Paper 2 content Flashcards
Why is temperature constant when changing state
energy is used to overcome potential energy
Define thermal eqm
heat flow stops when it reaches the same temp.
what does ΔU +ve mean
the system gains internal energy
what does +ΔQ mean
system gains heat energy
what does ΔWD mean
work done by the system
define specific heat capacity
energy to raise 1kg of mass by 1 deg. without change of state
define specific latent heat
energy needed to change 1 kg of mass from one state to another without raising its temperature
what state to what state is fusion
solid to liquid
what state to what state is vapourisation
liquid to gas
similarity of gravitational and electric field [2]
- follow inverse sq. law
- use field lines to represents
- have equalpotential lines
differences between gravatational and electric fields [2]
- g-fields always attract
- electric field repels/attract depends on charge
- acts on different body (masses/charges)
define fields
a region at which a body experiences a non-contact force
What is the gravatational potential at infinity
0
main idea of Kepler’s 3rd law
T^2 = r^3
how to calculate potential difference
ΔV = Vf -Vi
gradient of potential and seperation
field strength
area under field strength and seperation graph
change in potential
define geosynchronous orbit
orbits in the same period as the planet’s
define geostationary
special e.g. of geosynchronous
stay above the same spot of the planet
name one use of low orbit
weather
direction of electric field lines
+ve to -ve
define absolute electric potential
WD per unit charge to bring it from infinity to point
What happens potential when moving closer to +ve charge
increases - as WD needed for +ve test charge to get closer
what happens to potential when moving away from +ve Q
decreases - no WD by test charge as there’s repulsion
what happens to potential when moving towards -ve Q
decreases - WD by field - as attracted
what is the effect of opposing electric field on capacitance
- greater electric field strength
- increases permitivity
- greater capacitance
RC and half life conversion
t1/2 = 0.69RC
define magnetic flux density
Force per metre of wire carrying 1A perpendicular to the field