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    Thermal energy of snow

    Homework Statement Assuming that the snow is -4 degrees celcius and that the water is dumped at +4 degrees celcius, calculate the amount of heat energy required to operate a metromelt for one hour. Homework Equations Q=mct Q=mLf *little f* The Attempt at a Solution I...
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    Critical angle homework

    Homework Statement The critical angle diamond (n=2.42) and water (n=1.33). Find the angle. Homework Equations The Attempt at a Solution I dun get how u find the angle with 2 n's. I need a solution.
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    Conservation of Energy and potential energy problem

    Homework Statement A 4.0X10 to the power of 4 kg roller coaster starts from rest at point A. Neglecting friction, calculate the potential energy relative to the ground, its kinetic energy, and its speed at points B, C and D. Height A=54m Height B=15m Height C=47m Height D=35m...
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    Homework problem- Work and energy problem

    Homework Statement A 68 kg in-line skater starts from rest and accelerates at 0.21 m/s square for 15s. a) Find her final velocty and total kinetic energy after the 15s of travel. b) If she exerts a breaking frictional force of 280N, find her stopping distance. Homework Equations...
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    Find the index of refraction

    Homework Statement Suppose a convex lens is ground so that one surface has a radius of curvature of 30.0 cm and the opposing surface has a radius of curvature of 40.0 cm. The focal length is 34.2cm. What is the index of refraction of the lens? What kind of glass is the lens? Homework...
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    Index of refraction question-need help.

    Suppose a convex lens is ground so that one surface has a radius of curvature of 30.0 cm and the opposing surface has a radius of curvature of 40.0 cm. The focal length is 34.2cm. What is the index of refraction of the lens? What kind of glass is the lens? Need help by using the formula...
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