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A 45 kg fiure skater is spinning on the toes of her skates at 1.0 rev/s. her arm outstretched as far as they will go. in this orientation, the skater can be modeled as a cylindrical torso(40kg, .2m average diameter,1.6m tall) plus two rod-like arms(2.5kg, .66m long) attached to the outside of the torso. the skater then raises her arms straight above her head, where she appears to be 56 kg, 20 cm-diameter, 200 cm tall cylinder. what is her new rotation frequency in revolutions per second?
The total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device. Obtain the total current delivered by the source
A rocket starts from rest and moves upward from the surface of the earth, What is the speed of the rocket when it is 340m above the surface of the earth
though the statement quoted above may by disputed most physicists do have a feeling that the great laws of physics are
A snowmobile climbs a hill at 15 mi/hr. The hill has a grade of 1 ft rise for every 40 ft. How fast will the snowmobile move downhill
a 142 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizantal is increased to ALPHA, If the coefficient of static friction between the crate and the ramp is 0.65, what is the angle alpha when the crate just begins t..
two crates rest on the floor one next to the other. a man pushes with a horizontal force of 600 n on the larger 50.0 kg
You digitize a 10-kHz signal by sampling it at twice the highest frequency (i.e 20,000 times a second) and encoding the the intensity in 8-bits. What is the resulting data rate
A hot-air ballonist rising vertically with a constant velocityof 5.00 m/s releases a sandbag at an instant when the balloon is40m above the ground. With what magnitude of velocity does it strike
A collimated gamma ray beam consists of equal numbers of 0.1 MeV and 1.0 MeV photons. If the beam enters a 5 cm thick lead shield, what is the relative portion of 1 MeV photons to 0.1 MeV photons in the emergent beam? State the source of all values u..
A world-class sprinter can burst out of the blocks to essentiallytop speed (of about 11.5 m/s) in the first 15.0 m of the race. how long does it take her to reach that speed
What is the net force of a 2.0 N force and an 6.0 N forceacting on an object for each of the following conditions? The forces act in opposite directions.-------N
A solid cylinder of mass 148.7 kg and diameter 0.72m has mounted to rotate around its axis, the cylinder has an initial angular velocity of wi, and the mass is 26m below the cylinder
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