What is the efficiency of a ramp if 2,000 joules of energy results in 1.200 joules of work? (1 point) O 32%
O 80%
60%
0 24%

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

(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

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above