Water moves from earth's surface to the atmosphere and back to earth's surface again in a process known as the water cycle. which of the following is the major form of energy driving the water cycle?
a. nuclear energy
b. geothermal energy
c. solar energy
d. chemical energy

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.