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# pretty_tricks

• ### Orientation of hair cells in ampulla, sacculus and utricle?

I know that in the ampulla they are all oriented in the same direction and in the sacculus and utricle they are oriented facing in different directions along the striola, but I don't understand the significance of this. I know it has to do with how they can be depolarized/hyperpolarized, but I'm hazy as to why each orientation specifically benefits each structure.

Thank you for you help!!

1 AnswerOther - Science8 years ago
• ### paralysis of touch vs paralysis of pain receptors in spinal cord?

If someone was paralyzed only in their sense of pain/temperature opposed to fine touch, what part of their spinal cord would be damaged? And what part would it be for the opposite?

http://kentsimmons.uwinnipeg.ca/cm1504/15lab42006/...

This is just the simplest image I could find, but if anyone could let me know in relation to on an image like that, it would be great. I've confused myself :S

1 AnswerInjuries8 years ago
• ### Physics Force and Kinematics?

A child insists on going sledding on a barely snow-covered hill. The child starts

from rest at the top of the 60 m long hill which is inclined at an angle of 30 degrees to

the horizontal, and arrives at the bottom 8.0 s later. What is the coefficient of

kinetic friction between the hill and the sled?

1 AnswerPhysics9 years ago
• ### Physics Force Problem?

A tiny spider is descending on a silk strand. If the strand supports it with a force of 4.4 x 10^-4 N when it is accelerating downward at 1.9 m/s , what force would the strand exert if the spider was moving downward at constant velocity?

A. 1.4 x 10^-4 N

B. 3.7 x 10^-4 N

C. 4.4 x 10^-4 N

D. 5.5 x 10^-4 N

E. 6.9 x 10^-4 N

I got the answer to be 3.7X10^-4 through using Fnet = 4.4X10^-4 - Fg to find the mass and then calculating Fg. I'm not positive if this is the right way to go about it though and I've been told that the answer is C... If someone could let me know if I'm doing this right or what I'm doing, it would be great. Thanks!

3 AnswersPhysics9 years ago
• ### Effects of adding KCl to HCN on the pH...?

If there was a 1.0L solution of 1M HCN and KCl was added (assume no volume change), how would this affect the pH?

I thought that it would decrease and HCl would be formed, but someone told me that it wouldn't affect the pH at all, and I'm confused.

Thank you!

Also, what would the affect of adding KCN to HCN be? Same situation as prior.

2 AnswersChemistry9 years ago
• ### If you double the amount of homogeneous catalyst in a reaction does the reaction rate double?

1 AnswerChemistry9 years ago
• ### Aspirin + Water + H2SO4 Reaction?

What are the products of this reaction?

And then when these products are reacted with NaHCO3, what are the products of that??

Thank you!

1 AnswerChemistry9 years ago
• ### What are acetic anhydride's functional groups?

1 AnswerChemistry9 years ago
• ### Organic Chemistry Question?

A primary amine contains a five-membered carbon ring. The degree of unsaturation for the five-membered carbon ring is equal to three. In the chemical formula, there are seven carbon atoms. Determine its chemical formula.

1 AnswerChemistry9 years ago
• ### Physics Work Problem?

A 0.211 kg shoe is dropped onto a vertically oriented spring with a spring constant of 100 N/m. The shoe becomes attached to the spring upon contact, and the spring is compressed 0.128 m before coming momentarily to rest.What work is performed by the weight of the shoe while the spring is being compressed?

Can anyone explain how to do this? I know you're supposed to integrate F for W = Fd, but I can't seem to get it to work. Thanks!

1 AnswerPhysics9 years ago
• ### Chemistry: Rank the following compounds in order of decreasing vapor pressure.?

- CH4

- CH3CH2CH2CH2OH

- CH3CH2CH2CH2CH3

- CH3CH(CH3)CH2CH3

The bracket in the last one is to represent that carbon branching off.

I know that the longest carbon chain with the strongest intermolecular forces is going to have the least tendency to evaporate, but I just can't figure it out. My brain has shut off or something.

Thank you!

1 AnswerChemistry9 years ago
• ### Chemistry: pH and pKa question?

Shikimic acid, a naturally occurring monoprotic acid, is the starting material for the

synthesis of Tamiflu, the anti-viral drug being stockpiled in preparation for an avian

flu pandemic. A 0.28 M solution of shikimic acid (20.0 mL) was treated with

sufficient 0.15 M KOH solution to reach the equivalence point. The pH of the

resulting solution was 8.73. Calculate the pKa of shikimic acid.

I've been using the Henderson-Hasselbalch equation and have been getting pKa = 8.46. The actual answer is 4.47. I have no clue how to obtain this. Any help would be greatly appreciated.

1 AnswerChemistry9 years ago
• ### What is the definition of an acid dissociation constant?

2 AnswersChemistry9 years ago
• ### Vectors orthogonal question?

Show that if v is orthogonal to both w1 and w2 then v is orthogonal to k1w1+k2w2 for all scalars k1 and k2.

1 AnswerMathematics9 years ago
• ### Corrupted File from USB?

I wrote a report and saved it to a USB stick. Now when I'm trying to open it, it says the file is corrupted, and won't let me. There's no reason for this file to have been corrupt and basically it causes me great distress that I cannot open my report. Does anyone have any ideas as to how to fix this problem? It'd be greatly appreciated.

3 AnswersOther - Computers9 years ago
• ### Chemistry Total Entropy Question?

CaO can be used as a drying agent. One such application occurs when water is added to dry concrete or cement. The reaction that occurs is

CaO(s) + H2O(l) --><--- CaOH2(s)

The product is commonly called slaked lime.

Assuming standard temperature, calculate Delta S total for this reaction using table from the table below.

Substance.....S in J/(K*mol)......Delta H f in kJ/mol

CaO (s).......39.9.................... -635.1

H2O(l).........69.9.................... -285.8

Ca(OH)2(s)..83.4.................... -986.1

Express your answer in joules per kelvin.

This is for an online assignment, and I submitted the answer -26.4, and it told me that this was incorrect, as it was the entropy change of the system, not the total entropy. How do I find total entropy?

2 AnswersChemistry9 years ago
• ### Linear Algebra: How do I find/What is lm (4e^iπ)?

1 AnswerMathematics9 years ago
• ### Why do you have to wipe the outside of a test tube before putting it into a spectrophotomter?

I know it's to get off any water or fingerprints, etc, but why exactly does this need to be done?

1 AnswerChemistry9 years ago
• ### What are factors that affect the equilibrium constant of a chemical reaction?

I know there's temperature, but what else?

1 AnswerChemistry9 years ago
• ### Equilibrium Constant Question?

In an experiment, equal volumes of 0.00200 M FeCl3 and 0.00300 M NaSCN were mixed together and reacted according to the equation:

Fe^3+(aq) + SCN^-(aq) ˂--˃ FeSCN^2+(aq)

The equilibrium concentration os FeSCN^2+(aq) was 2.70 x 10^-4 M. Calculate the equilibrium constant for the reaction.

I wasn't positive how to do this. I did it two ways, one time getting K = 45 and the other K = 57.168. If it's one of those, please let me know, and if it's something different, if you could explain/show me how to get to the response, it'd be great.

Thanks!

1 AnswerChemistry9 years ago