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A dad pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 16rpm in 10.0s . Assume the merry-go-round is a uniform disk of radius 2.5 m and has a mass of 560 kg, and two children (each with a mass of 25 kg) sit opposite each other on the edge.
A. Calculate the torque required to produce the acceleration, neglecting frictional torque.
B. What force is required at the edge?
For 140 keV gamma rays, the mass attenuation coefficients for hydrogen and oxygen are 0.26 and 0.14 cm^2/g, respectively. What is the mean free path in water at this energy
Sheena can row a boat at 3.03 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.55 mi/h. How long does it take her to cross the river
Jane and John, with masses of 51 kg and 66 kg, correspondingly, stand on a frictionless surface 13m apart. John pulls on a rope that connects him to Jane, giving Jane an acceleration of 0.9m/s2 toward him.
A converging lens with a focal length of 5.00 cm is placed 20.00 cm in front of a concave mirror whose focal length is also 5.00cm. Calculate the position of the final image formed by the system
Young's experiment is performed with light of wavelength 502nm from excited helium atoms. What is the separation of the two slits
A 53 kg skier skis directly down a frictionless slope angled at 12° to horizontal. Choose the positive direction of the x axis to be downhill along the slope.
Two loudspeakers emit 500Hz notes. One speaker sits on the ground. The other speaker is in the back of a pickup truck, What is the truck's speed
A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.50 mm. what is the actual diameter of the red blood cell
A field mouse trying to escape a hawk runs east for 6.0m , darts southeast for 3.8m , then drops 1.8m down a hole into its burrow
Electric charge Q has been spread uniformly over a circular arc of radius R and central angle 40 degrees. What is the potential at point P, center of curvature of the arc.
a 71 kg baseball lplayer jumps straight up to catch a line drive. If the 140 g ball is moving horizontally at 28 m/s and the catch is made when the ball player is at the highest point of his leap what is his speed immediately after stopping the ba..
Physics: Compression of column; constant of a spring, 1. A 4.8-m-tall, 30-cm-diameter concrete column supports a 5.0Ã?105 kg load. By how much is the column compressed?
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