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http://onlineexamhelp.com/wp-content/uploads/2013/11/9702_w12_qp_13.pdf
can someone pls help me with question 33, the answer is D
C ?View attachment 54599
How to do this one?
Nope ... it's B
It's a simple parallel and series circuit. Look the resistor with the junction is parallel to the three resistors with no junction between them. So, add 10+10+10 = 30 then solve for 30 and 10 as in a parallel circuit. Thus product/sum = 10x30/10+30 which is 7.5 which is B ie between 1 and 10 ohms.View attachment 54601
How to do this one??
If the heating element is glowing light red, it's between 800 and 900 degrees.
ThanksElastic energy per unit volume = (½ Fx) / AL.
= Sx / 2L [F / A = S]
= S {strain} / 2
[Young modulus, E = stress S / strain. So, strain = S / E]
Elastic energy per unit volume = SS / 2E = S2 / 2E
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