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An ancient rock is found to contain Ar40 gas, indicating that 77% of the K40 in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. How long ago did the rock solidify? The half life of K40 is 1.25 billion years.
A 20 kg. projectile is fired at an angle of 60 degrees abovehorizontal with a speed of 80 m/s. how much energy is released during explosion
The photoelectric effect experiment is often carried out by using a mercury light source to illuminate a particular surface. What is the work function of this surface
A 14-A current flows into a series combination of 2.0 ?, 3.0 ?, and 6.0 ? resistors. How much power is dissipated by each resistor
A circus clown wiwith a mass 54 kg is launched vertically from a springloaded cannon using a spring with a spring constant of 3.5*10^3 N/m. What is maximum speed of clown
An astronaut's normal weight it 600 newtons. How much would she weigh while orbiting in a satellite at 12,000 kilometers [two earth radii] above the surface of Earth.
A light spring with a force constant of 12 is connected to a wall and to a 1.9 toy bulldozer, What is the numerical value of this coefficient of friction
An astronomical telescope uses an eyepiece of power +80.000 D. what is the magnification of the telescope
An airplane is flying at an altitude of 2500m above the ground when it sees a stranded on a an island 4000m away. If a pilot lets go of a rescue package and it lands on the island, how fast was the plane traveling? what was the final velocity of the..
Describe the operation of a scanning tunneling microscope and explicitly include how it involves barrier tunneling.
A solid sphere of mass 2.5 Kg and a radius .15m starts from rest at the top of the ramp inclined 15 degrees, and rolls to the bottom without slipping. What is the total kinetic energy of the sphere
A team of dogs drags a 130 kg sled 1.91 km over a horizontal surface at a constant speed. Find the work done by the dogs
During the Millikan experiment used to determine the charge on the electron, a charged polystyrene microsphere is released in still air in a known vertical electric field, How many excess electrons are on the sphere
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