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A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 1.8 rad/s2. (a) How long does it take the discus thrower's speed to get to 3.5 rad/s? (b) How many revolutions does the thrower make to reach the speed of 3.5 rad/s? revolutions (c) What is the linear speed of the discus at 3.5 rad/s? (d) What is the tangential acceleration of the discus thrower at this point? (e) What is the magnitude of the centripetal acceleration of the discus thrown? (f) What is the magnitude of the discus's total acceleration?
A particle with radius r=5i+4k+3k has a force of F=3i-8j+5k acting on it. What is the torque in unit vector notation about the origin
A 1.0- kg mass is attached to a string wrapped around a shaft of negligible mass and having a 7.0- cm radius. How far apart are the masses of the dumbbell
How much work is completed by the system in this process. Determine the increase in entropy produced by the parachutist; assume the air temperature is 21 degrees C. How much work is completed by the system in this process.
You are trying to overhear a juicy conversation, but from your distance of 15m. It sounds like only an average whisper of 20 dB. So you decide to move closer to give the conversation a sound level of 60 dB instead. How close must you come.
A certain freely falling object requires 1.7s to travel the last 40m before it hits the ground. From what height above ground did it fall.
Estimate the number of water molecules in a 250cm^3 glass of water. Each molecule dimensions is about 3.0 x 10^-10m.
An object is recovered from under the sea. Its weight is measured to be 32.5 lb and its volume 3.3 ft3. What is the object's weight density
A jetliner is moving at a speed of 258 m/s. The vertical component of the plane's velocity is 85.8 m/s. find the magnitude of the horizontal component of the plane's velocity.
A long solenoid has 1400 turns per meter of length, and it carries a current of 2.2 A. Find the torque exerted on the coil
A 5.56 10-5 H solenoid is constructed by wrapping 62 turns of wire around a cylinder with a cross-sectional area of 8.30 10-4 m2 , Determine the change in the length of the solenoid.
After a 0.839 nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.48E+6 m/s. Through what angle was the photon scattered
A bag of cement weighing 275 N hangs in equilibrium from three wires as suggested in the figure below. Two of the wires make angles θ1 = 56.0° and θ2 = 42.0° with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2,..
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