In fission reactors one deals with neutrons having kinetic energies as high as 10 mev. how much error is incurred in computing the speed of 10-mev neutrons by using the classical expression rather than the relativistic expression for kinetic energy

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

When an object is heated it contracts. a. true b. false

Could we see a galaxy that is 20 billion light-years away?