Saturday
August 23, 2014

Posts by karim


Total # Posts: 9

Science
How much 0.1 M KCl is needed to dissolve 10 gm of precipitate?
February 25, 2014

calculus
3. Plot f(x) =ln(x) and f’(x) = 1/x in your calculator. Remembering that the derivative of f(x) is the instantaneous rate of change of f(x) why does it make sense that 1/x is the derivative of ln(x)?
February 10, 2014

physics
0.5 mol of salt (NaCl) is dissolved in 4.5 mol of water. What is the increase in entropy
October 1, 2013

math
sin42=165/x
January 11, 2012

chemistry
given the following data at a certain temperature, calculate K for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give dinitrogen tetraoxide 2N2 + O2 TO GIVE 2N2 K=1.2X10-35 N2O4 TO GIVE 2NO2 K=4.6X10-3 1/2N2 + O2 TO GIVE NO2 K=4.1X10-9
March 7, 2011

physics
A 13 N horizontal force pushes a block weighing 4.5 N against a vertical wall (Fig. 6-26). The coefficient of static friction between the wall and the block is 0.68, and the coefficient of kinetic friction is 0.35. Assume that the block is not moving initially. In unit-vector ...
March 6, 2011

physics
You pull a short refrigerator with a constant force across a greased (frictionless) floor, either with horizontal (case 1) or with tilted upward at an angle 38° (case 2). (a) What is the ratio of the refrigerator's speed in case 2 to its speed in case 1 if you pull for...
March 5, 2011

physics
A hot-air balloon of mass 200 kg is descending vertically with downward acceleration of magnitude 1.2 m/s2. How much mass (ballast) must be thrown out to give the balloon an upward acceleration of magnitude 1.2 m/s2 (same magnitude but opposite direction)? Assume that the ...
March 2, 2011

physics
A hot-air balloon of mass 200 kg is descending vertically with downward acceleration of magnitude 1.2 m/s2. How much mass (ballast) must be thrown out to give the balloon an upward acceleration of magnitude 1.2 m/s2 (same magnitude but opposite direction)? Assume that the ...
March 2, 2011

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