rebika

Most popular questions and responses by rebika
1. physics

A 76 kg rock is rolling horizontally at the top of a vertical cliff that is 20m above the surface of lake.the top of the vertical face of the dam is located 100m from the foot of the cliff with the top of the dam level plain is 25m below the top of the

2. math

5 years from now a boy's age will be 2 time the square of what it was 5 years ago.how old is he now? a)15/2 years c)7 years b)3 years d) 8 years

3. chemistry

what volume of 0.85M oxalic acid (C2H2O4) solution would be required to the following equation ( atomic mass C=12 ,O=16 and Na=23) A. 10.8mL C.10.8L B.108 L D.108 mL

4. chemistry

why oxides of carbon ,carbonates ,hydrogen carbonates ,cyanides and cyanates are not organic compound?

5. biology

if an ox extracts only 50% of potential energy in grass and out of this if the ox used 40% to build up its body ,then the overall efficiency of grass to become part of ox would be: A)10% C)20% B)15% D)30%

6. math

if the line through A(k,p) and B(3,2) and the line through C(k-1,p+2) and D(-4,3) meet at(1,-2).find the values of k and p.

7. math

the areas of the three non parallel face of right rectangular prism are in the ratio 15:9:4 and its volume is 300.determine the lengths of its sides.

8. math

a water tank is supplied by a pipe of diameter50cm the pipe is replaced by k pipe each of which has diameter 10cm.find k.

1. Physics

let vy=is vertical componet then t' time of flight x=ut' y=vyt'-gt'^2/2 then eliminate the two equation H= y +gt^2/2 and to find vy vy=yu/x +gx/2u D+x=ut substitute the tow equation, D=usqrt(2H)/g -x

posted on October 7, 2017
2. Math ( Polynomial )

x^3+2x^2-5ax -7/x+1 R1= 5a-6 x^3+ax^2-12x+6/x-2 R2=4a-10 2R1+R2=6 2(5a-6)+4a-10=6 a=2 use remaider theorem .

posted on September 27, 2017
3. physics

at room temperature=20°c v=f*wavelength v=342.2m/s wave length=10m f=342.2m/s/10m 34.22Hz

posted on August 23, 2017
4. MATHS

113040m cube

posted on August 9, 2017
5. MATHS

volume 3.14*0.03*120 11.304m cube

posted on August 9, 2017
6. math

1.08m

posted on August 9, 2017