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A river is 175 meters wide and has a current that is flowing at 4 meters/second from the north to the south. A swimmer tries to cross the river at a velocity of 9 meters/second.
What velocity and heading will the swimmer have to use to get 50 meters upstream from directly across the river in 19.4 seconds?
Illustrates the physics principles in this problem. An astronaut in his space suit and with a propulsion unit (empty of its gas propellant) strapped to hisback has a mass of 147 kg. During a space-walk, the unit, which hasbeen filled with propella..
A Young's double-slit interference experiment gives bright fringes separated by 2.5 cm on a screen when the experiment is performed in air. What is the new spacing between bright fringes
A man pushes a box with a constant horizontal force. The mass of the box is 150 kg, the coefficient of kinetic friction between the box and the floor is 0.25, Find the work done by the man
1 a small steel ball bearing with a mass of 20.0 g is on a short compressed spring. when aimed vertically and suddenly
Find the tension in each of the two ropes supporting a hammockif the first one is at an angle of 13.5° above the horizontal and the second is at anangle of 35.4° above thehorizontal. The person sleeping in the hammock (unconcerned abouttensions an..
the charging circuit for the flash system of a camera uses a 11010-6 f capacitor that is charged from a 240 v power
questionair has a small regularly negligible index of refraction. it is 1.0002926. this causes the sun to actually be
Infrared spectra are used by chemists to help identify an unknown substance. Atoms in a molecule that are bound together by a particular bond vibrate at a predictable frequency, determine the resonant frequency of this bond and the wavelength of li..
A tank of water sits at the edge of a table of height 2.2 m. The tank springs a very small leak at its base, and water sprays out a distance of 1.7 m from the edge of the table
How much heat transfer is nec to raise the temp of a .200kg piece of ice from -20C to 130C including the energy needed for phase changes
A merry-go-round starts from rest and accelerates uniformly over 23.5 s to a final angular velocity of 6.25 rev/min. Find the person's maximum radial acceleration
To see that it is easy to break a thighbone when falling in this fashion, find out the greatest distance through which his center of gravity can fall without his breaking a bone.
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