# martina

Newest questions and responses by martina
1. ## Science

Angle of refractions! I need help finding angle of incidence in air(or water or glass) it is for one of my labs. It iOS in a data table though.

2. ## Science

what weight of NaCl is needed to prepare 200mls of a 250ppm Na solution?

3. ## Physics

Two soccer players, Mary and Jane, begin running from nearly the same point at the same time. Mary runs in an easterly direction at 3.61 m/s, while Jane takes off in a direction 63.3o north of east at 5.44 m/s. How long is it before they are 23.6 m

4. ## Physics

Starting from the constant-acceleration kinematic equations, write a formula that gives vf in terms of t, xi, xf, and a. Starting from the constant-acceleration kinematic equations, write a formula that gives t in terms of xi, xf, vi, and vf.

5. ## Math

Explain how to use hundredths grids to subtract 1.65 - 0.98.

6. ## chemistry

a compound contains 5.2% by mass Nitrogen. It also contains carbon, hydrogen and oxygen. Combustion of 0.085g of the compound produced 0.224g of carbon dioxide and 0.0372g of water. Calculate the empirical formula of the compound.

7. ## STATS

Suppose a researcher observed from the analyses carried out the F-values 4.41 and 1.11. Which of the two cases are likely averages not come from the same population (ie, differences not statistically significant); a) none of the above b) 1.11 c) 4.41

8. ## STATS

A statistically significant F value means that: a) The influence of the independent variable is less than the error b) he observed differences between groups are due to individual differences of the values and the error c) An effect of the independent

9. ## STATS

The error calculated by ANOVA includes: a) The variation due to experimental error b)The variation due to the influence of third variables c)The variation due to the influence of individual differences between the values d) a, b and c

10. ## chemistry

balance: CaCl2 + AgNO3 → AgCl + Ca(NO3)2

11. ## chemistry

which of the following is not spontaneous process at 25 degrees celsius and 1 atm pressure? ice melting iron rusting salt dissolving steam condensing water boiling

12. ## sewing

when plannin a one piece facing for the armhole of a sleeless dress, the grain line of the facing should be taken from the

13. ## sewing

What lenght of material with the jacket sleeve in Ms Ms Troy

14. ## Chemistry

A 10.0-mL solution of 0.30 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 30.0 mL d) 40.0 mL

15. ## Chemistry

A solution is made by mixing exactly 500 mL of 0.178 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.

16. ## AP Physics

A long, straight wire carries a current of 740 mA. A thin metal rod 45 cm long is oriented perpendicular to the wire and moves with a speed of 1.8 m/s in a direction parallel to the wire. What are the size and direction of the emf induced in the rod if the

SUFFIXES: -dairy=dairies -ability=abilities -cry=cries -journey=journies -liberty=liberties -dictionary=dictionaries -worry=worries -cherry=cherries -lady=ladies -supply=supplies -lazy=lazyness -penney=pennies

One day, a person went to horse racing area, Instead of counting the number of human and horses, he instead counted 74 heads and 196 legs. Yet he knew the number of humans and horses there. How did he do it, and how many humans and horses are there?

19. ## science

what is the difference between water on the surfaace of crystals and hydrate water itself?

20. ## Calc

A rectangular storage container with an open top is to have a volume of 15m^3. The length of the base is twice the width of the base. Material for the base costs \$6 per square meter. Material for the sides costs \$7 per square meter. Find the cost of the

1. ## Math

Thank you for the help

posted on January 11, 2018
2. ## Science

working not really clear. can you please explain further.

posted on October 8, 2016
3. ## Life orientation

plz help us with homework

posted on May 27, 2015
4. ## STATS

Thank you both of you... And I agree with you... Because it it depends on the dfs so is tricky to connect the higher p-value with higher probability for significance whithout knowing the dfs.

posted on October 5, 2013
5. ## STATS

Agree with you... Thank you so much!

posted on October 5, 2013
6. ## STATS

I agree with you.. I support it.. Thank you!!

posted on October 5, 2013
7. ## STATS

Thank you mathGuru... I believe the same but there is a confusion with the word "suppose".... It doesnt ask which is..It says to suppose.. which from the two given values has the higher possibility to not be statistically significant.. Do you stil support

posted on October 5, 2013
8. ## Science Help! I have a deadline!!

this is pretty simple...if you have the time to put this on here..use google to answer this

posted on January 7, 2013
9. ## Chemistry

I don't even know where to start. There is no volume for HCl and am not sure how the equation is suppose to look like. I'm just confused about this problem.

posted on May 2, 2011
10. ## Chemistry

yes 7.11E-10 was the right answer thank you very much for the help :)

posted on May 2, 2011
11. ## Chemistry

I calculated all of them and this is what I got: 1) [H+] = 2.56x10^-13 M 2) [OH-] = .039 M 3) [Na+] .089 M 4) [CH3COO-] = .05 5) [CH3COOH] = 0 All of them were right except number 5 and I don't know what the answer to number 5 is suppose to be.

posted on May 2, 2011

well i am sorry i know i did a bad thing and i am sorry damon well this might help u the flow of matter and energy is more than one thing it doesn't have one exact definition and i am sorry ms sue

posted on April 16, 2010