A car travels at a speed of 55 km/hr and slows down to 10 km/hr in 20 seconds. What is the acceleration? a) -2.25 km/h/s
b) 2.25 km/h/s
c) 3.5 km/h/s
d) -3.5 km/h/s

(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

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?