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A merry-go-round of radius R=2.0m has a moment of inertia I=250kg m^2, and is rotating at 10rpm. A child whose mass is 25 kg and is at rest grabs onto the edge of the merry-go-round. The new angular speed (in rpm) of the merry-go-round is approximately?
A small rock with mass 0.12 is fastened to a massless string with length 0.80 to form a pendulum, find the tension in the string as it passes through the vertical
An electric field of magnitude 190 V/m is directed perpendicular to a circular planar surface with radius 6.39 cm, determine the magnitude of the magnetic field at a radial distance 11.1 cm away from the center of the circular area
A current of 74.8 mA exists in a metal wire, In what direction do the electrons travel with respect to the current
At a certain instant of time a particle with charge q = 12 microcoulombs is located at x=0, y=2m; its velocity at that time is v=30 m/s i. Find the magnetic field,B, at (a) the origin
An object is placed at a distance of 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?
A 17.0-m length of hose is wound around a reel, which is originally at rest. The moment of inertia of the reel is 0.490kg·m2, and its radius is 0.160 m. When turning, friction at the axle exerts a torque of magnitude 3.20 N·mon the reel.
The glow-in-the-dark dials on some watches and some keychain lights shine with energy provided by the decay of radioactive tritium, 3^1H. What is the speed of the emitted electron
A block of mass 10.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 2.60 104 N/m. determine how far has the spring been compressed
A mass m1 = 8.99 kg at rest on a horizontal frictionless surfaceand connected to a wall by a spring with k = 70.0N / m collides with a second mass m2 = 5.00 kg, What is the maximum compression of the spring
A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 56.0 m/s and returns the shot with the ball traveling horizontally at 42.0 m/s, What work does the racket do on the ball
Force F = (-9.0 N) i + (5.0 N) j acts on a particle with position vector r = (-5.0 m) j + (1.0 m) k. What is the torque on the particle about the origin
An object is dropped from rest from aheight of 40 million meters above surface of the earth. If there isno air resistance, what is its speed when it strikes the earth
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