A 3874-kg rollercoaster is brought to the top of a 42m hill in 40 seconds, then drops 28m before the next hill. a) How much work is required to get the coaster to the top of the first hill?
b) What power is required to bring the train to the top of the first hill?
c) How much PE is lost when the coaster drops?
d) How much PE is left at the bottom?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

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.