JPJC 2026 Quantities and Measurement Assignment

1 JURONG PIONEER JUNIOR COLLEGE 9478 H2 PHYSICS/8867 H1 PHYSICS QUANTITIES AND MEASUREMENT ASSIGNMENT 1 The force F between two long, thin and parallel current carrying wires is given by 12 2 o LF d  = II where 1I and 2I are the currents in the wires, L is their length and d is their distance apart. Determine the base units of o . [3] 2 The power P required by a helicopter to hover in air is th ought to depend on the vertical upwards force F provided by its blades, the length of the blades L and the density of the air  , according to the relationship below. w x yP kF L = where k is a dimensionless constant Using unit analysis, determine the values of the constant w, x and y. Show your working clearly. [4] 3 Three coplanar forces act at the point O as shown in Fig. 3.1. Determine (a) the resultant horizontal force, [1] (b) the resultant vertical force. [1] Hence, calculate the resultant force acting on point O. [2] Fig. 3.1 X Y O 30 60 4.0 N 5.0 N 3.0 N