Questions asked by Fleur

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• Romeo is at #x = 0 m# at #t = 0 s# when he sees Juliet at #x = 6 m#... ?
  
• A sidewalk is to be constructed around a pool that measures #(10.0+-0.1) m# by #(17.0+-0.1) m#. If the sidewalk is to measure #(1.00+-0.01) m# wide by #(9.0+-0.1) cm# thick, what volume of concrete is needed and what is its approximate uncertainty?
  
• A #"0.4596 g"# sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as #"AgCl"# by the addition of an excess of silver nitrate. The mass of the resulting #"AgCl"# is found to be #"0.6326 g"#...?
  
• Ball #A# is dropped from rest from a building of height #H# exactly when ball #B# is thrown up vertically. When they collide #A# has double the speed of #B#. If the collision occurs at height #h# what is #h/H#?
  
• Why does chromium form a #"Cr"^(2+)# ion?
  
• The vector #vec A# is on a coordinate plane. The plane is then rotated counterclockwise by #phi#. How do I find the components of #vec A# in terms of the components of #vec A# once the plane is rotated?
  
• Why is pressure always negative in the formula #w = -P DeltaV#?
  
• Eliminate the parameter to find a Cartesian equation for #x = sin^2 t# and #y=2cost#?
  
• Differentiate #s=(1+sint)/(1+tant)# using the quotient rule?
  
• Evaluate #sin^4 15^@ + cos^4 15^@#?
  
• If #sin x + cos x = 1.2#, then #sin x - cos x# can be written in the form #+-sqrtA#. What is #A#?
  
• Determine the magnitude of a ball's radial acceleration?
  
• A person standing at the top of a hemispherical rock of radius R kicks a ball (initially at rest on the top of the rock) to give it horizontal velocity #v_i#. What must be its minimum initial speed if the ball is never to hit the rock after it is kicked?
  
• Three beakers each contain #"100 mL"# of acidic solution with a #"pH"# of #3.00#. The acids in the beakers are #"HCl"#, #"HNO"_2#, and #"HI"#. If #"50 mL"# of #"0.1 M NaOH"# is added to each beaker, which resulting solution will have the lowest #"pH"#?
  
• Find the change in #"pH"# that occurs when #"0.010 mol NaOH"# is added to #"1.0 L"# of a buffered solution containing #"0.50 M"# acetic acid and #"0.50 M"# sodium acetate?
  
• The gravitational force exerted on a baseball is #-F_ghatj#. A pitcher throws the ball, initially at rest, with velocity #v hat i# by uniformly accelerating it along a horizontal line for a time interval of #t#. What force does he exert on the ball?
  
• 50.0 mL of 0.10 M acetic acid is titrated with 10.0 mL of 0.10 M NaOH. What's the pH of the solution?