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Given that the nearest star is about 4 light years away, a) develop an estimate of the density of stars per cubic light year in our galaxy.
b) estimate the number of stars in the milky way galaxy given that it's roughly a disk 100 000 light years across and a thousand light years thick.
Water flows at 0.25L/s through a 11 meter long garden hose 2 centimeter in diameter that is lying flat on the ground. Find the gauge pressure of water where it enters the hose
A wheel with a tire mounted on it rotates at the constant rate of 2.59 times a second. A tack is stuck in the tire at distance 31.7 cm from the rotation axis. Noting that for every rotation the tack travels one circumference, find the tack\'s tangent..
A horizontal 802-N merry-go-round is a solid disk of radius 1.44 m, started from rest by a constant horizontal force of 50.3 N applied tangentially to the edge of the disk
Two particles are moving along the x axis. Particle 1 has a mass m1 and a velocity v1 = +3.7 m/s. Find the ratio m1/m2 of the masses of the particles
A +60 µC charge is placed 56 cm from an identical +60 µC charge. How much work would be required to move a +0.57 µC test charge from a point midway among them to a point 11.0 cm closer to either of the charges?
A 300 turn solenoid has a radius of 1.00 cm and a length of 15.0 cm. Find the inductance of the solenoid
A crate with a weight of 50N rests on a horizontal surface. A person pulls horizontally on it with a force of 10N and it does not move. To start it moving, a second person pulls vertically upward on the crate. If the coefficient of static friction is..
A wedge of mass m=36.1 kg is located on a plane that is inclined by an angle ?=21.3 degrees with respect to the horizontal. A force F=302.3 N in the horizontal direction pushes on the wedge. The coefficient of kinetic friction between the wedge and t..
In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (?196°C ) and in boiling allyl alcohol (97°C). What pressure would be found at the boiling point of water
1 to work on your car at night you use an extension cord to connect your work light to a power outlet near the door.
Professor Spenditt, oblivious to economics and politics, proposes the construction of a circular proton accelerator around the Earth's circumference using bending magnets that provide a magnetic field of 1.5T. What would be the kinetic energy of prot..
An elevator with a mass of 1000 kg, including passengers, is ascending at constant speed. What is the power delivered by a motor for this ascend
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