Picture attached! use the following picture to answer questions #17 and #18. consider that after the snowboarder starts down from the hill from point a, she travels all the way to the end of the path. 17. standing still at the top of the hill at point a, what kind of energy (potential and/or kinetic) would the snowboarder have? how do you know? 18. explain the energy conversion from point c to point b. make sure to include a description of both kinetic and potential energy.

17. At point A, the snowboarder has potential energy

Explanation:

There are two types of energy involved here:

- Gravitational potential energy: this is the energy related to the height of the snowboarder, and it is given by , where m is the mass of the snowboarder, g is the gravitational acceleration and h is the height of the snowboarder relative to the ground

- Kinetic energy: this is the energy related to the motion of the snowboarder, and it is given by , where v is the speed of the snowboarder

We see that at point A the snowboarder is located at a higher point, so h is larger, therefore he has gravitational potential energy.

18. From point C to point B, kinetic energy is converted into potential energy

Explanation:

The law of conservation of energy states that the mechanical energy (sum of potential and kinetic energy: ) is constant. At point C, the snowboarder is located at height h=0, so he only has kinetic energy (in fact, its speed is maximum at point C). As he moves towards point B, he increases his height: therefore, its potential energy increases, while his kinetic energy decreases (this implies that his speed decreases as well). Therefore, kinetic energy is converted into potential energy.

  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