Lo (d) 25.0g
A body is whirled round an angular path at constant speed. Which of the following diagram correctly
indicates the direction of body's velocity (v) and acceleration (a)?
2
0
а
(a)
(b)
а у
Va
(c)
(d)
Yaros- vis
4x10 tos

  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

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up