Physics walon?

[Rutzaba]

Whats the difference between heat capacity and specific heat?
Further if two bobs of masses 20g and 100g respectively are given to you. Which bob has higher value of specific heat?

 

[Ayyan :D]

Heat Capacity is the amount of heat energy (In Joules J) required to raise the temperature of an object by 1 degree Celsius, regardless of the mass of that object.
For example, if 500 J of Heat Energy is supplied to an Object X, to raise its temperature by 10 Degrees.
What was the Heat needed to raise the temperature by ONE DEGREE? That is the Heat Capacity.
So to find Heat Capacity, you divide the HEAT ENERGY SUPPLIED by RISE IN TEMPERATURE.

So, C = Q/t [Q=Heat Energy, t=change in temperature ]
C= 500/10 = 50 J/degree celsius.

So, the HEAT CAPACITY of Object X is 50 J. (The amount of heat needed to raise its temperature by One Degree)

But, Heat Capacity of an object depends upon mass.
The Greater the mass of an object, the greater the heat energy needed to raise its temperature by One Degree, and thus the greater its Heat Capacity (C).
1000kg of water has a greater Heat Capacity than 100kg of Water.

Coming to Specific Heat Capacity.
Specific Heat Capacity is the amount of Heat Energy required by ''1kg'' of an object to raise its temperature by One Degree Celsius.
This is also similar to HEAT CAPACITY, but in this, the heat energy is specified to 1kg of the substance.

So, if you divide HEAT CAPACITY of object, by its mass, you will get the amount of heat needed for 1kg of it. That's the specific heat capacity of that object.

And the 20g Bob will have higher specific heat capacity, as the lesser the mass, the greater the specific heat capacity.

Specific heat capacity is inversely proportional to mass of the object.

 

[Rutzaba]

Heat Capacity is the amount of heat energy (In Joules J) required to raise the temperature of an object by 1 degree Celsius, regardless of the mass of that object.
For example, if 500 J of Heat Energy is supplied to an Object X, to raise its temperature by 10 Degrees.
What was the Heat needed to raise the temperature by ONE DEGREE? That is the Heat Capacity.
So to find Heat Capacity, you divide the HEAT ENERGY SUPPLIED by RISE IN TEMPERATURE.

So, C = Q/t [Q=Heat Energy, t=change in temperature ]
C= 500/10 = 50 J/degree celsius.

So, the HEAT CAPACITY of Object X is 50 J. (The amount of heat needed to raise its temperature by One Degree)

But, Heat Capacity of an object depends upon mass.
The Greater the mass of an object, the greater the heat energy needed to raise its temperature by One Degree, and thus the greater its Heat Capacity (C).
1000kg of water has a greater Heat Capacity than 100kg of Water.

Coming to Specific Heat Capacity.
Specific Heat Capacity is the amount of Heat Energy required by ''1kg'' of an object to raise its temperature by One Degree Celsius.
This is also similar to HEAT CAPACITY, but in this, the heat energy is specified to 1kg of the substance.

So, if you divide HEAT CAPACITY of object, by its mass, you will get the amount of heat needed for 1kg of it. That's the specific heat capacity of that object.

And the 20g Bob will have higher specific heat capacity, as the lesser the mass, the greater the specific heat capacity.

Specific heat capacity is inversely proportional to mass of the object.

yes that wat i said but the ans says that heat capacity doesnt depend on mass

 

[Ayyan :D]

yes that wat i said but the ans says that heat capacity doesnt depend on mass

What's the question?

 

[Rutzaba]

What's the question?

i told u
Further if two bobs of masses 20g and 100g respectively are given to you. Which bob has higher value of specific heat

 

[Ayyan :D]

i told u
Further if two bobs of masses 20g and 100g respectively are given to you. Which bob has higher value of specific heat

Oh. The question did not mention that the two bob's were of the same material, and all that. I'm sorry.
Well, if the two bobs are of the same material, then they both will have the same specific heat capacity.
Like, for example:

Water has a specific heat capacity of 4200 J/Kg degree Celsius.
No matter what mass of water is given, it will have the same specific heat capacity.
As specific heat capacity is always for unit mass of the substance.

So even a 20 g Bob, will have the same specific heat capacity as 100 g one, because when we convert then to ''Heat energy needed to raise temperature of Unit Mass''(1g or 1kg) of the substance, the amount will be same.

SPECIFIC HEAT CAPACITY OF TWO OBJECTS OF THE SAME MATERIAL IS THE SAME, GIVEN THEY ARE IN THE SAME STATE AT ROOM TEMPERATURE.

 

[Rutzaba]

Oh. The question did not mention that the two bob's were of the same material, and all that. I'm sorry.
Well, if the two bobs are of the same material, then they both will have the same specific heat capacity.
Like, for example:

Water has a specific heat capacity of 4200 J/Kg degree Celsius.
No matter what mass of water is given, it will have the same specific heat capacity.
As specific heat capacity is always for unit mass of the substance.

So even a 20 g Bob, will have the same specific heat capacity as 100 g one, because when we convert then to ''Heat energy needed to raise temperature of Unit Mass''(1g or 1kg) of the substance, the amount will be same.

SPECIFIC HEAT CAPACITY OF TWO OBJECTS OF THE SAME MATERIAL IS THE SAME, GIVEN THEY ARE IN THE SAME STATE AT ROOM TEMPERATURE.

but u said mass matters

 

[Ayyan :D]

but u said mass matters

Heat Capacity and SPECIFIC Heat Capacity are two different things.
Heat Capacity is simply heat energy needed for One Degree temperature rise. But Specific Heat Capacity also includes mass as a factor, mass is divided to get the heat required for the one degree increase in UNIT MASS of object.

The two bobs will NOT have the same HEAT CAPACITY. HEAT CAPACITY depends on mass, as it is simply ''Energy supplied divided by rise in temperature''.. but SPECIFIC heat capacity is Specified to UNIT MASS (Either 1 gram or 1 kilogram) so, Specific Heat Capacity does not depend on mass.. given the two objects are of the same material.
The Specific Heat Capacities of same type of material objects are fixed.
HEAT CAPACITY and SPECIFIC HEAT CAPACITY are separate.

To sum this all up:

- Heat Capacity depends on mass. (100 g of water will have less Heat Capacity then 1000 g of water, as less heat energy will be needed to raise its temperature by 1 degree Celsius)

- Specific Heat Capacity doesn't depend on mass, if the two objects are of the same material. (100 g of water and 1000 g of water will have the same Specific heat capacity, as when the Heat Capacity is divided by Mass, it will automatically be converted into Unit mass)

As in the question, they asked if the SPECIFIC HEAT CAPACITY of the 20g bob will be the same as 100g one.
YES, it will be. As Specific heat capacity is same, for all objects made of the same material.

There is a specific heat capacity table also. That gives the Specific heat capacities of common objects, you can find it in a book or something.
These physicists, they calculated the heat required for one degree temperature increase for ONE KG of common materials and made that table.


EDIT:

Heat Capacity is denoted by a Capital ''C''
Specific Heat Capacity is denoted by a small ''c''

Specific Heat Capacity = Heat Capacity/Mass
This will give us the heat required by unit mass, to raise the temperature by One Degree.

 

[Rutzaba]

Heat Capacity and SPECIFIC Heat Capacity are two different things.
Heat Capacity is simply heat energy needed for One Degree temperature rise. But Specific Heat Capacity also includes mass as a factor, mass is divided to get the heat required for the one degree increase in UNIT MASS of object.

The two bobs will NOT have the same HEAT CAPACITY. HEAT CAPACITY depends on mass, as it is simply ''Energy supplied divided by rise in temperature''.. but SPECIFIC heat capacity is Specified to UNIT MASS (Either 1 gram or 1 kilogram) so, Specific Heat Capacity does not depend on mass.. given the two objects are of the same material.
The Specific Heat Capacities of same type of material objects are fixed.
HEAT CAPACITY and SPECIFIC HEAT CAPACITY are separate.

To sum this all up:

- Heat Capacity depends on mass. (100 g of water will have less Heat Capacity then 1000 g of water, as less heat energy will be needed to raise its temperature by 1 degree Celsius)

- Specific Heat Capacity doesn't depend on mass, if the two objects are of the same material. (100 g of water and 1000 g of water will have the same Specific heat capacity, as when the Heat Capacity is divided by Mass, it will automatically be converted into Unit mass)

As in the question, they asked if the SPECIFIC HEAT CAPACITY of the 20g bob will be the same as 100g one.
YES, it will be. As Specific heat capacity is same, for all objects made of the same material.

There is a specific heat capacity table also. That gives the Specific heat capacities of common objects, you can find it in a book or something.
These physicists, they calculated the heat required for one degree temperature increase for ONE KG of common materials and made that table.

thankyouuuu

 

[Rutzaba]

Now do u know about the practical involving newtons rings?

 

[Rutzaba]

Thisis about wave interference bot constructive and destructive

 

[Ayyan :D]

Now do u know about the practical involving newtons rings?

Sorry. I'm just an O-Level student. Haven't studied that stuff yet, not in the syllabus.

 

[Rutzaba]

Sorry. I'm just an O-Level student. Haven't studied that stuff yet, not in the syllabus.

oh oki thanks

 

[Ayyan :D]

oh oki thanks

You're welcome.
Good Luck, for whatever you are studying for.

 

[Rutzaba]

You're welcome.
Good Luck, for whatever you are studying for.

University .. lab final tommz.. do pray

 

[Ayyan :D]

University .. lab final tommz.. do pray

Sure.