buzyguy: The type of dehiscent fruit in which each separat divided part contains a seed is,a.schizocarp b.follicle c.capsules d. Legumes

buzyguy: The type of dehiscent fruit in which each separat divided part contains a seed is,a.schizocarp b.follicle c.capsules d. Legumes

mayorall:

Both legumes and capsules separate divided part contains seeds...the only dfrnc z dat d earlier z made frm dfrnt carpels.....

buzyguy: Chck da questn vry well,ansa z there

mayorall:

Yeah..buh there are two

mayorall: Amoeba belong to which of the following phylum?.

A. Mastigophora
B. Sarcomastigophora
C. Sarcodina
D. Ciliophora

mayorall: Which of the following will undergo substitution reaction?

A. C4H8
B. C7H16
C. C2H4
D. C8H16

olatosina: love u guys. Take dis.
which of dis do not react with N02
a. Sulphur nd candle
b. Ammonia nd lead
c. Copper nd benzene
d. Tetrachloromethane nd nephtaline

mayorall: The commercial production of Tetraoxosulphate (vi) acid is know as
a. vulcanization
b. contact process
c. Herber process
d. Isomerization

edreesabiodun: Which of the following is insoluble in water a) ethanol b) HCl c) ether d) NH3. (2) which of the ffg will form a white precipitate with AgNO3 a) Butane b) ethene c) ethyne d) benzene 3)ethene will change the colour of KMnO4 from purple to what in an alkaline medium a)brown, b)yellow c)green d) reddish brown

Michaellegend:
The first stage of treatment of water for township supply is sedimentation.

buzyguy: Watz da funtn of da mixture of argon-nitrogen in filling lamp filament or bulb?a.prevents reductn by air b.prevents oxidatn by co2 c.prevents blackening d.prevents rustn of da filament

buzyguy: Watz da funtn of calcium fluoride in the xtractn of ca?a.to prevent damag of electrdes b.to raise da meltn point of da electroly c.for economic purpose d.to reduce the rate of da reactn

buzyguy: Sodium metal is easier to cut with a knife than a calcium metal bcus,a.its found in group 1 b.its nt totally considered as metal c.its soft d. its crystals r planar in shape

mayorall: Which of the following will undergo substitution reaction?

A. C4H8
B. C7H16
C. C2H4
D. C8H16

olatosina: love u guys. Take dis.
which of dis do not react with N02
a. Sulphur nd candle
b. Ammonia nd lead
c. Copper nd benzene
d. Tetrachloromethane nd nephtaline

olatosina: which of dis has banana smell
a. CH3COOC5H11
b. CH3COOC8H17
c. CH3COOC3H7
d. CH3COOC6H13

Donsnazzy:

Nemidav: Guy i'v a prob wiv diz question. . . . When taking a penalty kick,a footballer applies a force of 30.0N for a period of 0.05s.ifthe mass of the ball is 0.075kg,cal d speed with which the ball moves off.
A.4.50m/s b.11.25m/s c.20.00m/s d. 45.00 m/s

Nemidav:
i solvd it lyk diz f=30N,T= 0.05S,M= 0.075kg,u=0...a=f/m;a=30/0.075;a=400
then i used s=ut+1/2at^2
s=1/2*400*0.0025
;s=0.5;using speed=distance/time;0.5/0.05=10. . . . And therez no 10 in d options,did i make a mistake?

ANDREW2EIC:

Perhaps u were wrong. I think u unnecessarily prolonged a simple work.
Below is my little explanation to the question:

When a force f(N) is applied on a body of mass m(kg) for a given period of time t(s), the body gains momentum i.e, the massive body moves forward with a certain velocity. The gain in momentum is as a result of force which acts with time. With the already established fact, i can safely say that the gain in momentum is also as a result of impulse on the body. I believe u still remember that impulse is mathematically expressed as: force x time, ft. From law of conservation of energy, energy exhausted for exerted force on the body for a period of time = energy gained by the body to give it momentum.

Hence, impulse = momentum gained, i.e, ft = mv (where m=mass of the body, v = velocity gained. Of course, f is force and t is time taken)

Relating my explanation with the problem at hand, we have:

force exerted by the footballer = 30N, time taken = 0.05s, mass of ball = 0.075kg, velocity= ?.
Substituting:
30x0.05 = 0.075xV, 0.075V = 1.5 (divide both sides by 0.075)
0.075V/0.075 = 1.5/0.075
V = 20m/s.
Therefore, the velocity gained by the ball is 20m/s.

N:B, i only elaborated this much for u to understand what really happened, not that the question is really that difficult.

Hope that helps!