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When a ceiling fan rotating with an angular speed of 2.75 rad/s is turned off, a friction torque of 0.120 N.m slows it to a stop in 22.5s . What is the moment of inertia of the fan?
A student sits on a rotating stool holding two 3.9-kg objects. When his arms are extended horizontally, Find the new angular speed of the student
A muon and an antimuon are moving in opposite directions with velocities of -0.4 c and 0.4 c, respectively. When they collide, they can annihilate each other and turn into two photons. Both muon and antimuon have a mass of 105.66 MeV/c2.
The bob of a simple pendulum that is 1.00m long is held so the sting is horizontal and just taut. How fast is the bob moving when the string makes a 30.0degree angle with the vertical
They stick together after the collision and are going 10 m/s after the collision. If they skid for 6seconds before stopping, how far did they skid?
A 29 kg board 3.2 m long is supported in a horizontal position at the two ends. A 77 kg worker stands 1.4 m from one end. What forces are exerted by the board on the two support points
A 3 kg block moves down a hill that makes a 40° angle with the horizontal direction, what is the magnitude of the acceleration of the block
three uniform objects: a rod, a right triangle, and a square. Their masses and their coordinates in meters are given. Determine the center of gravity for the three-object system
A straight wire carrying a 2.7 A current is placed in a uniform magnetic field of magnitude 0.25 T directed perpendicular to the wire. Find the magnitude of the magnetic force on a section of the wire having a length of 10 cm
A proton moving at 3.90 X 10^6 m/s through a magnetic field of magnitude 1.76 T experiences a magnetic force of magnitude 8.40 X 10^-13 N. What is the angle between the proton's velocity and the field
This hill slopes upward at a constant angle of 40 degree above the horizontal. The coefficient of static and kinetic friction between the hill and the rock are .75 and 0.20, respectively.
Proponents of astrology claim that the positions of the planets at the time of a baby's birth will affect the life of that person in important ways. Calculate the maximum force exerted on the baby by the planet Mars
The legend that Benjamin Franklin flew a kite as a storm approached is only a legend - he was neither stupid nor suicidal. what is the current through the water layer
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