Saturday

April 25, 2015

April 25, 2015

Total # Posts: 15

**physics **

an object is placed 15 cm in front of a convex lens of focal length 10cm. Find the nature and position of the image formed. where should a concave mirror of radius of curvature 20cm be placed so that the final image is formed at the position of the object itself.
*March 9, 2015*

**maths**

if the LCM of first 20 natural numbers is X, then what will be the LCM of first 25 natral numbers
*March 23, 2013*

**3rd grade math**

A.
*March 20, 2013*

**maths --plse help me..**

The angle of elevation of the top of a tower as observed from a point on the ground is alpha and on moving a meters towards the tower, the angle of elevation is beta .prove that the height of the tower is a (tan alpha*tan beta)/(tan beta - tan alpha)
*December 13, 2012*

**maths --plse help me..**

The pilot of an aircraft flying horizontally at a speed of 1200 Km/hr observes an angle of depression of a point on the ground changes from 30 degree to 45 degree in 15 seconds. Find the height of the aircraft at which it is flying?
*December 13, 2012*

**maths**

Let a,b,c be positive integers such that a divides b^2 , b divides c^2 and c divides a^2 . Prove that abc divides (a + b + c)^7 .
*December 9, 2012*

**maths --plse help me..**

Let a,b,c be positive integers such that a divides b^2 , b divides c^2 and c divides a^2 . Prove that abc divides (a + b + c)^7 .
*December 9, 2012*

**maths -profit and loss**

The profit on a certain item is 20%. If the CP is increased by Rs 50 and SP is increased by Rs 30 then the profit 5 reduces by 3 1/3%. Find the original CP and SP.
*December 4, 2012*

**maths-probability**

plse explain me again..
*December 4, 2012*

**maths-probability**

if a cube of 10 X 10 X 10 is slices into 1 X 1 X 1 cubes and then rearranged as earlier.if the outer most layer of cubes fall, how many cubes fall and how much are left....?
*December 4, 2012*

**maths**

Find a30 -a20 for the AP a, a+d, a+2d, a+3d........
*December 4, 2012*

**physics**

on a cool night with no wind, people facing a campfire feel a breeze on their backs explain
*October 7, 2012*

**chemistry **

N2+ 3H2 GIVES 2NH3 = -90.5 4NH3+5O2 GIVES 4NO+6H20 =-905.1 H2 +0.5 O2 GIVES H2O =-241.1 USE THESE VALUES TO DETERMINE ENTHALPHY CHANGES
*September 28, 2012*

**college-physics**

how to write scientific report on physics
*September 19, 2012*

**college-chemistry**

calculate the ph of a buffer solution prepared by adding 0.397 mole of the sodium salt of a weak organic acid HA to 0.474 L of 1.023m acid HA with pka=4.82 and diluting to 1.00 L WITH WATER
*September 18, 2012*

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