The focal lengths of the objective and eyepiece in a compound ...

[kaid0807]

The focal lengths of the objective and eyepiece in a compound microscope are 0.8 cm and 2.5 cm, respectively. The image formed by the objective is 16 cm from it and the final image is 25 cm from the eye. What is the total magnification?
 
  A) -19.0
  B) -11.0
  C) -2.0
  D) -100
  E) -200

Question 2

Consider a bicycle wheel to be a ring of radius 30. cm and mass 1.5 kg. Neglect the mass of the axle and sprocket.
 
  If a force of 20. N is applied tangentially to a sprocket of radius 4.0 cm for 4.0 s, what linear speed does the wheel achieve, assuming it rolls without slipping?

[sultana.d]

Answer to Question 1

E

Answer to Question 2

7.11 m/s

[kaid0807]

Both answers were spot on, thank you once again

[sultana.d]

Great! Please up vote