Suzie (of mass 76 kg) is roller-blading down the sidewalk going 50 miles per hour. she notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 1.2 seconds. what is suzie’s average acceleration?

Acceleration,

Explanation:

Given that,

Mass of Suzie, m = 76 kg

Initial speed of Suzie, u = 50 mph = 22.35 m/s

Finally, it stops, v = 0

Time, t = 1.2 s

Let a is the Suzie’s average acceleration. It is equal to the rate of change of velocity. Its formula is given by :

So, the average acceleration of Suzie’s is and she is decelerating. Hence, this is the required solution.

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz