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It has been proposed that large flywheels could be used to store energy. Consider a flywheel made of concrete (density 2060 kg/m3) in the shape of a solid disk, with a radius of13.7 meter and a thickness of 2.5 meter. If it's rotational kinetic energy is 693 MJ (6.93 x108 Joule), find what is the angular velocity of the flywheel?
Mrs. Smith has returned to work and feels well. She does not know why she needs to have periodic blood tests due to the warfarin. What is your explanation to Mrs. Smith.
For the motion from the initial free until the piece of wood comes to rest, what is the total amount of work completed by friction.
if 2.65 kg of copper are heated and the specific heat is given as 107 kj what is the temperature difference required
A sailboat runs before the wind with a consant speed of 4.2m/s in a direction 32 deress north of west. How far (a) west and (b) north has the sailboat traveled in 25 min?
Important information about Initial kinetic energy of the object Point A is situated at the bottom of a rough plane which is inclined at 45 degrees to the horizontal. A body of mass 0.5 kg is projected from A along and up the line of greatest slop..
A football quaterback runs 15.0 m staright down the playing field in 2.50s. what are the average velocities for the three intervals
how far from the edge f the dock can theboy move until the plank is just on the verge of tipping? Explain how can the boy test this conclusion without falling in the water?Explain
A windmill has an initial angular momentum of 8220 kg•m2/s. Find the torque acting on the windmill
1. an object is at distance s from a thin glass lens of focal length f. the lens is surrounded by air. the image is at
a gas cylinder holds 0.100g of at 180 degrees cand a pressure of 3.50atm. the gas expands adiabatically until the
An object is projected horizontally with a speed of 12 m/s and lands 120m from the launch site. What vertical height was it launched from
A Carnot heat engine takes 2000J of heat from the high temperature reservoir at 227 degrees Celsius, What is the Carnot efficiency
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