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A sample contains radioactive atoms of two types, A and B. Initially there are three times as many A atoms as there are B atoms. Two hours later, the numbers of the two atoms are equal. The half-life of A is 0.72 hours. What is the half-life of B?
the earth rotates once per day about an axis passing through the north and south poles an axis that is perpendicular to
The starship Enterprise speeds by you at a speed of 0.960c. It is measure in your frame to be 100 m long. How fast did you appear to be traveling according to Data
At a certain distance from the center of the Earth, a 5.0-{\rm kg} object has a weight of 3.5N. By what factor does its initial acceleration change
A bullet emerges from the muzzle of agun with a speed of 300m/s. calculate the time for the bullet to travel the lenght of the barrel, assuming the force is zero at the end of the barrel
a simple pendulum with a length of 1.93 m and a mass of 6.54 kg is given an initial speed of 2.46 ms at its equilibrium
A cylinder with a movable piston contains 12.1 moles of a monatomic ideal gas at a pressure of 1.5 × 105 Pa. What is the change in volume of the gas
a cylinder with a movable piston contains gas at a temperature of 27 degrees celsius a volume of 1.50m3 and an absolute
Let all the three charges be placed at the center of a tetrahedron, composed of four triangular faces of equal area. Calculate the net flux through each surface
during an earthquake the top of a building oscillates with an amplitude of 30cm at 1.5hz.part a what is the magnitude
A long thin steel rod is 500.00 centimeter long at 0oC. When exposed to the summer sun, its temperature is raised to 33oC. Evaluate the length of the rod at the higher temperature
ne kilowatt-hour (kWh) is the amount of work or energygenerated when one kilowatt of power is supplied for a timeof one hour. find the numbner of joules of energy in one kilowatt-hour
The electric field points radially outward at all points within the sphere (and outside too, for that matter). What is the strength of the electric field at a distance r from the center, inside sphere.
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