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A merry-go-round with moment of inertia of 550 kg m 2 has a boy of mass 45 kg riding in the center of the merry-go-round with an initial angular velocity of 9 revolutions per minute. The boy then travels from the center to the outside rim of the merry-go-round, whose radius is 2 m. (a) (5 pts) Express initial angular velocity in rad/s. (b) (5 pts) Calculate the moments of inertia of the system before and after the boy moves. (c) (5 pts) What is the angular velocity (in rad/s) of the merry-go-round after this motion of the boy? (d) (5 pts)What was the change in the Kinetic Energy?
You may have noticed a type of track lighting in museums or stores with modern decor called "cable track lighting." Bare power supply wires, What is the force between the long wires
You launch a rock from the origin (0,0) with an initial speed of 50 m/s at an angle of ?o=30° from horizontal. How far horizontally will the rock travel before it lands
a driver puts on the brakes and decelerates from 25 m/s to zero in12.0s. what distance does the car travel
Another particle, of mass 7.4 10-27 kg, moves along the positive x-axis with a speed of 4.0 106 m/s. (Assume that mass is conserved.) Evaluate the third particle's speed. What is the direction of motion?
The resistance of a bagel toaster is 14 ?. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster
At a grocery store, a spring scale (spring constant 450 N/m) hangs near the produce section. What is the velocity of the pan immediately after the oranges land on the pan
How many packs of shingles can the contractor lift before he begins to slide down the roof assuming the following Contractor weights and values for the coecient of static friction exists between the contractor and the roof.
If an astronomical telescope has the magnification of -32.0 ? and its objective lens has a focal length of 77 cm, what is the focal length of its eyepiece
Physics: Mechanics about two curling stones - calculate speed, resistive force Two curling stones A and B, each having a mass of 2 kg, are on an ice rink floor. A is stationary and 10 meters from a boundary wall, while B is sliding at right angles..
One of the asteroids, asty, looks like an elongated potato. Surprisingly it has a tiny (compared to asty) spherical moon! Find the acceleration of gravity on the surface of this little moon
The movement of the water because of the tides will give kinetic energy to the turbine blades, causing them to spin. In the calculations that follow ignore any frictional drag because of the seawater.
A 5.1- kg concrete block rests on a level table. A 3.6- kg mass is attached to the block by a string passing over a light, find the coefficient of friction between the block and the table
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