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Physics: Post your doubts here!

F

Faaiz Haque

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usama321 said:
4 Period is the time taken for one complete oscillation. Now, one complete oscillation would be the time taken between two successive crests. Let's take the crests as the peak of the wave on the graph. Travelling horizontally, it takes 4 block till the next peak. So, 2.5 * 4 = 10. Looking at the vertical axis, we can see that the peak voltage is about a bit more than 3 blocks from the horizontal axis. As each block represents 5mV, 17 would be our answer. It cant be 25 because that would require 5 blocks. Answer C

7. Both the other quantities are velocities. Thus X should represent the velocity due to the force F. Answer is thus C, as product of a and t would give us the velocity due to that acceleration for the specified time.

13 Resolve the forces perpendicularly to the beam. 8 * sin60. Now just multiply it by the length of the beam as it is a couple. 8 *sin60 * .6 = 4.15 = B

19 1/2 * force* extension... force = 2N. Extension = 0.9-0.5 = 0.4 Answer A

26 lamdba = ax/d... increasing lambda would increase the fringe spacing according to the formula, and as red light has a higher wavelength than violet light, the answer is D

33 I've explained this type of question a couple of times. Just scroll back a few pages and you will find the solution.

36 Terminal potential difference is the PD of the battery after we have taken account of the internal resistance. First find the current in the circuit with V = IR
I =3/6 = 0.5 A. Now calculate the PD due to internal resistance. V = 0.5 * 2 = 1V. Subtract this from the EMF and we have our terminal voltage = 2V. Output power = IV = 0.5 * 2 =1 answer is C
Click to expand...
Thanks a lot this was very helpful I just couldn't find where you explained question 33
 
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