PHY 220 Basic Physics for Biological & Earth Sciences CA 2021

Extrait du sujet

1. A place-kicker must kick a football from a point 36.0m from the goal, and half the crowd hopes the ball will clear the crossbar, which is 3.50m high. When kicked, the ball leaves the ground with a speed of 20.0m/s at an angle of 40 ◦ to the horizontal. a) By how much does the ball clear or fall short of clearing the crossbar? b) Does the ball approach the crossbar while still rising or while falling?

2. a.

   What is electrostatics? (2mks) b) State three important properties of electric field lines. (3mks) c) Why is a test charge usually very small and positive? (2mks) d) Distinguish between conservation of charge and quantisation of charge. (3mks) e) State the following electrostatic laws: Coulomb’s law, Gauss’ law. (4mks)