Arrow 1 is dropped straight down at while Arrow 2 is fired horizontally with an initial speed of 20 m/s. Both are initially at a height of 45 meters above the ground. 1. Which arrow (ball) will hit the ground first? Why? Predict:
Arrow 1
EXAMPLE – Horizontal Projectiles
00
45 meters
Actual:
Arrow 2
20 m/s
vf v0 at
xx vt1at2
2
2. What do you know about the horizontal direction? The vertical direction? How does that help simplify the equations above?
3. How long will it take arrow 1 to strike the ground?
4. How long will it take for arrow 2 to strike the ground? Look familiar?? Why?
5. What is the velocity of arrow 1 just as it hits the ground?
6. What is the resultant velocity of arrow 2 just as it hits the ground?
7. What will be the horizontal distance traveled by arrow 2?

  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

we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide