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There are many evaluates of the number of stars in the universe. One evaluate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe. Assuming that the number of stars in the Milky Way is the average number of stars in a galaxy, evaluate how many stars there are in the universe. It perhaps goes without saying.
A neutron at rest decays into a proton with a decay energy of Q=0.782 MeV. Find maximum kinetic energy of the residual proton
The proton is replaced with He2+ ion now at a distance of 3 cm from the bead. What is the magnitude of the force experienced by the helium ion
A helicopter is ascending vertically with a speed of 5.20m/s. at a high of 125m above the earth, a package i dropped from a window. How much time does it take for the package to reach the ground? (Hint: the package's initial speed equals helicopte..
a 6.10times10-2kg cube of ice at an initial temperature of -18.0 c is placed in 0.880kg of water at 41.0 c in an
The rotor in a certain electric motor is a flat, rectangular coil with 88 turns of wire and dimensions 2.33 cm by 4.20 cm, What is the average power of the motor
a charge of -1.4 microc is fixed in place. from a horizontal distance of 0.0225 m a particle of mass 7.75 x 10-3 kg and
A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like the merry-go-round. At first the cockroach and disk rotate together with an angular velocity of 0.220 rad/s. Then the cockroach walks ..
A football is kicked at ground level with a speed of 15.0 m/sat an angle of 40.0 to the playing field (horizontal). How much later does it hit the ground
During an electrostatic field experiment, you assume that the electric field lines are in the plane of the paper, What condition determines the accuracy of this assumption
A piece of aluminum has density 2.70g/cm 3 and mass775 g. The aluminum is submerged in a container of oil of density 0.650 g/cm3.How much oil does the metal displace? A solid rock, suspended in air by a spring scale, has a gauged mass of 9.0 kg. Whe..
A car rounds a curve that is banked inward. The radius of curvature of the road is R = 114, Find the maximum speed that the car can have without slipping
A constant horizontal force F applied by a fishing line to auniform solid disk of radius R and mass M. The line is wrappedaround the central portion of the cylinder (see the fig- ure) withradius r = R/4 and negligible thickness (just to hold the w..
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