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A girl is skipping rocks across a lake. One of the rocks accidentally ricochets off a toy boat initially at rest in the water. The 0.086 kilogram rock strikes the boat at a velocity of 13 m/s, 15 degree below due east, and ricochets off at a velocity of 11 m/s, 12 degree above due east. After being struck by the rock, the boat's velocity is 1.2 m/s, due east. Find what is the mass of the boat? Suppose the water offers no resistance to the boat's motion.
A circular coil enclosing an area of 140 cm2 is made of 190 turns of copper wire. The wire making up the coil has resistance of 3.0 Ohms, what is the average current in the coil during that time
Unpolarized light passes through two polarized sheets. Theaxis of the first is vertical and that of the second is at16degrees to the vertical. What is the fraction of the initiallight that is tranmitted
describe the importance of rare earth elements in science and technology. assess the most common uses of these
A 4.0g mass is attatched to a wire of diameter 0.64mmwith a full stretched of 0.60mm which is 1/5000 of the originallength. Determine the tensile stress and strain
A dry cell when short-circuited will furnish about 30 amp for a brief time. If its emf is 1.5 v, calculate what is its internal resistance
Two identical guitar strings are prepared such that they have the same length (2.43 m) and are under the same amount of tension. find the wave propagation speed on the guitar strings
Unpolarized light with an average intensity of 845 W/m2 enters a polarizer with a vertical transmission axis. What is the orientation angle of the second polarizer relative to the first one
A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 m3 of water and the surface area of the bottom of the container is 4.64 m2. The height of the lower part of the container is ..
At a tea party, a coffeepot and a teapot are placed upon the serving table. The coffeepot is a shiny silver-plated pot with emissivity of 0.30; the teapot is ceramic and has an emissivity of 0.55. what is the rate of radiative heat loss from the tw..
a 220-turn coil carries 320ma . if the magnetic flux through the coil due to this current is 0.80wb whats the coils
A piece of metal, when weighed in air has a weight of 20.7 newtons. When completely submerged in blood( density of blood=1060kg/m^3) the metal has a weight of 12.7 newtons. What is the density of the the metal
A person exerts a horizontal force of F = 169N in the test apparatus. (h = 0.32m.) Find the horizontal force M that his flexor muscle exerts on his fore arm.
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