physics chapters 21-24
suppose you put a closed, sealed can of air on a hot stove burner. The contained air will undergo an increase in _____ , ____, and ____.
Internal energy, temperature and pressure
the first law of thermodynamics is a restatement of what other law?
Law of Conservation of Energy. There are a few ways of stating it, but they all mean the same thing: Energy is neither created nor destroyed. It can only change form.
absorber
absorbing the energy of sudden impulses or shocks in machinery or structures (black surface, shock)
which cools at a faster rate, a pot of boiling water left at room temperature or a same size pot of luke warm water left at room temperature?
boiling water
how can the energy count of a piece of food be measured?
calories
when a volume of air expands and no heat enters or leaves, the air temperature will
decrease
describe when heat transfer by conduction occurs
direct contact
adiabatic process
energy only transferred as work
conduction
heat transfer through direct contact (placing a hot stick to fire)
when a volume of air compresses and no heat enters or leaves, how will the air temperature be affected?
increase
what units is heat measured in?
joules or calories
increase in entropy
less error
entropy
measure of the molecular disorder, or randomness, of a system. (error)
decrease in entropy
more error
specific heat capacity is related to:
needed to change the temperature of one gram of a substance one degree (J/C)
by what process does heat travel from the sun to the earth?
radiation
emitter
something that gives energy (black clothes)
insulator
something that traps heat (bird's fluffy feathers)
when a gas is heated in a closed container, the internal pressure increases. What is the best reason for the increase in pressure?
the average kinetic energy of the gas molecules increases
when does heat by convection occur?
thermal energy transferred from hot to cold objects without contact