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A railroad engine weighs three times as much as a freight car. If the engine coasts at 9 km per hour into a freight car that is initially at rest, how fast do the two coast after they couple together?
The space shuttle is in a 250 mile high orbit. what are the shuttle's orbital period and speed
A sample of CO2 has a mass of 50 g. What is the number of molecules of carbon dioxide in the 50 g sample
A 2.10-cm-high insect is 1.50m from a 139-mm-focal-length lens. Where is the image? Follow the sign conventions, How high is the image
How man electrons are present in a 1.5C charge? Determine the mass of the 1.5 C charge. 1e=9.1x10^-31kg. determine the resistivity constant if the wire has a cross sectional area of 2x10^-5 m^2
An opera singer in a convertible sings a note at 600 whereas cruising down the highway at 81. What is the frequency heard by a person standing beside the road in front of car? What is the frequency heard by the person standing beside the road behi..
The closest star to our solar system is Alpha Centauri, which is 4.30 light years away. How much time would elapse on a clock on the Earth
Illustrates a FBD of the person
A spherical balloon has a radius of 6.95 and is filled with helium. The density of helium is0.179, Determine the largest mass of cargo the balloon can lift
A clown is using a concave makeup mirror to get ready for a showand is 27.9 cm in front of the mirror. The image is 66.1cm behind the mirror. Calculate the focal length of the mirror.
Two small spheres have a mass 9.0g and having an electric charge q are suspended by a length of 32cm. Find Electrical Charge in C, Conducting rod 21.0 cm bent into semicircle. Linear density -5.20 * 10^-8 C/m. Find Electrical Potenial at the center..
What should be the minimum initial speed of the dart so that combination makes a complete circular loop after the collision. find the minimum diameter of the raft that would prevent the diamond from being seen.
An object with a mass of 4.0 Kg travels with a constant velocity of 8.5m/s northward. How far will the object travel before coming to rest
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