Answers edited by Ultrilliam

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• Rope of length 80m and mass M is connecting two rods 50 meters high. The minimum distance of the curve from the ground is 10 meters. How far are the two rods apart?
  
• How to prove ?
  
• D (log sin cos tan e^cosx)/dx ?
  
• Determine if F is a linear transformación f(x,y,z)=(x,x+y+z) ?
  
• I have a Work word problem I need help completing?
  
• A particle of mass m moves under the force given by F = a(sinωt i +cosωt j). a,w are constants and t is time.It is intially at rest at the origin.What is work done on the particle up to time t and the instantaneous power given to the particle at time t?
  
• Why isn't #dy/dx = 3x + 2y# a linear differential equation?
  
• How do you find the antiderivative of #e^( -x)*cos2x#?
  
• The cost of fuel is running an engine is proportional to the square of the speed in km/h is ₹48 per hour when the speed is 16 kn/h.Other costs amount to ₹300 per hour.Find the most economical speed?
  
• How do you find the equations for the tangent plane to the surface #f(x,y)=2-2/3x-y# through (3,-1,1)?
  
• Consider two insulated chambers (A,B) of same volume connected by a closed knob, S. One mole of perfect gas is confined in chamber A. What is the change in entropy of gas when knob S is opened? ( R= 8.31 )
  
• Find the differential of the following function?: y = sin 5x^3
  
• #int int_R e^(-(xy)/2)dA# where #R#:the region bounded by #y=1/4x,y=2x,y=1/x,y=4/x# Evaluate integrals?
  
• Find curl F for the vector field at the point (9, -9, 7). F(x,y,z) = x^2zi - 2xzj + yzk ?
  
• Answer question a) why does A = A (t) = 6x^2? ,
  
• Integrating factor question?
  
• Solve it please. "?"
  
• Evaluate the limit #lim_(x to pi) (e^sinx -1)/(x-pi)# without using L'Hôpital's rule?
  
• Linear/Separable Differential Equations Question (Engineering First Year Calculus)?
  
• Does amplitude of a spring mass system change when mass is added?
  
• Can you help me with this double integral?
  
• If a particle moves with acceleration = #10x-2x^3# and v= 0 at x=1, is the motion simple harmonic? And how do you describe the motion?
  
• Solve this differential equation explicitly, either by using partial fractions, or with a computer algebra system. Use the initial populations 350 and 450. Can anyone please help me with this problem and explain how you got the answers?
  
• How to calculate average pressure as volume changes via intergration?
  
• Evaluate the integral?
  
• Two springs are in a series combination and are attached to a block of mass 'm' which is in equilibrium. Spring constants:k and k’ Extensions:x and x’ respectively. Find the force exerted by spring on the block?
  
• The value of #lim_(h→0)1/hint_2^(2+h)sin(x^2)dx#is?
  
• A particle of mass m strikes a wall at an angle of incidence 60° with velocity V elastically. Then the change in momentum is?
  
• Light of wavelength 5000 Å and intensity 39.8 W/m² is incident on a metal surface. If only 1% photons of incident light emit photo electrons, then what will be the number of electrons emitted/sec/unit area from the surface?
  
• A person moving on earth's surface starts from north and moves 500km towards south and then moves 1000km towards East and then again 500km towards north and stopped.find the magnitude of the displacement of the person ?(assume earth to be perfect sphere)
  
• Physics Work and Energy Question?
  
• Help with the next complex variable limit?
  
• Find the instaneous rate of change of y=2x+3 ?
  
• What is the derivative of #Tan^-1 (y/x)#?
  
• For derivation of equation for stationary wave, y1=Asin(kx-omega t) and y2=Asin(kx+omega t) are considered. Why y1=Asin (kx-omega t) and y2=Asin(kx+omega t+pi) cannot be used to derive?
  
• How to find the curvature K of the curve?
  
• How can Newton's first law be derived from Newton's second law?
  
• Graph the parametric equation x(t)=3t and y(t)=2-2t on [0,1] ?
  
• Is Electric potential and e.m.f are same or different terms?
  
• How to derive this relativistic Energy-Momentum relation?
  
• How do you determine the concavity of # y=2cosx+sin2x#?
  
• How do you find the lim & definite integrals ? for :{lim as x approaches 0 (1/x^3) * integrals (t^2/t^4+1)dt} intervals{0,x}
  
• If #hat(a_1),hat(a_2)and hat(a_3)# are unit vectors and #2hat(a_1)+2hat(a_2)+hat(a_3) =0# then angle between #hat(a_1) and hat(a_2)# is ?
  
• What is the Fourierseries of the following equation?
  
• What is diffraction a result of?
  
• How is impulse related to momentum?
  
• The electric potential is V= 5x − 3x^2y+2yz. Find the expressions for the x, y, and z components of the electric field over this region. What is the magnitude of the field at the point P that has coordinates (1, 0, -2) m?
  
• Integral of [x+3÷(5-x²-4x)½]dx?
  
• If d^(2)x/dt^(2)+g/b(x-a)=0,(a,b,g being positive constants) and x=a' and dx/dt=0 when t=0,show that x=a+(a'-a)cos{√(g)/(b)t}?
  
• How about Answer ?
  
• 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 ?
  
• How do i evaluate this double integral, the integrand is y^1/2*sin y dydx? x^2 < y < 1 0<x< 1
  
• Solve L(sin4t) ?
  
• Show that the nuclear density of 1H1(mass no-1&atomic no-1)is over 10^14 times greater than its atomic density (assume the atom to have the radius of the first Bohr orbit).In this question,what should I put for nuclear mass&atomic mass?
  
• Potential energy of mass m is U(x)=Eₒ,when 0≤x≤1, =0when x≻1.The total energy of the particle is 2Eₒ. The De Broglie wave length of the particle is λ₁ when 0≤x≤1 and λ₂ when x≻1. what is the ratio of λ₁ and λ₂ ?
  
• If (1+i)(2+i)(3+i)....(n+i)=a+ib then show that 2.5.10....(n^2+1)=a^2+b^2 ?
  
• A block of charge q and mass m is connected to a spring of constant k. An electric field E exists parallel to the ground. The block is released from rest from a unstreched spring. Find Maximum displacement?
  
• Find the value of the line integral F · dr C (Hint: If F is conservative, the integration may be easier on an alternative path.) (x2 + y2)dx + 2xy dy?
  
• Let #F(x)=int_0^x e^(-5t^4)dt#. Find the MacLaurin polynomial of degree 5 for F(x)?
  
• A projectile is thrown with the speed 'u' at an angle '⍬' to the horizontal. What is the radius of curvature of it's trajectory when the velocity vector of the projectile makes an angle '⍺' with the horizontal?
  
• FInd numeric value of #int_1^esqrt(lnx)dx-int_0^1e^(x^2)dx#?
  
• PROBLEM 10 A point describes a circumference according to law s (t) = t³ + 2t² where s measured meters along the circumference and, in seconds. If a total acceleration of the point is 16 2 m / s2, when t = 2 s.calculate the radius R of the circumference?
  
• Solve the intergral ?
  
• Can someone help me check if this matrix is diagonalisable?
  
• Find the value of the line integral. F · dr C (Hint: If F is conservative, the integration may be easier on an alternative path.) F(x, y) = yi − xj?
  
• Find the complete integral of the equation (∂z/∂x_1)(∂z/∂x_2)(∂z/∂x_3)=z³x_1x_2x_3?
  
• Relativity problems?
  
• How to solve with integration?
  
• Ordinary boron is a mixture of 10B5(mass no=10,atomic no=5)&11B5(mass no=11,atomic no=5)isotopes & has a composite atomic mass of 10.82u.What percentage of each isotope is present in ordinary boron?
  
• Determine the Fourier series expansion for full wave rectified sine wave i. (details inside)?
  
• A meteorological balloon of mass 0.2 Kg falls vertically from rest, the total resistance at V m/s is approximately (1+0.1V)N taking g=9.8 m/s^2# . Calculate: a) The terminal velocity? b) Time taken for the balloon to reach half of the terminal velocity?
  
• #intint_D cosxy dxdy#, where #D: {[x>=0],[y>=0],[x>=y]}#?
  
• A ladder 5m long is standing vertically, flat against a vertical wall, while its lower end in on the horizontal floor. ... Find the speed at which the upper end is moving down the wall 4 seconds after the lower end has left the wall ?
  
• How do you find the area of the region bounded by the spiral #r=7theta# for #0<=theta<=pi#?
  
• The sum of A and B is 5i+j and their difference is 3i-j what is vector A?
  
• Find the value of the line integral.F · dr (Hint: If F is conservative, the integration may be easier on an alternative path.) F(x,y) = ye^xyi + xe^xyj (a) r1(t) = ti − (t − 8)j, 0 ≤ t ≤ 8 ?
  
• Help me please, Two particles each of mass m, are joined by a thin string of length 2L, as shown in Figure 48. A uniform force F is applied in the middle of the string (x = 0) forming a right angle with the initial position of the string. Show that th????
  
• A stone is thrown into a circular pond of radius 1 meter. Suppose the stone falls uniformly at random on the area of the pond. What will be the expected distance of the stone from the center of the pond?
  
• What is the angle between A×B andB×A?
  
• How to Find the directional derivative of?:
  
• If vector P+vector Q=vector R ;and if P^2+Q^2=R^2 then find the angle between the vectorP and vectorQ?
  
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