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An archeological specimen containing 9.7 g of carbon has an activity of 1.2 Bq. How old (in years) is the specimen?
Calculate the angular velocity? of an electron orbiting a proton in the hydrogen atom, given the radius of the orbit is 0.500x10-10 m . You may assume that the proton is stationary and the centripetal force is supplied by Coulomb attraction.
A pinada, practically in a shape of a slender thin rod of length mass 4.0 kg is hanging from the tree branch after being hinged at one end. Estimate how high the pinada will swing
A television set connected to a 120 outlet consumes 73 of power. How much current flows through the television
A 90 kg linebacker running downfield at 10 m/s collides with a 65 kg referee who is at rest. What is the initial kinetic energy of the linebacker
You are holding a compass 3.50m from a long straight electrical supply wire that is carrying a direct current perpendicularly to the local direction of the Earth's magnetic field. What is the magnitude of the current carried by the wire
A potential difference of 87mV exists between the inner and outer surfaces of the cell membrane. The inner surface is negative relative to outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell.
What is the longest focal length lens that will work?
Treat a cell in a human as a sphere of radius 1.0 µm. What's the volume of the cell
A light rod of length 1.8 m has two point masses of mass 2 kg attached at either end. If the spring constant is 3.7 Nm.rad-1, what is the period of the resulting motion
It exhausts the propellant in a 20-s “burn.” If the rocket, initially at rest, moves at 150 m/s after the burn, illustrate what impulse is experienced by the rocket sled?
A 3.00 g lead bullet traveling at 650 m/s strikes a target, converting its kinetic energy into thermal energ, Find the heat required to melt the bullet
A 36 kg girl and a 7.9 kg sled are on the frictionless ice of a frozen lake, 20 m apart but connected by a rope of negligible mass. How far from the girl's initial position do they meet
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