A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it?

1) A meter scale 2) A vernier calliper where the 10 division in vernier scale matches with 9 division in main scale and main scale has 10 division in 1 cm 3) A screw gauge having 100 divisions in the circular scale and pitch as 1 mm 4) A screw gauge having 50 divisions in the circular scale and pitch 1 mm  

A position-time graph for a particle moving along the x axis isshown in the figure. The divisions along the horizontal axisrepresent 1.00 s and the divisions along the vertical axisrepresent 5.0 m.

(a) Find the average velocity in the time interval t = 3.00 s to t= 8.00 s.

(b) Determine the instantaneous velocity at t = 4.00 s (where thetangent line touches the curve) by measuring the slope of thetangent line shown in the graph.

(c) At what value of t is the velocity zero?

Where the voltage division problem arises?

Where the current division problem arises?