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Q. compute the minimum amount of energy, in joules, required to completely melt 140 g of silver initially at 14°C.

Q. A skateboarder shoots off a ramp with a velocity of 5m/s, directed at an angle of 52° above the horizontal. The end of the ramp is 1.20 m above the ground. Let the x axis be parallel to the ground, +y direction be vertically upward, and take as an origin the point on the ground directly below the top of the ramp.

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