a fire truck with a certain intensity, and you are about 1 mile away. Another person hears the same fire truck with an intensity that is about 10 times less. how far is the other person from the fire truck
A ball of circumference 72.7 cm and mass 605 g is forced to the bottom of a swimming pool and then released. After initially accelerating upward, Calculate the buoyant force on the ball
An object of mass 50.5 g is initially placed in boiling water so that it is at 101° C. Then the object is dropped into a calorimeter, Find the specific heat of the object
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