6. n(ri)
- sin i /sin r
- sin r/sini
- sin c/t
- sin r/ t
7. charge
- i/t
- i*t
- p*t
- p/r
8. wave speed
- f*w
- w/t
- f/w
- w*t
9. force
- p/t
- a*p
- a/p
- p*d
10. density
- v/g
- v*m
- m/v
- g*m
11. force=
- w/a
- a*w
- m*a
- m/a
12. power
- t/e
- w/t
- w*t
- w*t
13. critical angle
- 1/n
- n*10
- e/n
- f/n
14. power=
- r/i
- i*v
- v/i
- i*t
15. energy transferred
- v*i/p
- v*i*t
- v/i*t
- p*i
16. gpe
- h/mgt
- mgh
- mg/h
- t/hmgv
17. speed=
- d/t
- v-u/t
- d*t
- v/t
18. acceleration
- v*t^2
- t/v-u
- v-u/t
- v/t
19. frequency
- 1/r
- 6/t
- 1/t
- 4/p
