PHYSICS PAPER 2 questions
and nswers
1. How can you find the specific heat capacity of a liquid using a continuous
flow calorimeter?: - Set up the equipment and let the water flow until it is out at a
constant temperature een water in
- Record the flow rate of water, m, and temperature difference, ”¸b(etwwasted
and water out) and current and pd, I & V
- Energy supplied to the water is Q•= m •”c¸ +H , where H is energy lost/
- Repeat, only changing pd and flow rate (m) so ”r¸emains constant to get a second
Q‚=m‚c”¸
- Since c, H and ”a̧re the same, Q‚-Q• = (m‚-m •”)¸tc,h e n rearrange for c
2. What is a mole?: The amount of a substance containing 6.02 x 10²³ identical
particles
3. What assumptions can be made about an ideal gas? (8): - Particles are
identical;
- The gas has a large number of molecules;
- Particles have negligible size (to container);
- No forces between particles;
- Newtonian mechanics apply;
- Random motion;
- Elastic collisions (no KE lost);
- Time for each collision is much shorter than time between collisions
4. State 4 assumptions about the motion of the molecules in a gas in the
derivation of the kinetic theory of gases equation: (pV = Nm“²/3:)- All collisions
are elastic
- Time for collisions is much shorter than time between collisions
- Molecules move in straight lines between collisions
1/5
, PHYSICS PAPER 2 questions
and nswers
- Molecules have random motion
5. What is the equation for gravitational potential?
Why is it negative?: V = -GM/r
At infinite distance, gravitational potential is 0, and work has to be done to move a
mass to infinity
6. What do electric field lines in diagrams show?: The direction a positive charge
would move/experience a force
7. The higher the permittivity of a material...: The more charge is needed to
generate an electric field of a given size
8. What happens (in terms of electrons) when you charge a capacitor using a
DC supply? (3): - Electrons flow from the negative supply terminal to the plate, so
a negative charge builds up on that plate.
- At the same time, electrons from the other plate flow to the positive supply terminal,
building up a positive charge on the plate.
2/5
and nswers
1. How can you find the specific heat capacity of a liquid using a continuous
flow calorimeter?: - Set up the equipment and let the water flow until it is out at a
constant temperature een water in
- Record the flow rate of water, m, and temperature difference, ”¸b(etwwasted
and water out) and current and pd, I & V
- Energy supplied to the water is Q•= m •”c¸ +H , where H is energy lost/
- Repeat, only changing pd and flow rate (m) so ”r¸emains constant to get a second
Q‚=m‚c”¸
- Since c, H and ”a̧re the same, Q‚-Q• = (m‚-m •”)¸tc,h e n rearrange for c
2. What is a mole?: The amount of a substance containing 6.02 x 10²³ identical
particles
3. What assumptions can be made about an ideal gas? (8): - Particles are
identical;
- The gas has a large number of molecules;
- Particles have negligible size (to container);
- No forces between particles;
- Newtonian mechanics apply;
- Random motion;
- Elastic collisions (no KE lost);
- Time for each collision is much shorter than time between collisions
4. State 4 assumptions about the motion of the molecules in a gas in the
derivation of the kinetic theory of gases equation: (pV = Nm“²/3:)- All collisions
are elastic
- Time for collisions is much shorter than time between collisions
- Molecules move in straight lines between collisions
1/5
, PHYSICS PAPER 2 questions
and nswers
- Molecules have random motion
5. What is the equation for gravitational potential?
Why is it negative?: V = -GM/r
At infinite distance, gravitational potential is 0, and work has to be done to move a
mass to infinity
6. What do electric field lines in diagrams show?: The direction a positive charge
would move/experience a force
7. The higher the permittivity of a material...: The more charge is needed to
generate an electric field of a given size
8. What happens (in terms of electrons) when you charge a capacitor using a
DC supply? (3): - Electrons flow from the negative supply terminal to the plate, so
a negative charge builds up on that plate.
- At the same time, electrons from the other plate flow to the positive supply terminal,
building up a positive charge on the plate.
2/5
