A. You ride your bike along a straight road for a distance d at a constant speed of 13.0 mi/hr and then for another distance 2d along the same straight road at a different constant speed. The average speed for the total trip is 15.0 mi/hr. Determine your constant speed during the second part of the trip. b. Suppose you start the trip by riding in the wrong direction (with the same constant speed as above for the first part of the trip) and after traveling a distance d (in the wrong direction) you realize your mistake. If you then ride to the correct destination with a constant speed, what must this speed be in order for the time for the total trip tb for case (b) to be 1.60ta, where ta is the time for the total trip in part (a). (Enter your answer to at least one decimal place.)

i think it is non rem sleep

  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