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A sample of a radioactive isotope is measured to have an activity of 240.8 mCi. If the sample has a half-life of 11 days, how many nuclei of the isotope are there at this time?
A spring is hung vertically and has a length of 50 cm when no mass is on it. What is its spring constant
the potential at location a is 419 v. a positively charged particle is released there from rest and arrives at location
A 45.0-kg girl is standing on a 169-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is the velocity of the plank relative to the surface of ice
The heating resistor is rated at 10 ? and 1 W. By how much was its power rating exceeded? (Remember, P=V2 /R.) Why didn't the resistor burn up?
A future geosynchronous space station will be used to collect solar energy. The energy is transmitted back to earth as an electromagnetic beam. how large are the station's solar panels, assume 100% efficiency
Two point charges, Q_1 = -6.1 mu C and Q_2 = 2.0 mu C, are situated between two oppositely charged parallel plates. The two charges are separated by a distance of x = 0.30 m. suppose that the electric field produced by the charged plates is unifor..
questiona car travels all along a straight line at a constant speed of 48.5 mih for a distance d and then another
A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative t..
A 300 gram mass moving at 7.5 cm/s eastward collides with a 500 gram mass moving at 5.0 cm/s westward on a horizontal low friction surface. Find the velocities of each mass after the collision
In a tractor-pulling contest, a 2500 kg tractor pulls a 5000 kg sledge with an acceleration of 0.61 m/s2. (The tractor rolls on its wheels; the sledge slides.), What is the force of the sledge on the tractor
a tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.3 ms. the car is a
A person whose eyes are 1.7 m above the floor stands in front of a plane mirror. How far above the floor should the bottom edge of the mirror be placed
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