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Assuming you have a detection limit (lowest activity you can measure to a predetermined confidence level) of 20 Bq on you filter measuring system, how much air would you have to sample through your filter to be able to detect the naturally occurring concentration of Po-210 (assuming UNSCEAR values)? Assume that your filter has 100% sampling efficiency for Po-210, and that your sampling system can discriminate perfectly between Po-210 alphas and other radionuclide decay emissions.
A uniform 1.3-kg rod that is 0.76 m long is suspended at rest from the ceiling by two springs, one at each end of the rod. Find the angle that the rod makes with the horizontal
A thin uniform rod (mass = 0.75 kg) swings about an axis that passes through one end of the rod and is perpendicular to the plane of the swing. What is the maximum kinetic energy of the rod as it swings
A stunt man drives a car at a speed of 20m/s off a 30-m-high cliff, How far from the base of the cliff does the car land and What is the car's impact speed
A planet Z has a hole bored in it at its equator, and a shaft of light from it's star goes straight down that hole to the bottom, what is the circumference and radius of planet Z
A ball is whirled around in a horizontal circle of radius 0.4m. It's centripetal acceleration is 90 m/s2. Evaluate what is the speed of the ball
A boy places a picnic basket on the outer rim of a merry-go-round that has a radius of 6.3 meter and revolves once every 27 second. Find what is the speed of a point on that rim
Assuming the Earth's magnetic field averages about 0.50×10?4 T near Earth's surface, estimate the total energy stored in this field in the first 7.0km
A rectangular loop is located in a uniform magnetic field of magnitude 0.31 T directed perpendicular to the plane of the coil. what is the magnitude of the emf induced in the coil
A web page designer creates an animation in which a dot on a computer screen has a position of r? =[ 4.2cm +( 2.3cm/s2 )t2]i^+( 4.5cm/s )tj^
Starting from rest, a basketball rolls from the top of a hill to the bottom, reaching a translational speed of 5.85 m/s. Ignore frictional losses. What is the height of the hill
A centrifuge in a medical laboratory rotates at an angularspeed of 3450 rev/min. Find the constant angularacceleration of the centrifuge
An ebola patient must be sprayed at a distance with a disinfectant solution. How far must the sprayer be from the patient
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