Write the type (s) of energy found in the following examples: i. kerosene which energy found
ii. stretched rubber
iii. water stored in a reservoir iv. bread
V. rolling stone
vi. red hot iron
vii. pendulum clock
viii. falling apple
ix. leg lifted to kick a football
x. dry cell

Explain vector addition, triangle method and parallelogram method

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s