A cyclist is rounding a 19-m-radius curve at 12 m/s . What is the minimum possible coefficient of static friction between the bike tires and the ground?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

How do you know how many valence electrons an atom has?