Astudent is swinging a ball on a string overhead in a horizontal plane. the string initially has length l0 and the ball is moving with an initial speed v0 . the student decides to see how fast they can spin the ball, so they begin moving it faster and faster with a constant tangential acceleration at. however, they know that the string is close to breaking, so they decide to keep letting the string get longer and longer in order to keep the tension in the string constant. find expressions for the length of the string and the total acceleration (magnitude and direction) as a function of time, l0, v0, and at. you may ignore the effect of gravity on the ball.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat

f is prop to m1xm2 double m1 double force