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A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85 x 107 Bq. (a) What is the present activity in mCi? (b) How long ago did it actually have a 4.00-mCi activity?
A small current element located at the origin has a length of 2.00 mm and carries a current of 2.0 A in the +z direction. Find the direction and magnitude of the magnetic field due to this current element at the point (0.0, 0.3m, 0.3m)
An unstable atomic nucleus of mass 17 x10-27 kg initially at rest disintegrates into threeparticles. evaluate the velocity of the third particle
A satellite moves in a circular orbit around Earth at a speed of 4251 m/s. Determine the period of the satellite's orbit
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles, What is the initial magnitude of the acceleration of the alpha particles
The potential at location A is 376V. A positively charged particle is released there from rest and arrives at location B with a speed vB.
A ball of weight 75 N is attached to the ceiling by a 3.80-m mass less rope. What is the tension in the rope at this instant
If we attach a speedometer to a free falling object, by how much would its speed reading increase each second of the fall
A step-down transformer (turns ratio = 1:7) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. Evaluate what is the current in the primary coil
the overall volume compression ratio of a reversed carnot cycle working with air as a refrigerant is 10. the
A 1d collision occurs between a rocket ship and an asteroid. In the rest frame of the rocket ship, the asteroid is traveling at 0.81c. What is the momentum of the asteroid in the ships rest frame O
An air parcel with mass = 150 kg is traveling at 15 meters per second due east at 38 degrees North at an altitude of 5500 meters. What is the total force exerted on the air parcel
An ancient bone contains 47.5% as much 14~C~6 as a piece of living matter with an equal carbon content. How old is the bone
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