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A student sits on a stool that is free to rotate about a vertical axis. He holds his arms extended horizontally with a 4.0-kg dumbbell in each hand. The instructor starts him rotating with an angular speed of 0.5 rev/s. Assume that friction is negligible and exerts no torque about the vertical axis of rotation. Assume also that the rotational inertia of the student remains constant at 5.0 kgm2 as he pulls his hands to his sides and that the change in rotational inertia is due only to pulling the dumbbells in. Take the original distance of the dumbbells from the axis of rotation to be 90 cm and their final distance 15 cm. Find the final angular speed of the student.
A simple pendulum 2.0m in length, is released with a push when the support string at an angle of 25 degrees from the vertical. What is the speed at the bottom of the swing
a 40g clay ball going southeast at a 45 degree angle at 4m/s collides with a 30g clay ball moving to the west at 3.0 m/s. find the speed and direction of the resulting blob of clay
A soccer playrer kicks a 0.5kg ball from rest to a speed of 9m/s during a 0.15s contact between his foot and the ball. What is the average force applied by the players foot during the kick
The plumbing in an old house uses lead pipes (which are now considered hazardous). what is the change in the length of the pipe
A small button placed on a horizontal rotating platform with diameter 0.328 will revolve with the platform when it is brought up to a rotational speed of 45.0 rev/min , provided the button is a distance no more than 0.141m from the axis. a)What is..
A football is kicked from ground level and lands 57.0 m downfield. What max heigh above the ground does the ball reach
Suppose a large conducting slab is polarized (one side is positive and the other is negative) What is the electric field force (E) inside the slab
The time constant of an RL circuit with L = 25 mH is five times the time constant of an RC circuit with C = 40 µF. What is the time constant of the RL circuit
A tuning fork vibrating at 516 Hz falls from rest and accelerates at 9.80 m/s2. How far below the point of release is the tuning fork while waves with a frequency of 489 Hz reach the release point? Take the speed of sound in air to be 340 m/s.
q1. a parallel-plate capacitor is formed from two 2.0 rm cm times 2.0 rm cm electrodes spaced 5.0 rm mm apart. the
The two wires of length 2m are 3mm apart and carry a current of 10 A dc. Calculate the force between these wires
Tarzan, who weighs 900N, swings from a cliff at the end of a 40.0 m vine that hangs from a high tree limb, What is the magnitude of the tension on the vine
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