Thermal energy
What is thermal energy?
Total kinetic energy
Temperature is used to find how warm or cold an object is.
12
A spoon fresh from the washer is hot, and is placed in a cup of cold water. What will happen to the water and the spoon?
They will reach the same temperature(equilibrium)
A metal spoon is left in a pot of boiling water. What heat transfer is happening?
Does thermal energy mean temperature?
No
What is temperature?
temperature of: 2,6,7
5
A plate of cold oranges is left on Kyler's table for a hour. When the oranges reaches the same temperature as the room, what is it called?
equilibrium.
As warm air rise, cool air sinks, what heat transfer is happening?
Convection
How to find the thermal energy?
Find the energy of each molecule and find how many molecules there are then sum it up.
How to calculate temperature?
equilibrium of: 1,4,5,3,5 and 1,2,7,2,7
37
I have been in the sun burning for hours while playing soccer. I went back home, and the AC was on. In what direction is heat flow, and when does it stop?
Sun: radiation, stove burner: conduction, conduction needs contact, while radiation doesn't.
Does thermal energy eventually become at the same thermal energy when two objects collide?
Not necessarily, it only happens to be when the two objects are the same size or same amount of molecules.
A cup of hot water is left on a table in a room. Will the temperature of the water increase, decrease, or stay the same?(Please assume that hot water is warmer than room temperature)
It will decrease in temperature.
The average kinetic energy of 1,2,3,4,5...., 100(give answer in decimal form)
50.5
Same sized containers contain water, one of 70 degrees Celsius, another at 40 degrees Celsius. Which cup reaches equilibrium first?
They reach equilibrium at the same time.
Radiation, radiation travels through space as infrared energy.
How is thermal energy related to temperature?(what do you do with thermal energy to get temperature)
Thermal energy needs to be divided by the amount of molecules there is to become the temperature.
Two same sized cups have one that has water at 80 degrees Celsius, the other at 40 degrees Celsius. Which cup will cool faster at the beginning?
The cup at 80 degrees Celsius will cool faster at the start.
The thermal energy of 1,3,5,7,9..., 109
3025
(55*55) quick solve, find arithmetic sequence with difference = 2, find number of terms by n(109) - 1= 108, 108/2 +1 = 55, 55 * (109+1) / 2 = 55*55 -> distribute, 5*11*5*11, 5*5 = 25, 25*11, use formula 2(2+5) 5, = 275, then 275*11, 2(2+7)(7+5) 5, = 3025
A warm object and a cool object are put into an insulated box. Will they reach equilibrium?
Yes.
A pot of water is being heated on a stove, how does conduction and convection BOTH occur in this?
Conduction: heat moves from stove to pot, convection: warm water rises and cold water sinks