# Posts by help me out it's urgent

Total # Posts: 15

**physics**

1.Give examples of a one-dimensional motion where (a) the particle moving along positive x-direction comes to rest periodically and moves forward. (b) the particle moving along positive x-direction comes to rest periodically and moves backward. 2.Give example of a motion where...

*October 14, 2012*

**physics**

1.In one dimensional motion, instantaneous speed v satisfies 0 ≤ v < v0. (a) The displacement in time T must always take non-negative values. (b) The displacement x in time T satisfies – vo T < x < vo T. (c) The acceleration is always a non-negative number...

*October 14, 2012*

**trignometry**

show that cos2x=1-tan^ 2 x /1+tan^2x=2cos^2x-1

*October 6, 2012*

**maths**

can you help me with this? cos2A=cossquareA-sinsquareA/cossquareA+sinsquareA=cossquareA(1-tansquareA)/cossquareA(1+tansquareA) I encountered this situation while solving trignometric problem.can you tell how does this come?

*October 6, 2012*

**physics**

A car accelerates from rest at a constant rate A for some time after which it retards at a constant rate B to come to rest. If the time elapsed is T second,calculate the maximum velocity reached?(please try solving this problem by plotting velocity time graph and if you can ...

*September 30, 2012*

**physics**

A car accelerates from rest at a constant rate A for some time after which it retards at a constant rate B to come to rest. If the time elapsed is T second,calculate the maximum velocity reached?(please try solving this problem by plotting velocity time graph and if you can ...

*September 30, 2012*

**math**

Is g = {(1, 1), (2, 3), (3, 5), (4, 7)} a function? Justify. If this is described by the relation, g (x) = αx + β, then what values should be assigned to α and β?

*August 16, 2012*

**physics**

Measure of two quantities along with the precision of respective measuring instrument is A = 2.5 m s–1 ± 0.5 m s–1 B = 0.10 s ± 0.01 s The value of A B will be (a) (0.25 ± 0.08) m (b) (0.25 ± 0.5) m (c) (0.25 ± 0.05) m (d) (0.25 &...

*August 16, 2012*

**physics**

The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is (a) 164 ± 3 cm2 (b) 163.62 ± 2.6 cm2 (c) 163.6 ± 2.6 cm2 (d) 163.62 ± 3 cm2 please explain me ...

*August 16, 2012*

**physics**

1.The potiential energy of a particle varies with distance x from a fixed origin as v=A√x/x+B where A and B are constants.Find the dimensions of AB. 2.The refractive index of a material is given by the equation ʯ=A+B/ʎsquare where A and B are constants,ʎ ...

*July 30, 2012*

**biology**

what is the need for vertebrates to evolve from oviparity to viviparity?

*April 22, 2012*

**biology**

A farmer buys a land.There were lots of insectivorous plants in it.He was unaware of this,but when he came to know this he decided not to cultivate any crops and return the land.What could be the reason behind this decision?

*April 22, 2012*

**maths**

D,E,F are the midpoints of a triangle ABC then what is the area of triangle DEF?

*March 26, 2012*

**math**

If a-b=3,ab=7,then(a+b)is _______

*March 26, 2012*

**math**

a hemispherical bowl of radius r cm is filled with water.a sphere of radius r/2 cm is immersed in it.show that the volume of water displaces is pie r square/2 c.c.

*March 14, 2012*

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