Natash

A 0.132kg baseball is dropped from rest. If the magnitude of the baseball's momentum is 0.811kg m/s just before it lands on the ground, from what height was it dropped? Calculate velocity from momentum. Then, knowing velocity at impact calculate height fr...

18 years ago

Why are titanium and gallium not very similar while lithium and sodium would be most similar ?

17 years ago

anaerobic respiration is triggered when the ratio of ________falls below a critical level. a.carbon dioxide supply to oxygen need b.oxygen supply to glucose need c.glucose supply to glucose need d.oxygen supply to oxygen need the electron transport chain...

17 years ago

How many oxygen atoms are in 1.90g og quartz (SiO2)? ok so 1.90g SiO2(1mol/60.0843g SiO2)(2 O mols/1 mol SiO2) (6.022*10^23atoms/1mol) what am i doing wrongg???

17 years ago

If 17.0g of MgSO4*7H2O is thoroughly heated,what mass of anhydrous magnesium sulfate will remain ? I don't even know where to begin on this one

17 years ago

what drug that is used as a treatment for asthma, promotes bronchodilation by selectively stimulating beta2-adrenergic receptors? A.singular B.albuterol c.Terbutaline d.epinephrine i think its between b and c

16 years ago

Blood flow is increased by a.hypotension b.anemia c.vasoconstriction d.edema I don't see how any of these can be the answer

16 years ago

Hypotension could be induced by a.excessive renin secretion b.excessive antidiuretic hormone secretion c.excessive aldosterone secretion d.excessive atrial natriuretic factor secretion

16 years ago

the primary drive to breath is elicited by which of he following: a.reduced PO2 b.reduced PCO2 c.increased PO2 d.increased PCO2

16 years ago

dizziness during hyperventilation is due to a decrease in cerebral blood flow. The decreased blood flow is caused by a. vasodilation b. decreased stroke volume c.vasoconstriction d. decreased respriation

16 years ago

Pulmonary fibrosis may be caused by a.smoking b.allergic reactions c.breathing in coal dust. d.increased mucus production I'm having trouble with this because doing research I found it to be smoking and breathing in coal dust. So I'm a bit confused.

16 years ago

Give exact answers Sin(11pi/8) so this is sin(pi/4+pi/3) sin(pi/4)*cos(pi/3)+cos(pi/3)*sin(pi/4) rad2/2*1/2+1/2*rad2/2 which gives me rad2+rad2 all over 4 ...i don't know y im getting it wrong

16 years ago

simplify and write the trigonometric equation in terms of sine and cosine. tan^2x-sec^2x

16 years ago

Use an addition or subtraction formula to write the expression as a trigonometric function of one number: tan75degrees-tan15degrees/1+tan75tan15=tanAdegrees =square root B Its asking for the value of A and B. I know A =60 degrees, what I can't figure out...

16 years ago

Find all solutions of the equation 2sin^2x-cosx=1 in the interval [0,2pi) x1= ? x2=? x3=?

16 years ago

solve the following equation in the interval [0,2pi]. Give the answer as a multiple of pi. Do not use decimal numbers (sin(t))^2=3/4

16 years ago

Prove that cos4x=8cos^4x-8cos^2x+1 so I'm guessing you begin with the left side cos4x=cos2(2x) then im kinda lost

16 years ago

what is the orbital diagram for Au+, how do you fit the f orbitals in?

16 years ago

order the elements Mg, K, Ca, S according to second ionization energy I know that K would have the highest second ionization energy, then come S bec it takes more energy to remove an electron from a nonmetal than a metal, which is next ?

16 years ago

what is the appropriate hybridization for the carbon atom in CO2? the explanation I was given is 2 electron groups around the center atom carbon suggest sp hybridization. the 2 unhibridized p orbitals on carbon form the 2 pi bonds. My question is why pi b...

16 years ago

Rank the following compounds in order of decreasing boiling point: KCI CO2 CH2O

16 years ago

Find cosq and sinq if the terminal side of q lies along the line y = - 2 x in quadrant IV.

16 years ago

Ghrelin is postulated to ba a satiety factor. True or False. I think its false, but im not sure

16 years ago

why are sig. figs important?

16 years ago

Consider the following reaction: 2N2O(g)--->2N2(g) + O2(g) a. express the rate of the reaction with respect to each of the reactants and products. b.In the first 10.0 s of the reaction, .018 mol of O2 is produced in a reaction vessel with a volume of .250...

16 years ago

Okay so Im doing a lab on preparation of K3[Fe(C2O4)3]*3H2O The final weight I got 2.835g. How can I find the theoretical yield of this? What do I need?

16 years ago

A reaction has deltaHrxn=-127 kJ and delta S rxn=314 J/K. At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings? so I made delta H-T delta S=0 plugged in values for S and H and solved for T. I go...

16 years ago

By trial and error with your calculator, find the angle theta for which sin theta and theta differ by 5%. This calculation must be done in radians. When you have found theta, express it in degrees. plzzz help thanx

16 years ago

suppose that there are two components, A and B, in a mixture. The chemical affinity of A for the stationary pahse is less than that of B and the chemical affinity of A for the mobile phase is greater than that of B. If the mixture is subjected to paper ch...

16 years ago

so we did this lab on chromatography, and in the beaker was 10 mL of HCI and 35 mL of acetone. IF the distilled water used to prepare the HCI solution in this experiment passed through iron pipes, then the HCI will be contaminated with FeCl3. Examine your...

16 years ago

the pH of a .100 M solution of sodium formate = 8.37. Calculate the value of Ka of formic acid. okay so I know that the anion of a weak acid is itself a weak base so A- +H2O---> OH- + HA pOH =14-8.37 so conc of OH is 10^-5.63 Ka=[OH][HA]/[A-] so we know t...

16 years ago

the Ksp of CaF2 = 1.46*10^-10 and Ka of HF = 3.5*10^-4 Calculate the pH of a solution in which the solubility of CaF2 = .0100 moles/liter. so Ksp =[Ca2+][F-]^2 and Ka =[H3O+][F-]/[HF] I'm not sure how to continue...

16 years ago

why does a soluble impurity reduce the melting point range of a pure compound ? why is it advisable to run a mixed melting point determination on samples of two different compositions before concluding that the two compounds are identical ?

16 years ago

Discuss 5 major conflict between management and shareholders that can affect the performance of firm.

3 years ago

distribute the 5 first m+5m-5=7 6m-5=7 6m=12 m=2

17 years ago

thats what I did, but it's giving me a wrong answer

16 years ago

Yes...work backwords to check your answer

16 years ago

sorry I'm a bit confused. These are the solutions we had to prepare a. 10g of ferrous ammonium sulfate dissolved in 30mL of water containing 2 drops of 6M H2SO4. Which I got 8.87g b. 6g of oxalic acid in 50mL of water. I got 4.4008g c. 6.6 g of K2C2O4*H2O...

16 years ago

yes Fe(NH4)2(SO4)2 is the ferrous ammonium sulfate. here is the procedure, if you can try to figure it out that'll be great thank you! 1. prepare and label the following solutions: a.10g of ferrous ammonium sulfate dissolved in 30mL of water containing 2...

16 years ago

I know that part, but why are the conc. of OH and HA the same ?

16 years ago

OHHHH got it, without the ICE chart I sort of get confused. Thanx!

16 years ago