Higher Physics 2013 (27/05/2013)

29 degrees, how? What did you do?

for crash test dummy i done t=v\d then impulse to get 25150 negative, you cant use uvast as its not travelling up or down vertically

Please tell me your teacher worked these out!? If so, I have 18/20 wooooo

I got -18V for the op amp question 24c then said it would saturate to -13V, I don't know why I just did a past paper based on that haha someone explain how you know the exact value of when it is saturated?

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yeah it is suitable because the current is like 3 point something

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So what was the answer to the thermocuplem Q, is it suitable?

cos the area under the graph is the energy stored by te capacitor !

My answers were:
1. E
2. B
3. B
4. A
5. C
6. A
7. C
8. E
9. D
10. B
11. D
12. B
13. E
14. A
15. B
16. D
17. B
18. C
19. D
20. D

21 b) 20m
c) 350N
d) as speed increases, air resistance increases. Hence, to keep acceleration constant a greater driving force must be applied to keep the net force constant.

22a)1.2m
b) 7ms-1 at an angle of 73 degrees from the vertical
c) as temperature increases, Ek of particle increases. Hence, particles move faster and hit sides of ball more often, and with greater force. As such the average force applied by the particles increases, and since area is constant, according to P=F/A, the pressure will increase.

23a) the total momentum of an isolated system is the same before a collision as the total momentum after a collision.
b) deltaP=mv -mu
= -16080kgms-1, I.e. 16080kgms-1 to the left.
c) t=0.07s using uvast
Ft=mv-mu
Fx 0.07 = -1005
F= 14.4kN to the left

24a)2.59x10-3m2
b) 41.3m
II) as bubble rises to the surface, pressure due to water decreases. As pressure decreases, volume will increase, as pressure is inversely proportional to volume
C) -15V, or -13V

25a) I) 0.22V
ii) 0.04 ohms
b) current is 3.25A, hence it is suitable (since 3.25>2.5A)

26a) 25Hz
b) 3.20V
c) nothing will happen

27a) I) 16.7mA
ii) E = 1/2 cv2
= 14.7J as required
B) Q=CV
=470x10-6 x 250
=0.1174C

Q=It
I= 587A

P=IV
P= 147kW

C) smaller resistor

28a) out of phase, destructive interference, minima produced
II) 708mm
b) 11 maxima

29a) 29 degrees
b) 42.2 degrees
c) different refraction indexes, different amount refracted, spectrum thus shows component colours.

30a) it does act like a point ssource
b) non divergent, hence irradiance is irrespective of the distance
c) 3.18x10^14 photons
d) laser photons in same direction, lamp not. Laser photons of same energy, lamp not.

31a) I) lithium
ii)11.65x10^-27 kg
b) 78microSv

i don't know how right a few of them are though

Agree with most, but in 27b, the answer is 73500W, as you use p=e/t