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A 10 kg balloon is filled with helium. Its volume is 200 cubic meters. How much gold can it carry in air? How much gold can it carry in water?
In a diagnostic procedure a patient in a hospital ingest 80 mCi of gold-198 ( half life time is 2.7 days) what is the activity of the gold source in the end of a month ( after 30 days)
A 60g ball of clay is thrown horizontally at 10m/s toward a 1.8kg block sitting at rest on a frictionless hi surface. The clay hits and sticks to the block. What impulse does the block exert on the clay
A 70 kg man walks along a 40 kg horizontal plank which is 2 m long. The plank is attached to a hinge mounted to one wall, calculate the force provided by the hinge on the wall
A 75-kg person sits on a 3.7-kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.5 cm in diameter. Find out the pressure exerted on the floor by each leg of the chair; assume the weight is evenly distributed.
Waves moving on a lake have a speed of 2.8 m/s and a distance of 1.6 m between adjacent crests. Find the period of the wave motion
A uniform rope of mass m and length L is hanging straight down from the ceiling. A small-amplitude transverse wave is sent up the rope from the bottom end. Derive an expression that gives the speed v of the wave on the rope in terms of the distanc..
A speedboat moves on a lake with initial velocity vector v1,x = 9.69 m/s and v1,y = -2.99 m/s, Find the speedboat's final speed
A rifle with a weight of 40 N fires a 4.5-g bullet with a speed of 270 m/s. If a 775-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
A piston cylinder contains ar at 375kPA and 20 degrees celicus. Determine the heat added and the work done, using both Air Tables and Constant specific heat
If a 1.00-kHz sound source moves at a speed of 48 m/s toward a listener who moves at a speed of 29.5 m/s in a direction away from the source, what is the apparent frequency heard by the listener
A train is slowing down from 46 m/s to 12 m/s in 9.0 s. Assume constant acceleration. How far did it travel in this time
An aeroplane has wings with a surface area of 34 m2. The shape of the wings are such that air moving over the top of them travels 20% faster than the velocity of the air under the wing, what is the take-off speed of the plane
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