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A-Level Physics Paper 1 doubts (MCQ)

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NidZ- Hero:
So yu mean to say for the above explanation we read the graph from opp direction lke from D

NidZ- Hero:
http://www.freeexampapers.com/past_papers.php?l=Past_Papers%2FA+Level%2FPhysics%2FCIE%2F2009+Nov/

Question 13

elemis:

--- Quote from: NidZ- Hero on June 04, 2011, 05:15:55 pm ---http://www.freeexampapers.com/past_papers.php?l=Past_Papers%2FA+Level%2FPhysics%2FCIE%2F2009+Nov/

Question 13

--- End quote ---

Which variant ?

Ghost Of Highbury:
Im not sure about variant 1. The torque is obviously 4.5Nm
{Tension = Torque/diameter = 3/0.1 = 30
  Torque = tension*diameter = 30*0.15=4.5}

Although, i'm not sure why the tension is 60. Maybe, because the lower belt has no tension, and for a torque two forces acting in opposite directions
are required, I guess, the tension in the lower belt is transferred to the upper belt which adds up to 60 (30+30).

The projectile one is easy
Let's say the initial velocity of the projectile is u
The velocity at highest point is horizontal with velocity ucos 45

KE = 0.5m*(ucos45)^2 = 0.5m*u^2*0.5
0.5E

NidZ- Hero:

--- Quote from: Ari Ben Canaan on June 05, 2011, 05:46:54 am ---Which variant ?

--- End quote ---

Variant 11

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