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Physics: Post your doubts here!

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Thought blocker said:
s05 :¬
14)
untitled-png.44408


24)
This concerns values you need to keep in memory unless they are on the data sheets, i'm not sure. Either ways, visible light falls in the range of
400 nm< λ < 700 nm. We can take any value in this range to represent out wavelength. Suppose we take 600 nm.
Then, the number of wavelengths in 1 meter = 1 / (600 * 10^-9) = 1.6667 * 10^6. So our answer is closest to B. Therefore, that's our answer.

36)
V=IR

total rsistance=450
voltage=6
V=IR
I=>6/450=0.013

VOLTAGE IN 180 resistor
V=IR
V=0.013*180=2.4 volts

Or simply do proportionaly= 180/450 * 6
=2.4

w05 :¬
30)
Electric field lines go from + to -, so the +ve particle will move down towards the -ve side.

s06 :¬
9)
when the mass is at the lowest point, its kinetic energy = 0.
hence its velocity is also = 0 m/s
that means, either B or D.
since the first part of the graph shows the "UPWARD" velocity of the mass, hence the ans is D

w06 :¬
21)
17.5 *10^6 = 830*g*h + 1000*g*h
17.5 * 10^6 = 8142.3x + 9810(2000 - x)
17.5 *10^6 = 8142.3x + 19 620 000 - 9810x
-2 120 000= -1667.7x
1271.2 = x
~ 1270 m (3 s.f.)

s07 :¬
20)
X is in tension as it is opposing the weight of the horizontal bar and the foce W...Y is aso in tension as it is opposing W..Z is in compression as it is between a force from X and a force of Y and W

w07:¬
11)
q11-png.44357


s08 :¬
14)
moment = force x distance
clockwise moment = anticlockwise moment
W x a + F x h = W x 2a

16)
Potential energy decrease.
There is no work done from bringing the positive charge vertically.

w08 :¬
32)
All the wires are connected in parallel.
So 1/R = (1/10)X6 + 1/100
Therefore, 1/R = 61/100
R = 100/61 = 1.6 ohms.

s09:¬
18)
pressure = hdg. But here h is 2h since on one side liquid rises by h and another side liquid falls by h.

w12_11 :¬
10)
earth has atmosphere...air present so deviated path
on moon there is no air resistance so perfect semicircle...

29)
Very simple concept. Read your text book.
Click to expand...



Thank you soo much :)
 
Thought blocker

Thought blocker

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