Cobalt is a radioactive substance used in nuclear medicine. You are given an old souce of radioactive cobalt with 4.2 ng of cobalt-60 written on it to analyze. You determine that the present diation of this sample is 182 Bq. What is the Age of this source in years? What quantity, in grams, of cobalt-60 is left in this source?

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The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p