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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 magnitude of the electrostatic force between two identical ions that are separated by a distance of 0.90 nmis 4.103×10-8 N, How many electrons are missing from (or have been added to) each ion
A rectangular block of copper has sides of length 12 cm, 22 cm, and45 cm. what are the currents thatthe block can carry
an ore sample weighs 20.0n in air. when the sample is suspended by a light cord and totally immersed in water the
A physics student wants to build a spring gun that when aimed horizontally will give a 30.0- g ball an initial acceleration of 'g' by releasing a spring that has been compressed 14.0 cm. What spring constant is necessary? What is the velocity of the ..
A 10-cm length of wire carries a current of 3.0 A. What is the magnitude and direction of the force on this segment of wire
The magnetic field inside a superconducting solenoid is5.10 T. The solenoid has an inner diameterof 6.20 cm and a length of 26.0 cm. Determine the magnetic energy density in the field.
Playing near a road construction site, a child falls over a barrier and down onto a dirt slope that is angled downward at 42° to the horizontal, What is the coefficient of kinetic friction between the child and the slope
Calculate the average power output (in watts) of a photodetector that collects 8.0 x 107 photons in 3.8 ms from monochromatic light of wavelength 325nm.
Three 3.0 uC charges are at the three corners of an square of side0.50 m. The last corner is occupied by a -3.0 uC charge. Find the electric field at the center of the square.
Calculate the adiabatic flame temperature attained when methane at 298k, is combusted (a) with oxygen in the molar ratio air/CH4 = 9.524. Assume that CO2 and H2O are the products of the combustion. The adiabatic flame temperature is that temperature ..
Consider the ballistics pendulum experiment. If M=1kg and m=0.1kg, and the velocity of the bob-ball system right after the collision is Vf=2m/s, what was the initial velocity of the ball before it hit the bob
If I have a box with a movable divided and ideal gas inside, and I have Pleft greater than Pright, therefore the movable divided moves to change the volume so that pressure is in equilibrium, then how much is the change of entropy?
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