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ALL CIE PHYSICS DOUBTS HERE !!!

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ashwinkandel:
MCQ Day 3: Today i got problem with 9 questions while solving 4 sets . I have attached 4 questions in this post and remaining 5 in the next post. I've got exams in 24th Nov so immediate help required.

ashwinkandel:
Remaining Questions(5-9) attached below

astarmathsandphysics:
For the first, take moments about the point where the floor meets the wall to get A.
For second question apply F=ma to each mass
For 2 kg 2g-T=2a
for 8 kg mass
T-6=8a
Add these to get 2g-6=10a soa=(2g-6)/10=1.4m/s^2
for third question use paralel resistor formula 1/R=1/10+1/10+1/10+1/10+1/10+1/10+1/100=0.61 so R=1/0.61 =1.6 ohms
4th quest P=IV*0.8
4000000=25000*I*0.8 so I=200A

astarmathsandphysics:
5th question
sin theta =n*wavelength/d
d=1/300000, the width of 1 slit so sin theta =n*450*10^-9/(1/300000) =n*0.135
sin theta is at most 1 so n<=1/0.135=7.4 but since n is whole number it can be at ost 7
6th question F*0.6+F*0.6=900*0.2
F=150N
7th question half the water falls by h/2 so loss in gpe =mgh/4
8th question The excess pressure is rhog(h_2-h_1)=rho g (2h)
9th question all kinetic energy of electron is changed into potential energy of the field 1/2 mv^2 =qV=qEx so x=(1/2 mv^2)/(qE)

angel_ak:
In the equation shown below, C is the heat capacity of a solid and T is the temperature in kelvins.

C = aT + bT3

(a) What is the unit of C?
(b) What are the units of a and b?

i found the units of C.... kgm2s-2K-1
but how to find that of a and b?

i know its easy but silly me :(

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