# Posts by Allie

Total # Posts: 410

**chemistry**

If i have .0030M BaSO4 how do I calculate the moles of sulfate?

**Math**

160 hours per hour

**physics**

a plane needs to fly at 40 degrees n of e when flying through a wind that blows 80 mph @ 70 degrees S of E. If the plane goes 320 mph in still air in what direction should the plane aim?

**Physics**

A stone is dropped from the top of a well. If the well is 23.1 meters deep, how long with the stone take to reach the bottom?

**Physics**

An object with a mass of 3kg is dropped from 56.3 meters. How far above the ground is it's kinetic energy 1073J?

**physics**

A metal sphere of radius 5.00 cm is initially uncharged. How many electrons would have to be placed on the sphere to produce an electric field of magnitude 1.59 105 N/C at a point 7.98 cm from the center of the sphere?

**AP Chem**

how many milliliters of 0.10 M HCl must be added to 50.0 mL of 0.40 HCl to give a final solution that has a molarity of 0.25 M?

**Math**

4% x 60month x 2000= 4800 I am really struggling with this problem.

**Math**

What would the rate of return be on an Individual Retirement Account with a contribution of $2000.00, at 4% Interest rate, for 5 years?

**math algebra**

what are 4 consecutive integers whos sum is -2

**English (Mrs,Sue!!)**

Mrs.Sue, I wrote a paper on research proposal. Now, my teacher is asking us to write the steps on how we wrtoe the paper. Can you reword these questions for me? thank you so much!! "What techniques did you use as you thought through the issue? " "What prewriting...

**Ms.Susy Please Help With Time!!!!!!**

the answer is 5:30 hours

**physics**

+y| / F | / | / | / /a_ _ _ _ _ +x 40N This is pretty much what the picture looks like. Your answer was incorrect!

**physics**

"Only two forces act on an object (mass = 3.90 kg), as in the drawing. (F = 76.0 N.) Find the magnitude and direction (relative to the x axis) of the acceleration of the object. " (The angle is 45 degrees and the horizontal force is 40N)

**physics**

"Only two forces act on an object (mass = 3.90 kg), as in the drawing. (F = 76.0 N.) Find the magnitude and direction (relative to the x axis) of the acceleration of the object. " (The angle is 45 degrees and the horizontal force is 40N)

**Math**

Is my answer correct then??

**Math**

Thank you!!

**Math**

R varies jointly as S and the square of T. If R is 32.4 when S=0.2 and T=9, find R when S=0.5 and T=5. I believe the answer is R=25, could someone check this for me?

**Math**

for his new room Daren will need 154 feet sq of wall to wall to cover of his new square room. what is the length of each wall of his room?

**statistics**

How do you find standard deviation?

**Physics**

a 25 kg box is released from rest on a rough inclined plane tilted at an angle of 33.5 degrees to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200. a. determine the force of kinetic friction acting on the box b. determine the ...

**Chemistry**

Yes it does. Thanks.

**Chemistry**

my work: 243.228= 18.0153 * 4.184* (Tfinal-Tinitial) 1825.228=75.376Tfinal Tfinal= 24.2149 I got this answer and it is incorrect. can u please help me? and confirm the right answer. thanks :)

**Chemistry**

I have this same question on my hw and it is marking me wrong. Can someone please say what the right answer is or confirm it?

**Chemistry**

I still don't get how to do it. I did what you said and it keeps marking me incorrect :(

**Chemistry**

No this is a different person. Thanks I got it.

**Chemistry**

At constant pressure, which of these systems do work on the surroundings? Check all that apply. 2A (g) + B(s) --> 3C(g) 2A (g) +2B (g) -->5C(g) A(g)+ B(g) --> C(g) A (s) +2B(g)--> C(g)

**Chemistry**

For a 5.0 g sample of CoCl3·9H2O, what weight of water (in grams) will be lost if the sample is heated to constant weight (all water driven off)?

**Film Literature**

What was the first comedy movie ever made?

**math**

at a local community college, it costs 150 to enroll in a morning section of an algebra course. Supopose that the varible n stands for the number of students who enroll. then 150n stands for the total amount of money collected for this course. how much is collected if 41 ...

**9th gradae physical science**

teh density of copper is 8.92 g/cm3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?

**Intro to Psychology 1**

A behaviorist is asked to evaluate five students in the second grade who exhibt impluse control problems.The behaviorist decides it is best initially to study them in the classroom without interferring with the behavior.This behaviorist is conducting _____ research. A.) survey...

**Biology**

ok thank you!

**Biology**

yes i had read this previously, i guess im just not sure how to apply this to the question. any suggestions?

**Biology**

can anyone tell me a little about MacArthur and Wilson's theory of island biogeography? I need to answer the question Describe a series of small habitats that exist within 10 to 20 kilometers of your house and which might be subject to MacArthur and Wilson's theory of ...

**biology**

If im thinking correctly Aristotle paired things with similar characteristics. I would do some quick research on him before answering but I would go with D.

**math**

number of people who hear a rumor after t hours is N(t) = 2000/ 1 + 499e^-0.3t How long will it take for 200 people to hear the rumor?

**Physics**

Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 75 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 690 kcal have been burned at the end of the workout, what efficiency is the machine using in...

**Physics**

Sweating is one of the main mechanisms with which the body dissipates heat. Sweat evaporates with a latent heat of 2430 kJ/kg at body temperature, and the body can produce as much as 1.3 kg of sweat per hour. If sweating were the only heat dissipation mechanism, what would be ...

**Physics**

An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 670 K. If the initial pressure is 8.00 104 Pa. (a) Find the work done on the gas. Answer is in J (b) Find the thermal energy transfer Q. Answer is in J

**Math**

The answer is no solution, unless ur teacher says it has one. I had ethe same problem and its no solution. Hope this helps

**Finance**

For the first time in a very long time (perhaps ever!), the concept of financial risk and risk management has become a topic of concern at Presidential press conferences. Such concern has centered on esoteric financial products such as derivatives that are used to manage risk...

**science**

what change of state happens when a gas loses energy?

**bio**

what is the cisternal maturation hypothesis for Golgi apparatus function?

**bio**

how does the explosive polymerization of G-actin propels L. monocytogenes through the cytoplasm?

**bio**

what is a mechanism for how EB1 can mediate the extension of ER cisternae along microtubules?

**Spanish- SraJMcGin please recheck**

Thank you

**Spanish- SraJMcGin please recheck**

I think it does-so I was okay when I used mejor que in my sentence? I wasn't suppose to change anything??

**Spanish- SraJMcGin please recheck**

I'm not sure what you meant by correcting this sentence--Thank you for any further explanation you can give-- 3. Tocar el piano es______tocar la guitarra. (+bueno) Tocar el piano es mejor que tocar la guitarra. You said in an earlier post: mejor que(irregular - or ...

**Spanish**

For number ten and eleven above I think I put the wrong answer. To place verb in present progressive it would be: 10.Yo escucho it would be Yo estoy escuchando, correct? 11. nosotros hablamos would be Nosotros estamos hablando, correct? Thank you

**Spanish**

Please check these- Fill in comarative form for the first three: 1.Surfear es ____ interesante (cazar.) Surfear es más divertido que cazar. 2.El fútbol es ____ el golf.(interesante) El fútbol es más interesante que el golf. 3. Tocar el piano ...

**Algebra-Please check**

For the ellipse (x-2)^2/49 + (y+1)^2/25=1 List center: (2,-1) the foci: -(sqrt 74) AND +(SQRT 74,0) Major axis: x=2 Minor axis: y= -1 Vertices: (7,0) (-7,0) (0,5) (0,-5) Is this correct?

**Physics**

A ball has a diameter of 3.70 cm and average density of 0.0841 g/cm3. What force is required to hold it completely submerged under water? I need to find the magnitude in N Thank you!

**Physics**

(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 23.2 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa. Pa (b) What force is exerted by the water on the window of an underwater vehicle at ...

**physics**

Four objects are held in position at the corners of a rectangle by light rods . m1 2.90(kg) m2 1.90(kg) m3 4.50(kg) m41.90 (kg) (a) Find the moment of inertia of the system about the x-axis. Answer in kg · m2 (b) Find the moment of inertia of the system about the y-axis...

**Economics**

can you help me brain storm? I want some points on why Per Capita GDP might be a bad way to compare wellbeing across countries.

**Chemistry 105**

(729-Pw) =?

**history**

I don't understand what is meant when a question asks you for the "term" Historical significance. for example:john maynard keynes. I know everything about him and his economic ideas but, if i was asked to write a short paragraph of his historical significance i ...

**critical thinking**

technical jargon used by people in the same field can be an acceptable used of language. true of false.

**Physics***

A student sits on a rotating stool holding two 3.2-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and...

**Physics***

A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 575 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5,000 rev/min. (a) Find the kinetic ...

**Physics***

A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 70.0-gram mass is attached at the 16.0-cm mark, the fulcrum must be moved to the 39.2-cm mark for balance. What is the mass of the meter stick? Answer in grams

**social studies**

name two helpful developments in georgia and the rest of the country that occurred after the Revolutionary War

**Physics**

The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.70 m and 0.99 m, respectively. The respective rotational speeds are 454 rev/min and 4,147 rev/min. Calculate the speeds of the tips of both rotors. main rotor =180.6625215m/s tail rotor ______m/...

**Physics**

A dentist's drill starts from rest. After 3.30 s of constant angular acceleration it turns at a rate of 2.1x10^4 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. rad

**Physics**

A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 7.0-kg object at the origin of the coordinate system, a 8.0-kg object at (0, 2.0), and a 17.0-kg object at (4.0, 0). Find the resultant ...

**Physics**

A satellite has a mass of 99 kg and is located at 1.97 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? Answer in J (b) What is the magnitude of the gravitational force on the satellite? Answer in N

**Physics**

A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10−16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10−11 N. At how many revolutions per second should the centrifuge be ...

**Physics**

A 54.9-kg ice skater is moving at 4.09 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.803 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. Answer in N (b) ...

**Physics**

A dentist's drill starts from rest. After 3.30 s of constant angular acceleration it turns at a rate of 2.1 104 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. rad

**critical thinking (just explain the question plz)**

can u explain this question for me or rephrase it because i don't understand what it means by fact-based subject matter or value-based subject matter. Does your hypothesis test fact-based subject matter or value-based subject matter? Briefly explain.?

**Physics**

A 2.4 kg object attached to a horizontal string moves with constant speed in a circle of radius R on a frictionless horizontal surface. The kinetic energy of the object is 95 J and the tension in the string is 315 N. Find R.

**Physics**

A 79.0-kg fullback running east with a speed of 4.00 m/s is tackled by a 93.0-kg opponent running north with a speed of 3.00 m/s. (a) Why does the tackle constitute a perfectly inelastic collision? (b) Calculate the velocity of the players immediately after the tackle. ...

**Physics**

Question Part Points Submissions Used A 45.0-kg girl is standing on a 160-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.44 m/s to the right...

**Physics**

The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 22.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average force on the ...

**Physics**

A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0037 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 2.7 102 ft/s, find the average force ...

**critical thinking please help**

True or false: It is the case that if an argument is inductively correct then the conclusion is factually correct as well

**cell bio**

Sketch a transition phase diagram with two curves; one for C18:0 and a second for C18.1. Label X and Y. Add a third curve for what you might predict would happen if a nonionic detergent like Triton X-100 were present in the C18:0 preparation

**cell bio**

NTP hydrolysis is used in two ways to drive directionality of the targeting and translocation phases of secretion. What are the principles of these two mechanisms?

**Calculus**

f'= 2x+5 F'(1) is 7

**Chemistry**

I'm adding NaOH

**Chemistry**

Calculate the volume of 2 M acetic acid needed to prepare 50 ml of 0.1 M acetate buffer.

**Physics**

When a 3.00-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.07 cm. (a) What is the force constant of the spring? N/m (b) If the 3.00-kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on ...

**economics please help**

Use the supply and demand model to explain what happens to the equilibrium price and the equilibrium quantity for frozen yogurt in the following cases. d.There is a sudden increase in the price of milk. im confused with this one.

**economics**

Can you please exlain to me if I'm wrong not just correct me. ps. Ceteris paribusor the following markets, show whether change causes a shift in supply curve, a shift in demand curve, a movement along the supply curve, and/or a movement along the demand curve. a.housing ...

**Math**

(1/25)^1/2 i know the answer is 0.02 but how do you find it in a fraction without using a calc?

**Math, Please Help!!!**

Foil.

**organic chemistry**

b,e,g

**physics**

A eye pupil of 1 cm diameter can resolve about what angle in radians? First of all I don't understand what they mean by resolve. Resolve the light coming into the eye?

**physics**

the equation that I think I need is P = P0 + ρgh where P is 1 atm and P0 is 1/3 atm but I get a height of 3.06 x10^-4 meters which seems like a vvery small amount

**physics**

suppose you were able to blow air out of your mouth at one third of an atmosphere pressure. How tall a column of water could your mouth air pressure push up a straw? I know atm pressure is 1 atm but I'm really confused about how to go about this problem. thanks!

**math/physics**

The ratio of the mass of your body (50 kg) to a dollar bill(1 gram) is? body: 50 kg= 50,000 g 50000/1 so the ratio is 50,000? (That seems like too much to me)

**Physics**

Clap your hands and estimate the energy and power released as sound waves. I know Kinetic energy= 1/2*m*v^2 and Power is KE/t but how do I find the velocity of the sound wave made from clapping my hands? and for the mass do I use the mass of my hands? thanks

**mat**

harvest cereal comes in boxes of different sizes.the regular box holds 7/8 pounds.the small box holds 2/3 as much. How much cereal does the small box hold?

**physics**

A skier of mass 72 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 65 m up a 30° slope (assumed frictionless) at a constant speed of 2.7 m/s? (b) What power must a motor have to perform this task?

**chemistry**

What is my theoretical yield of iron II chloride if I start with 34 grams of iron II bromide?

**physics**

Find the height from which you would have to drop a ball so that it would have a speed of 6.6 m/s just before it hits the ground.

**physics**

A projectile is launched with a speed of 41 m/s at an angle of 55° above the horizontal. Use conservation of energy to find the maximum height reached by the projectile during its flight.

**physics**

A sledge loaded with bricks has a total mass of 18.9 kg and is pulled at constant speed by a rope inclined at 19.3° above the horizontal. The sledge moves a distance of 19.8 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0...

**physics**

A child and sled with a combined mass of 50.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 3.40 m/s at the bottom, what is the height of the hill?