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Physics MCQs thread.

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for q.27 in up u should mugup the wavelength of electomagnetic waves
for 14in down
total work=gain in pe +work by friction
so u will get D
 
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Can someone pls show me the working? I tried the principle of moments, but it doesn't work!
 
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for uniform object its geometric centre is in its c.g so weight acts from 1.25m away from pivot
so taking moment about the pivot
w*1.25=300*2
so w=480
its B
 
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how do I solve this?
 

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ShootingStar said:
pls explain this question to me :unknown:
Total pressure = 17.5MPa
total pressure = pressure of oil + pressure of water
17.5 * 10^6 = 830*g*x + 1000*g*(2000-x)
solve it
x = 1270 (D)
 
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Mobeen said:
Saturation said:
isn't the center 1.5m ?
the total lenght is 2.5 .. and the weight acts at the centre . centre is at 2.5/2 = 1.25

omg! I didn't notice that! I thought that the total length was 2.5 + 0.5 ! I should look at the markings more often! :%) :)
 
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A submarine descends vertically at constant velocity. The three forces acting on the submarine
are viscous drag, upthrust and weight.
Which relationship between their magnitudes is correct?
A weight < drag
B weight = drag
C weight < upthrust
D weight > upthrust
 
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for constant velocity a=0
so f=w-d-u(d is drag force u is upthrust w is weight f is net force)
0=w-d-u
w=d+u
so w>u option D
have u understand if u know ans of my q. of two tubes plz , help me..
 
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