Qa bullet of mass m=20g pierces through a plate ofmass
m1=1kg then comes to rest inside a second plate ofmass
m2=2.98kg. it is found that the two platesinitially at
rest , now move with equal velocities. find theprecentage loss in
the initial velocity of the bullet whern it isbetween m1
and m2 .neglect any loss ofmaterial of the plates due to
action of bullet.

Percentage loss is 99.5%

Solution:

As per the question:

Mass of the bullet, m = 20 g = 0.020 kg

Mass of plate,

Mass of the second plate,

Now,

To calculate the percentage loss:

By using the principle of conservation of energy:

Since, the velocity with which the bullet is fired is and then after piercing through the plates the bullet gets embed in it and hence moves with the same velocity, v as that of the plates:

= initial velocity of the bullet

v = final velocity of the combination

Thus by substituting the appropriate values in the eqn to find 'v':

Now, the loss in the velocity of the bullet:

Percentage loss = = 99.5%

  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 answer is a. the yacht traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.

im doing peak rn so sry if its wrong