An angry mob lynches a phsical teacher after receiving their grades. they throw the physics teacher off a tall building . they throw the physics teacher straight down with a velocity of 20m/s. the teacher falls for 30 seconds before landing on a stack of empty card board boxes . how high was he thrown from?

5010 m

Explanation:

The vertical position of the teacher at time t can be found by using the equation:

where

h is the initial height

is the initial velocity (negative since it's downward)

is the acceleration of gravity

t is the time

The teacher reaches the ground when y = 0, so the equation becomes

Substituting t = 30 s, we find the initial height:

  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

truck y has a greater velocity than truck x.