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I GOT A C IN MATH!!! HELPPPP!!!
I got an unexpected one too!! I got an A on 95% in Maths last year in AS and now I got a B!!! I mean I was expecting A* but left that hope after going through a terrible S1 paper, but still...B now!? And got an unexpected A in Chemistry. :( -
24 hrs r up......full time analysis phyx P12
Forces one was 10N, I also first thought it was simply 20, but only by 10N the equilibrium was being established. -
24 hrs r up......full time analysis phyx P12
The force one was 10N, as you had to balance the moments about the pivot. -
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Physics MCQs thread.
Alright this one was quite difficult and took some time. Just concentrate, Q and R are in parallel. If two equal resistors are in parallel, their equivalent resistance is half of their resistance (a fact), like 2Ω and 2Ω would give a total resistance of 1Ω (try yourself out). So suppose the... -
Physics MCQs thread.
Look at the first wave. It is four squares long on X-axis, as one sq=2.5ms, 4 x 2.5 = 10ms. Thus, period is 10ms. Now horizontal line is zero level. Now count the max height above the zero level. It is a little more than 3.5 squares. As 1 sq=5mV on the Y-axis, 3.5 x 5 = 17.5 ~ 17. Thus answer is C. -
Physics MCQs thread.
F=ke. Take force as 12N, so calculate ext i.e. 100-40 = 60mm. So k=F/e = 12/60^-3 = 200Nm^-1, D is the ans. -
Physics MCQs thread.
I explained it earlier too.. Calculate stress first ================= Stress = Force/Cross-sectional area = 20/(pi)(2.5^-4)^2 = 101.9 x 10^6 Pa Stress/strain = Young Modulus strain = extension/length 101.9 x 10^6/(e/l) = 2 x 10^11 Calculate the ratio (e/l) ==================== e/l = 5.1 x... -
Physics MCQs thread.
If motion is perp to acc consider a particle launched horizontally in the air. The perp acc is g acting on it. So it's horizontal speed will remain constant (a fact) wheras it's direction will change due to the downward force acting on it. -
Physics MCQs thread.
Ans is D. Do your math and get the total to +1 (the charge of a proton). 2/3 x 2 - 1/3 = +1 -
Physics MCQs thread.
μ = 10^-6 G = 10^9 Therefore (10^-6)/(10^9) = 10^-15, D is the ans. -
Physics MCQs thread.
It's quite obvious that electrons are in total random motion everywhere even when electricity is not being passed. When a current is passed they move in an order, so A is the answer. -
Physics MCQs thread.
Mass is a constant 'm'. Speed changes from 2v to v. -
Physics MCQs thread.
As this is a simple addition/subtraction one, add the two uncertainties = 0.03. The absolute answer is 0.44. Now calculate the %, 0.03/0.44 x 100 = 6.818 ~ 7. -
Physics MCQs thread.
The answer is C guys. Look, the initial momentum is 2mv. Since it's in an INELASTIC collision and it's said that it'll rebound, meaning it will lose it's speed. So as mass is constant, only C is the option where the rebound speed is less than the initial (2v>v). So m[2v-(-v)] = 3mv. -
Physics MCQs thread.
The answer is A, but can anybody explain me properly why are we subtracting the velocities? Don't we add the velocities when they are in the opp directions and subtract when they're in the same direction?? :%) -
Physics MCQs thread.
The question is already asked earlier in the thread. The ans is A as the circuit is unchanged. -
Physics MCQs thread.
Q=It, so I=Q/t, I=Qf there are 4 charges and f=1, that means there is a constant flow of 4 charges in 1 second. so I =4Qf, A is the ans. :) -
Physics MCQs thread.
Calculate stress first ================= Stress = Force/Cross-sectional area = 20/(pi)(2.5^-4)^2 = 101.9 x 10^6 Pa Stress/strain = Young Modulus strain = extension/length 101.9 x 10^6/(e/l) = 2 x 10^11 Calculate the ratio (e/l) ==================== e/l = 5.1 x 10^-4 therefore for % multiply... -
Physics MCQs thread.
Take the resultant vector of 3 and 4 by the pythagoras theorem. The 3 and 4 N forces will be perpedicular to each other while the 5 N force will act at the vertex of it.