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An X-ray machine accelerates electrons over a 300kV potential difference. The current is 1mA and the efficency of X-ray production in the anode is 0.01%. If the average energy of the emitted photon is 100keV, how many photons are emitted per second?
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity.
A constant force is applied to object A and causes it to accelerate5m/s^2. The same force is applied to object B which accelerates 3m/s^2. The same force is applied to object C andit accelerates 8m/s^2.
Two point charges 2.0cm apart have an electric potential energy -310uJ. The total charge is 15nC. What is the lesser charge
consider a model rocket that is lunched in a vertical direction. Nelected air resistance and changes in its mass , m. determine the mamimum alttiude
In an action movie, the villain is rescued from the ocean by grabbing onto the ladder hanging from a helicopter. what was the speed at which the helicopter was ascending
A woman is riding a Jet Ski at a speed of 25 m/s and notices a seawall straight ahead. what is the minimum distance from the seawall
a village maintains a large tank with an open top containing water for emergencies. the water can drainnbspfrom the
A target in a shooting gallery consists of a vertical squarewooden board, 0.250 m on a side and with mass 0.750 kg, What is the angular speed of the board just afterthe bullet's impact
for a horizontal block spring system, the maximum displacement is 15cm. if k = 150N/m, calculate the mass of the block, calculate maximum value of kinetic energy
A cylinder rolls without slipping down an incline that makes a 57° angle with the horizontal. What is the acceleration of the cylinder
question on forming the nuclide from the protons neutrons and electrons the mass loss per nucleon for the is 0.00759
Assume that a cement truck with a mass of 10,000 kg hits you while you were stopped at a traffic light, and that you are driving a Yugo with a mass of 750 kg. If the truck was traveling at 15 mph and the crash makes you stick together (you and the..
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