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The given angle is irrelevant, vector v is still perpendicular to vector B.

What is a prism?

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No tricks. The given answer needs scrutiny.

very true any other answers to the reaction force question (a few post back)?

any other answers?

Here is a simple mechanics question. A 1 kg block is at rest on a rough plane inclined at 30 degree angle to the horizontal. Find the magnitude and direction of the reaction force of the plane on the block.

Sorry that I misled you. I wonder why my mistakes were not pointed out. d^2=2a/(a+b) is ok. Points 0f contact of the 2 curves are at x=y=+/-sqrt(a/(a+b)), and gradient =-1. Hence b=0 and d=sqrt2.

at the point (2 of them) of contact, y=x, the circle and the hyperbola are symmetrical about the line y=x, .: a=b

try to sketch the two graphs meeting the constraints

y(ax+by)=c, x^2+y^2=d^2 using given info, x(ax+bx)=a, x^2+x^2=d^2 .: d^2=2a/(a+b) and the hyperbola must be tangential to the circle which requires a=b .: d=1

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4.3.2 / 6.5.4 = 1/5

4^3 / 6^3 =8/27

yes, I also like this type of questions

2I=pi/2, I=pi/4

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Let z=rcis@, z^6=|z|^2, r^6 cis6@=r^2, cos6@ + isin6@=1/r^4, cos6@=1/r^4 and sin6@=0 .: 6@=2npi, @=npi/3, r=1 .: z=cis(npi/3) where n=0, +/- 1, +/- 2, 3. i.e. z=1, 1/2+irt3 /2, 1/2-irt3 /2, -1/2+irt3 /2, -1/2-irt3 /2, -1

Both (a) and (b) are right. stupid choices

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