Physics: Post your doubts here!

[ijlalm]

Q: A child (mass m) sits on a car seat which is accelerating horizontally at 0.50g (where g is the acceleration of free fall).
What is the magnitude of the total force exerted by the car seat on the child?

A. 0.50mg B. 1.0mg C.1.1mg D1.5mg

 

[ZaqZainab]

Q: A child (mass m) sits on a car seat which is accelerating horizontally at 0.50g (where g is the acceleration of free fall).
What is the magnitude of the total force exerted by the car seat on the child?

A. 0.50mg B. 1.0mg C.1.1mg D1.5mg

is the answer C?
if so i will explain how i got it

 

[ijlalm]

yes its C surely
i also figured out the solution
thnx anyway..

 

[The Godfather]

is the answer C?
if so i will explain how i got it

Tell me how ?

 

[ijlalm]

If the seat is accelerating horizontally then there is a force of o.5 mg acting in the horizontal direction on the child.

There is also a force of 1 mg acting upwards on the child to prevent them falling under gravity

Use pythagoras to calculate the hypotenuse and hence the magnitude of the resultant force.

Even without doing the calculations you must realize that it has to be greater than 1mg but can't be equal to the sum of the two (1.5mg) unless the forces were acting in the same direction.

So there is only one answer in this range.

 

[The Godfather]

If the seat is accelerating horizontally then there is a force of o.5 mg acting in the horizontal direction on the child.

There is also a force of 1 mg acting upwards on the child to prevent them falling under gravity

Use pythagoras to calculate the hypotenuse and hence the magnitude of the resultant force.

Even without doing the calculations you must realize that it has to be greater than 1mg but can't be equal to the sum of the two (1.5mg) unless the forces were acting in the same direction.

So there is only one answer in this range.

ty

 

[leadingguy]

Can Anyone tell me the physics(9702) syllabus topics of electricity portion of As-level??
I have seen the 2014 syllabus. on cie.org still....
If anyone can specify the main topics of the syllabus electricity portion for As level????
like Milikan's oil drop experiment, kirchhof's rules. ect

 

[ZaqZainab]

Can Anyone tell me the physics(9702) syllabus topics of electricity portion of As-level??
I have seen the 2014 syllabus. on cie.org still....
If anyone can specify the main topics of the syllabus electricity portion for As level????
like Milikan's oil drop experiment, kirchhof's rules. ect

Electric Filed
Attraction and repulsion
investigating electric fields
Electric Field strength
Force on a charge"

Electric current,potential difference and resistance
Circuit symbols and diagrams
Electric current
The meaning of voltage
electrical resistance
Electrical power

Kirchhoff's law first law
second law
applying
resistor combination
Ammeters and voltmeters

Resistance and Resistivity The I-V characteristics for a metallic conductor
Ohm's law
Resistance and temperature
Resistivity

Practical circuits
Internal resistance
Potential divider
Potentiometer circuits

Source: Book recommended by CIE(Physics coursebook)

 

[leadingguy]

Electric Filed
Attraction and repulsion
investigating electric fields
Electric Field strength
Force on a charge"

Electric current,potential difference and resistance
Circuit symbols and diagrams
Electric current
The meaning of voltage
electrical resistance
Electrical power

Kirchhoff's law first law
second law
applying
resistor combination
Ammeters and voltmeters

Resistance and Resistivity The I-V characteristics for a metallic conductor
Ohm's law
Resistance and temperature
Resistivity

Practical circuits
Internal resistance
Potential divider
Potentiometer circuits

Source: Book recommended by CIE(Physics coursebook)

Thanks loads + the E = -V relation is present in As ?? or part of A2??
And thank you very much.

 

[ZaqZainab]

Thanks loads + the E = -V relation is present in As ?? or part of A2??
And thank you very much.

Nope it actually I-V graph
its even mentioned in the syllabus
sketch and explain the I-V characteristics of a metallic conductor at
constant temperature, a semiconductor diode and a filament lamp

 

[Thought blocker]

Can Anyone tell me the physics(9702) syllabus topics of electricity portion of As-level??
I have seen the 2014 syllabus. on cie.org still....
If anyone can specify the main topics of the syllabus electricity portion for As level????
like Milikan's oil drop experiment, kirchhof's rules. ect

Let me give you notes to prepare from.. If you need more, tell me..
I have attached questions too..
I got this awesome notes from this site It helped me alot, hope it help you too Tc...

 

[Thought blocker]

Nope it actually I-V graph
its even mentioned in the syllabus
sketch and explain the I-V characteristics of a metallic conductor at
constant temperature, a semiconductor diode and a filament lamp

As level gurl ?

 

[ZaqZainab]

As level gurl ?

Yup its on page 26 (i) and its not bold so yeah AS level and its in part of the coursebook where there is AS

 

[Thought blocker]

Yup its on page 26 (i) and its not bold so yeah AS level and its in part of the coursebook where there is AS

hahaha I mean Are u AS level girl ?

 

[ZaqZainab]

hahaha I mean Are u AS level girl ?

Yup ^_^ are you a AS level boy

 

[Thought blocker]

Yup ^_^ are you a AS level boy

Yeah, I am. Master in physics. RIP--> Chem

 

[ZaqZainab]

Yeah, I am. Master in physics. RIP--> Chem

RIP is all the subs XD

 

[Thought blocker]

RIP is all the subs XD

Ask me phy or eng, Varient 2 I will surely help to my best.. No need to thank *Telling in advance*

 

[ZaqZainab]

Ask me phy or eng, Varient 2 I will surely help to my best.. No need to thank *Telling in advance*

I don't take english

 

[Thought blocker]

I don't take english

Okay.. *thumbsup*