2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } - Education (6)

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2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } - Education (6) - Nairaland

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 2:46pm On Jan 27, 2016

Oxytocin:
Hmmm..... Nice thread, keep it guyz! Kudos thankyouJesus
2.12.5cm
3.1.35Joules
I don't have a pen to solve no1
BTW.. Youngs modulus does not have a unit as you've written up there^^

On the other hand, am creating a WhatsApp group, for chemistry, physics, biology and maths.. Anyone interested should drop his/her number .

my name is musty my no is 08023240057
embarassed

Oxytocin:
Hmmm..... Nice thread, keep it guyz! Kudos thankyouJesus
2.12.5cm
3.1.35Joules
I don't have a pen to solve no1
BTW.. Youngs modulus does not have a unit as you've written up there^^

On the other hand, am creating a WhatsApp group, for chemistry, physics, biology and maths.. Anyone interested should drop his/her number .

my name is musty my no is 08023240057

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 11:16pm On Jan 29, 2016

[size=15pt]Mr schoolsupdate, why are you so intransigent? Didn't you see that this is a physics thread? Didn't you read the rule written in red ink, which clearly stated that you shouldn't post adverts here? Please stop derailing this thread. You guys posting long adverts here should stop it!!! [/size]

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by mathefaro(m): 8:28am On Jan 30, 2016

1. Gas prepared by the rxn btwn methanoic acid and conc H2SO4 is?
A. SO2
B. CO
C. CO2
D. H2S

2. A heating coil rated 1000W is used to boil off completely 2kg of boiling water. The time required to boil off the water is
A. 1.15*10⁴s
B. 1.15*10³s
C. 4.6*10⁴s
D. 4.6*10³s
(Specific Latent heat of vaporization of water= 2.3*10^6 Jkg-¹)

3. If the pressure of the vapour on top of an enclosed liquid is equal to the atmospheric pressure,what will be the temperature of the liquid enclosed?
A. Room temperature
B. Boiling point
C. Freezing point
D. Standard temperature

4. An object of mass 80kg is pulled on q horizontal rough ground by a force of 500N. Find the coefficient of static friction. A. 0.8
B. 0.4
C. 1.0
D. 0.6
(g=10ms-²)

5. A car accelerates uniformly from rest at 4ms-². How far will it travel in the fifth complete second? A. 100m
B. 50m
C. 32m
D. 18m

6. If a light wave has a wavelength of 500mm in air,what is the frequency of the wave?
A. 3.0*10¹⁴Hz
B. 6.0*10^8 Hz
C. 6.0*10^5Hz
D. 2.5*10¹⁴Hz
(c= 3*10^8ms-¹)

7. The ability of the human eye to focus objects on the retina is referred to as the power of
A. Interference
B. Diffraction
C. Accommodation
D. Superposition

8. Thermionic emission is the process whereby
A. Beta rays are produced
B. Holes are produced
C. X-rays are produced
D. Electrons leave a hot element

9. If the refractive index of crown glass is 1.51,its critical angle is
A. 48.6°
B. 22.5°
C. 41.5°
D. 45.0°

10. A bullet fired vertically upward from a gun held 2.0m above the ground reaches its maximum height in 4s. Calculate its initial velocity
A. 10ms-¹
B. 8ms-¹
C. 40ms-¹
D. 20ms-¹
(g=10ms-²)

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 3:52pm On Jan 30, 2016

mathefaro:

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 3:53pm On Jan 30, 2016

@mathefaro

1 Like

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by mathefaro(m): 4:07pm On Jan 30, 2016

ShyNeptune:

This is lovely. Which app did you use?

1 Like

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 4:12pm On Jan 30, 2016

Thanks @mathefaro..... it's a feature on my phone.
It's called "s Note" and it's actually this neat because my phone has a stylus.

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 8:47pm On Jan 30, 2016

more questions please...... loving this so much.

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by iceberryose(m): 4:09pm On Feb 09, 2016

HeY people. I've really missed a lot. But am back and ready to use this two weeks to prepare well. cc geofavor thankyoujesus

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Brownhypo: 4:21pm On Feb 09, 2016

Oxytocin:
Hmmm..... Nice thread, keep it guyz! Kudos thankyouJesus
2.12.5cm
3.1.35Joules
I don't have a pen to solve no1
BTW.. Youngs modulus does not have a unit as you've written up there^^

On the other hand, am creating a WhatsApp group, for chemistry, physics, biology and maths.. Anyone interested should drop his/her number .

08167204407

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 6:43pm On Feb 09, 2016

iceberryose:
HeY people. I've really missed a lot. But am back and ready to use this two weeks to prepare well. cc ge.ofavor thankyoujesus

welcome back, bro. Unfortunately, lectures have stopped here. embarassed

. I myself still have a lot to cover. Don't hesitate to post questions or any other thing.

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 4:59pm On Feb 10, 2016

A rightward force is applied to a 6-kg object to move it across a rough surface at constant velocity. The object encounters 15 N of frictional force. Pls find F_app ( applied force).

Thankyoujesus, shyneptune, mathefaro

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by mathefaro(m): 5:14pm On Feb 10, 2016

Geofavor:
A rightward force is applied to a 6-kg object to move it across a rough surface at constant velocity. The object encounters 15 N of frictional force. Pls find F_app ( applied force).

Thankyoujesus, shyneptune, mathefaro

I think it's 15N since there's no acceleration

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 5:16pm On Feb 10, 2016

Geofavor:
A rightward force is applied to a 6-kg object to move it across a rough surface at constant velocity. The object encounters 15 N of frictional force. Pls find F_app ( applied force).

Thankyoujesus, shyneptune, mathefaro

Technical question grin

Well, from the little I know;
At constant velocity, acceleration = 0m/s2
And and if the mass was initially at rest and after a force was applied the acceleration was still zero that means that the body did not move at all.
Hence the applied force equals the frictional force.

Hence applied force = 15N angry

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 5:18pm On Feb 10, 2016

Mathefaro thinks same too grin

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 5:22pm On Feb 10, 2016

mathefaro:
I think it's 15N since there's no acceleration

modified*
this will mean that the object remained stationary. But the question stated that a force was applied to move the object across the surface with a constant velocity.

actually. they asked for the applied force and the net force.

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by mathefaro(m): 5:26pm On Feb 10, 2016

Geofavor:

this will mean that the object remained stationary. But the question stated that the objected had a constant velocity.

Fnet = Fapp - Ffr and since acceleration is zero, Fnet = 0

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 5:29pm On Feb 10, 2016

mathefaro:
Fnet = Fapp - Ffr and since acceleration is zero, Fnet = 0

oh. This is true. grin

thanks.

Thanks shyneptune

1 Like

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 6:06pm On Feb 10, 2016

Lee Mealone is sledding with his friends when he becomes disgruntled by one of his friend's comments. He exerts a rightward force of 9.13 N on his 4.68-kg sled to accelerate it across the snow.
If the acceleration of the sled is 0.815 m/s/s, then what is the coefficient of friction between the sled and the snow?

Mathefaro, shyneptune, thankyoujesus.

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 7:27pm On Feb 10, 2016

Geofavor:
Lee Mealone is sledding with his friends when he becomes disgruntled by one of his friend's comments. He exerts a rightward force of 9.13 N on his 4.68-kg sled to accelerate it across the snow.
If the acceleration of the sled is 0.815 m/s/s, then what is the coefficient of friction between the sled and the snow?

Mathefaro, shyneptune, thankyoujesus.

f=uN
where f is force,
N is reaction=f=ma

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 7:34pm On Feb 10, 2016

Geofavor:
Lee Mealone is sledding with his friends when he becomes disgruntled by one of his friend's comments. He exerts a rightward force of 9.13 N on his 4.68-kg sled to accelerate it across the snow.
If the acceleration of the sled is 0.815 m/s/s, then what is the coefficient of friction between the sled and the snow?

Mathefaro, shyneptune, thankyoujesus.

Lol. @ Lee mealone grin

W = mg
W=4.68×9.8
=45.86 N

F net = Ma
=4.68×0.815
=3.81 N

Frictional force = net force - applied force
= 3.81N – 9.13N
= 5.32N

μ = Frictional force /Reaction
= 5.32/45.86
= 0.116 angry

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by mathefaro(m): 8:35pm On Feb 10, 2016

ShyNeptune:

Lol. @ Lee mealone

W = mg
W=4.68×9.8
=45.86 N

F net = Ma
=4.68×0.815
=3.81 N

Frictional force = net force - applied force
= 3.81N – 9.13N
= 5.32N

μ = Frictional force /Reaction
= 5.32/45.86
= 0.116

It's actually applied force - net force in this case

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 10:06pm On Feb 10, 2016

ShyNeptune:
Lol. @ Lee mealone

W = mg W=4.68×9.8 =45.86 N
F net = Ma =4.68×0.815 =3.81 N
Frictional force = net force - applied force = 3.81N – 9.13N = 5.32N
μ = Frictional force /Reaction = 5.32/45.86 = 0.116

nice one. Check the emboldned

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Oxytocin(m): 12:36am On Feb 11, 2016

Hmmm...
Still following grin

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 6:51am On Feb 11, 2016

Geofavor:

nice one. Check the emboldned

Yeah.

It's suppose to be applied force - net force.
Because F net = F app- F fri
Thanks mathefaro wink

1 Like

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 6:56am On Feb 11, 2016

Oxytocin:
Hmmm...
Still following

Don't you sleep? cheesy

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 6:58am On Feb 11, 2016

mathefaro:
It's actually applied force - net force in this case

Yeah... Thanks. wink

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Oxytocin(m): 9:25am On Feb 11, 2016

ShyNeptune:

Don't you sleep?

Lol... I do sleep chat cheesy

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Nobody: 3:27pm On Feb 11, 2016

Oxytocin:

Lol... I do sleep chat

Lwkmd.

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