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A river flows due south with a speed of 2.30 . A man steers a motorboat across the river; his velocity relative to the water is 4.40 . The river is 900 wide. How much time is required to cross the river?
A 51 crate, starting from rest, is pulled across a floor with a constant horizontal force of 250 . For the first 11.5 the floor is frictionless, and for the next 11.5 the coefficient of friction is 0.16. what's the final speed.
A glider of mass 0.155kg is moving to the right on a frictionless, horizontal air track with a speed of 0.760m/s. Find the magnitude of the final velocity of the 0.155kg glider
You stand with your nose 5.0cm from the surface of a reflecting ball, and your nose's image appears three-quarters full size. What is the balls diameter?
Three 1kg masses are at the vertices of an equilateral triangle of sides 10 cm. determine the location of the center of mass (x,y)
A large reflecting telescope has an objective mirror with a 10.0 m radius of curvature. what angular magnification does it produce
q1. the critical angle for a special type of glass in air is 41.8. the index of refraction for water is 1.33. what is
A meter stick, sitting on a frictionless table top, is struck by a wad of clay with a force, F = 4.0 N at an angle. The meter stick will rotate in the plane of the table. Conclude the magnitude of the torque about the axis of rotation located at t..
A sign has a mass of 1050 kg, a height h = 1 m, and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. What is the smallest value of the coefficient of friction
A particle with a charge of 4.50nC is in a uniform electric field directed to the left. It is released from rest and moves to the left; What work was done by the electric force
What is the maximum kinetic energy of electrons if the metal is illuminated by UV light of wavelength 375nm
An electron moves through an electric field, and its speed drops from 2200m/s to 1000m/s, what's the potential difference between the points at which the speed was measured
A heat engine does 180J of work per cycle while exhausting 440J of waste heat. What is the engine's thermal energy
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