A skydriver of mass 80 kgs jumps out of a plane. (a) ignoring air resistance, draw a free body diagram with all forces acting on the sky driver.

(b) Now, suppose that the air resistance increases as the speed of the skydiver increases, draw
the forces acting on the skydiver 3 seconds later, assuming that the skydiver's acceleration is
1 m/sdownwards at this instance. (2 marks)

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.

Whithin which type of system is neither the total mass nor the total energy conserved ? a. open b. connected c. isolated d. closed

Two lasers are shining on a double slit, with slit separation d. laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. the lasers produce separate interference patterns on a screen a distance 5.30 m away from the slits. part a which laser has its first maximum closer to the central maximum? view available hint(s) which laser has its first maximum closer to the central maximum? laser 1 laser 2