CALCULATIONS
Spring constant = 100 Newtons per metre
Force of 3 springs = 0.25 * 100 * 4 = 300 N
Power exerted during chip up = 52 W
Resistance of fixed resistor = 600 Ohms
Total voltage = 9 + 3 = 12 V
Total mass of jetpack and rider = 84 Kg
Acceleration of jetpack rider = 22m/s^2
The jetpack rider will stay balanced as long as the resultant force on him is 0
Current = 0.015 Amps
6 MARKER
Alpha - Range of 3 - 5 cm, deflected by positive pole of magnetic field, least penetrating and stopped by paper.
Beta - Range of 15 cm, stopped by aluminium sheet, penetrates paper, deflected by negative pole of magnetic field.
Gamma - Unlimited range, not deflected as it is uncharged and stopped by thick lead blocks.
Alpha particle made of 2 neutrons and 2 protons
What happens when atom is ionised?
It loses an electron and becomes charged.
What is nuclear fusion?
Small nuclei joining to form bigger nucleus.
STARS
How does a star form?
Gas and dust clump together by gravity, and get denser and hotter. Nuclear fusion occurs and energy and light emitted.
Why can scientists now observe brown dwarfs?
Modern Telescopes have better ranges and resolution.
What does gas ring around other stars show?
Shows that planets are being created elsewhere in the universe.
Why are heavier elements that iron present on earth?
Heavier elements that iron are made in supernova explosions, the earth has elements heavier than iron due to stars exploding.
BALL BEARING
The ball bearing travels faster in hot oil, and so has a smaller drag force as the hot oil is less dense.
Error source?
Students reaction time. He will press stopwatch a little later.
Anomaly caused by starting timer too early
Resolution of voltmeter? 0.01 V Suitable because small changes in voltage can be observed.
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