A cyclist takes a ride lasting 25s. The diagram shows how her distance travelled from the starting position varies with time. 150 distance travelled/m 100 50 5 10 15 20 25 time / s what is her average speed for the whole ride (a) 6.0 m/s
(b) 7.5 m/s
(c) 10.0 m/s
(d) 11.0 m/s

When you turn on a battery-operated device, an electrical circuit is

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47