Questions asked by Wricheek

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• Can anyone explain the concept of derivatives?
  
• In a Covalent Bond how The same electron can rotate in two atoms?
  
• ABC is a Right Triangle ,right angled at B. C(o,r) is the incircle and o is the incenter of the triangle.AB=5,BC=12,what is the radius of incircle?
  
• An object of length #2cm# is placed at a distance of #2.5*f# from a concave mirror where f is its focal length. what is the length of the IMAGE?
  
• A rod of length #f/2# is placed along the axis of a concave mirror of focal length #f#.IF the near end of the REAL IMAGE formed by the rod just touches the far end of the ROD,what is its magnification?
  
• I have some chair and tables.If i place two chair at each table ,I have extra chair.If i place 3 chairs at each table,i have one table with no chairs.What is the sum of the total umber of tables and chairs?
  
• #sinx+sin^2x+sin^3x#=1 the what is #cos^6x -4cos^4x+8cos^2x#=?
  
• #7cosec theta -3 cot theta =7#,then what is the value of 7#cot theta-3 cosec theta # ?
  
• How to give symbol of modulus?
  
• 8g of #"E"_2"O"_3# contain 5.6g of #"E"#. How many moles of #"E"# does a 16.8-g smaple of element #"E"# contain?
  
• For the reaction,#2x#+#3y#+#4z## rarr## 5w# Initially if 1 mole of #x#,3 mole of #y# and 4 mole of #z# is taken and 1.25 mole of #w# is obtained then what is the % yield of this reaction?
  
• When 2 moles of hydrogen is heated with 2 moles of iodine,2.96 moles of hydrogen iodide is formed.what is the equilibrium constant for the formation of hydrogen iodide?
  
• A block of metal wheighing 2 kg is resting on a frictionless surface,if struck by a jet releasing water at the rate of 1kg/s and at a speed of 5m/s.what is the initial acceleration of the block ?
  
• A dish of mass 10g is kept horizontally in air by firing bullets of mass 5g each at the rate of 100/s. I the bullets rebound with the same speed,what is the velocity with which bullets are being fired?
  
• A ball of mass 0.20 kg falls freely from a certain height and rebounds elastically with a speed 10m/s.What is the change in momentum of the ball?
  
• If #sin theta + cos theta =p#, what is #sin^2 theta + cos^4theta# in terms of #p# ?
  
• What are progessive lens?
  
• When are important subjects like economics are going to be added?
  
• Why most of the alkanes are Hydrophobic in nature?
  
• What is the principle of LIKE DISSOLVES LIKE ,EXPLANATION needed,and also limitations?
  
• Sea water contains #65 xx10^-3# #"g/L"# of bromide ions. If all the bromide ions are converted to produce #Br_2#,how much sea water is needed to prepare 1 kg of #Br_2#? please tell the method.
  
• What is the strength in g/ litre of a solution of #H_2SO_4#,12 ml of which neutralized 15 ml of N/10 NaOH solution?
  
• #200# ml solution of #H_2O_2# completely oxidises 125g # Fe^+#. Find out the molarity and volume strength of #H_2O_2#?
  
• WHAT is the domain of defination of #log_4 (-log_1/2 (1+ 6/root(4)x) -2)#?
  
• What is the domain of defination of #y= log_10 (1- log_10 (x^2 -5x +16))#?
  
• A particle is projected from the origin #(0,0)# in the #xy# plane at angle of #37^o# with the x axis with a speed of #10# #ms^-1#, its acceleration being #(-5 hati + 10 hatj)# #ms^-2#. What is the speed of the particle when the x-coordinate is again zero?
  
• The equation of the trajectory of particle is #x=sqrt3 y-5y^2#.The particle is at t=0 at origin.Its acceleration is #veca=-10 hati#.What is its initial velocity?
  
• Given #3 TanA*TanB=1#,show that 2cos(A+B)=cos(A-B) ?
  
• What is the velocity of a particle for #t=0 to t=10# whos acceleration is #veca =3t^2 hati+5t hatj-(8t^3+400)hatk#?
  
• An electron in a hydrogen atom in its ground state absorbs twice of its ionization energy what is the wavelength of the emitted electron?
  
• Why cant we upload more that one pictures on answer? It takes a long time to write coding ,especially while in calculation,we can easily write on paper and upload the picture?
  
• A butterfly is flying with velocity #10 i +12 j m/s# and wind is blowing along x axis y with velocity u. If butterfly starts motion from A and after some time reaches point B, What is the value of u ?
  
• What is the proof of# E=mc^2#?
  
• Having errors while solviing maths is a common problem,is there any tip to study longer better and accurate?
  
• Three rods each of mass M and length L, are joined together to form an equilateral triangle. What is the moment of inertia of a system about an Axis passing through its centre of mass and perpendicular to the plane of the triangle?
  
• At #627^@"C"# and #"1 atm"#, #"SO"_3# is partially dissociated into #"SO"_2"# and #"O"_2# . If the density of the equilibrium mixture is #"0.925 g/L"#, what is the degree of dissociation?
  
• A small block is placed on a wooden plank which is undergoing SHM in vertical direction with a period of T.What is the maximum amplitude of motion so the block does not leave the plank?
  
• Let #x,y,z# are three real and distinct numbers which satisfy the Equation #8(4x^2+y^2)+2z^2-4(4xy+yz+2xz)=0#,then Which of The following options are correct? (a) #x/y=1/2# (b)#y/z=1/4# (c)#x/y=1/3# (d)x,y,z are in A.P
  
• A point moves in #x-y# plane according to #vec r=3cos(4t)veci +3(1-sin4t) vecj#. What is the distance travelled by the particle in 0.5 sec ?
  
• A bead of mass #m# can slide on a thin vertical rod,with sliding coefficient #mu =0.4#.The rod is translated horizontally with a constant acceleration of #a#. QUESTION below.?
  
• What is the range of the function #y=sqrt(1-cosxsqrt(1-cosx(sqrt(1-cosx ......oo# ?
  
• How to Remove Nitro Group from nitrobenzene ring ?