Author Question: If you pound a feather with a hammer, which one feels a greater force? A) always the feather B) ... (Read 143 times)

debasdf · **on:** Jul 29, 2018

If you pound a feather with a hammer, which one feels a greater force?

A) always the feather
B) always the hammer
C) The size of the force is always exactly the same on both of them.
D) If the feather moves, then it felt the greater force. Otherwise the force was the same on both.

Question 2

In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at varying distances.

Over what range must a lens of 45 mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 1.4 m from the camera? A) 1.49 mm
B) 1.20 mm
C) 4.48 mm
D) 5.98 mm
E) 2.09 mm