Jen is conducting an experiment involving a device known as a pith ball electroscope

the plastic ball hangs in mid air and is uncharged. charges cannot move alone the silk thread that holds the ball in the air.

jen completes the following steps in her experiment:
1. she collects three identical, uncharged rubber tubes.
2. she holds a magnet to the first tube for five mins
3. she submerges the second tube in a tank of water for 5 mins
4. she rubs the third tube with animal fur for 5 mins
jens teacher tells her that she can use the pith ball electroscope to see if any of the rubber tubes are surrounded by an electric field. what should jen do to test for an electric field surrounding each tube.

a, connect the three tubes to each other and see if they attract the plastic ball
b, hold the magnet in direct contact with the tube that was submerged in water
c, bring each tube close to the plastic ball and note any movement of the ball
b, bring the magnet close to the plastic ball and note the motion of the ball toward the magnet

  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 total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

the components of a vector are the parts of the vectors that are to each other.

b perpendicular