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A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 14rpm in 9.8s. Assume the merry-go-round is a uniform disk of radius 2.4m and has a mass of 690kg , and two children (each with a mass of 24kg ) sit opposite each other on the edge.
Calculate the torque required to produce the acceleration, neglecting frictional torque.
What force is required at the edge?
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it, What is the power of one laser pulse
A bucket filled with dirt of mass 22 kg is suspended by a rope that hangs over a pulley of mass 31kg and radius 0.15 m. everything is at first at rest.
An electric vehicle starts from rest and accelerates at a rate of 1.6 m/s2 in a straight line until it reaches a speed of 20 m/s. The vehicle after that slows at a constant rate of 1.4 m/s2 until it stops. (1) How much time elapses from start to s..
A gymnast of mass 60kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 for the acceleration of gravity.
What is the force between two balloons with a negative charge of 2.6 x 10-10C if the balloons are 10.0 cm apart?
A point charge is moved in an electric field. The potential changes from -87 V to +30 V between the initial and final position. The work done by the electric field is 156 J
The force of the wind on the sails of a sailboat is 410 N north. The water exerts a force of 240 N east. If the boat (including crew) has a mass of 330 kg, illustrate what are the magnitude and direction of its acceleration?
The triangular loop of wire in the drawing carries a current of I= 6.91 A. A uniform magnetic field is directed parallel to the side AB of the triangle and has a magnitude of 2.77 T.
A 1.0 kohm resistor is connected in series with a 10 mH inductor, a 30 V battery, and an open switch. at time t=0, the switch is suddenly closed. What are the voltage drops Vr and Vl 20.00 us after the switch is closed.
A water pipe is inclined 32.0° below the horizontal. The radius of the pipe at the upper end is 3.00 cm. If the gauge pressure at a point at the upper end is 0.117 atm, what is the gauge pressure at a point 2.65 m downstream, where the pipe has narro..
A uniform plank of length 5.8 m and weight 202 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the Illustrataing). To what distance x can a person who weighs 441 N walk on the overhanging part of t..
A proton moves at 7.50 X 10 ^7 m/s, perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius 0.800m.
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