₦airaland Forum

ANDREW2EIC: Yea, it is. I learnt that they admit 2nd choice candidates.

ANDREW2EIC: Our good Lord will grant you your heart desire this year. Am going for electrical electronics engineering, futo is my 1st choice while ui is my 2nd. Nice to have u around here.

Simplefemo: Newton 2nd law of motion, F=m(v-u)/t,
30=0.075*u/0.05
=20m/s (c)

ANDREW2EIC: Honestly, u are such a great guy. Very flexible and willing to learn. These are the qualities that are lacking among us the students, but am really challanged. If you don't mind, which course are u aspiring for and ur preferred institutions?

t.boy007:
wao @andrew,i've gained from that explanation of yours...
I think it can also be solved this way,
from the law of conservation of energy { F=Mv/t}
since f=30N,M=0.075kg,t=0.05
then make v the subject of the formula and solve.the final answer will be 20 N/s

ANDREW2EIC: I woud rather say that u made mistake, but didn't mess up. Come on! Nobody is perfect, we make mistakes everybody. Just keep the good work up.

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!

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

buzyguy: Which of da following z likely to have the net electronegativity of approxim. 1.0 (a)co2 (b)HCL (c)Nacl (d)NH4cl

sagaciousblog: pls can any1 confirm d cutoff mark for med & surgery? and secondly, do indegenes av an upper hand at ben?

sbioks1: Islam can not be like yeye religion of urs when ever almighty allah give pple his sign we always say allahu akbar but this pple of other religion always make rubbish comment against do u pple think islam is like ur fake religion that preach wealth salvation that pple will never imagine they produce gay bible last year to sooth their gay brethren in christ yeye mumu pple

deols: so u do believe d sign is dr.

now we are getting somewhere.

Kunlexic: The organ in man that perform similar function as the contractile vacuole of Amoeba is a.liver b.kidney c.lung d.skin e.bladder

mayorall: Trying solving with this formula
M = MmIT/zf

wie
M is mass
Mm is molar mass
I is current
T is time
z is the charge on the ion
f is the 96500

mayorall: The answers are correct but its not mass number its molar mass H2SO4 and CuO are compound....

Please do you understand how he arrived at the answers...if No...we can use a formular method.

mayorall: If a solutn contains 4.9g of H2SO4, calculate d amount of cuo that will react with it

a.4.0g
b.8.0g
c.0.81g
d.40g

mayorall: What volume of gas is involved at s.t.p if 2g of caco3 is added to a solution of HCl

a.224cm3
b.112cm3
c.240cm3
d.448cm3

born2fuck: Let everyone go back to his/her respective region, I spent my entirely life within the west zone, Ekiti,Ibadan,Lagos,Ogun and Osun.I have never pass my boundary, I have never been to either Hausa or Ibo land. I do not see why an Ibo in west zone raise finger that feed him. That is like point finger to the God that created you. Their days are number...FASHOLA is working

born2fuck: Let everyone go back to his/her respective region, I spent my entirely life within the west zone, Ekiti,Ibadan,Lagos,Ogun and Osun.I have never pass my boundary, I have never been to either Hausa or Ibo land. I do not see why an Ibo in west zone raise finger that feed him. That is like point finger to the God that created you. Their days are number...FASHOLA is working

Wadeoye: See their flat heads. Bakassi boys in Lagos - stupid lazy villagers. Energetic guys that should be farming in their south east villages to feed the people working in Lagos.

Send them to kirikiri with hard labour. The work they were running away from, they will do it in kirikiri.

I have told the okoro heads on this forum that we will close that market very soon. Dirty flat head creatures messing around in Lagos.

kalunomics: i have been shaking my head since morning for that post.
u said it all
The problem that we did not solve with the Aburi Accord still hunts us and I see as an observer that democracy which we are supposedly pursuing and that we are just paying lip service to democracy - Lt. Col. Gabriel Anthony Nyiam
www.vanguardngr.com/2013/02/nigeria-is-a-lie-and-we-believe-it-nyiam/

megawax8: dats kul,u do rememba me......but i aint sure if i wuld.....wat d name??

donedy: SOLUTIONS

From equations of motion: S = V_it + 1/2*a*t² ----- Eq.1

a = -9.81 m/s {gravitational acceleration}
V_i = Given {Initial velocity}
t = 30 s { total elapse time)
S = ? { Change in Distance covered within the given time)

---
^
|
| H
|
|
|
|
------------------------ Ground

a) From Eq.1, V_i = 0 since the balloon was at rest when the bomb was dropped. So,

S = 0 *(30 s) + 1/2 *(-9.81 m/s)*(30 s)² = - 4414.5 m

H = -S

Thus height, H = 4414.5 m

b) From Eq.1, V_i = 100 cm/s = 1 m/s since the balloon was ascending at that speed.

S = (1 m/s)*(30 s) + 1/2 *(-9.81 m/s)*(30 s)² = -4384.5 m

H = -S

Thus height, H = 4384.5 m