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A sample contains 3.5Ã-1019 radioactive atoms with a half life of 10000 years. How many atoms are expected to decay in the first second?
M1 is five times more massive than M2. One force acts on the hanging mass, but the net force acts on both masses. Once you have the acceleration, you can compute the distance.
An asteroid is discovered heading straight toward Earth at 13 . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 , after which the asteroid is moving at 29 to its original path at a speed of 18..
A hang glider and its pilot have a total mass equal to 119 kg. While executing a 360° turn, What is the net force on the hang glider
A closely wound rectangular coil of 80 turns has dimensions 25 rm cm by 40 rm cm. The plane of the coil is rotated from a position in which it makes an angle of 37 degrees with a magnetic field of 1.10 rm T to a position perpendicular to the field..
A helium-filled weather balloon has a 0.90 m radius at liftoff where air pressure is 1.0 atm, What is the pressure at the airborne location
An iron rod is heated by a welder's torch. Initially it glows a dull red, then a brighter orange, and finally very bright white. Discuss this sequence in terms of black-body radiation.
A Carnot engine operates between 27C and 927C and preforms 4800 J of work. Calculate the net entropy change during one cycle
To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, Over what distance must the lens be movable
A bale of hay sits on the bed of a trailer. The trailer is starting to accelerate forward, and the bale is slipping toward the back of trailer. What would a force diagram and a free-body diagram look like for the above situation.
A typical car battery is composed of six, 2.1 V cells arranged in series to have an Emf of 12.6 V. How many electrons pass through the starter motor
Mary needs to row her boat across a 100-{rm m}-wide river that is flowing to the east at a speed of 1- {rm m/s}. Mary can row the boat with a speed of 2- {rm m/s} relative to the water.
Water runs out of the horizontal drainpipe at the rate of 120 liters per minute. It falls 3.20 m to the ground. Assume the water doesn't splash up, what average force does it exert on the ground? (1 liter = 1 kg.)
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