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A playground merry-go-round of radiusR=2.00m has a moment of inertiaI=255kg·m2and is rotating at9.0rev/min about a frictionless vertical axle. Facing the axle, a23.0kg child hops onto the merry-go-round and manages to sit down on its edge. What is the new angular speed of the merry-go-round?
rev/min
An average friction force of 4000 N impedes the car’s motion so that its speed at the bottom of the driveway is 3.8 m/s. Illustrate what is the length of the driveway?
A horizontal wire of 0.52 m carrying a current of 8.2 A is placed in a uniform external magnetic field. Determine the magnitude of the external magnetic field
Calculate the torque on the center of mass of the rod alone with respect to the pivot point.(in N*m)? Calculate the unknown mass.(in kg).
A charge of -0.50 µC is situated in an electric field of magnitude 9.0 × 104 N/C, directed horizontally to the right. Find the magnitude and direction of the force on it
A uniform electric field of magnitude 271 V/m is directed in the negative x direction. A +12.7 ?C charge moves from the origin to the point (x, y) = (15.5cm, 46.0 cm). What was the change in the potential energy of this charge?
The electric potential outside a charged conducting shpere is 200V, and 10.0 cm farther from the center of the sphere the potential is 150V. Determine the radius of the sphere
A coil of area 0.100 m2 is rotating at 70.0 rev/s with the axis of rotation perpendicular to a 0.200 T magnetic field. If the coil has 700 turns, what is the maximum emf generated in it
A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W. What is the comparable resistance of light string.
The surface tension of water is 0.0730 N/m. What is the height of the water in a capillary tube of diameter 1.00 mm
A narrow beam of light is incident normally on one face of equiangular glass prism of RI 1.45. Find the refractive index of this liquid and draw a diagram showing the path of rays
What is the tangential velocity of a satellite in a circular orbit 300km above the surface of the Earth, How long does the satellite take to complete one orbit
A thermos contains 165 cm3 of coffee at 85° C. To cool the coffee, you drop two 14-g ice cubes into the thermos. The ice cubes are at first at 0° C and melt completely. What is the final temperature of coffee? Treat the coffee as if it were water.
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