1 Flashcards
(18 cards)
What are the three temperature scales mentioned?
Celsius, Fahrenheit, Kelvin
Heat is produced by doing work or by providing energy in some form other than _______.
heat
What type of energy produces heat when rubbing palms together?
mechanical energy
What type of energy produces heat when passing current through a metallic wire?
electrical energy
What type of energy produces heat when burning coal?
chemical energy
How does heat energy flow between a hot body and a cold body?
from hot body to cold body
What is internal energy of a body composed of?
internal kinetic energy and internal potential energy
What happens to the internal energy of a cold body when it comes into contact with a hot body?
it increases
What happens to the internal energy of a hot body when it comes into contact with a cold body?
it decreases
What is the unit of heat in the SI system?
joule (J)
What is the CGS unit of heat?
erg
How many ergs are in one joule?
10^7 erg
What is the relationship between kilocalorie and calorie?
1 kilocalorie = 1000 calories
How many joules are in one calorie?
4186 J
What defines heat according to the text?
the energy of random motion of molecules constituting the body
True or False: A hot body has less internal energy than a cold body.
False
When touching warm water, why do we feel hot?
heat energy from warm water passes to our hand
When touching a cube of ice, why do we feel cool?
heat energy from our hand passes to the cube of ice
