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Question No1

Which weighs more, a liter of ice or a liter of water?

Solution

Liter of water has more weight as compared to ice because it freezes making a given volume of ice lighter than the same amount of water. That is why ice floats in water.

 

Question No:

Will the current in a light bulb connected to a 220-V source be greater or less than when the same bulb is connected to 110-V source?

Solution

 Greater, because current is directly proportional to voltage. I =V / R

 

Question No

How is the wavelength of light related to its frequency?

Solution

c = lambda times f

f = c / lambda

Scroll down to related links and look at "Conversion: frequency f to wavelength lambda and wavelength to frequency"

 

Question No.

We don't notice the de Broglie wavelength for a pitched baseball. Is this because the wavelength is very large or because it is very small?

Solution

We don't notice the de Broglie wavelength for a pitched baseball because the wavelength is very small

 

Question No                                                                         

Does every magnet necessarily have a north and south pole? Explain

Solution                                                                                

Yes every magnet necessarily has a north and south pole. The poles reaction to each other cause the magnet to attract

 

Question (Marks: 5)

Consider a lamp hanging from a chain. What is the tension in the chain?

Solution

As always, begin with a "free body diagram". Tension T acts upward on the lamp while the force of gravity pulls down with force w, the weight of the lamp. The net force is the vector sum of these two forces. The lamp is not accelerating so the force up must equal the force down. In terms of magnitudes, this means

T = w

 

 

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Replies to This Discussion

the following link provide you help in solving of objective of phy101.

 

http://mavdisk.mnsu.edu/jpierce/courses/p101/questions.html#A

great champ
ya chk karing niloforrrrrrrr

gr8 chowder..

i am really so happy..khushi hoti hai k chalo koi to help krta hai na phy101 may.

warna is subject ki koi help kahi se nai milti hai

ANSWER 2 WRONG HAI

Question no2 i = v/r

Suppose ' r ' is constant i:e 10

So i = 220/10 = 22

    i = 110/10 = 11

CURRENT IS DIRECTLY PROPORTIONAL

                 NOT INVERSELY

Thus current is LESS when voltage is less

        current is MORE when voltage is more

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