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A G.M. counter records 4,900 background counts in 100 min. With a radioactive source in position, the same total number of counts are recorded in 20 min. Calculate the percentage of S.D. with net counts due to the source
Presume that a passenger intent on lunch through his first ride in a hot-air balloon accidently drops an apple over the side through the balloon’s liftoff. At the moment of the apple’s release, the balloon is accelerating upward with a magnitude of 4..
A mass of 9.30 kg is suspended from a 1.45 m long string. It revolves in a horizontal circle, Calculate the angle between the string and the vertical
A sled and rider with a combined weight of 63 kg are at reston the top of a hill 11 m high. What is their total ebergy at the top of the hill ?
While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.97 m/s. At what speed does the stone impact the ground
A ball is thrown upward from the ground with a speed of 30 m/s. What is the total time the ball is in the air
What is the fundamental frequency of the string i.e. the frequency once she removes her finger from the string and it vibrates over its full length?
Work of 2 Joules is done in stretching a spring from its natural length to 17 cm beyond its natural length. What is the force (in Newton's) that holds the spring stretched
a person pulls on a 50Kg desk with a 200N force acting at 30 angle above the horizontal. the desk does not budge. draw a force diagram for the desk. Write down the equation that describes the forces which act in the x-direction.
Find positions of four charges in a plane (+1C, -1C, +2C, -2C) that result in an equilibrium (zero net force on each charge). Report positions as four (x,y) pairs.
A circular conducting loop by a radius of .37m has a resistance of 10Ω and is orientated on the xy plane. If a magnetic field of 1.8 T making an angle of 30 degrees by the z axis. Increases to 8T in 2.1s. What is the magnitude of the current that w..
A railroad car of mass 2.3 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
A 46 gram golf ball is hit and launched at 194.4 km/hr at 30 degrees above the horizontal. How much Kinetic energy does the ball have at the maximum height
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