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A banana has 0.45 g of potassium. 0.0117% of that potassium is 4019K, an isotope with mass 39.963999u and a half-life of 1.277x109 years. What is the activity of the banana?
An object carries a charge of -6.6 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object
A U-236 nucleus fissions directly into Xe-138 and Sr-98 without the emission of neutrons. What is the fraction of the total kinetic energy released is carried by the lighter fragment
Astronauts use a centrifuge to simulate the acceleration of a rocket launch, What is the astronaut's tangential acceleration during the first 20.0s
A circular loop in the plane of the paper lies in a 0.55T magnetic field pointing into the paper. If the loop's diameter changes from 20 cm to 5 cm what is the magnitude of the average induced emf.
A 20t space craft leaving the dock of a space stationmakes a 12s engine burn. find the final speed of the space craft with respect to the station
High speed stroboscopic photographs show that the head of a 181 g golf club is traveling at 55.4 m/s, Find the speed of the golf ball just after impact
Two small objects, A and B, are fixed in place and separated by 2.97 cm in a vacuum. Object A has a charge of +2.16 microC, How many electrons must be removed from object A
A planet can have an atmosphere if the escape speed of the planet is 6 times larger than the thermal speed of molecules in the atmosphere. What is the radius of this object's orbit around the sun
Three identical point charges each of charge q are located at the vertices of an equilateral triangle, Find a symbolic expression for the electric potential at the center of the triangle
A 100 arrow is shot vertically from a bow whose efficient spring constant is 500. If the bow is drawn 75 before shooting the arrow, to what height does the arrow rise .
A 2.40cm × 2.40cm square loop of wire with resistance 1.10×10?2? has one edge parallel to a long straight wire. calculate the current in the loop
At what average rate does the force from the cable. A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 15 {rm m}/{rm s} as the hand is 2.0 {rm m} above the ground.
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