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A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 0.73 kilogram sample of carbon from the wood has an activity of 2330 decays per minute. Determine the age of the charcoal. Living material has an activity of15 decays/minute per gram of carbon present and the half-life of 14C is 5730 y.
At a certain instant, a ball is thrown downward with a velocity of 8.0 m/s from a height of 40 m. find the time when the balls collide
We accelerate electrons between two parallel plates a few cm apart. We apply 2.05 MV across the plates. Find the momentum of the electron
three balls of equal mass are fired from the same position at a height h above horizontal ground with equal speeds. the
Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. Obtain what average power must the winch supply
question1a 95 m long train begins uniform acceleration from rest. the front of the train has a speed of 25ms when it
An explosion breaks an object initially at rest into two pieces, one of which has 2.2 times the mass of the other. obtain how much kinetic energy did the heavier piece get
A laser is used in eye surgery to weld a detached retina back intoplace. The wavelength of the laser beam is 514 nm, while the poweris 1.5 W. how many photons are emitted by the laser
A wire rests on the y axis and has 3 A of current flowing in the y direction. Compute the force (in i j k notation) on a 10 cm section of the wire if it sits in a magnetic field described by a) B= 0.28 T i, b) B = -0.68 T j, and c) B= -0.5 T i + 0.6 ..
A 70 kilogram diver steps off a 10 meter tower and drops from rest straight down into the water. Find the average resistive force exerted on the diver by the water
A pendulum swings through a maximum arc of 1 degree in 1 second. Calculate the time required for the two degree arc
a nonconducting rod of length L = 8.50 cm has charge -q = -4.56 fC uniformly distributed along its length. What is the linear charge density of the rod
The position function x(t) of a particle moving along an x axis is x = 4.5 - 4.5t2, with x in meters and t in seconds.
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