Questions asked by TK02
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#1/costheta+3sinthetatantheta+4=0# can be expressed as #3cos^2theta - 4costheta -4=0#.
Hence solve the equation #1/costheta+3sinthetatantheta+4=0# for #0<=theta<=360# ?
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The coefficients of #x^2# and #x^3# in the expansion of #(3-2x)^6# are *a* and *b* respectively. Find the values of #a/b# ?
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Which would contain 9.03 × 10^23 oxygen atoms?
A) 0.25 mol aluminium oxide
B) 0.75 mol sulfur dioxide
C) 1.5 mol sulfur trioxide
D) 3.0 mol water
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Which reaction involves a decrease in the bond angle at a carbon atom?
A. bromoethane refluxed with ethanolic sodium hydroxide
B. complete combustion of methane in air
C. ethanol heated with conc. H2SO4
D. polymerisation of ethene
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In which hydride is the H-X-H bond angle the smallest?
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A curve has equation #y=k/x#. Given that the gradient of the curve is #-3# when #x=2#. Find the value of constant #k. #?
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A curve is such that #dy/dx=4/sqrt((6-2x))# and #P(1,8)# is a point on the curve.
1. The normal to the curve at the point #P# meets the coordinate axes at #Q# and at #R#. Find the coordinates of the mid-point of #QR.#
2. Find the equation of the curve?
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Haemoglobin binds oxygen in the lungs to form oxyhaemoglobin. Describe what causes oxygen to be released from the oxyhaemoglobin as blood flows through respiring tissues?
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Describe the role of the ribosome in translation?
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Describe the changes that occur during prophase in an animal cell?
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Describe the role of ribosomes in protein synthesis?
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Describe the role played by tRNA in *translation* and in *polypeptide synthesis*?
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Prove the identity #(1/sinx - 1/tanx)^2 -= (1-cosx)/(1+cosx).# ?
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Relative to an origin O, the position vectors of points A, B and C are given by
#vec(OA)= 0uli + 2ulj + (-3)ulk #
#vec(OB)= 2uli + 5ulj + (-2)ulk #
#vec(OC)= 3uli + pulj + qulk #
(i) In the case where ABC is a straight line, find the values of *p* and *q?
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Particles *P* and *Q* move on a line of greatest slope of a smooth inclined plane. *P* is released from rest at a point *O* on the line and 2s later passes through the point *A* with speed #3.5ms^-1#.
(i) Find the acceleration of *P* and the angle?
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1-bromopropane is a minor product of a reaction.
Explain why 2-bromopropane is the major product of that reaction?
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Explain why 2-bromomethylpropane is the major product of a reaction while only relatively small amounts of 1-bromomethylpropane are produced?
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(i) Show that the value of **k** is 0.1.
(ii) Find an expression for the displacement of the particle from the origin in terms of t?
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Differentiate #(sqrt(x) + 1 )^2/ x# with respect to #X.#?
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Given that D is a point lying on the line through B and C find 2 possible vectors of point D?
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Find the value of *a* for which there is no term independent of *x* in the expansion of #(1 + ax^2)(2/x - 3x)^6#?
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Mechanic help?
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Mechanics, help?
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Solve the question ?
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Functions, Help?
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Quadratics and functions, Help please ?
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Identities, Please Help??
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Please help Q1?
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Determine whether #3x^3 - 6x^2+5x-12# is an increasing function, a decreasing function or neither?
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Find the values of *k* for which #vec(AB)# is a unit vector.?
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State the smallest value of k for which g has an inverse?
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In the case where OAB is a straight line, state the value of p and find the unit vector in the direction of #vec(OA)#?
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Differentiate # y = 9/(2x + 3#?
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Vector question?
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Help with this question?
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Chlorine, Bromine and Iodine all react with hydrogen.
(i) State the trend in the reactivities of the halogens with hydrogen.
(ii) Explain the trend in terms of bond energies.?
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Mechanics help?
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How many esters with the molecular formula #C_5H_10O_2# can be made by reacting a primary alcohol with a carboxylic acid?
A. 4
B. 5
C. 6
D. 8?
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Substance M is refluxed with aqueous sodium hydroxide. One of the products of this reaction reacts with alkaline aqueous iodine to give a pale yellow precipitate. Which compounds could be substance M?
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Find the exact value of #int_0^(1/2pi)x^2sin2x dx#?
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Express #f(x) = (3x)/ [(1 +x)(1+2x^2)]# in partial fractions?