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Compute what period of time is required for a sample of radioactive uranium-235 to lose 99.280 percent of its activity? (The half-life of uranium is 7.038 x 10 yr).
A.) What is the total negative charge, in coulombs, of all the electrons in a small 1.00 sphere of carbon? One mole of is 12.0 , and each atom contains 6.00and 6.00 electrons.
q1. what will be the equilibrium temperature when a 223 g block of copper at 258 c is placed in the 178 g aluminium
For gas storage, thick metal cylinders whith an internal volume of 25 litres are used; typical cylinders can safely maintain a pressure of 180 atm. how many moles of gas can such a cylinder hold
drop a rock into a well. You hear the splash 2.40 s after you release the rock from rest. The speed of sound in air at the ambient temperature is 336 m/s. How far below the top of the well is the surface of the water?
forces acting on the arm of a person lifting a dumbbell. the force f is the force pulling on the hand due to the weight
A photon with wavelength 0.02680 nm strikes a free electron that is initially at rest. What is the energy of the scattered photon
Three point charges form an equilateral triangle near the origin. Q1 = +5.00 uC at x = 2.5m, Q2 = -5.00 uC at x = -2.5m, both on the x-axis, What is the potential energy of these three charges
On a day when the wind is blowing toward the south at 3 m/s, determine the resultant velocity (speed and direction) of the runner
Doug hits a hockey puck, giving it an initial velcoity of 6.0 m/s. how far will the puck slide before stopping
A projectile fired from a gun has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively. At what angle is the projectile fired
In a dramatic lecture demonstration, a physics professor blows hardacross the top of a copper penny that is at rest on a level desk. what is the minimum air speed needed to lift the penny off the table top
q1. the magnitude of f is 384 newtons and it points at 344o measured counter clockwise from the positive x-axis. what
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