The ruler length and width measurements reflected the largest bias, regardless of wound shape [8]. The standard error of measurement (SEM) is defined as the difference between an observed score and a true score, so the SEM is an indication of the imprecision of a measurement technique [17].
Washington: Runaway planets zipping through space at mind-numbing speeds of 30 million miles per hour are now the fastest objects in the universe, says a study. Seven years ago, the discovery of the first runaway star, shooting out of our Galaxy at a staggering speed of 1.5 million mph, set astronomers on a course of exploration.
The fastest thing in the whole. universe is the speed of light in a vacuum (like outer space!), clocking in at a great 2.99 x 10 8. m/s. Light. travels in waves , and we call this traveling propagation . Propagation of waves has both a speed and a. direction, called the velocity . The velocity of light changes depends on the material it travels through. Light waves can be changed in a few different ways. Reflection is when the waves bounce off a. surface and change direction, like when they hit a mirror or pool of water.