Friday

April 18, 2014

April 18, 2014

Total # Posts: 98

**physics**

At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.1 m until, at t = 1.64 s, it is traveling east. The car does not alter its speed during the turn. (a) Find the car's speed. (b) Find the change in its ...

**Magnetism**

A circular wire loop of mass M and radius R carries a current I. It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle θ does the plane of t...

**magnetis**

A metal spring can be used as a solenoid. The spring is stretched slightly, and a current is passed through it. The resulting magnetic field will cause the spring to a. collapse (shorten) b. stretch (lengthen) c. not change (nothing happens) d. ranslate along the current direc...

**magnetism**

A charged particle with charge q is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendiculuar to the same magnetic field. The time to complete one full circular revolution for the first particle is...

**PHYSICS**

work out the velocity from right hand rule. Remember what current means in terms of conventional current.

**electricity and magnets**

Think about conventional current.

**magneismt**

what statements?

**Physics**

not yet

**Physics**

So did this work out Lora?

**PHYSICS**

That seems really small.

**PHYSICS**

whats h? is that the height 10 cm?

**PHYSICS**

There are two things in life, physics and everything else is stamp collecting.

**Magnetic effect**

Use kinematic equations for 1. Then you can work out the radius. For 2 what is the equation for potential energy of a magnetic field?

**science**

You have a pulley 13.9 cm in diameter and with a mass of 1.7 kg. You get to wondering whether the pulley is uniform. That is, is the mass evenly distributed, or is it concentrated toward the center or the rim? To find out, you hang the pulley on a hook, wrap a string around it...

**Chemistry**

2 moles of helium (He) are pumped from a gas canister into a weather balloon. The balloon at this point has a volume V1. 1 mole of nitrogen gas (N2) is added at the same temperature and pressure. The volume of the balloon changes to V2. How will the new volume of the balloon c...

**AP CHEM HELP**

When NH3 is added to solid Hg2Cl2, some of the mercury ions are oxidized and some are reduced. A reaction where the same substance is both oxidized and reduced is called a disproportionation reaction. Write equations for each of these half-reactions. HELP

**algebra 1**

just like normal equations

**physical science**

two cars 200meters apart drive towards one another. If one car travels at 12 meters/s and the other at 26 meters/s how long does it take for them to collide?

**10 grade algebra**

10(x+5)=130 x+5=130/10 x+5=13 x=13-5 x=8

**Maths**

I divide exactly by 100 my first two digits are equal the sum of my four digits is 8

**Chemistry**

2.00x10^-3

**Physics**

Vector A has a magnitude of 5.00 units, vector has a magnitude of 5.00 units, and the dot product A·B has a value of 16. What is the angle between the directions of A and ?

**math**

if 400 customers come to a grand opening and every 5th customers receives a coupon for jeans and every 7th customers receives a coupon for a free sweater. how many customers will leave with both

**AP Chem**

(MnO40- + (C2O4)2- + H+ = CO2 + H2O + ? OR (MnO4)- + (C2O4)2-+ OH-=CO2 n+ H2O +? Can somebody please help me predict the products? I can balance it i just need help determining what to balance.

**Physics**

a driver sees a horse on the road and applies the brakes so hard that they lock and the car skids to a stop in 24 m. the road is level and the coefficient of kinetic friction between the tires and the road is 0.7. How fast was the car going when the brakes were applied?

**AP Chemistry**

thank you that was the only one that i couldn't get. that and number 7. im a little confused on how somebody could do that?

**AP Chemistry**

thank you that was the only one that i couldn't get. that and number 7. im a little confused on how somebody could do that?

**AP Chemistry**

The Synthesis of an Iron Oxalato Complex Salt (“Green Crystals”) In this experiment you will synthesize a compound that will contain the elements potassium, iron, carbon, hydrogen, and oxygen. Carbon and oxygen will be present in the compound as oxalate (C2O4-2) wher...

**math**

The height, h(t), of a projectile, in metres, can be modelled by the equation h(t) = 14t – 5t2, where t is the time in seconds after the projectile is released. Can the projectile ever reach a height of 9m? Explain.

**Math**

We are having an issue trying to solve for purple...

**Math**

A toy train has 20 cars- blue, purple and orange. There are 4 times as many blue cars as purple cars. There are 5 times as many orange cars as purple cars. How many of each color are there?

**maths**

Marie can afford a $250 per month car payment. She’s found a 5 year loan at 7% interest. a. How expensive of a car can she afford? b. How much total money will she pay the loan company? c. How much of that money is interest?

**maths**

How much money will I need to have at retirement so I can withdraw $60,000 a year for 20 years from an account earning 8% compounded annually? a. How much do you need in your account at the beginning b. How much total money will you pull out of the account? c. How much of that...

**maths**

You deposit $1000 each year into an account earning 8% compounded annually. a. How much will you have in the account in 10 years? b. How much total money will you put into the account? c. How much total interest will you earn?

**maths**

How much would you need to deposit in an account now in order to have $20,000 in the account in 4 years? Assume the account earns 5% interest.

**Maths**

How do yo calculate a number to the power of 2.08 i.e. not a whole number. so 4 to the power of 2.08 Thanks.

**chemistry **

The mole fraction of an aqueous solution of magnesium chlorate is 0.371. Calculate the molarity (in mol/L) of the magnesium chlorate solution, if the density of the solution is 1.39 g mL-1.

**chemistry**

calculate the pH of 20.00mL of 2.00 M HCl diluted to 0.500 L

**Chemistry**

The equilibrium constant for the reaction: 2NO(g)+Br2(g)<==>2NOBr(g) Kc=1.3x10^-2 at 1000 Kelvin Calculate Kc for: NOBr(g)<==>NO(g)+ 1/2Br2(g)

**Chemistry**

Calculate the [OH-] for a solution in which [H+] is 1000 times greater than [OH-]? and will the final result be acidic, basic, or neutral?

**Chemistry**

assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .

**AP Physics**

m1= mass of the bullet m2= mass of the block Vf=sqrt(2gh) v1= initial velocity of bullet v2= initial velocity of the block = 0 so first is conservation of momentum m1v1+m2v2=(m1+v2)Vf solve for v1 (note m2v2=0) v1=((m1+m2)/m2)/Vf to find Vf look at conservation of energy KE+PE...

**math**

thx

**math**

whats 17.50x30

**chemistry**

In the following experiment, a coffee-cup calorimeter containing 100 mL of H20 is used. The initial temperature of the calorimeter is 23.0 C . If 3.60 g of CaCl2is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of the ...

**chemistry**

the molarity of a solution composed of 25.4g KHCO3 diluted with water to a total volume of 200 mL

**chemistry**

A solution of .12 L of 0.160 M KOH is mixed with a solution of .3 L of 0.230 M NiSO4. the equation for this reaction is: 2KOH (aq)+NiSO4 (aq) ----->K2SO4 (aq)+Ni(OH)2 (s) .89 grams of Ni(OH)2 precipitate form I need to know the concentration remaining in the solution of: 1...

**Chemistry 101**

A solution of .12 L of 0.160 M KOH is mixed with a solution of .3 L of 0.230 M NiSO4. the equation for this reaction is: 2KOH (aq)+NiSO4 (aq) ----->K2SO4 (aq)+Ni(OH)2 (s) .89 grams of Ni(OH)2 precipitate form I need to know the concentration remaining in the solution of: 1)...

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 1.00 M?

**math**

Find the slope of the line passing through the points A(-4, 3) and B(4, 2)

**science**

what dose porosity mean?

**CHEMISTRY URGENT!!!**

Determine the pH (to two decimal places) of the solution that is produced by mixing 30.3 mL of 1.00×10-4 M HBr with 829 mL of 5.77×10-4 M Ca(OH)2.

**Chemistry **

A mixture containing CH3OH, HF, CH3F, and H2O, all at an initial partial pressure of 1.04 atm, is allowed to achieve equilibrium according to the equation below. At equilibrium, the partial pressure of H2O is observed to have increased by 0.43 atm. Determine Kp for this chemic...

**Chemistry **

Determine the volume (in mL) of 0.844 M hydrochloric acid (HCl) that must be added to 38.0 mL of 0.650 M sodium hydrogen phosphate (Na2HPO4) to yield a pH of 6.92. Assume the 5% approximation is valid and report your answer to 3 significant figures. Look up pKa values.

**algebra**

9x-12 = 78 (add 12 to both sides) 9x-12+12 = 78+12 (divide by 9 to isolate x) 9x=90 9x/9 = 90/9 x = 10 Check * 9(10) - 12 = 78 (9 x 10) - 12 = 78 90 - 12 = 78 78 = 78

**Chemistry **

Determine the molarity (in mol/L) of NO2− ions in solution when 9.77×101 g of sodium nitrite is added to enough water to prepare 3.94×102 mL of the solution.

**Physics II**

Jose, whose mass is 75 kg, has just completed his first bungee jump and is now bouncing up and down at the end of the cord. His oscillations have an initial amplitude of 11.0 m and a period of 4.0 s. From what height above the lowest point did Jose jump? k=185 n/m Vmax = 17 m/s

**chemistry**

The mole fraction of an aqueous solution of sodium dichromate is 0.367. Calculate the molarity (in mol/L) of the sodium dichromate solution, if the density of the solution is 1.42 g mL-1.

**Chemistry**

chemistry question. How many grams of silver sulfide can be produced by heating 45 grams of silver excess sulfer?

**physics**

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to 2.6 times her weight as she goes through the dip. If r = 20.0 m, how fast is the roller coaster ...

**physics**

a 5-kg crate is resting on a horizontal plank. the coefficient of static friction is .5 and the coefficient of kinetic friction is .4. after one end of the plank is raised so the plank makes an angle of 25 degrees with the horizontal, the force of friction is?

**3rd grade**

array for 5 times 1

**math**

we have a problem that my parents cant help with. 846*2=(...+40+...)*2=(800 over ...+...over2+6 over...)=(400+...+3)...=... ...means blank space for a number. Can you help with this problem, so that I can figure out the rest of the problems.Thanks

**5th grade**

how do you break apart to divide: 648 by 6 using compatible numbers to break apart the dividend.

**english**

what about The Story of My Life

**Music**

I need a new written add on verse of bob dylan chimes of freedom song has to be 8 lines long and the last line is An' we gazed upon the chimes of freedom flashing.

**algebra**

Its this symbol^ the computer on our webassign online doesn't recognize it so we need to replace that symbol^with a number so thats where I am lost

**algebra**

Need help showing me the steps without using the carrot function: Find the product. (2y + 2z)(2y - 3z)

**Math**

The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.

**Math**

The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.

**Gr.7 - math**

4. The dimensions of a king-size waterbed are 2.1m, 1.8m, and 23 cm. Find the volume and mass of the water it contains when full.

**7th grade**

5. What is the mass of the water? a. that fills a 1m^3 tank b. that fills a 2L bottle c. that would fill you empty classroom Thanks for your help!

**Literature**

I think your essay was good,but in the first paragraph you said "Throughout the year, the children that couldn’t afford designer clothes were made fun of constantly for their attire. Keeping up with the latest fashion trends was a must in our busy school and whoever ...

**Reading**

What is the definition of the word embers?

**science**

what is a ernmeyer flask and a granulated cylander used for?

**Friedman test: Can !?**

I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero. I will do a Friedman test for this paired data. My question: given that I have a very large number of ident...

**English**

Thanks very much Bob. I much appreciate your taking the trouble to respond. All the best! Colin

**English**

I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero. I will do a Friedman test for this paired data. My question: given that I have a very large number of ident...

**Geography**

Why is it drifting farther away

**Geography**

What is happening to the distance between Canada and europe

**Geography**

What is happening to the distance between Canada and Europe? Which plates meet near the west coast of Canada? In whihc direction are they moving?

**Geography**

Thank you

**Geography**

Name the five largest plates and on which plate Canada is located?

**10th grade**

Whatis the difference between the Hudson Bay Lowlands and the Arctic Lowlands?

**science**

potential energy is energy of _______ or chemistry?

**math**

what is the gcf of 24,32

**Physics**

a 10kg table needs to be pushed across the floor (µ=3). u stand behind it and push it at an anjgle of 30 degrees down with a force of 60N. wats the acceleration of the table?

**Algebra (word problems)**

thank u

**Algebra (word problems)**

dude i did my own effort. the problem is i dont know what im doing with these. i missed class cuz i was sick but if i can get the answers or if you would be so kind as to take the time to explain to me how to do a problem of 2 that would be great. id give u what i have but i k...

**Algebra (word problems)**

1) a small pipe can fill a tank in 16 min more time than it takes a large pipe to fill the same tank. Working together, both pipes can fill the tank in 6 min. How long would it take each pipe working alone to fill the tank? 2) a car travels 240 mi. a second car, travelling 12 ...

**Algebra**

Okay i have a few function questions im gonna post. Im completely confused with these so any help would be great. Minimum or maximum value of: f(x)=2x^2+4x+1 and f(x)=x^2-3x+2 then if f(x)=x^2+9 and g(x)=x-4, find (g*f)(-3) next is if f(x)=x^3+x^2-x-1 and g(x)=x+1, find (f/g)(...

**science**

What is the ratio of sulfur atoms to oxygen atoms in SO2?

**algebra**

simplify (numbers AFTER the variable represent exponents) ALSO these are all fractions, theres just no way to put the line x2-64 . x2-x-6 _ 1 x2-4x-12 x2+5x-24 x-6

**Algebra**

a cessna can fly at a rate of 220 mph in calm air. traveling with the wind, the cessna flew 780 mi in the same amount of time as it flew 540 mi against the wind. find the rate of the wind. how do i set this problem up? please explain in detail cuz i dont get these word problem...

**Algebra**

an amtrak trainand a car leave new york city at 2 PM and head for a town 300 miles away. the rate of the amtrak train is 1 1/2 times the rate of the car. the train arrives 2h ahead of the car, find the rate of the car

**pigskin geography**

where are the answers

**pigskin geography**

i hate pigskin geography

**Physics**

I know how to get the speed if it accelerated the whole time. How do I calculate the cruising speed? Starting from rest, a car travels 1,350 meters in 1 min. It accelerated at 1 m/s^2 until it reached its cruising speed. Then it drove the remaining distance at constant velocit...

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