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1. A skater extends her arms, holding a 2kg mass in each hand. She is rotating about a vertical axis at given rate. She brings her arms inward toward her body in such a way that the distance of each mass from the axis changes from 1m to 0.50 m. what is her new rate of rotation.
2. A mass m is attached to a massless spring with a force constant k. The mass rests on a horizontal frictionless surface, The system is compressed distance x from the spring's initial position and then released. Find an expression for the momentum of the mass when the spring passes its equilibrium point.
A fire truck has a siren with that generates a sound with a frequency of 8562 Hz. what frequency will you observe
A proton (charge 1.6e-19C and mass 1.6e-27kg) is released from rest at 1m away from a very large flat insulator sheet which has a uniformly distributed charge with a charge density of -8.85 microCouloms/meter^2
an electric vehicle starts from rest and accelerates at a rate of 2.3 ms2 in a straight line until it reaches a speed
Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. Jack has a mass of 74.5kg , What is the final speed of the crate if Jill jumps first and then Jack, again in the same direction
at the end of the shock wave roller coaster ride the 6000kg train of cars including passengers is slowed from a speed
the top of pikes peak is 14100 ft above sea level. neglecting the variation of t with altitude and using the average
The density of a 5.0-m long rod can be described by the linear density function ?(x) = 125 g/m + 14.5x g/m2. Determine the total mass of the rod
A box on a table top (m = 10 kilogram) is attached via a pulley to a hanging mass (45 kilogram). Obtain the acceleration, frictional force and tension of the system
Potential energy of a not obeing Hooke's law spring is given by the equation U(x)=5.00(J/m)x - 2.00(J/m3)x3, What is the expression for the restoring force of the spring
a 210 g bucket containing 12.5 kg of water is hanging from a steel guitar string with mass m 8.58 g density p 7750
A spherically spreading EM wave comes from a 1200 W source. What is the rms value of the electric field
A 48 g piece of ice at 0.0 degree C is placed in an insulated calorimeter of negligible heat capacity containing 100 g of water at 100 degree C. What is the final temperature of the water once thermal equilibrium is established? Find the entropy chan..
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