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(a) Natural potassium contains 40K, which has a half-life of 1.277 x 109 y. What mass of 40K in a person would have a decay rate of 4180Bq?
(b) What is the fraction of 40K in natural potassium, given the person has 140 g in his body?
a plane is flying at 25 degree north of west at 190kmh and encounters a wind from 15 degree north of east at 45kmh.
Two long straight parallel wires are 19cm apart. Wire A carries 2.0-A current. Wire B's current is5.0A in the same direction, Determine the force per unit length on wire B due to wire A
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A 52.0 kg object falls from a height of 2.9 m to the ground. how many photons would be produced
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The 1.1 kg balls are attached to the ends of a thin rod of length 42.0 cm and negligible mass. The rod is free to rotate in avertical plane without friction about a horizontal axis through its center.
An electron is moving at a constant speed of 15 m/s on a circle of radius 2.2 m. Express the circumference of the circle C in terms of its radius R.
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