Monday

April 21, 2014

April 21, 2014

Total # Posts: 32

**physics conduction**

a one brick thick wall of 10cm thickness has temperatures 40deg C and 5deg C at the surfaces. if the thermal conductivity of the brick is 0.6W per m per K, what is the rate of heat flow per unit area W per m square through the bricks if steady state conditions apply? explain w...

**physics**

thanks so much :)

**physics**

why when steady state conditions apply the rate of heat flow is the same?

**physics(heat)**

thank you so much :)

**physics(heat)**

A geyser heats water flowing at the rate of 3L/min from 27 deg C to 77 deg C. if the geyser operates on a burner, what is the rate of combustion of the fuel if its heat of combustion is 40000J/g?

**physics(heat)**

A geyser heats water flowing at the rate of 3L/min from 27 deg C to 77 deg C. if the geyser operates on a burner, what is the rate of combustion of the fuel if its heat of combustion is 40000J/g?

**physics(heat)**

a mixture of 250g of water and 200g of ice at 0deg C is kept in a calorimeter which has a water equivalent of 50g. if 200g of steam at 100deg C is passed through this mixture, calculate the final temperature and the mass of contents of the calorimeter. ans 572.22g please expla...

**physics**

A stone is thrown from a building of height 40m and reaches a maximum height of 49m from the ground. The stone strikes the ground at a distance of 10m from the foot of the building. find the angle of elevation from which the stone is projected. Assuming the ground level is hor...

**maths**

thnaks :)

**maths**

If the pth term of an AP is q and the qth term is p, prove that its nth term is (p+q-n).

**physics**

two children ride bicycle towards each other with instant velocity of 20m/s and 10m/s. Each child releases a ball 6m above the ground with forward horizontal velocity of 40m/s relative to the bicycle. if the two balls collide in above the ground. what was the seperation when t...

**physics**

thanks :)

**physics**

a metal cylinder containing water at 60ged C, has a thickness of 4mm.And the thermal conductivity 400W per m per K. it is lagged by felt of thickness 2mm and thermal conductivity 0.002W per m per K. the room temperature is 10deg C.Find the temperature gradient g for for the me...

**kinetic theory**

thank you soo much :)

**kinetic theory**

Air is filled at 60deg C in a vessel of open mouth. Upto what temperature should the vessel be heated so that one-fourth of the air may escape? Ans 171degC

**projectiles**

sorry ''in'' isnt there!

**projectiles**

two children ride bicycle towards each other with instant velocity of 20m/s and 10m/s. Each child releases a ball 6m above the ground with forward horizontal velocity of 40m/s relative to the bicycle. if the two balls collide in above the ground. what was the seperation when t...

**physics**

thnakss soo much

**physics**

Two projectiles A and B are projected at the same time in the same vertical plane. A is projected at a height of 2m above the ground making an angle of 30deg with the horizontal. B is projected with the velocity of 20m/s at an angle of 60deg with the horizontal. If they collid...

**physics**

hmmm...ok thanks :)

**physics**

are you sure we can use length of the string 1m as the radius? and why?

**physics**

no the answer is 1.6 revolutions per second

**physics**

an object of mass 0.1kg is rotated in a horizontal circle by a string 1m long. the maximum tension in the string before it breaks is 50N.what is its maximum frequency reached?

**physics**

thanks alot...it was an easy method :)

**physics**

The length l of a simple pendulum is about 0.5m, and can be measured within 1mm. what accuracy is required in the measurement of periodic time T of 100 oscillations if the error in l and T are to produce equal percentage in the calculation of acceleration due to gravity (g)

**Physics 30**

given; u=30km/hr=30*10/36=8.33m/s v=50km/hr=50*10/36=13.88m/s a=2.5m/s^2 a=(v-u)/t t=5.55/2.5 =2.22s so the answer is a

**physics**

while standing on an open truck moving at a velocity of 35m/s, a man sees a duck flying diresctly overhead. The man shoots an arrow at the duck and misses it.. the arrow leaves the bow at a vertical velocity of 98m/s. the truck accelerates to a constant speed of 40m/s in the s...

**Physics**

Ok. The answer is 32.53m And i got that. I didn't use the L equation Instead i found the time taken to reach h=0m then found R using R=(VoCosα)t THANK YOU ALL SOO MUCHHH!!!! IT WAS GIVING ME A TOUGH TIME! :)

**Physics**

A ball is thrown towards a vertical wall from a point 2m above the ground and 3m from the wall. the initial velocity of the ball is 20m/s at an angle of 30deg above the horizontal. if the collision of the ball with the ball is perfectly elastic. how far behind the thrower does...

**physics**

thanks :)

**science**

what is the importance of food?

**social science**

Ways to protect the monuments like Konark,khajuraho,Sanchi,Ajanta&Ellora.(Aiso give need to preserve and protect the monuments.) Monuments can be protected by limiting tourists, keeping cars, trucks, and buses as far away as possible, and protecting the monuments from the the ...

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