A student investigated how length affects resistance of a wire. Figure 1 shows the circuit the student used.
The student took measurements using the meters X and Y.
Name meters X and Y. The table shows the results. For which length of wire are the readings of resistance most precise

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.