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A student sits on a freely rotating stool holding two weights, each of mass 3.09 kg. When his arms are extended horizontally, the weights are 1.08 m from the axis of rotation and he rotates with an angular speed of 0.753 rad/s. The moment of inertia of the student plus stool is 3.09 kg·m2 and is assumed to be constant. The student pulls the weights in horizontally to a position 0.302 m from the rotation axis.
(a) Find the new angular speed of the student.(b) Find the kinetic energy of the student before and after he pulls the weights inward.
A narrow beam of white light is incident at 30^\circ on a 10.0 cm-thick piece of glass. The rainbow of dispersed colors spans 1.01 mm on the bottom surface of the glass. The index of refraction for deep red light is 1.513. What is the index of refrac..
The earth has a vertical electric field with a magnitude of approximately 100 V/m near its surface. What is the magnitudeof the potential difference between a point on the ground and pointon the same level as the top of the Washington Monument (555 f..
Three sheets of plastic have unknown indices of refraction. Sheet 1 is placed on top of sheet 2, what is the expected angle of refraction in sheet 3
A tank circuit in a radio transmitter is a series RCL circuit connected to an antenna. Find the minimum inductance of the tank circuit
The upper surface of a cube of gelatin, 7.0 cm on a side, is displaced 0.84 cm by a tangential force. what is the magnitude of the tangential force
The position of a particle is given by the expression x = (3.00 m) cos(4.00?t + ?/4), where x is in meters and t is in seconds. Determine the frequency and period of the motion
A knob on a turning table rotates circularly with a constant speed of 0.78 m/s in a cirlce with radius= 0.35m. What is the maximum acceleration of the shadow
A person lifts a 3.0 kg cement block a vertical distance of 1.24 m and then carries the block horizontally a distance of 11.90 m. How much work is done by the person in the process
A 0.142kg baseball has a terminal speed of 42.5m/s. If abaseball experiences a drag force of R=CV^2, what is the value ofthe constant C, What is its speed just before it hits the ground
A crate of potatoes of mass 8.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.72 and μk = 0.43. Find the frictional force (magnitude and direction) on the crate if the crate is sliding up t..
small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
A flat col enclosing an area of 0.1m2is rotating at 60 rev/s, with its axis of rotationperpendicular to a 0.20-T magnetic field. When the maximum induced voltage occurs what is the orientation of the col with respect to the magnetic field
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