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A boy of mass m runs with a speed v and jumps onto a sled on an icy pond. The sled was at rest before the boy jumped onto it. After the jump, the sled and boy move at a speed v/4. What is the mass of the sled?
A ball is thrown from the top of a building upward at an angle of 35? to the horizontal and with an initial speed of 15 m/s. How long is the ball in flight
A car plus its driver has a mass of 1400 kg. when the driver takes his foot off the accelerator, the car slows from 30 m s^-1 to 20 m s^-1 in 20 s. how much work was done by dissipative forces
A 21 kg chimpanzee hangs from the end of a horizontal, broken branch of length L_0 = 1.6 m, What is the shear modulus for this branch
A computer is reading data from a rotating CD-ROM. At a point that is 0.037 m from the center of the disc, the centripetal acceleration is 120 m/s2. What is the centripetal acceleration at a point that is 0.054 m from the center of the disc
A block that has a mass M = 4.25 kg is hanging at rest on a light string. A projectile with a mass m = 250 g moving horizontally strikes M and sticks to it. The block and its projectile swing up and the center of mass rises a distance h = 12.0 cm. Th..
A pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing.
Copper pennies weighing 2.5 g have been placed in boiling water at 100 degree Celsius. How many pennies must be added to the water to raise the temperature to 31 degree Celsius
In the first part of the experiment you are asked to plot a graph of force versus length. What will be the expression for the slope of this curve
A model rocket is launched straight upward with an initial speed of 45.3 m/s. What is the maximum height reached by the rocket
A tank of 0.5 m3 volume contains compressed air. A valve is opened and air escapes with a velocity of 220 m/s through an opening of 100 mm2 area. Find the rate of change of density of the air in the tank at this moment
The index of refraction for a diamond for red light of wavelength 654 nm is 2.35, Find the angle of refraction for red light
A 2.1 kg block of wood rests on a long tabletop. A 11.8 g bullet moving horizontally with a speed of 156 m/s is shot into the block and sticks in it
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