106please answer not increase got exams tomorrow.
Q1. prove that when ice will melt, the water level will not increase.
Q2. Which one is heavier in air - 1kg cotton or 1kg iron?
Q3. A boat with scrap iron in it is floatng in a lake. If the iron is thrown in the lake, what will happen to water level of the lake?
Q4. A man is floating on a rubber tube which is floating in a bath tub. If the man drinks some water from the tub, will the level of wtare in the tub decrease?
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31 Answers
11You will find the word in the final few posts in the thread titled "Colours Again!"
106just want the answer, because ans is given it will decrease.
1comint to TINGING,aragorn in which topic did u find this word? i have never heard about it.
11Can't you see Honey, we are solving his problem by increasing it [6]
106Q5. Why do two row boats moving near each other along parallel paths in the same direction are pulled towards one another?
Q6. What will happen if a stream of air is blown through a jet under one of the pans of a physical beam balance in equilibrium?
Q.7 Explain how a sailboat can be propelled by air blown at the sails from a fan attached to the boat?
Q8. Why is a rifle bullet cylindrical?
P.S got exams tomorrow and these questions are for revision. So please reply asap. all questions are from the chapters mentioned in the topic.
1sorry for increasing the list but i think everyone should learn all such questions from this thread
1Q11)each moleculeof a gas f degrees of freedom d ratio Cp/Cv =γ fr d gas is
Q12)equal masses of 3liquids ABC have temperatures 100 c, 250c & 400c respectively if A&B r mixed d mixture has a temperature of 150C if B& C r mixed d mixture has a temperature of 300C if A&C r mixed d mixture will have a temperature of
17.) LOL , they form a system dear , and hence the internal action and reaction forces won't change the net momentum of the system .
11Sky, are you telling that row boats can generate magnetic fields? [3]
1take my question also
Q9)if you stand barefeet daytime on the sand near by the shore of the pond .what do you observe?
as you move in shallow water , it feels comparitively cooler
how does this happen?
18) To prevent magnus effect
i.e. if it is of any other shape like round it will be deviated 4m itz virtual path of flight,.........so to prevent it......
12.) Concept : Weight = Apparent wt. of a body in air. (if you are not considering vacuum) . Volume of 1 kilo of cotton is >> vol of 1 kilo iron.
Cotton will displace greater amt of air , so it will weigh lesser . But if you are to consider vacuum , cotton will definitely weigh greater (as there is no buoyancy)
4.) no it wont happen in that manner as the man drinks some water , his weight will increase and will thus dispalce same amount of water , so it will keep the water level same .
(Considering losses by evaporation as negligible :P )
11]
No...water level does not change...even if ice is less dense than water..
See when ice is floating the volume displaced is equal to the equivalent mass of water...
and now when ice melts the volume occupied is exactly equal to the initially displaced wter...soi no change in water level
Mathematically...
if density of ice=0.9
volume immersed=0.9H
now when this melts, mass of water=
0.9H/0.9
=H
so volume remains same