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A string trimmer is a tool for cutting weeds and grass; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. The string rotates at an angular speed of 45 rev/s and its tip has a tangential speed of 44 m/s. Determine what is the length of the rotating string?
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the mass of the star
It is found that, in a certain thermal reactor, fueled with partially enriched uranium, 13% of the fission neutrons are absorbed in resonances of U238 and 3% leak out of the reactor, both while these neutrons are slowing down; 5% of the neutrons that..
A long pole is used to lift a window. If a vertical lift of 85 N is needed to raise the window, elucidate what force must be exerted along the pole? Assume the pole makes an angle of 49° with the vertical wall.
An ideal fluid in a pipe of diameter 14cm is moving at 6.0 m/s. If the incompressible fluid density is 1.05g/cc, what is the flow rate in kg/s and what is the speed of flow if the pipe narrows to 4.0cm radius?
Illustrate what was the magnitude of the centripetal acceleration of the rock when it was on the string? (b) What was its speed when it was on the string?
A spaceship is emitting 500-nm light and traveling toward us at 10% the speed of light
A ball is launched from the top edge of a building 32.8 m high at a speed of 23.7 m/s at an angle of 15.0 degrees above the horizontal. Find the horizontal distance from the building at which the ball lands
A block of mass m1= 0.50kg placed in top of another block of mass m2= 0.80 kg, which rests on a frictionless surface. A horizontal force of 2.0N is applied to the lower block. Find the acceleration of the system of two blocks
What is an average magnitude of the Pointing vector 5.0miles from a radio transmitter broadcasting isotropically with an average power of 250-kW?
A 1.30-kg ball, moving to the right at a velocity of +4.52 m/s on a frictionless table, collides head-on with a stationary 8.40-kg ball. Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.40 m. obtain the magnitude of the initial acceleration of the third sphere
What is the work completed by the force of gravity.
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