Aperson cooks a meal in a 30-cm-diameter pot that is covered with a well-fitting lid and lets the food cool to the room temperature of 20°c. the total mass of the food and the pot is 8 kg. now the person tries to open the pan by lifting the lid up. assuming no air has leaked into the pan during cooling, determine if the lid will open or the pan will move up together with the lid.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Explain why electric current cannot exist if a current doesn't have a voltage source.

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?