A student designs an experiment using an ideal gas, as shown here. Which variable change would most likely increase the volume of the system, as shown in the image?
A) decreasing both the pressure and the temperature
B) decreasing the temperature while increasing the pressure
C) decreasing the pressure while increasing the temperature
D) increasing the pressure while holding the temperature constant

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.