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A uniform disk of radius 0.9 m and mass 3.2 kg is rotating about its center of mass. Its moment of inertia about its center of mass is I=1/2mR2. Its angular velocity as a function of time is given by ω(t)=3kt2/t13 where k = 5 rad and t1= 5 s. Find the magnitude of the net torque about the center of mass acting on the disk at t= 7 seconds.
A force of 4.7N is required to stretch a certain spring by 1.4cm, How far must this spring be stretched for its potential energy to be 0.025J
Equilibrium a meter stick has only two forces acting on it, of equal sizes at the ends that are in opposite directions. (I have magically turned gravity off.) Is the stick in equilibrium? Describe your answer.
a brother and sister are playing in the woods when suddenly the brother realizes that they are separated. the last
A solid ball has a weight of 3.0N. When it is submerged in water,it has an apparent weight of 2.7N. What is the density of the ball
A proton enters through a small hole in a metal plate with a speed of 8.00*10^5 m/s at an angle of 55.0°, How far will the proton travel, ?x, before it hits the metal plate
Three forces in the x-y plane act on a 7.20 kg mass: 13.10 N directed at 503.0o, 11.80 N directed at 130.0o, and 10.40 N directed at 224.0o. Calculate the magnitude of the acceleration
A beam of white light shines normally on the reflective side of a compact disk whose information tracks are 1.60 um apart. What colour light will be observed at an angle of 45 degrees with respect to the normal?
A 5.70-kg ball is dropped from a height of 12.0m above one end of a uniform bar that pivots at its center. The bar has mass 6.00kg and is 4.80m in length. At the other end of the bar sits another 5.10-kg ball, unattached to the bar. The dropped ball ..
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -17.30 eV. What is the energy of the first photon emitted
The two hemispherical pieces are electrically separated from each other but are left close together, so that the distance separating the two halves may be neglected. The upper half is maintained at Phi=Phi0 and the lower half is maintained at phi=..
in the park powerful magnets accelerate a car and its riders from rest to 45msabout 100mih at a time of 7.0s. the
A 3.00kg mass is pushed against a horizontal spring of force constant 23.0N/cm on a frictionless air table. What is the greatest acceleration of the mass
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