Two identical drops with radius 2mm join to form a bigger drop. evaluate the lost or gained surface energy given that the surface tension of water is 0.72N/m² e1=4.5×10^-6 joules
e2=9.0510×10^-6 joules

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.