48. two people are sitting in a car that is moving at a rate of 70 miles per hr. without more information, why is it not possible to definitively state how fast the passengers are moving?

49. a roller coaster has a total track length of 500 yards. a complete ride on the roller coaster is considered two times around the track. the start and stop places for the ride are virtually the same. what are distance and displacement for the ride on the roller coaster? explain your answer

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

Ineed this now one scientist feels that the changes in global climatic patterns may be good for the health of the biosphere. another scientist feels that sharp changes in climatic patterns could result in the extinction of the biosphere. which of these is the most likely reason the two scientists gave conflicting opinions on the impact of changes in the global climatic pattern? they do not have enough knowledge on the topic. they did not discuss the issue among themselves. they believe conflicting opinion strengthens science. they study different areas of science and have different scientific focuses.

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?