Two wires p and q have resistance rp and rq.wire p is twice as long as wire q and has twice the diameter of wire q.the wire are made of same material.what is ratio of rp/rq?
Answers
Answer:
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Answer:
Object is thrown into the air.
Which graph shows how potential energy Ep of the object varies with height h above the ground?
Reference: Past Exam Paper – November 2008 Paper 1 Q16
Solution 528:
Answer: A.
The height above the ground is h. So, as h increases, the position of the object above the ground is higher.
Potential energy Ep = mgh
Thus, as h increases, the potential energy Ep also increases and the increase is linear since the power of h is 1 (Ep = mgh1).
Question 529: [Waves > Intensity]
Light wave of amplitude A is incident normally on surface of area S. Power per unit area reaching the surface is P.
Amplitude of light wave is increased to 2A. Light is then focussed on to a smaller area 1/3 S.
What is the power per unit area on this smaller area?
A 36P B 18P C 12P D 6P
Reference: Past Exam Paper – June 2013 Paper 11 Q24