6. What effect would the following changes have on a conductor's resistance? In each situation, explain why the change occurs. (a) decreasing the diameter of a conductor (b) placing an extension cord outside in the winter (c) plugging two identical extension cords together to make it longer

Calculate the following: 1.1.1 The resultant velocity in magnitudo and direction 1.1 .2 The distance the ship will cruise in 5 hours

A car with a mass of 800 kg accelerates uniformly from rest to \( 100 \mathrm{~km} / \mathrm{h} \) for 8 seconds up an incline that makes an angle of \( 30^{\circ} \) with the horizontal. The frictional resistance is 280 N . Calculate: 3.2.1 The work done against the frictional force when the velocity reaches \( 100 \mathrm{~km} / \mathrm{h} \) \( \begin{array}{l}\text { The work done against the gravitational component parallel to } \\ \text { 3.2.2 the plane }\end{array} \)

9. A 0.13 kg puck is moving in a circular path on a horizontal air table where friction is negligible. The centripetal force is provided by a cord 0.68 m long attached in the centre of the air table. If the tension in the cord is 2.5 N , what is the speed of the puck?

3.1 A truck with a mass of 1 ton is moving at \( 80 \mathrm{~km} / \mathrm{h} \) on a horizontal plane and braked to rest over 40 m . Calculate the following: 3.1.1 The deceleration 3.1.2 The braking force

Find the dimension of gravitational cons tant and pressure