NY wrote:

"Clive George" wrote in message
o.uk...
On 26/05/2017 08:55, Robin wrote:
There were more than one question however where there seemed to be
insufficient information.

The car skid for example.

Also the capstan.

The one with the weight hanging off rope at the top of the well? There's
enough information there.


Here are my answers with reasoning:

snip
33. S closest to centre so he's exerting least turning moment to overcome
whatever the capstan is turning
34. X resultant force is midway between directions of pushing forces
35. smallest radius of curvature so greatest (mv^2)/r centripetal force
(assuming all cars doing same linear speed)
36. H
37. one ball hits the group of four so one ball leaves group (as for
Newton's Cradle)
38. all equal
39. opposite, unevenly (won't jam because ends of rod are 180 deg out of
phase so no vertical component to motion)

I'm open to argument/correction on some of them!

33 He is doing the same amount of work (force X distance moved)
wherever on the capstan he pushes. If they meant force they should
have said so.

--

Roger Hayter