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A 1kg mass hangs from a cord wrapped around a solid disk pulley with a mass of 3kg and radius 25cm. The cord is 2m long and it's entire length is wrapped such that the weight is just touching the edge of the disk. Find the acceleration of the mass as it drops and the cord unwinds.
A hydrogen atom is in its second excited state, n=3. Find the total energy of the atom
A microwave radio transmitter emits electromagnetic waves of a single wavelength. What is the power of the transmitter
How much heat must be absorbed by ice of mass m = 720 g at -10 degrees Celsius to take it to liquid state at 15 degrees Celsius
each day the average family use 100kg of hot water to kill bacteria the water going into the tank at 20degc must be
A sealed box is placed inside a sealed container. A pressure gage attached to the box reads 60.0 kPa, what is the absolute pressure inside the box
Light with a wavelength of 525 nm passes through a single slit that is 35 micro meters wide. On a screen that is 1.5 m away, how far is the second dark spot from the central bright spot
A 65Kg ice skater pushes off his partner and accelerates backwards at 1.3m/s^2. If the partner accelerates in the opposite direction at 2.0m/s^2, what is mass of the other skater.
A 86.6-kg sprinter exerts a force of 100 N on the starting block at an angle of 30 with respect to the ground. The horizontal acceleration of the sprinter is
A capacitor has parallel plates of area 12 cm2 separated by 4.5mm . The space between the plates is filled with polystyrene, Find the induced surface-charge density on the surface of the dielectric
A railroad car with a mass of 2 x10^4 kg moving at 3.0 m/s collides and joins with 2 railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.20 m/s.
For a temperature increase of ?T1, a certain amount of an ideal gas requires 30 J when heated at constant volume, How much work is done by the gas in the second situation
A cancer patient is undergoing radiation therapy in which protons with an energy of 1.2 MeV are incident on a 0.25 Kg tumour. How many protons are absorbed by the tumour
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