Dellybanky:
A body rolls down a slope from a height of 100m. It's velocity at the loot of the slope is 20m/^| what is the percentage of its potential energy when converted into kinetic energy?

I need answer to the question please

Sofia01:
chemical change

pls y z it a chemical change need info on that

Dellybanky:
A body rolls down a slope from a height of 100m. It's velocity at the loot of the slope is 20m/^| what is the percentage of its potential energy when converted into kinetic energy?

p.e=k.e
mgh=1/2mv^2
mass cancelled out
10*100=1/2*20^2
1000=200
%=200/1000*100
%=0.2*100
=20%

Gracy3535:
pls y z it a chemical change need info on that

d composition of egg will change nah.

esivue007:
d composition of egg will change nah.

abi o just want to be sure. Tanx

Calculate the volume of air required to produce 35g of phosphorus (v) oxide during the combustion of n excess of phosphorus.[O=16,P=31.All gas volumes measured at the same temperature & pressure.Air is about 20% oxygen by volume]

Gracy3535:
pls y z it a chemical change need info on that

chemical change is a change that can't be reversed, and a boiled egg can't turn to a raw egg anymore so it's a chemical change

3. A boy looks at the image of an object in a plane mirror. He observes two images, a main bright one and the other faint. The observe image result from (A). reflection only (B). refraction only (C). diffraction and interference (D). reflection and refraction

Gracy3535:
pls y z it a chemical change need info on that

a chemical change is a change that can't be reversed and a boiled egg can't turn to a raw egg back so it's a chemical change

Ui aspirant be like

Dellybanky:
A body rolls down a slope from a height of 100m. Its velocity at the foot of the slope is 20m/s. What is the percentage of its potential energy when converted into kinetic energy?

height of slope h=100m, velocity of the body v=20m/s, g=10m/s^2...P.E=mgh >>> P.E=m*10*100 >>> P.E=1000m J...K.E=1/2mv^2 >>> K.E=1/2*m*20^2 >>> K.E=1/2*m*400 >>> K.E=200m J....Energy dissipitated when the potential energy is converted to kinetic energy=1000m J - 200m J=800m J....% of P.E when converted to K.E=800m/1000m*100 >>> % of P.E converted=800/1000*100 ( m will cancel out) >>> % P.E=0.8*100=80%...therefore % of P.E when converted to K.E=80%.

overcomer90:
3. A boy looks at the image of an object in a plane mirror. He observes two images, a main bright one and the other faint. The observe image result from (A). reflection only (B). refraction only (C). diffraction and interference (D). reflection and refraction

A

1.A lead bullet of mass 0.05kg is fired with a velocity of 200m8’1 into a lead block of mass 0.95kg.Given that the lead block can move freely, the final kinetic after impart is


A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100ms*1: The recoil speed of the machine gun is (a) 0.5m/s (b) 3.5m/s (c) | m/s .(d) 2mls (e) 4 m/s


The length of a displaced pendulum bob which passes lowest point twice every second, assuming g is 10m/s is

Dellybanky:
1.A lead bullet of mass 0.05kg is fired with a velocity of 200m8’1 into a lead block of mass 0.95kg.Given that the lead block can move freely, the final kinetic after impart is


A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100ms*1: The recoil speed of the machine gun is (a) 0.5m/s (b) 3.5m/s (c) | m/s .(d) 2mls (e) 4 m/s


The length of a displaced pendulum bob which passes lowest point twice every second, assuming g is 10m/s is

answers needed please

pls does ui post utme reqiure current affairs

Dellybanky:
answers needed please

we cant continue solvin without knwin whether we are correct or wrong. The two answers up there which z correct so we also can learn 4rm mistakes

SaintAY:
pls does ui post utme reqiure current affairs

capital NO only ur jamb combo

Dellybanky:
1.A lead bullet of mass 0.05kg is fired with a velocity of 200m8’1 into a lead block of mass 0.95kg.Given that the lead block can move freely, the final kinetic after impart is


A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100ms*1: The recoil speed of the machine gun is (a) 0.5m/s (b) 3.5m/s (c) | m/s .(d) 2mls (e) 4 m/s


The length of a displaced pendulum bob which passes lowest point twice every second, assuming g is 10m/s is

buzy nw ll try later
but our bosses might help sha

Eben331:
A

Y did you minus 4 the. p.e=k.e learning tho

Eben331:
A

Same here because mirrors form images by reflection and not refraction

Gracy3535:
capital NO only ur jamb combo

and ave been wasting my time reaing current affairs

UI 2017 POST UTME-PHYSICS QUESTIONS
***As micro implies 10-6, femto implies what? (a)10-15 (b)10-12 (c)10-21 (d) 10-18

***An inventor makes a clock using a thin brass rod and a heavy mass as a pendulum. What
happens during a very cold weather? (a) The pendulum would shorten and the clock gain time
(b) The pendulum would lengthen and the clock gain time (c) The pendulum would shorten and
clock lose time (d) The pendulum would lengthen and the clock lose time

***A ladder of length 3m weighs 200N and has its centre of gravity 120cm from its bottom. A 50N
weight is attached to its top. Calculate the amount of work required to raise the ladder from a
horizontal position on the ground to a vertical position. (a) 390J (b) 240J (c) 150J (d) 750J

***Complete the following statement: Today, the standard unit of time is defined in terms of (a) the
electromagnetic waves emitted by cesium atoms (b) the motion of the moon around the earth
(c) the average solar day (d) the speed of light

***A force, 10N drags a mass 10kg in a horizontal table with an acceleration of 0.2ms-2
. What is the
coefficient of friction between the moving mass and the table if the acceleration due to gravity is
10ms-2
(a) 0.02 (b) 0.08 (c) 0.80 (d) 0.20

R u sure its frm last yr,if it is pls send more

Rursh:
UI 2017 POST UTME-PHYSICS QUESTIONS
***As micro implies 10-6, femto implies what? (a)10-15 (b)10-12 (c)10-21 (d) 10-18

***An inventor makes a clock using a thin brass rod and a heavy mass as a pendulum. What
happens during a very cold weather? (a) The pendulum would shorten and the clock gain time
(b) The pendulum would lengthen and the clock gain time (c) The pendulum would shorten and
clock lose time (d) The pendulum would lengthen and the clock lose time

***A ladder of length 3m weighs 200N and has its centre of gravity 120cm from its bottom. A 50N
weight is attached to its top. Calculate the amount of work required to raise the ladder from a
horizontal position on the ground to a vertical position. (a) 390J (b) 240J (c) 150J (d) 750J

***Complete the following statement: Today, the standard unit of time is defined in terms of (a) the
electromagnetic waves emitted by cesium atoms (b) the motion of the moon around the earth
(c) the average solar day (d) the speed of light

***A force, 10N drags a mass 10kg in a horizontal table with an acceleration of 0.2ms-2
. What is the
coefficient of friction between the moving mass and the table if the acceleration due to gravity is
10ms-2
(a) 0.02 (b) 0.08 (c) 0.80 (d) 0.20

TeflonBlixx:


1. Arboreal. . They 'live' on trees

2. Hermophrodite. . Monoecious flowers are not capable of self pollination

3. Cryptic colouration

4. Pancreas. .

5. Fatty foods cause obesity. . Magarine and butter

6. Prevents water logging. . Clayey soils are known for their soil water rententivity. . Adding of slake lime, Caco3 or gypsum helps loosen up the texture thereby reducing water logging

7. Occupy different ecological niches

8. Chisel like front teeth. .

9. C

10. Pericycle. . I'm not well versed in supporting tissues in plant...

11. Soil is already present. . From my soil science knowledge, primary succession is mostly slow due to weathering process of parent materials. . Believe me bro, weathering is a slow process..

yov did great but for number 10 the answer is cortex as stele means central part of vascular plant especially containing xylem and phloem so it is cortex in roots and parenchyma in dicot stem

so the answer is cortex

OyedejiIfedayo:

yov did great but for number 10 the answer is cortex as stele means central part of vascular plant especially containing xylem and phloem so it is cortex in roots and parenchyma in dicot stem

so the answer is cortex

The answer is pericycle not cortex. You can make your findings right.

Gracy3535:

Y did you minus 4 the. p.e=k.e
learning tho

Since the question asked us to find the % of P.E converted to K.E, so the amount of potential energy converted to kinetic energy will be 800m J.

Gracy3535:
Calculate the volume of air required to produce 35g of phosphorus (v) oxide during the combustion of n excess of phosphorus.[O=16,P=31.All gas volumes measured at the same temperature & pressure.Air is about 20& oxygen by volume]

I don't understand what you are trying to pass across in the last sentence of the question. Check again.

1 is equal to 50J
2 is 1m/s

Dellybanky:
1.A lead bullet of mass 0.05kg is fired with a velocity of 200m8’1 into a lead block of mass 0.95kg.Given that the lead block can move freely, the final kinetic after impact is

mass of bullet m1=0.05kg, initial velocity of bullet u1=200m/s, mass of block m2=0.95kg, initial velocity of block u2=0 (since a block is stationary)...note that after impact, they will move with a common final velocity v...using law of conservation of momentum: m1u1+m2u2=(m1+m2)v [v1=v2=v]....0.05*200+0.95*0=(0.05+0.95)v....10+0=1*v....10=v...v=10m/s...To find the final kinetic energy after impact: K.E after impact=1/2(m1+m2)v^2=1/2*(0.05+0.95)*10^2=1/2*1*100=50J...therefore final kinetic energy after impact=50J

Dellybanky:

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100ms*1: The recoil speed of the machine gun is (a) 0.5m/s (b) 3.5m/s (c) | m/s .(d) 2mls (e) 4 m/s

mass of gun Mg=5kg, mass of bullet Mb=50g=0.05kg, final velocity of gun Vg=?, final velocity of bullet Vb=100m/s...note that the momentum before firing of the gun is zero (i.e initial momentum of the gun-bullet system is zero)...0=MbVb+MgVg.... MbVb=-MgVg.... 0.05*100=-5*Vg.... 5=-5*Vg....Vg=-5/5=-1m/s...therefore recoil speed of gun=1m/s.

The intensity of light falling on the film in a camera depend on the i. brightness of the object. ii. diameter of the aperture stop. iii. speed of the shutter. Which of the statements is/are correct/

A. i, ii and iii
B. i and ii only
C. i and ii only
D. ii and iii only
E. iii only

Dellybanky:

The length of a displaced pendulum bob which passes lowest point twice every second, assuming g is 10m/s is

length l=?, g=10m/s^2, f=2s^-1 or 2Hz, pie=3.14.... f=1/2pie*_/g/l....2=1/(2*3.14)*_/10/l....2=1/6.28*_/10/l....cross multiply...2*6.28=_/10/l....12.56=_/10/l....spuare both sides.... 12.56^2=10/l....l=10/12.56^2.... l=10/157.7536....l=0.0633m N.B: where _/ means square root. I am not sure whether the answer is correct or not.