##### Get a free home demo of LearnNext

Available for CBSE, ICSE and State Board syllabus.
Call our LearnNext Expert on 1800 419 1234 (tollfree)
OR submit details below for a call back

clear
searchtune

Jul 12, 2014

#### Find the dimensions of constant a and b occurig in van der Waal's equation . [p+a/v2][v-b]=RT



(P + a/V2) (V - b) = RT
P is pressure, V is volume and T is temperature.
[P] = [F/A]&#...

Jul 16, 2015



Jun 13, 2014



Dec 24, 2014

#### what are the uses of geostationary and polar satellites? what are their advantages ?



A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers directly over the...

Feb 4, 2015

#### HOW DOES THERMOS FLASK MINIMISE HEAT TRANSFER BETWEEN THE CONTENTS OF THE BOTTLE AND OUTSIDE?



The thermos flask consists of a double-walled glass vessel resting on a cork inside a metal or plastic case. The outer surface of its inner wall and the inner surface of its outer...

Mar 6, 2015

#### A body cools from 80 °C to 50 °C in 5 minutes.  Calculate the time it takes to cool from 60°C to 30 °C.  The temprature of the surroundings is 20°C.



According to Newton's law of cooling, we have

mc (T1 - T2)/t = k [(T1 + T2)/2   -  T0)]        -----------...

Apr 25, 2014



Jul 12, 2014

#### Write the dimensional formula of a/b in the relation f=a√x+bt2 where f=force,x=distance,t=time.



f = a√x + bt2, where [f] = [M L T −2], [x] = [L] and [t] = [T].

LHS is force. So both the terms on the RHS have the dimensions of force.

[f] = [a&...

Apr 17, 2015

#### What is parallax method? and Error?



Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured ...

Dec 1, 2014

#### If the radius of the earth is to shrink by 1% (mass remains the same) the acceleration due to gravity g on the Earth's surface will increase by how much % ?



The acceleration due to gravity g = GM/r2 = 9.8 m/s2

If r reduces by 1%, the new radius becomes r' = 99% of r = 99r/100 = 0.99r

New acceleration due to gr...

Filters