Q. A pulse of sound wave travels a distnce l in helium gas in time T at a particular temperature. If at the same temp. a pulse of sound wave is propagated in oxygen gas, it will cover the same distance l in time---------(Ans:3T)

Q.A transverse wave y=0.05sin(20x-50t) in meters,is propagating along +ve X-axis on a string. A light insect starts crawling on the string with the velocityof 5 cm/s at t=0 along +ve X-axis from a point where x=5cms. After 5 sec the difference in the phase of its position is:-------------                                                                                        (Ans:-245 pi)

I think u are right but 0 is not even in the options.

Q1 Consider atriangle ABC with G as its centroid. If vectors GB and GC are inclined at an obtuse angle,then prove that 5a²>b²+c².

Q2 If  IS THE AREA OF A TRIANGLE ABC and length of its two sides are 3 and 5. If c is the third side then prove that:           

<=c²+16c+64/12root3

SALUTES ASSURED TO ALL CORRECT SOLUTIONS.

Q. A pulse of sound wave travels a distnce l in helium gas in time T at a particular temperature. If at the same temp. a pulse of sound wave is propagated in oxygen gas, it will cover the same distance l in time---------(Ans:3T)

Q.A transverse wave y=0.05sin(20x-50t) in meters,is propagating along +ve X-axis on a string. A light insect starts crawling on the string with the velocityof 5 cm/s at t=0 along +ve X-axis from a point where x=5cms. After 5 sec the difference in the phase of its position is:-------------                                                                                        (Ans:-245 pi)

SALUTES ASSURED TO ALL CORRECT SOLUTIONS.

What is thermal capacity?????????????

The answer to the first ques. is 8LT.

Come on goiitians, try it!!!!!!!!!!!!!!!!!!

Come on goiitians, try it!!!!!!!!!!

Yes, u are correct. cud u plz tell me how u got the ans?

HOW???

But the answer is (m₂/m₁)².

Q1 A pointer attached to one prong of a tuning fork just presses against a plate and 30 complete waves were counted by the time the plate fell by 0.1 m.Calculate the frequency of the prong.

Q2 The fundamental frequency of a closed organ pipe is 400 Hz. If a hole be made 10 cm below the open end,



       what will be the fundamental frequency?

Q3 For y= acos(kx)cos(wt), find the shape of graph of:

      a) Change in pressure of the medium at t=0.

      b) Density of the medium at t=T/2.

    SALUTES ASSURED TO ALL CORRECT ANSWERS.

Q. Two spheres of radii R1 and R2 have densities d1 and d2 and specifc heats C1 and C2. If they are heated to the same temp., the ratio of their rates of cooling will be ---------------.

Q. A double star is a system of two stars(say having masses m1 and m2) moving around the centre of inertia of the system due to gravitation. Then,ratio of sweeps of area osf star of mass m1 to the star of mass m2 is ----------------------------.

Q1  A square frame of side L is dipped in a liquid soap solution. When it is taken out of the liquid, a soap film is formed on it. If the surface tension of soap is T, then the force acting on the frame is -----------

Q2  16 cm3 of water flows per sec thru a capillary tube of radius 'a' and of length l and when connected to a pressure head of h cm of water. I f a yube of same lengthand radius a/2 is connected to the same pressure head ,the quantity of water flowing thru the tube per sec will be -----------------.

             5 SALUTES ASSURED TO ALL CORRECT SOLUTIONS!!!!!!