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Two Styrofoam balls with the same mass m = 7.7 10-8 kg and the same positive charge Q are suspended from the same point by insulating threads of length L = 0.92 m. The separation of the balls is d = 0.027 m. What is the charge Q?
What is the wavelength of the light in the glass
Kinetic energy KE has dimensions kg · m^2/s^2. It can be written in terms of the momentum p and mass m as KE=p^2/2m. (a) Determine the proper units for momentum using dimensional analysis. (Use the following as necessary: kg, m, and s.)
What friction torque is required to reduce its angular speed from 80.0 to 51 in 27.
Calculate the size of the average force. plan the force vectors with their tails at the left sphere
A loudspeaker of mass 22 {rm kg} is suspended a distance of h = 2 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has the length of l = 3.90 {rm m}.
Megan's mass is 27 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 3.6 m/s at the bottom of the slide. How much work was completed by friction on Megan? Imagine that air resistance is negligible.
A hockey stick is swung with an average angular acceleration of 1.5 rad/s2. What is an angular velocity of the stick when it strikes the ball at the end of 0.8 second swing.
A 246 kg wooden raft floats on a lake. When a 80kg man stands on the raft, it sinks 4cm deeper into the water. When he steps off, the raft vibrates for a while.
What are the velocities of the two people after the snowball is exchanged? Disregard friction between skate and the ice.
A steel beam that is 7.00m long weighs 330N. It rests on two supports, 3.00m apart, with equal amounts of beam extending from each end. Suki, who weighs 505 N, stands on the beam in the center and then walks toward one end. How close to the end can s..
A pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing.
A force vector has a magnitude of 595 newtons and points at an angle 39o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
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