Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 279

**chemistry**

calculate the molarity of the solution prepared by dissolving 16.45g NH4NO3 in water to make 250.mL solution.

**Health part 2**

Were ashworth students

**Health part 2**

Were ashworth students

**Chemistry **

The thermochemical equation for the combustion of hexane is shown below. 2 C6H14 (g) + 19 O2 (g) → 12 CO2 (g) + 14 H2O (g) ΔH° = –8326 kJ What is the enthalpy change for the combustion of 0.650 L C6H14 at STP?

**physics **

Part 1) The block in the figure is initially at rest on an inclined plane at the equilibrium position that it would have if there were no friction between the block and the plane. How much work is required to move the block 50 cm down the plane if the frictional coefficient is...

**physics**

The 4.01- kg weight that drives the time mechanism of a grandfather clock descends 21 cm in exactly 24 hours. What power is delivered to the mechanism?

**Physics **

A 50- kg child sits in a swing suspended with 3.8- m-long ropes. The swing is held aside so that the ropes make an angle of 48 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go.

**Physics**

A stone is thrown from ground level at 84 m/s. It's speed when it reaches it's highest point is 50 m/s. Find the angle, above the horizontal, of the stones initial velocity.

**Physics**

Thanks but I'm still confused about the formulas could you work it for me so I can better understand how to do it?

**Physics**

A)...If this pitch were thrown horizontally, the ball would fall .809m by the time it reached home plate, 18.3m away. The acceleration of gravity is 9.81 m/s^2 How fast was the pitch Answer in m/a B)... A spy and an official reach the edge of a 5.4m waterfall. The spy&...

**Physics**

A)...If this pitch were thrown horizontally, the ball would fall .809m by the time it reached home plate, 18.3m away. The acceleration of gravity is 9.81 m/s^2 How fast was the pitch Answer in m/a B)... A spy and an official reach the edge of a 5.4m waterfall. The spy&...

**Physics**

A)...If this pitch were thrown horizontally, the ball would fall .809m by the time it reached home plate, 18.3m away. The acceleration of gravity is 9.81 m/s^2 How fast was the pitch Answer in m/a B)... A spy and an official reach the edge of a 5.4m waterfall. The spy&...

**physics**

A 5.70 kg penguin runs onto a huge sheet of frictionless Arctic ice. At t=0 it is at x=0 and y=0 with an initial velocity of 0.35 m/s along the positive x-axis. It slides while being pushed by the wind with a force of 0.45 N directed along the positive y-axis. Calculate the ma...

**math**

1.8 + 7n = 9.5 - 4n

**math**

5(p+6) = 8p 5 (10+6) = 8(10) 5(16) = 80 80=80 p=10

**math**

5(p+6)=8p

**math**

4y-70=12y+2

**Math**

Where did the 8 come in? If x = 2 then how do you subtract 2 from 9(2) which is 18? Oh Never mind....16 = 18 got it....Thanks

**Math**

x + 16 = 9x

**math 3**

Solve the following system using the elimination method: 10x - 6y = -16 5x + 2y = 22

**math 2**

Solve the following system using the elimination method: -6x + 2y = 5 12x - 4y = -20

**math**

Solve the following system using the elimination method: -3x + 4y = 6 9x - 12y = -18

**algebra**

Solve the following system using the substitution method: 6x - 2y = -4 y = 3x + 2

**math**

Solve the following system using the substitution method: 2x + 4y = 5 x = -2y + 6

**math**

Solve the following system using the substitution method: y = 3x - 9 y = -x - 1

**algebra**

Solve the following system using the substitution method: 3x + y = -3 y = 2x + 7

**Math**

316x3^3 316x9 =2,844in^3

**Math**

The volume of a cone is 316in^3. What is the volume of a similar cone that is larger by a scale of 3?

**Math**

The surface area of a bucket is 6,176cm^2. What is the surface area of a similar bucket that is smaller by a scale of 1/4?

**Math**

The surface area of a cylinder is about 218 in^2. What is the surface area of a smaller cylinder that is smaller by a scale factor of 1/2?

**Math**

12d-9=15d+9

**pre-algebra**

what is the mode for this set of numbers97,86,93,56,34,39,47,62,88,54,81

**Math**

in a class of 40 the ratio of boys to girls is 7 to 3. How many more boys than girls are in the class?

**phsicsy**

a liquid with density of 1.36*10^3 kg/m^3 through two horizontal sections of round tubing joined end to end. in first section, diameter of the tubing is 10cm and the flow speed is 230cm/s and the pressure is 1.3*10^5, the diameter is 6 cm a the cross sectional area in each tub...

**math**

angle ABC and DEF are supplementary angles. the measure of DEF is 20 degrees less than 3 times the amount of ABC. what are ABC and DEF.

**Pre-AP Physics**

A flatbed truck is carrying a heavy crate. The coefficient of static friction between the crate and the bed of the truck is 0.47. What is the maximum rate at which the driver can slow and avoid having the crate slide against the cab of the truck?

**Q&A Check Please, geo 7th grade**

I'm going to have to go with Ms. Sue, I've been through Geography and I believe if you look through your book you could find the answer... easily.

**math**

f(24)=1/2(24)+5 f(24)=12+5 f(24)=17

**math**

f(24)=1/2(24)+5

**math**

Juan drives to work. Because of traffic conditions, he averages 22 miles per hour. He returns home averaging 32 miles per hour. The total travel time is 2 1/4 hours. Define a variable for the time Juan takes to travel to work. Write an expression for the time Juan takes to ret...

**Math**

a jet leaves the Charlotte, North Carolina, airport traveling at an average rate of 564 km/h. Another jet leaves the airport one half hour later traveling 722 km/h in the same direction. How long will the second jet take to overtake the first?

**sociology **

what can occur when a social norm is dysfunctional?

**Chemistry**

How would you prepare a 25.0% water in ethyl alcohol solution using 100.0 ml of ethyl alcohol (The density of ethyl alcohol is 0.7893 g/ml)

**Chemistry**

Describe in detail a way of preparing 500 ml of solution that is 0.02500 M in sodium ions. Start with solid sodium sulfate decahydrate.

**math**

joe wants his sticker collections. he wants to increase his collection by 20%. if he has 1400 stickersin his collection now, ho many stickers does he need to add to his collection?

**Physics**

The electric potential energy of an object at point A is known to be 60 J. If it is released from rest at A, it gains 20 J of kinetic energy as it moves to point B. What is its potential energy at B?

**Physics**

The nucleus of a certain type of uranium atom contains 92 protons and 143 neutrons. What is the total charge of the nucleus in Coulombs?

**PHYSICS**

What is the longest wavelength that can be heard by a normal ear?

**Chemistry**

Mg + 2HCl -> MgCl2 +H2 delta H = ? MgO + 2HCl (aq) -> MgCl2+ H2O delta H = ? H2+ 1/2O2 -> H2O delta H = -285.8 kJ Using Hess' Law find both the missing delta H values.

**Physics**

A 0.31 kg pendulum bob passes through the lowest part of its path at a speed of 2.02 m/s. The acceleration of gravity is 9.8 m/s2 . What is the tension in the pendulum cable at this point if the pendulum is 72 cm long? Answer in units of N

**Chemistry**

What is the mole fraction of each component of a gas mixture that contains sulfur trioxide at a pressure of 1.45 atm and sulfur dioxide at a pressure of 0.32 atms?

**physics**

A roller coaster moves 200 ft horizontally and then rises 135 ft at an angle of 30 degrees above the horizontal. Next, it travels 135 ft at an angle of 40 degrees below the horizontal. Find the roller coasters displacement from its starting point to the end of this movement. A...

**physics**

Abel flicks a 20g marble at a speed of 0.5 m/s. It has one dimensional collision with a 10g bouncy ball, that was initially at rest. After they collide, the bouncy balls speed is 0.5 m/s. What is the marbles post-collision speed? Show whether or not any kinetic energy lost dur...

**Physics**

Abel flicks a 20g marble at a speed of 0.5 m/s. It has one dimensional collision with a 10g bouncy ball, that was initially at rest. After they collide, the bouncy balls speed is 0.5 m/s. What is the marbles post-collision speed? Show whether or not any kinetic energy lost dur...

**Chemistry**

A chemist wants to make a solution of 3.4 M HCl. There are two solutions of HCL that he can find on the shelf. One has a concentration of 6.0 M, while the other has a concentration of 2.0 M. Which solution can the chemist use to make the desired acid?

**physics**

A small mailbag is released from a helicopter that is rising steadily at 2 m/sec. a) how long does it take the mailbag to stop moving? b) how high will the mailbag have risen in the time found in part a? c) how far did the helicopter move in the time found in part a?

**Algerbra 1 substitution method**

2x+y=3 x+2y=0

**Algerbra 1 substitution method**

2x+y=3 x+2y=0

**PHYSICS**

You have 300 g of coffee at 55 degrees celcius. Coffee has the same specific heat as water. How much 10 degrees celcius water do you need to add in order to reduce the coffee's temperature to a more bearable 49 degrees celcius?

**Physics**

You have 300 g of coffee at 55 degrees celcius. Coffee has the same specific heat as water. How much 10 degrees celcius water do you need to add in order to reduce the coffee's temperature to a more bearable 49 degrees celcius?

**Physics**

You have 300 g of coffee at 55 degrees celcius. Coffee has the same specific heat as water. How much 10 degrees celcius water do you need to add in order to reduce the coffee's temperature to a more bearable 49 degrees celcius?

**Physics**

You have 300 g of coffee at 55 degrees celcius. Coffee has the same specific heat as water. How much 10 degrees celcius water do you need to add in order to reduce the coffee's temperature to a more bearable 49 degrees celcius?

**Physics**

You have 300 g of coffee at 55 degrees celcius. Coffee has the same specific heat as water. How much 10 degrees celcius water do you need to add in order to reduce the coffee's temperature to a more bearable 40 degrees celcius?

**physics**

a mover uses a ramp to pull a 1000 newton cart up to the floor of his truck 0.8 meters high if it takes a force or 200 newtons to pull the cart what is the length of the ramp

**Algebra HELP**

Change the exponentional expression to an equivalent expression involving a logarithm. (2x)^-10=4

**Functions, domain,range etc**

Determine the domain,range and horizontal asymptote of f(x)=(3/2)^(4-x). Graph the function

**Functions of f(x)**

this question wants you to make up the functions of f(x) and g(x) to proform each expression

**Logarithms**

suppose to be SQRT7

**math**

if the radius is 24 ft. what is the circumference?

**Chem**

what is the Net Ionic equation for: 1. MgCl2+NaOH-> 2. MgSO4+Sr(NO3)2->

**math**

about what percent of the total population believe saying the early bird catches the worm to be true 136,800,000 believed this to be true

**Physics **

The head of a hammer is loose and you wish to tighten it by banging it against the top of a workbench. Why is it better to hold the hammer with the handle down, as shown below, rather than with the head down? Explain in terms of inertia.

**Physics **

The head of a hammer is loose and you wish to tighten it by banging it against the top of a workbench. Why is it better to hold the hammer with the handle down, as shown below, rather than with the head down? Explain in terms of inertia.

**Physics**

Thank you for the reply but I have a picture drawn... Still lost. I'm looking for equations to use. Thanks!

**Physics**

2. A golf ball is hit off the tee with an initial speed of 32 m/s at an angle of 29° with respect to the horizontal. a. What is the maximum height the ball reaches? b. What is the speed of the ball when it reaches the highest point? (give magnitude and direction) c. Where ...

**Physics**

3.A car with a mass of 1500 kg is parked on a hill with an incline of 20°. a.What is the weight of the car? b.What is the normal force the car experiences? (hint: balance the forces parallel and perpendicular to the hill using Newton’s second law) c.What is the magnit...

**Physics**

5.A crate with a mass of 100kg accelerates with a magnitude of 2.0 m/s2 when it is pushed with a 250N. a.What is magnitude of the force of friction opposing this motion? b.What is the normal force of the crate? c.Using a and b, find the coefficient of friction. d.If the crate ...

**Biology**

What kind of animals have eggs that contain yolk? Do all eggs have yolk?

**statistics**

I've got to do a project in my math statistics unit. Surveying people on a resturant. How do I do a draft on poster paper?

**language arts **

I need an example of a simile,and metaphor for tue book Sammy keyes and the hotel theift

**Chemistry**

Does water or chloride ion bond more strongly to the cobalt(II) ion?

**math**

Find the area of a rhombus with a perimeter of 20 meters and a diagonal of 8 meters

**chemistry**

Does water or chloride ion bond more strongly to the cobalt(II) ion?

**Geometry **

Find the area of a rhombus with a perimeter of 20 meters and a diagonal of 8 meters

**chemistry**

Does water or chloride ion bond more strongly to the cobalt(II) ion?

**science**

The more _______ (organisms,water) a land ecosystem has, the greater the diversity of life it has.

**7th grade math**

Sally makes an ice cream sundae. She can choose from vanilla, chocolate, or strawberry ice cream, fudge or caramel topping, and sprinkles or nuts. Write an expression to show how to find all the different combinations. I'm not sure how to do this. Any help would be appreci...

**7th grade math**

If the theoretical probability of rolling a 3 is 1/6, what is the experimental probability of rolling a 3 if the cube is rolled 300 times? Need a formula to show answer.

**7th grade math**

Sally makes an ice cream sundae. She can choose from vanilla, chocolate, or strawberry ice cream, fudge or caramel topping, and sprinkles or nuts. Write an expression to show how to find all the different combinations. I'm not sure how to do this. Any help would be appreci...

**mrs. sue**

it has to be a really short story. We have to memorize it. Thanks

**reading**

Does anyone know of a good short story that has to due with confidence or dedication? If so do you know the website where i can read the story? Thanks

**math**

it is b correct

**math**

what fraction of a week is 7 seconds A) 1/24 B)1/1440 C) 1/3600 D) 1/86400

**math**

if today is tuesday and i first bent over backwords 563 days ago, then on which day did I first bend over backwords? sat,wed, tues or friday?

**math please help**

multiplying a number by 6/4 is the same as dividing it by? is it 3/2 or 4/3

**helper**

can you plese help me with the math question I just posted about how to write out the inequality?

**helper**

can you help with math question just posted by me?

**math**

you have 3 hours to do your homework. you spend 45 min on math. you want to divide the time remaining equally along 4 subjects. write and solve the inequality to find the # of minutes you can spend on each subject. I know the answer is 33.75 but can you tell me how to write th...

**math please help**

what is the solution of 3-8x = 141? -18 -12 1/18 18

**mrs sue **

is the answer for the soccer golie question B?