Posts by savannah

Total # Posts: 270

chemistry
The air within a piston equipped with a cylinder absorbs 570J of heat and expands from an initial volume of 0.12L to a final volume of 0.88L against an external pressure of 1.0 atm. What is the change in internal energy of the air within the piston?

chemistry
18.02g*4.18J/g*C*-3.9=-293.76204 -293.76204/1.25=-235.009632 -235.009632*80.6=-18941.77634J/mol -18941.77634J/mol=-18.94177634kJ/mol

chemistry
i tried using that formula and keep getting it wrong but i don't know why.

chemistry
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH_4NO_3(s) rightarrow NH_4...

chemistry
what is Ccal?

chemistry
When 0.558g of biphenyl (C_12H_10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.7^\circ C to 30.1^\circ C. Find DeltaE_rxn for the combustion of biphenyl in kJ/mol biphenyl. The heat capacity of the bomb calorimeter, determined in a separate ...

chemistry
The air within a piston equipped with a cylinder absorbs 570J of heat and expands from an initial volume of 0.12L to a final volume of 0.88L against an external pressure of 1.0 atm. What is the change in internal energy of the air within the piston?

chemistry
How much heat is necessary to change a 52.0 g sample of water at 33 degrees celsius into steam at 110 degrees celsius?

Chemistry
The total mass that can be lifted by a balloon is given by the difference between the mass of air displaced by the balloon and the mass of the gas inside the balloon. Consider a hot air balloon that approximates a sphere 5.00 m in diameter and contains air heated to 65 C. The ...

Chemistry
The total mass that can be lifted by a balloon is given by the difference between the mass of air displaced by the balloon and the mass of the gas inside the balloon. Consider a hot air balloon that approximates a sphere 5.00 m in diameter and contains air heated to 65 C. The ...

Physics
You are in a boat that is traveling across a river from east to west at 4.0 m/s. the river runs north at 3.0 m/s. what is the resultant velocity of the boat?

Physics
A 0.05 kg paper drag racer is launched at a speed of 33 m/s. If the launcher is 4.8 kg, at what speed does the launcher move in the opposite direction?

Physics
What is the magnitude of the electric field 0.3 m from a 10-4 C point charge?

social studies
apalachee

All are correct! 10/10

actually i got #12 its 6/3 = 70/h 6 x h = 3 x 70 6h = 210 6 ÷ 6 = 210 ÷ 6 h = 35

physics
Two particles moving along parallel paths in the same direction pass the same point at the same time. Particle A has an initial velocity of 8.7 m/s and an acceleration of 1.2 m/s^2 Particle B has an initial velocity of 4.3 m/s and an acceleration of 7.7 m/s^2 At what time will...

Physics
9)A car, moving along a straight stretch of highway, begins to accelerate at 0.0153 m/s 2 . It takes the car 29.2 s to cover 1 km. How fast was the car going when it ﬁrst began to accelerate? Answer in units of m/s

Physics
A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Initially a car is 41 m behind the train, traveling in the same direction as the train at 39 m/s and accelerating at 4 m/s 2 . What is the speed of the car just as it passes the train? Answer...

4. only one-celled organisms. 5. Lysosomes; digestive chemicals the rest are right

Jimmy gave 10 cupcakes to his best friend Bob. Bob ate 3. How many did Jimmy have left? 10 - 3 = 7 So, Jimmy has 7 cupcakes left over.

Physics
Joyce and Efua are skating. Joyce pushes Efua, whose mass is 40 kg, with a force of 16 N. The force of friction between Efua's skates and the ice is 2 N. What is the magnitude of the net force exerted by Joyce on Efua?

I got a 100 from Mo

Physical science
A hot iron ball is dropped into 200g of cooler water. The water temperature increases by 2.0 degrees C and the temperature of the ball decreases by18.6 degrees C. What is the mass of the iron ball?

algebra
the houston texans sell styrofoam fingers to make a profit. Profit made from styrofoam fingers sales is function of numbers sold. Which of the following is the independent quantity in this function?

algebra
Which linear equation represents the statement "the quotient of 17 and y is 9 less than four times x"?

Physics
The acceleration of gravity at the surface of a newly discovered planet is 5.2 m/s^2. An astronaut throws a rock straight up at 10.5 m/s on this planet. How high will it go? Please help!!!

Physics
If a ball has an initial downward speed of 24 m/s, how far does the ball drop during the 4 s to 5 s interval

Physics
A ball is dropped from rest off a 34 m building. How long does it take to hit the ground at the bottom of the building?

Math
Oh I typed it wrong!! Haha

Math
More specific @Miss.Sue?

Math
Unit rate Driving 180 miles for 18 people? I think its 60 ? Am I right?

Math
Unit rate 160 words typed in 4 minutes?

math
HELP?! Unit rate for 54 hotdogs for 18 people? Show work so I can understand thanks!

Math
1)The break-even point is the ticket price for which the event's income will equal expenses. Another way to think of the break even point is the ticket price when profit is \$0. The equations given in an earlier problem were: P=((4000-25X)x)-7500 I=((4000-25x)x) S=4000-25x ...

math
7 & 11 are both prime numbers between 6 & 15. 7*11=77

Disability Insurance. In 1954, Congress made full disability (the physical or mental inability to work) part of the Social Security Act. If a worker qualifies for social security and becomes totally disabled, he or she can receive the same benefits as a person retiring at 65. ...

trig
(-10√2, -10√2), find te magnitude and direction angle of the vector, measure the direction angle in [0, 360). Please help!

Physics
-34.3 J and 45.93m/s

Algebra
The area of a circle is given by the formula A+pier^2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100pie square inches, what is the radius of the original circle?

Chemistry
A solution of NaOH with pH 13.68 requires 35.00 mL of 0.128 M HClO_4_ to reach the equivalence point. How do you calculate [Na^+^] and [ClO_4_^-^] at the aquicalence point? (volumes are additive)

Chemistry
How do you get the pH 13.68 into OH^-^?

chemistry
How do I do convert the pH to the OH?

chemistry
A solution of NaOH with pH 13.68 requires 35.00 mL of 0.128 M HClO_4_ to reach the equivalence point. What is the volume of the NaOH solution?

Math:Ratios
This is 6th Grade math by the way.

Math:Ratios
The Ratios for students who have a computer to those who do not are 22;8 while the ratio for the ratio of students who have a cell phone to those who do not is 12;18. Which is greater?

math
At one tennis match, there were about 6000 people.about 40% more people attended the second match than the first match about how many people were at both games?

math
if two triangles are similar, what can you say about the ratios of the two side lengths within one triangle and the ratios of the corresponding side lengths in the other triangle? HELP ASAP!! THANK YOU TO WHOEVER HELPS!!

Marketing
Can you give me an example of a product and its marketing mix? By marketing mix, I am referring to the 4 P’s of Marketing- Price, Product, Place and Promotion For example like Yoplait, but I am not sure how the company uses the 4 P’s

math
At a given time, the height of an object is directly proportional to the length of the shadow that is cast on the ground. A person 6 feet tall casts a shadow 1 foot long at noon. a) What is the length of the shadow cast by a flagpole known to be 20 feet tall? b) A tree cast a ...

*The light from stars travels a long way.*

Calculus AB
Ugh the pi symbol didn't work. All of the ð should be pi. so it would be a(t) = picos(pit) and my answer should be sin(pit) + C

Calculus AB
A particle is moving along the x-axis so that at time t its acceleration is a(t)=ðcos(ðt) At time t=1/2, the velocity v of the particle is 1/2. Find the velocity of the particle at any time t. I think I got that right, as sinðt + C. Now it wants the minimum ...

Trigonometry
Oh that makes sense. That 2sin^2x + 13sinx - 7 can be factored. Thanks!

Trigonometry
2cos^2(x) = 13sinx - 5 How do i solve for x? I think i have to use the sin^2x + cos^2x = 1, but I'm not sure how to use that. I thought about maybe doing 2(1-sin^2x) = 13sinx - 5 but then i get stuck. Any suggestions?

Physics
Lai threw a ball downwards with an initial velocity of 11.0 m/s. What is in meters the displacement of the ball during the 2.9 seconds after she threw it? (don't include units in the answer, use 10.0 m/s2 for g and use the upward direction as positive)

Calculus AB
Nevermind I think I figured it out. I can just leave k in there and solve for it later.

Calculus AB
The rate of growth dP/dt of a population of bacteria is proportional to the square root of t, where p is the population size and t is the time in days (0<equal t <equal 10). That is, dp/dt = ksqrt(t). The initial size of the population is 500. After 1 day the population ...

3×9=27

Calculus AB
Find a, b, c, and d such that the cubic function ax^3 + bx^2 + cx + d satisfies the given conditions Relative maximum: (2,4) Relative minimum: (4,2) Inflection point: (3,3) So this is what I have so far: f'(x) = 3a^2 + 2bx + c f''(x) = 6ax + 2b f(2) = a(8) + b(4...

math
This is going to involve trig functions. you have the angle, and if you draw a triangle and fill in the numbers, you'll see that the length of the slide is the hypoteneuse of this triangle. You are looking for the height of the triangle, which is the side opposite of the ...

Happiness
80%

chemistry

chemistry
well how do you work them out?

chemistry
are this 2 equations the same NIE? and if not how come? Write a net ionic equation for the reaction that occurs when aqueous solutions of ammonia and acetic acid are combined. Write a net ionic equation for the reaction that occurs when aqueous solutions of acetic acid and ...

chemistry
well it said it was wrong the way it was done on the other one

chemistry
Write a net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and perchloric acid are combined.

cheistry
Write a net ionic equation for the overall reaction that occurs when aqueous solutions of hydrosulfuric acid and potassium hydroxide are combined. Assume excess base.

Chem
Does any solid PbCl2 form when 3.1 mg NaCl is dissolved in 0.228 L of 0.12 M Pb(NO3)2. Find the Qsp.

College Chemisrty
Molarity is moles/Liter. First you need to convert 140g to moles. After you do that, you divide your answer by .400L to get your molarity.

Math
0 = 5+2(3+4x) Subtract 5 from both sides -5 = 2(3+4x) Distribute the 2 -5 = 2(3) + 2(4x) Simplify -5 = 6 + 8x Subtract 6 from both sides -11 = 8x Divide both sides by 8. -11/8 = x y = 5-2(3+4x) 0 = 5-2(3+4x) -5 = -2(3+4x) -5 = -6 - 8x 1 = -8x -1/8 = x Now you try the last one

physics
Two objects with masses of 3.00 kg and 7.00 kg are connected by a light string that passes over a frictionless pulley (a) Determine the tension in the string. .N (b) Determine the magnitude of the acceleration of each mass. .m/s2 (c) Determine the distance each mass will move ...

physics
A woman at an airport is towing her 21.0 kg suitcase at constant speed by pulling on the strap at an angle of è above the horizontal (Fig. P4.40). She pulls on the strap with a 34.0 N force, and the friction force on the suitcase is 11.0 N. (a) What angle does the strap...

physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 10.6 m/s. Five seconds later, its speed is 6.10 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...

Chemistry
What is the element oxidized and the element reduced in the equation: HAsO2 + 2 Ag+ + 2 H2O 2 Ag + H3AsO4 + 2 H+

Physics
A boat moves through the water with two forces acting on it. One is a 1500 N forward push by the motor, and the other is an 1400 N resistive force due to the water. (a) What is the acceleration of the 1100 kg boat? m/s 2 (b) If it starts from rest, how far will it move in 7.0 ...

science
jason weighs 10kg. the force of gravity is 9.8 m/s2. what is the amount of force jason is applying to the ground when standing?

science
jason weighs 10kg. the force of gravity is 9.8 m/s2. what is the amount of force jason is applying to the ground when standing?

Math story problem
83,8.30,8.00,0800

chemistry
The radius of a barium atom is 217 pm. How many barium atoms would have to be laid side by side to span a distance of 4.33 mm?

chemistry
The mass of a single silver atom is 1.79E-22 grams. How many silver atoms would there be in 112 milligrams of silver?

physics
The figure below shows a general situation in which a stream of people attempt to escape through an exit door that turns out to be locked. The people move toward the door at speed v = 4.1 m/s, are each d = 0.30 m in depth, and are separated by L = 1.75 m. The arrangement in ...

geometry
GIVEN THE NOTATION BELOW PLACE = OR =WITH SQUIGGLY LINE OVER IT IN THE BLANK TO SHOW THE CORRECT SYMBOL THAT SHOULD BE USED. EX. XY___AB

Accounting
What is the maturity value of a 120-day, 4 % note for \$ 18,000

English 3
I already read this book, twice, and i loved it. Steinbeck creates an unsettling/calm atmosphere. Almost as if everything is TOO peaceful.

Math
Whole Number Math Riddle Clue 1: Double my tens digit and get my ones digit. Clue 2: Double me and I am less than 50

Physics
The normal force and the centripetal *force need to equal eachother if the car is to remain grounded, so N=mV^2/r or mg=mV^2/r and then the masses cancel and we have g=V^2/r or v^2=gr.

math
when you work out the problems you end up with aviseman which i am pretty sure means a vice man

physics
You are driving a car with a power output of 56,000 Watts. How many seconds will it take to go from 0 m/s to 27 m/s?

finding perimeters
tell the dimensions and perimeters : 9 square inches

Which of the following would be the MOST useful strategy for learning to communicate effectively with international employees working in your overseas divisions? a) Devote time to learning the rules for communicating with people from each of the countries you will be ...

Crystal agreed to serve on a company’s advisory board and now has to contact them to say she cannot attend a scheduled meeting where she was to be one of the several key speakers. What should she do? a) Let the company know she cannot attend and that they will have to ...

science math social studies

math
which is greater and less than <>

Math
What kind of graph is two circles put together called?

mrs.stewart is my tacher

contemporary Math
If there are 2 red disks numbered 1 through 2, and 6 yellow disks numbered 3 through 8, find the probability of selecting a red disk, givent that an odd-numbered disk is selected?

I need help!!!!

Algebra 1
how do i work out the equation S= B + 1/2Pl solving for l

English
How does the Scarlet letter A affect Hester Prynne's personality and her thinking concerning the position of women in society?

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