Question

Temperature is the same thing as heat.
I just started physics, and I belive that the answer would be false because temperature is a measurment and heat is a.... thing a... temp ok im confused

Answer 1

Oh its a true or false question!

Answer 2

Only the first line is a question the rest is my attempt at answering it!

Answer 3

You are correct. It's false.

Heat is energy. It's what we put into things to raise their temperature, and what we remove to cool them down. The two are related, but not the same.

You may have heard of a "specific heat" or a "heat capacity." These are things that tell us how much heat it takes to change the temperature of an object by 1 degree.

If heat were the same as temperature, we wouldn't need such a factor.

Answer 4

Thank you I have a lot of questions to answer, could you help me with a few more?

Answer 5

I can try

Answer 6

OK, here is the second one:
Force is a form of energy.

I think it is false again......

Answer 7

Wait no true!!! UHHH physics is horrible!!!!!!!!!

Answer 8

Force is not energy.

Once again, they are related, but they are not the same.

Answer 9

Ok can I ask another?

Answer 10

sure

Answer 11

Ok! Thanks,
When touching an object, the sensation of hot and cold is a measure of object's overall temperature? True or False.
I think true because they said overall and that would mean that there only talking about how it basicly feels.....

Answer 12

Well, it's a measure of it's temperature, that's true.

I'd be careful with the word "overall." If they mean throughout the entire object, this isn't technically true. It's a measure of the temperature of the parts you are in contact with. It's only a measure of the temperature throughout the object if the object is in thermal equilibrium throughout it's volume.

For instance, I'm sure you've touched something that is hot in one place, but not in another.

Answer 13

Ok, i see what your saying, so would I pick false?

Answer 14

I would, but it's just because of touchy wording. You may want to get clarification on it from your teacher.

Answer 15

Ok I will on Monday! Im really sorry because Im like asking you a lot of questions but I have some more and was wondering if you could answer one more! PLEASE

Answer 16

sure

Answer 17

Running a ceiling fan in an enclosed room during the summer will slowly raise the room’s temperature (assuming no heat transfer in or out).

I don't know how this one would work i'm lost, with this one.

Answer 18

Well I think true.... because the fan is moving....

Answer 19

Fans don't actually remove heat from a room (at least ceiling fans don't). They just push it around. However, a motor is needed to keep the fan running.

This motor is not 100% efficient. This means that it'll release some energy in the form of heat.

So yes, running a fan in an enclosed room will raise the temperature.

Answer 20

:) yeah! Your really good at this, you see i'm in 7th grade but I have to take advanced courses and sometimes I can get lost!!!!!

Answer 21

If you have time for any more questions I have many many left but if you don't its ok....

Answer 22

Ask away

Answer 23

If there were no energy losses due to friction or unwanted heat transfer, an internal combustion engine could be built for an automobile which would be capable of converting 100% of the combustion energy in gasoline into energy used for moving the car. (Assume 100% of the fuel is burned during combustion.)

I think this is true....

Answer 24

Because 100%=100% and the tank is full so you would burn up all of the gas (without the friction)

Answer 25

Well, I'd comment that energy is still lost to sound (possibly light, although shielding from all heat transfer probably implies that they have this shielded, as heat can transfer as a light wave), but I may be over thinking the question :)

Answer 26

Ok I think I understand what your saying (Kinda!!LOL)

Answer 27

Im sorry i'm not the smartest in this yet........

Answer 28

I'm just throwing a bunch of stuff out there. I'm not sure what level this is for.

Friction and unwanted heat transfer are two of our largest limiting factors when it comes to current engines.

The Carnot engine, which is the most efficient engine that we can design (as far as I know at least) still wouldn't be 100% efficient if that were true, as you'd also need a resevoir held at 0 degrees Kelvin.

Modern combustion engines work on a slightly different principle.

If you burn 100% of the gas, then you release 100% of the energy in the gas. If there is no friction, and there is no unwanted heat transfer, then all of that energy goes to moving the piston. If this is where we define efficiency, then it would be 100%.

However, some of the energy of the piston is used to keep the cycle going (preparing the next piston to fire, reloading this piston, etc), so not all of it gets transferred to the wheels, and thus the ground (if we're talking about a car). If we define efficiency as the energy put in vs the energy used to move the car, it's not 100%, although it's really close.

The second paragraph is likely just me nit-picking, though :)

Answer 29

Ok!!! This makes a lot more sense!!!!!!
9This one makes the most sense) If you burn 100% of the gas, then you release 100% of the energy in the gas. If there is no friction, and there is no unwanted heat transfer, then all of that energy goes to moving the piston. If this is where we define efficiency, then it would be 100%. Thanks!!!!

Answer 30

Heres the next one......
Energy is the ability to do work. In other words, if Ben needed 1000 joules of energy to move a box 5 meters across the floor it would make no difference whether he had 1000 joules of thermal energy or the same amount of mechanical energy. He could still do the work required to get the job done.
I think this one is false because the types of energy aren't the same? Every type of energy is different, right?

Answer 31

Well, it's true in a sense.

The problem is that we have to get those 1000J of Heat energy into a form that can be used to move the box. If we had a machine that was 100% efficient at taking heat and using it to move a box, then it wouldn't matter if the energy was in the form of heat or in the form of mechanical energy.

Thermal energy itself isn't very useful for moving boxes. But engines convert thermal energy into mechanical energy, which you use to move the box. You'd need a 100% efficient, engine to use just 1000J of heat to perform 1000J of work.

Answer 32

Ok, so would thermal energy still be able to be used to be use a box? Since thermal energy is heat energy. Now that I think about it i'm not so sure that it would........ because all of that energy is used to keep the body warm, right?

Answer 33

Thermal energy can, and does, move things, but it's a very diffuse type of energy. If you use an engine to harness and focus it, you can use thermal energy to move the box.

That's the only difference between the two. If he only had 1000J of thermal energy, he'd need a 100% efficient machine to use that energy to move the box to do 1000J of work. With mechanical energy, you can just direct it to where you want it (a block sliding down a hill and pushing the box along at the bottom, for instance).

Answer 34

Ok, so it is true!!!! :) Can you do another one??

Answer 35

sure

Answer 36

If a feather and hammer are dropped on the Moon at the same time from the same height they will hit the Moon’s surface at virtually the same time.

I think that this is true since they are both going towards the same spot at the same time.

Answer 37

Right. They'll experience the same acceleration from gravity, and since there is no atmosphere, they'll hit at the same time. This was actually tested!

Answer 38

Cool!! Ok there is one more question that I want to do tonight because I have other homework 2, but the last question is:
The Moon has no gravity.

I think this is untrue because, is there there gravity everywhere, I understand that there is LESS gravity in space but there has to be some gravity right?

Answer 39

Wait hold on if space has 1/6 the gravity of earth then.... the moon would not have gravity right? But then why does the earth have gravity?

Answer 40

There isn't "less gravity in space" either. Being in space just means that you're further from the gravitational source you are used to.

\[F_g = G \frac{mM}{r^2}\]
G is just a constant, called the Gravitational Constant. m and M are the masses of two objects. r is the distance between these objects.

You can't get away from gravity. It's everywhere!

So why do astronauts float in their space shuttle? Because they are in orbit, which is actually just a free-fall that misses the ground!

Everything that has mass, has gravity. Later on, you may learn about General Relativity, which says that even massless things (such as light) have a gravitational effect.

So yes, the moon has gravity. You'll always be effected by gravity, no matter where you go, but it may not have a net effect on you locally (floating in an orbiting spaceship)

Answer 41

Ok that makes a lot of sense, the only thing im not clear on is that astronauts orbit? Do you mean that when they move they are orbiting something? Dose this happen atomatiocly? Does this happen with everything in space????

Answer 42

When an astronaut is in orbit around a large body, such as the earth, you can think of the ship and the astronaut as both actually in free-fall toward the earth. They don't fall to the ground because they are moving fast enough to the side that they miss the ground.

Since they are both falling at the same rate, they aren't falling relative to one another, and the astronaut floats inside the spaceship.

Answer 43

Ohhhhhh ok! Well thank you so much for the help!!!

Answer 44

My pleasure :)

Answer 45

OK well i'm your fan on this website! So I have more homework in physics and is it ok if I send you a couple of my questions with my reasoning and could you message me back whenever you get a chance! Thanks for all of the messages and explenations! They reallllyyyy helped!!!!!!

Answer 46

That's fine by me. I'm not on every day, so you may want to put them into a question on the website, as well.

Answer 47

Ok! :) Thanks again, bye!