Astudent solving a physics problem for the velocity of an object has applied appropriate physics principles and obtained the expression v=dt−v0, where d=35.0meter, t=9.00second, and v0=3.00meter/second. what is the velocity v?

Answer : 312 meters/second.

Explanation : As the given expression is v=dt−v0;

where v is to be found and rest all values are given;

d is 35 meters

t is 9 seconds

and v0 is 3 seconds

So, when we substitute these values in the equation we get,

v = (35 meters X 9 seconds) - 3 seconds

v = 312

therefore, velocity v will be equal to 312.

  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

so easy. just google the electromagnetic waves and it’ll pop up.