What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm?

Why cooking gas has a typical smell

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is