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you stand on a frictionless platform tha tis rotating with anangular speed of 1.5 rev/s. your arms are outstretched, andyou hold a heavy wight in each hand. the moment of inertia ofyou , the extened wights, and the ltform is 6 kg m^2. when you pullthe wights in toward your body the monent of inertia decreases to1.8 kg m^2
A) what is the resulting angular speed of the platform?
B) what is the chang in kinetic energy of the system?
C) where did this increase in energy come from?
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Protons in cosmic rays have been observed with kinetic energies as large 2.70 × 108 eV. How fast are these protons moving
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A hanging block A ( Ma = 15 kg) is connected by a light cable and a pulley wheel to a second block B ( Mb = 10 kg) situated at the bottom of a frictionless inclined plane with angle %u03B8 = 30o to the horizontal
200 ml of coffee ( density = 1000kg/m^3 , specific heat 4186j/kg C ) is insulated in a mug at a temp of 85C. If 25ml of cream ( density of 1500 kg/ m^3 , specific heat 4500j / kg C at 10 C is added what will be the new temperature of the system?
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. How far short of the target should it drop the package
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length scripted l = 0.65 m, Find the net work done on the crate while it is on the rough surface
A sample is bombarded by incident X-rays, and free electrons in the sample scatter some of the X-rays at an angle of -0= 122.0 degrees, Determine the wavelength (in nm) of the incident X-rays
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