Sarah May

I cannot, for the life of me, figure out how to find the spring constant with these givens...

A 50g mass vibrates in SHM at the end of a spring. The amplitude of the motion is 12 cm and the period is 1.70s. I found the frequency to be 0.59 Hz. How do I determine the spring constant?

Given the equation: C12H22O11 + 12O2 ---> 12CO2 + 11H2O + 5638 kJ

a) Is this reaction endothermic or exothermic?

b) If 179.2 L of O2 (STP) are consumed, how much heat is released?

c) How much heat is released during the formation of 880.0g of CO2?

4FeS2 + 11O2 -> 8SO2 + 2Fe2O3

a) How many moles of O2 are required to react with 3.5 moles of FeS2? (2 marks) b) How many grams of FeS2 are required in order to produce 10.0g. of Fe2O3?

(3 marks)

c) What mass of SO2 is produced along with 15.0g. of Fe2O3? (3 marks)

3Zn(s) + 2AlBr3(aq) ----> 3ZnBr2(aq) + 2Al(s)

a) 7.35g. of Zn and 15.0g. of AlBr3 are allowed to react. Determine the number of moles of each participant in the reaction which will be present when the reaction is complete.

b) Determine the mass of each product formed.

Given 2 Fe2O3(s) + 573 kJ ----> 4 FeO(s) + O2(g)

The DH of this reaction per mole of Fe2O3(s) used is

A. +286 J/mol.

B. -286 J/mol.

C. +573 J/mol.

D. -573 J/mol.

For the reaction;

N2H4(l) + 3 O2(g)----> 2 H2O(g) + 2NO2(g) DH = -400. kJ

the energy released when 18.4 grams of NO2(g) is produced is

A. 80.0 kJ

B. 40.0 kJ

C. 160. kJ

D. 120. kJ

For the reaction;

N2H4(l) + 3 O2(g)----> 2 H2O(g) + 2NO2(g) DH = -400. kJ

the energy released when 9.20 grams of NO2(g) is produced is

A. 80.0 kJ

B. 120. kJ

C. 160. kJ

D. 40.0 kJ

Consider the following equation;

2 NaHSO4(s) ----> Na2SO4(s) + H2O(g) + SO3(g) DH = -231.3 kJ

If 3.60 grams of NaHSO4(s) reacts, how much heat is involved?

A. 3.47 kJ

B. 427 kJ

C. 6.94 kJ

D. 13.9 kJ

with this info given...

A 100 m long steel beam is moving past earth. Observers on the earth actually measure the steel beam to be only 50 m long. how fast was the beam traveling?

i just need help rearranging the formula! i want to be able to work the equation through myself once i have the formula

I did a lab that tests whether or not movement in cold temperatures causes body heat to decrease quicker. Here is my procedure:

1. Attach a temperature probe to a metal stand.

2. Fill a blue plastic container with 0°C ice.

3. Fill a 200mL beaker with water, and heat it until it is body temperature (37°C).

4. Place the beaker into the ice-filled container, placing the temperature probe in the beaker.

5. Record the temperature at minute intervals in a data table, until approximate death by hypothermia is reached (26°C).

6. Re-fill the blue plastic container with 0°C ice.

7. Re-fill the 200mL beaker with water, and heat it until it is body temperature (37°C).

8. Place the beaker into the ice-filled container, placing the temperature probe in the beaker.

9. While consistently stirring the water inside the beaker with a stirring rod, record the temperature at minute intervals in a data table, until approximate death by hypothermia is reached (26°C).

10. Clean up your materials.

however, i am not sure what my variables would be for this?! (especially my independent variable!!)

A storage tank at 0 degrees Celsius contains 15.5 x 10^3 g of nitrogen gas (N2) at a pressure of 406 KPa. What is the volume of the tank?

please show work so i can understand how to do it

I figured out the actual number of the slope. But i need help with the units.

the units on the y axis are Energy (J) and the units on the x axis are SpeedSQUARED (m/s)

What would the units for the slope be?

I am 15 ND perfectly normal. i came home from school today and sat in a computer chair for 2 hours. i went downstairs and the left side of my body started going numb starting with my feet. i slowing regained feeling but am now having difficulty typing on my keyboard (lots of mistakes) i have been worrying myself for the past hour that i had a stroke. I had no blurred vision and only a slight headache. i was able to read and write. typing was difficult though. is this bad?

I want to become a psychiatrist so i have to take a lot of science and math courses. I plan on majoring in Psychology (while taking the required pre-med courses) and then going on to med school. i'm in grade 10 right now but i was planning out my courses for next year. would these be okay for a grade 11 or do you think it would be way too hard?

Physics 11

French 11

Pre Calculus 11

Psychology 11

Biology 11

Chemistry 11

English 11

History 11

No historic leader is purely honourable or purely inadequate. Napoleon was a charismatic leader. In other words his vision required great change in the world itself. As the ruler of France, and at one point, most of Europe, he had more power than almost any person in history. During the time he ruled, he was an inspiration of both admiration and terror. Although he was an ambitious and at times brutal general, Napoleon brought many positive changes to a lot of countries (p.94). Napoleon Bonaparte was, in no doubt, a paramount ruler. He had great control and leadership as Emperor of France, incomparable skills as a general, and created a legacy that still operates in many countries to this very day.

yes, i know they all look similar so don't bother pointing that out. thank-you :)

http://i256.photobucket.com/albums/hh199/rainbow-b...

http://i256.photobucket.com/albums/hh199/rainbow-b...

http://i256.photobucket.com/albums/hh199/rainbow-b...

http://i256.photobucket.com/albums/hh199/rainbow-b...

http://i256.photobucket.com/albums/hh199/rainbow-b...

Most people struggle with life balance simply because they haven't paid the price to decide what is really important to them.

-- Stephen Covey

The aim of life is self-development. To realize one's nature perfectly - that is what each of us is here for.

-- Oscar Wilde

The process of self-development can be described as the stripping away of layer after layer of all that is false.

-- The Daily Guru

There is only one corner of the universe you can be certain of improving, and that's your own self.

--Aldous Huxley

Submitted By Joseph P. Martino

To unlock the door to the future, you must first possess the key to the past.

this is all of my intro besides my opening sentence which is what i need help on. my essay is a persuasive essay based on the book "City of Bones" by Cassandra Clare. My topic is how the protagonist develops throughout the novel. i was looking into opening with a quote from the book but i can't find any to suit the essay :S WANNA HELP ME?

City of Bones is an enticing urban fantasy about a fifteen-year old girl named Clary Fray, whose search for her missing mother leads her into an alternate New York called Downworld, filled with mysterious faeries, hard-partying warlocks, not-what-they-seem vampires, an army of werewolves, and the demons who want to destroy it all. She also finds herself torn between two boys -- her best friend, Simon, for whom she's developing new feelings, and the mysterious demon hunter, Jace. She becomes a part of the secret world of the demon hunters, or Nephilim, and as she does she discovers that rescuing her mother might mean putting their whole world in jeopardy. To have a gratifying outcome following such perplexing events, one must overcome the conflict they are given and therefore, evolve greatly as a person.