** a marathon runner completes a 42.238 km course in 2 h, 31 min, and 46 s . there is an uncertainty of 29 m in the distance run and an uncertainty of 3 s in the elapsed time. what is the percent uncertainty in the average speed?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

What explosion in the upper solar atmosphere releases about as much energy as millions of 100-megaton hydrogen bombs exploding simultaneously?

Ln finding the density of liquid why is the method of using a density bottle more accurate than the one of using a measuring cylinder