rebika
Most popular questions and responses by rebika
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
asked on October 7, 2017 
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
asked on August 21, 2017 
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
asked on September 21, 2017 
chemistry
why oxides of carbon ,carbonates ,hydrogen carbonates ,cyanides and cyanates are not organic compound?
asked on September 25, 2017 
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%
asked on August 22, 2017 
math
if the line through A(k,p) and B(3,2) and the line through C(k1,p+2) and D(4,3) meet at(1,2).find the values of k and p.
asked on August 19, 2017 
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.
asked on August 9, 2017 
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.
asked on August 9, 2017

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 
Math ( Polynomial )
x^3+2x^25ax 7/x+1 R1= 5a6 x^3+ax^212x+6/x2 R2=4a10 2R1+R2=6 2(5a6)+4a10=6 a=2 use remaider theorem .
posted on September 27, 2017 
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 
MATHS
113040m cube
posted on August 9, 2017 
MATHS
volume 3.14*0.03*120 11.304m cube
posted on August 9, 2017 
math
1.08m
posted on August 9, 2017