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A geostationary communications satellite orbits the earth directly above the equator at an altitude of 34800 . Calculate the time it takes for a signal to travel from a point on the equator to the satellite and back to the ground at another point on the equator exactly halfway around the earth. (See Appendix E in the textbook.)
If the initial temperature of the horseshoe is 600?C, and initial temperature of the water is 40?C, what is the equilibrium temperature of the system? Suppose no heat is exchanged with the surroundings.
a 65 kg person throws a .045 kg snowball forward with a speed of 30 ms. a second person with a mass of 60 kg catches
An automobile and a truck start from rest atthe same instant, with the automobile initially at some distancebehind the truck. What is the speed of each when they are abreast
A person with a near-point distance of 29 cm is able to get a usable magnification of 12 with a particular magnifying glass. What is the friend's near-point distance
Uniform metal rod, with mass of 3.4 kg and length of 1.5 m, is attached to a wall by a hinge at it's base. A horizontal wire bolted to the wall 0.75m above the base of the rod holds the rod atan angle of 30degrees above the horizontal. The wire is..
A commuter train blows its horn as it passes a passengerplatform at a constant speed of 40.0m/s. What is the frequency observed by a person on the platform as the train approaches
A divers lungs hold 0.0050 m^3 of air at sea level, where the pressure is 101.3 kPa. what is the volume of the air in his lungs at a depth of 3 m
a ring has a radius r and charge q. the ring is shrunk to a new radius 12 r with no change in its charge. by what
A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 4.0 mW. How many photons are emitted per second by this laser
an aluminum rod has a resistance of 3.30 ? at 20.0degc. calculate the resistance of the rod at 120degc by accounting
as soon as a traffic light turns green a car speeds up from rest to 50.0 mih with a constant acceleration of 9.90
Consider a stack of paper 3.0 meters high. each sheet of paper is the stack has a thickness of 0.01 centimeter
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