The current, 2019, women's world record for the 400-meter run around an oval track is held by Marita Koch, with a time of 47.60 seconds. What was her average speed during this race

v = 8.403 m/s

Explanation:

Given that,

The current, 2019, women's world record for the 400-meter run around an oval track is held by Marita Koch, with a time of 47.60 seconds.

Average speed, v = d/t

d = 400 m

t = 47.6 s

So,

Hence, her average speed during the race is 8.403 m/s.

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explanation:

he went to the supermarket with your dad

  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