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# School

Define transverse wave with example .

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A Avinash Dongre
Transverse waves - In these types of waves, the particles of the medium vibrate in a direction perpendicular to the direction of propagation of the wave. e.g.wave produced in a long string when one end is fixed.
# School

6+( 5 - 4 + 2 ) is

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S safeer
6+( 5 - 4 + 2 ) =6+(1+2)=6+3=9
# School

Find the ratio between 100 ml and 2l

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S safeer
To find the ratio first we have to convert to the same units 2l = 2 x 1000 ml = 2000 ml So the ratio is 100/2000 = 1/20
# School

Sin20⁰ tana sec70⁰≈√3. find A

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S safeer
sin 20 = cos 70 since sin x = cos (90-x) Also sec 70=1/cos70 using above results
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# School

Find the area of a rectangle of length 20cm and breadth 40 cm

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S safeer
length=20cm breadth = 40cm area of rectangle= length x breadth=20 x 40 = 800 cm2
# School

what is 582,030 in word from.

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S safeer
five lakh eighty-two thousand and thirty
# School

Why they multiply with pls

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S Shubham Krishnan
we have multiplied with 1.6 x 10-19 because it is the value of e and 106 is the value of megavolt to volt.
# School

A solid ball of radius R has a charge density \rho given by \rho=\rho _{0} (1-r/R) for 0 ≤ r ≤ R. The electric field outside the ball is :

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S safeer
  Total charge on sphere:
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# School

 In the given circuit for what value of X the net resistance between A and B is 50 ohm

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S safeer
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# School

The effective resistance between the terminals X and Y is. The resistance is in ohms

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S safeer
Three 5 ohm resistance are in series, which is parallel to 10 ohm The equivalent resistance is  R= (15 x 10) / 25 = 6 Ohm
# School

Due to heavy floods in a state, thousands were rendered homeless, 50 schools collectively offered  to the state governments to provide the place and the canvas for 1500 tents to be fixed by the government and decided to share the whole expenditure equally The lower part of each tent is cylindrical of base radius 2.8m and height 3.5, with the conical upper part of the same base radius but of height 2.1m. If the canvas used to make the tents cost 120 per sq.m, find the amount shared by each school to set up the tents. what value is generated by the above problem? 

 

 

 

 
 
 
 
 

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R Ravindra Pindel
No. of tents = 1500  radius = 2.8 m  height of cylindrical part = H = 3.5 m height of conical part = h = 2.1 m  now , slant height of conical part = l =  surface area of tent = CSA of conical part + CSA of cylindrical part  The surface area of tent = 92.4m2 The surface area of 1500 tents = 1500 * 92.4m2  = 138600 m2 Cost of 1m2  canvas = Rs 120  costs of 138600 m2 canvas = 120 * 138600  costa...
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# School

Find all the zeroes of  2x^4 - 13x^3 + 19x^2 + 7x - 3, if you know that two of its zeroes are 2+\sqrt{3}  and 2-\sqrt{3} .

 

 

 

 
 
 
 
 

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R Ravindra Pindel
Given that   Two zeroes are    and  . The factor of the given polynomial : Now divide the polynomial with their factor  Now factor the above equation : The zeroes are   ,   and .
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# School

 In the circuit shown, find C if the effective capacitance of the whole circuit is to be 0.5 \mu F . All values in the circuit are in \mu F. 

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S safeer
7+3C =14C 11C =7
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# School

A man donates 10 aluminum buckets to an orphanage. A bucket made of aluminum is of height 20 cm and has its upper

and lowest ends of radius 36 cm and 21 cm respectively. Find the cost of preparing 10 buckets if the cost of aluminum sheet is    

 42 per 100 cm2. Write your comments on the act of the man.

 

 
 
 
 
 

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S safeer
Bucket in the shape of frustum  Height = h = 20 cm  Radius = R = 36 cm   radius = r = 21 cm  Area covered with aluminum  sheet for 10 buckets = CSA of a frustum of cone + area of the bottom  therefore the TSA of 10 buckets are =  cost of aluminum  sheet for   is  The total cost of the aluminium sheet is rupees 24621
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# School

A bucket is in the form of a frustum of a cone whose height is 42 cm and the radii of its circular ends are 30 cm and 10 cm. Find the amount of milk (in litres) which this bucket can hold. If the milkman sells the milk at the rate of Rs 40 per litre, what amount he will get from the sale?

If the milkman sells half the milk at less rate to the economically weaker section of society, what value he exhibits by doing this?

 

 
 
 
 
 

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S safeer
Given :                                                                                     If the milkman sells half the milk at less rate to the economically weaker section of the society, he shows the values of helpful, compassion, kindness and good human being.
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# School

Under the action of force a 2 kg body moves such that its position x as a function of time t is given by x=\frac{t^3}{3}.The work done by the force in the first five seconds is

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S Shubham Krishnan
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# School

Prove that \\ \frac{\cos\theta}{1-\tan\theta}+\frac{\sin\theta}{1-\cot\theta}=\cos\theta+\sin\theta

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S safeer
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# School

Define current. What is its unit

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S safeer
The rate of flow of charge is current. Its SI unit is Ampere.  Current I =dq/dt  
# School

What's the distance between the points (0,8) and (0,-4)

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S safeer
X coordinate of both the points is zero. So the distance in Y-axis is 10 cm
# School

A container opened at the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm respectively. Find the cost of milk which can completely fill the container, at the rate of Rs 50 per litre. Also find the cost of metal sheet used to make the container, if it costs Rs10 per100 cm2. (Take \pi= 3·14)

 

 

 
 
 
 
 

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S safeer
Given height of frustrum, h= 16 cm upper end radius, R = 20 cm Lower end radius, r = 8 cm slant height frustrum = l Volume of milk = volume of the frustum Vol of milk Cost of 1 litre milk = 50 Rs Cost of 10.4 litre milk = Rs                                    Rupees Surface are of frustum                                                                          ...
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