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A student sits on a rotating stool holding two 3.0 kg objects. When his arms are extendedhorizontally, the objects are 1.0 m from the axis of rotation, andhe rotates with an angular speed of 0.75 rad/s. The moment ofinertia of the student plus stool is 3.0 kg·m2and is assumed to be constant. The student then pulls the objectshorizontally to 0.20 m from the rotationaxis.
(a) Find the new angular speed of the student
(b) Find the kinetic energy of the student before and after theobjects are pulled in.
An oil slick on water is 120nm thick and illuminated by white light incident perpendicular to its surface. What color does the oil appear (what is the most constructively reflected wavelenth), given its index of refraction is 1.40?
An airplane pilot wishes to fly due west. A wind of 72.0 km/h is blowing toward the south, What is the speed of the plane over the ground
A car traveling initially at 7.0 m/s accelerates to velocity 12.0 m/s in 2.0 s. What is the average acceleration of the car
A pair of speakers separated by 0.700m are driven by the same oscillator at a frequency of 658 Hz. An observer, originally positioned at oneof the speakers, begins to walk along a line perpendicular to theline joining the speakers.
A 1.00 kg block of copper at 20.0°C is lowered into a large insulated container of liquid ammonia at its boiling point (-33.3°C). determine the mass of liquid ammonia that boils away before thermal equilibrium
a science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of
estimate the velocity of the groundwater flowing from a point 500 feet from a creek. the point is 50 feet above the
A car backs out of a driveway in front of a fire truck. The driver of the fire truck takes 0.18s to hit the brakes. How far away from the car was the fire truck when the driver first saw the car
A 1035 kg car carrying four 78 kg people travels over a rough "washboard" dirt road with corrugations 5.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude while its speed is 16 km/h. The car now ..
Compute the position, velocity vector and the distance attained by athlete in a long jump event.
From the shore of a frozen lake, Eli Manning throws a 2 kg football at a velocity of 20 m/s. What is their velocity immediately after they catch it
You decide to move your desk so your back is not facing the door. As you begin to move your desk, What is the coefficient of friction between the desk and the floor
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