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A small block with mass .250kg is attacked to a string passing through a hole in a frictionless, horizontal surface. The block is originally revolving in a circle with a radius of .800m about the hole with a tangential speed of 4.00m/s. The string is then pulled slowly from below , shortening the radius of the circle in which the block revolves. The breaking strength of the string is 3.00 N. What is the radius of the circle when the string breaks?
initially 0.05 kg of air is contained in a piston-cylinder device at 200 degc and 1.6 mpa. the air then expands at
an accelerators beam is e 100mev protons that hit target that is made of iron. find the amount of time it takes for
What is the change in internal energy of a system that takes in 2.80 ? 106 J of heat, and does 4.50 ? 105 J of work while dissipating 9.00 ? 106 J of heat
A hoop of mass M and radius R is rotating about an axle at the edge of the hoop. what is the speed of the lowest point on the hoop
A black hole is roughly defined as a an object dense enough that the speed needed for launching things from its surface must be the speed of light or greater. 3.00x108m/s. Determine the maximum radius of the earth so that it might be a black hole. Th..
In serving, a tennis player accelerates at 56 kg tennis ball horizontally from rest to a speed of 30 m/s. Assuming that the acceleration is uniform when the racquet force is applied over a distance of .5 m, what is the magnitude of force exerted on ..
A current of 2.45 A flows along the length of a long solid cylindrical conductor. The radius of the cylinder is 8.5 cm. The current is uniformly distributed through the conductor. Calculate the magnitude of the magnetic field 2.4 cm from the cente..
A transmission diffraction grating 420 lines/mm is used to study the light intensity of different orders (n). A screen is located 2.5m from the grating. What is the separation on the screen between the three brightest red lines for a hydrogen source?
A 4 kg object moving at 17 m/s in the positive x direction has aone-dimensional elastic collision with an object initially at rest. After the collision the object of unknown mass has a velocity of 30 m/s in the positive xdirection. What is the unk..
A diving bell in the shape of a cylinder with a height of2.80 m is closed at the upper end andopen at the lower end. How high does sea water rise in the bell
At a distance of 6.0 km from a radio transmitter, the amplitude of the oscillating electric field of the radio wave is Eo=.13 V/in, What is the time-averaged energy flux
a girl kicks a ball from ground level. the initial velocity of the ball has an x-component of 17 m/s and a y-component of 10 m/s, what is the highest elevation reached by the ball
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