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A double convex thin lens has surface with equal radii of curvature of magnitude 2.50 cm. Looking through this lens, you observe that it forms an image of a very distant tree at a distance of 1.87 cm from the lens. What is the index of refraction of the lens.

A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 1.80×10−2 kg of ice in thermal equilibrium at atmospheric pressure. Question: If 0.750 kg of lead at a temperature of 255degrees Celsius is dropped into the can, what is the final temperature of the system if no heat is...

A rifle bullet with mass 8.00 [g] strikes and embeds itself in a block with a mass of 0.992 [kg] that rests on a frictionless, horizontal surface and is attached to a coil spring. The impact compresses the spring 15.0 [cm]. Calibration of the spring shows that a force of 0.650 [N] is...