hi everyone, hope the exams went well! just wanted to share some of my p2 answers:
for the kinetic energy (and therefore also the gravitational potential energy afterwards) I got 3.6J, and for the height of the rocket I got 7.2 metres
for the maximum speed I got 22.5m/s
for the current shown on the graph I got 1.7A, for the charge I got 51 coulombs and for the energy transfered I got 612J
for the velocity of the cars after the collision I got 5m/s
for the resistor with the greatest resistance I put C because it had the least steep gradient so it allowed the least current to flow through
for the wires that prove length of wire affects resistance I put K and L because they were made from the same material, and K had half the resistance of L and was also half the length of L
for 'what is nuclear fission' I put that it is the splitting of complex and unstable atomic nuclei into simpler nuclei, releasing energy and two or three neutrons
for 'what is meant by braking distance' I put that it is the distance travelled by the veichle under the braking force
for the six mark question I put:
- highly concentrated but tiny positive charge in centre of atom called nucleus
- protons have a relative mass of 1 and a charge of +1
- neutrons have a relative mass of 1 and a charge of 0
- both subatomic particles make up the nucleus
- most of the atom is empty space
- electrons are arranged in shells around the nucleus
- electrons have a mass of 1/1840 and a charge of -1
- an atom has an equal number of protons and electrons as there is no overal charge
that's pretty much all I can remember tbh, think it went alright!