João, depois de percorrer com seu carro 240 milhas,
parou durante 20 minutos para descansar. Sabendo que
o carro demora em média 1 hora para percorrer 39 km,
quantos segundos, aproximadamente, João gastou para
chegar até o ponto de descanso?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

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?

All phase changes are .an example of a phase change is an ice cube melting