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A horizontal platform in the shape of a circular disk rotates one frictionless bearing about a vertical axle during the center of the disk. The platform has a radius of 4.34 m and a rotational inertia of 100 kg·m 2 about the axis of rotation. A 68.2 kg student walks slowly from the rim of the platform toward the center. If the angular speed of the system is 1.90 rad/s when the student starts at the rim, what is the angular speed when she is 0.940 m from the center?
The wheel of a racing car is rotating at 200 rpm at a given instant of time. In the next minute it makes 100 revolutions. The angular acceleration of the wheel is
a cessna aircraft has a lift-off speed of 120 kmh.a what minimum constant acceleration does the aircraft require if the
A charge per unit length given by λ(x) = bx, where b = 12nC/m2, is distributed along the x axis from x = +9.0 cmto x = +16 cm. If the electric potential at infinity is taken to be zero, what is the electric potential at the point P on the yaxis at..
An object of mass 4.0 kg is allowed to fall from rest under the force of gravity for 3.4 s. What is the change in its momentum
A kicker punts a football from the very center of the field to the sideline 37 yards downfield. What is the direction of the net displacement of the ball?
A 15.0 m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 60.0 angle with the horizontal. Find out the horizontal and vertical forces the ground exerts on the base of the ladder when an 800 N fire-fighter is 4.00m f..
An object is placed to the left of a lens, and a real image is formed to the right of the lens. How far from the lens is the object
Big Ben, the Parliament Building tower clock in London, has hour and minute hands with lengths of 2.70 m and 4.50 m and masses of 60.0 kg and 100 kg, respectively. Calculate the total angular momentum of these hands
A turntable must spin at 33.7 rpm (3.53 rad/s) to play an old-fashioned vinyl record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 3.0 revolutions, starting from rest? The turntable is a uniform disk ..
A toy cannon uses a spring to project a 5.24 gram soft rubber ball. The spring is originally compressed by 4.95 centimeter and has a force constant of 7.94 N/m. Determine at what point does the ball have maximum speed
during heavy rain a section of a mountainside measuring 3.8 km horizontally perpendicular to the slope 0.44 km up along
A mechanic's socket rolls off a 1.5 m high bench with an initial horizontal speed of 0.80 m/s. How far from the edge of the bench does the socket hit the floor
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