Answers created by Carlos S.

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• Question #9a548
  
• How do you simplify (2k)!/(2k+2)! to 1/(2(k+1)(2k+1)) ?
  
• A #5 L# container holds #8 # mol and #10 # mol of gasses A and B, respectively. Every five of molecules of gas B bind to two molecule of gas A and the reaction changes the temperature from #360^oK# to #270 ^oK#. By how much does the pressure change?
  
• A body weighs 900N on earth's surface. At a distance of twice earth radius above the earth's surface , the weight of the body is: *100N *200N *300N *450?
  
• How do you find the value of two numbers if their sum is 12 and their difference is 4?
  
• An object with a mass of #120 g# is dropped into #640 mL# of water at #0^@C#. If the object cools by #48 ^@C# and the water warms by #3 ^@C#, what is the specific heat of the material that the object is made of?
  
• Which of the figure below is the image of the arrow in a plane mirror?
  
• How do you differentiate # f(x)=(1-e^(3sqrtx))^2# using the chain rule.?
  
• Question #5230c
  
• Question #34c4e
  
• The work- function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately ?: (1) 540 nm (2) 400 nm (3) 220 nm (4) 310 nm
  
• How do you differentiate #f(x) =x/(e^(3-x)+x^3)# using the quotient rule?
  
• Question #d8599
  
• Question #0c063
  
• How do you find the integral of ∫ dx/(1-x)^2 from negative infinity to 0?
  
• From a rifle of mass 4 kg, a bulle of mass 50 g is fired with an initial velocity of 35 m s^-1. What is the the initial recoil velocity of the rifle?
  
• An object with a mass of #1 kg#, temperature of #320 ^oC#, and a specific heat of #25 J/(kg*K)# is dropped into a container with #16 L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?
  
• Question #56175
  
• How do you condense #1/2(log_4(x+1)+2log_4(x-1))+6log_4x#?
  
• What is the distance between the following polar coordinates?: # (6,pi/3), (0,pi/2) #
  
• What is the path of the light ray that hits a mirror after passing through its focus?
  
• An object with a mass of # 14 kg# is lying still on a surface and is compressing a horizontal spring by #1 m#. If the spring's constant is # 7 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
  
• Question #fe9da
  
• How do you find #f(x)+g(x), f(x)-g(x), f(x)*g(x), (f/g)(x)# given #f(x)=3/(x-7)# and #g(x)=x^2+5x#?
  
• An arched bridge is to be designed that cars may pass over safely a a speed of 180km/h without jumping off the road.what should the minimum or maximum value of the radius of curvature of the arch be?