PAPER TWO
Q1
(a)
(i) (ii) Find direction of velocity and acceleration (2) -> a downwards vertically, v following line of path
(b)
(i) Find t = 0.69s (2)
(ii) Find u = 7.7 ms^-1 (1)
Q2
LDR = 200k ohms, R = 50k ohms, connected in series
(a) Define ideal ammeter (1) -> no internal resistance
(b) Find current (2) -> 3.6 x 10^-5 A
(c)
(i) Describe what happens to V (2) -> stays same
(ii) Describe what happens to P (1) -> increases
Q3
(a) Formation of absorption spectrum (3)
(b) Calculate energy difference, wavelength 514 -> 309, 6.06 eV (2)
Q4
(a) Difference between sun and red giant (1)
(b) Distance in light years (1) -> 8.8 light years
(c) Find Rx in terms of Rsolar (3) -> 0.011 Rsolar
(d) Last stage of evolution (1) -> white warf
Q5
(a) Direction of magnetic field -> into the page
(b) Why is KE constant -> force does no work
(c) Find u -> 1.1 x 10^7 (2)
(d) Why is gravitational effects negligible -> 10^12 magnitude difference (3)
Q6
(a)
(i) Find speed -> 2.3 x 10^8 ms^-1 (2)
(ii) How does wavelength change (2) -> decreases since wavefronts compress
(iii) Does the light leave block at Q -> no, since 57 degrees > 50 degrees (3)
(b)
(i) Find acceleration -> 0.85 ms^-2 (3)
(ii) What happens to acceleration (1) -> decreases to zero as it reaches terminal speed
(iii) Draw FBD (2) -> upwards arrow of buoyancy, 2 downwards arrow of drag and weight (balanced)
(c)
(i) Find F -> 6.2N (1)
(ii) Find coefficient of dynamic friction -> 0.11 (2)
(d)
(i) Why is there a temperature gradient (2) -> conduction (reference molecules)
(ii) Find new temperature (2) -> -6.6 degrees
(iii) How else conduction (1) -> by friction