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The system of masses in Figure 3 are connected by thin, light rods (that do not contribute to the angular momentum or rotational kinetic energy). The system is free to rotate about an axis through the center of the bottom rod of triangle and perpendicular to the page. The masses are rotated with an angular velocity of 15 rad/s. Find the rotational kinetic energy of the system and the angular momentum of the system.
Mary needs to row her boat across a 200 m-wide river that is flowing to the east at a speed of 1.1 m/s. Mary can row with a speed of 2.4 m/s. What is her speed with respect to the shore
A spherical 3-mi diameter comet impacts the earth with a velocity of 20 mi/s. Calculate the amount of heat released from the impact site
Two identical guitar strings are prepared such that they have the same length (1.91 m) and are under the same amount of tension. What is the wave propagation speed on the guitar strings
You are given a container with 25.7 g of hydrogen atoms. What is the total charge on the electrons in the container? what is total charge on protons?
For a particle of mass m and charge q moving in a circular path in a magnetic field B, Find angular momentum of a particle about the center of the circle
A particle's trajectory is described by x=(12t3?2t2)m and y =(12t2?2t)m, What is the particle's direction of motion, measured as an angle from the x-axis, at t=5.0s
A small steel sphere of mass 0.40kg is attached by a 5.0m long cord to a swivel pin set into the surface of a frictionless table top. What is the magnitude of the centripetal accerleration of the sphere
A Coast Guard cutter detects an unidentified ship at a distance of 23.0 km in the direction 15.0° east of north. Find the time required for the cutter to intercept the ship
Three point charges, -6.05 10-9 C, -9.40 10-9 C, and +7.25 10-9 C, are fixed at different positions on a circle. What is the radius of the circle
A 390 nm thick film floats on a puddle of water. When illuminated normally with 700 nm light there is no reflection, but 400 nm light is strongly reflected. What is the film's index of refraction
A dockworker applies a constant horizontal force of 70.0N to a block of ice on a smooth horizontal floor. how far does the block move in the next 4.50s
The current in a 100 watt lightbulb is 0.85 A. The filament inside the bulb is 0.25 mm in diameter. What is the elecron current in the filament
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