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8/7/2019 Answers to Get Fit for Physics Higher
http://slidepdf.com/reader/full/answers-to-get-fit-for-physics-higher 1/3
Answers to Get Fit for Physics Higher
1) (a) displacement = 500km, (b) average speed = 140km/h, (c) average velocity 100km/h @ 143O
2) Average acceleration = 9.91 ms-2
, Random error = +/- 0.17ms-2
3) 37ms-1
4)
5) Question should read “find the internal pressure” Answer = 238 kPa
6) 3.4s
7) Temperature increases
Kinetic energy of molecules increases
Molecules move faster
More collisions with the walls of the container per second
Each molecule makes a bigger impulse against the walls
So Bigger force experienced by the walls of container,
Since P = F/A then pressure will increase.
8)
Area under the velocity time graph can be found as shown. Total area = displacement
Displacement = 8m + 4m + 8m = 20m
8/7/2019 Answers to Get Fit for Physics Higher
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9) Horizontal Velocity = 17m/s vertical velocity = 10m/s
time to reach the wall = 1.5s
Distance up the wall = 3.98m
10) W = QV remember V = the potential difference (350V – 200V)
Answer = 750J
11) 2,500cm3
Solid to gas has a volume change of 1000cm3
12) Ist circuit Total resistance = 2.7Ω
2nd
circuit = 0.5Ω
13) (a) 20Ω (b) 0.6A (c) 9.6V
14) 1.1 x 10-3
g/cm3
15) Each coulomb of charge receives 12 J of electrical energy as it passes through the cell.
(b) 8A
16) n = 1.32
17) 2nd minimum means path difference = 1.5λ
Path diff = 0.60m so wavelength = 0.4m
18) (a) 3m/s2
(b) 24N (c) 24N ( Think action = reaction)
19) (a) 20N (b) 4ms-2
20) (a) VP
= 12V (b) Vrms
= 8.49 V
21) (a) 6.56 x 10-7
m (b) Move screen further away, use a grating with more line spacing per mm.
22) W0 = 2.92 x 10-19
J Doubling the irradiance makes no difference to the photoelectron`s max
kinetic energy it only increases the amount of photoelectrons given off.
23) 4Wm-2
24) 3.628 x 106 Pa
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25) (a) Volt (b) Joule (c) Pascal (d) Farad (e) Ampere
26) (a) 8kgms-1
(b) 4ms-1
(c) impulse = 8 Ns (d) 2N
27) (a) 1.002 x 10-15
J (b) v = 4.7 x 107m/s
28) (a) V = 4.4ms-1
(b) TKB = 32000J TKA = 17424J so collision is inelastic because Kinetic energy is
not conserved, ie TKB > TKA.
29) (b) 6V (c) 2Ω (d) 3A
30) 69kN
31) 2.05 x 105
Pa
32) (a) 0.03 A (b) 0V (c) 0.012 J
33) (a) Red light travels faster in glass because it has a smaller refractive index.
(b) P represents the red end
(c) 0.27O
9d) Gratings have a white central maximum with spectra on each side.
The red part of the spectrum is deviated the most unlike the spectrum created by a prism.
34) 9.9 x 10-7
m
35) 50 m/s. The speed is the size of the resultant vectors of the velocities.
36) (a) 4m (b) 0 to 4 s acceleration = -2m/s2
4s to 5s the acceleration is +6m/s2
(ie bounce) then 5s
onwards the acceleration is -2m/s2
(c) this is the bounce.