# Posts by tom

Total # Posts: 1,423

**Chem Lab Help- Check Urgent**

We had acid base and solid mixture in this experiment. other than these we aren't given anything else. Yes it was an extraction.

**Chem Lab Help- Check Urgent**

Separation of Unknown Compounds ( this is a lab question. we used ether in this experiment)

**Chem Lab Help- Check Urgent**

Suggest another solvent you might use instead of ether. Explain your choice giving the advantages and disadvantages of your choice. I said: Toluene Advantages are: -the vapor pressure of Toluene is less -the freezing point is much lower -low polarity -immiscible in water ...

**Physics Help Please!!!!**

A car is at rest on a horizontal road. What is the value of the frictional force? Explain your answer. A bison stands at rest on the horizontal ground. What is the value of the frictional force? Explain. The normal force always has a direction perpendicular to the surface that...

**Chem Help Please!**

You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!

**Chem Lab Help**

You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!

**Engineering Calc.**

Water is leaking out of an inverted conical tank at a rate of 6700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...

**Intro Physics - Newton's third rule**

a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!

**Chem Lab Help**

Separation and purification A mixture of benzoic acid, benzaldehyde and butylamine. What kind of experiment should you design to obtain each of the three compounds in a pure state. Just need ideas in order to start this experimental design. Thanks!!!

**Calculus**

let F(x) = f(2x) and suppose that the derivative of F(x) = x^(2). Find the derivative of f(2x).

**Calculus**

Thanks!

**Calculus**

So here is the question: Find and equation of the tangent line to the graph: 4)f(x)=e^(2x) passing through the point (0,0) I find derivative being f'(x) =2e^(2x) Then m = f'(0) = 2 put into point slope formula: (y-y1)=m(x-x1) y-0 = 2(x-0) which comes out to y=2x 0=2x...

**Calculus**

I have y = sin^2(3^(x)) which I rewrite as y = (sin(3^(x)))^2 I got the derivative using the chain rule as the following y' = 3(sin(3^x))^2 (cos(3x)) (3^(x)(ln(3)) Can anyone confirm whether this is right/wrong? Thanks

**statistics**

The police department of a major city has found that the average height of their 1,250 officers is 71 inches (μ = 71 in.) with σ = 2.3 inches.

**statistics**

c. The top 10% of the officers in terms of height also make higher salaries than the shorter officers. How tall does an officer have to be to get in that top 10% group? (I.e. what is the height marking off the top 10 percent?)

**Physics**

An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photo-electrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?

**Physics**

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?

**Physics**

An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?

**Physics**

White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star? help please don't know what to do

**Math**

Pay attention in class

**science**

YOU COULD HAVE INFORMED ME OF THAT AN HOUR EARLIER!

**science**

Wow, you make me stay here for nearly an hour to wait for you to answer a question. Thanks. By the way, don't say how you didn't know the answer, you could have informed me of that 50min earlier.

**science**

a student brings in a piece of moldy bread. which microscope would you use to view the mold? why?

**science**

a student brings in a piece of moldy bread. which microscope would you use to view the mold? why?

**Physics**

How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?

**science**

Ok not necessarily you but other tutors.

**science**

Ok but you could of said something instead of leaving me hanging waiting for you to answer.

**science**

what the heck ms.sue you literally skipped over my question. i've been next to my computer screen waiting for you to answer my question.

**science**

if the paramecium overheats, what could happen to the metabolism

**Maths**

The first one iswhat angle does a 3.8m ladder make with the ground, if it reaches 2.1m up the wall? The second one is A concreter uses a ramp to wheelbarrow in sand from the ground level to floor level inside a building under construction. Floor level is 75cm above ground ...

**Computer**

Each of the following is a typical feature of a fee-based internet back up service EXCEPT ______. backup to external hard drive universal access file feedback information delayed deletion

**living enviromentn**

graduated cylinder why numbers going up on one side and down on the other side

**living environment**

1) the prefix milli- means 1/1,000. how many times would you have to fill and empty a 10 ml graduated cylinder in order to fill a 1 liter soda bottle? i put 100 times. 2) what are eight examples of liquid products sold by volume

**living environment**

the small spaces which represent millimeters count 9 spaces. i'm not talking about the spaces which represent centimeters

**living environment**

how many small spaces are marked off within 1 centimeter i know 10mm= 1 cm but when i literally count the small spaces, there are nine of them

**economics**

Hello, I am currently busy writing an essay and run against a wall: If government decreases the corporate tax rate, what would be the short-run and long-run effect on the aggregate supply, aggregate demand and Long-run aggregate supply in terms of shifts. (AS-AD Model) Would ...

**living enviroment**

thank you so much

**living enviroment**

never leave the fire on the stop unattended wash your hands after dealing with bacteria or anything dirty if there is broken glass don't pick it up with your bare hands always wear cooking mittens while dealing with hot objects

**living enviroment**

write 8 ways you could apply science safety rules in your kitchen at home.

**science/math (mean)**

Find the mean Sample Value 1- 41.93 2- 12.55 3- 48.07 4- 90.81 5- 18.45 6- 55.81 I came up with 44.60 the online program "said close but check to see if yo made a round error" and at least three decimal places

**chemistry**

Show calculations for how you will prepare 250 mL of 0.1 M AgNO3 solution from solid AgNO3 and water Give the reagent amounts and units.

**Chemistry**

The piperazine content of an impure commercial material can be determined by precipitating and weighing the diacetate: (C2H4)2N2H2 + 2 CH3COOH → (C2H4)2N2H2(CH3COOH)2 In one experiment, 0.3126 gram of the sample was dissolved in 25 mL of acetone, and 1 mL of acetic acid...

**Chemistry**

A 8.5 L sample is collected at 45 degrees C. What will the volume be if the temperature is raised to 70 degrees C.

**Math**

48

**Resume Writing**

How would I say that using a resume word?

**Resume Writing**

Hello. I am creating a resume. Under one of my bullet points, I want to say that I write inspirational blogs. How would I say that in the resume way?

**Math**

Thank you so much Ms.Sue! :D

**Math**

what is the sum of a profit 0f $8000 and a loss of $13000? I'm realy struggling and need URGENT Help! plz respond

**Chemistry**

A 56 g sample of peanut oil has a volume of 60.9 cm^3. Calculate the density of the peanut oil.

**Algebra**

Solve equation. -6e^8n+8 -3=-23

**algebra**

23

**physics**

A sound wave of frequency 1310 Hz., propagating through air at 0 degrees Celsius, has a pressure amplitude of 11.0 Pa. What is the maximum particle speed (in meters/second)?

**pharmacy**

the structural formula of a drug is included in this section of a drug monograph

**english**

I expect a friend to both honest and a loyal pereson

**english**

I want to either study or to work abroad after I graduate.

**Physics**

Explanation of twin paradox in regards to special relativity theory.

**math**

Suppose that inflation is 3% per year. This means that the cost of an item increases by 3% each year. Suppose a jacket cost $150 in 2011. How long will it take for the jacket to cost $300 dollars?

**math 1 question!!!!!!**

No its 14/27. Multiply 2/3 and 7/9.

**math**

I put both systems of equations into the y=mx+b format.

**math**

yes thank you!!!!!!!

**math**

x – 3y = 25 x – 2y = 21 find the x and y values i think x=-13 and y=4 am i right?

**algebra 2**

In how many ways can 6 toy animals be arranged in a line on a shelf if one of the toys is a tortoise and it must be at the end of the line?

**Physics**

A pendulum consists of a swinging mass hanging from a massless string. The hanging mass is 2.0 kg and the string is 400.0 cm long. If the mass has a speed of 8.0 m/s when it passes the lowest point of its swing, a) what is the speed when the string makes an angle of 60.0o with...

**Calculus**

Let t be some ﬁxed real number. Find the volume of the region bounded by y =1/x and the y = 0 on the interval [1, t] rotated about the x-axis. What happens as t → ∞?

**Help me? Thanks~**

hurry

**Help me? Thanks~**

22. The joints highlighted in the image below are ______________ joints. image of transparent body with the spine highlighted can you help me with this question

**Chemistry**

A student places a zinc electrode in a 0.80 M Zn2+(aq) solution which is connected by an electrolyte to a 1.30 M Ag+ (aq) solution containing a silver electrode. (Note that the solution concentrations are not standard). Determine the initial voltage of the cell at 298 K. Show ...

**Physics**

A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up the ramp before it ...

**Physics**

A block is sitting on a rough ramp. It is found that a force of F = 200.0 N (directed up the ramp) is required to keep the box from sliding back down the ramp. The angle 𝜃 is 35.0o and the mass of the box is 150.0 kg. What is the coefficient of static friction between...

**algebra**

solve the system of equation 2x+y=5 y^2-2y=-3x+5

**algebra**

solve each system of equations 1.4x-0.5y=1.3 0.4x+1.1y=4.1

**algebra**

assuming the distance between points (2,-3) and (-1,y) is 5 units, find y. how do you set this up?

**English/Mythology**

that is what I wanted to know the "meaning"

**English/Mythology**

What is a ritualistic interpretation of the story of Theseus

**English/Mythology**

What is ironic about the death of Jason and Theseus from Greek mythology

**Math**

The temperature of an object in a experiment is T(t) = 60(1/3)^t + 10, where T is the temperature in degrees C and t is time in seconds. What is the domain and range of this situation?

**english**

why am i black? please explain that to me.

**health sciences**

Explain the changes that occur in the DNA of muscle fibers during exercise?

**science**

how strenuous should the exercise be in order to metabolize sugar and fat in the body?

**Thank You**

Thank you sooo much Writeacher

**Language Check**

are the rest of them correct? besides 8 and 10

**Language Check**

1.has 2.are 3.show 4.were 5.play 6.is 7.use 8.requires 9.enjoy 10.turn Hope im right

**Language Check**

Choosing verbs that agree in Number with Their Subjects: 1. Almost everybody (has,have) played games that originated in faraway places. MY ANSWER: HAVE 2. Few of these games (is,are) difficult to play. MY ANSWER: ARE 3. Pictures on ancient Greek pottery (show,shows) people ...

**Question**

how would you get 3. if the answer was 2/3

**Language HELP**

Proofreading a Parapgraph for Subject-Verb Agreement, Help with the errors: 1.Oridnary houses or a public building sometimes present problems for people with disabilities. 2. For example, a person using a wheelchair or crutches often have difficulty maneuvering in narrow halls...

**criminal justice**

the study of moral standards and how they affect conduct

**criminal justice**

I am still confused on what they have in common.

**criminal justice**

how are Ethical Egoism and Virtue Ethics the same and what are the contradictory elements between the two systems

**calculus help**

Does the function satisfy the hypotheses of the Mean Value Theorem on the given interval? f(x)= ln(x) , [1,6] If it satisfies the hypotheses, find all numbers c that satisfy the conclusion of the Mean Value Theorem. (Enter your answers as a comma-separated list. If it does not...

**college Algebra**

A rectangular fence is to be built along a river using the river as one side of the fence.the cost of the fencing for the two ends is $8 per sq ft and the cost of the fencing for the side running parallel to the river is $12 per sq ft. If you have $3600 to spend on purchasing ...

**math**

Water flows through a pipe with the inner diameter of 20cm at a speed of 1m/s. How long does it take for the water flowing out from the pipe to fill a cylindrical tank with the base radius of 0.8m and the height of 0.5m?

**Math**

Alex's favorite restaurant is a buffet-style Chinese restaurant downtown. Each time he goes, he chooses 2 appetizers and 1 entree. If the restaurant has four appetizers and 5 entrees to choose from, how many, times could Alex go to the restaurant without choosing the same ...

**Math**

Dominic drove 324 miles from Salt Lake City,Utah, to Bryce Canyon National Park in 6 hours and 34 minutes. What was his average speed, in miles per hour?

**PHYSICS**

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 8.9-kg projectile from rest to a speed of 4.2 × 103 m/s. The net force accelerating the projectile is 1.4 × 105 N. ...

**english**

Lots of my friends think that prince's music is old. But I think it's not only excellent but also on innovation.

**Math**

If each voter voted for only one candidate what is the fewest number of voters who would have to vote differently in order for Susan to have received more votes than James if Susan had 212 votes and James had 244 votes?

**Math**

Thank you

**Math**

Given that f(x) = 2x2 – 3, find f(2)

**Physics**

a horizontal force of magnitude 20.0 N is applied to a 3.05 kg book as the book slides a distance d = 0.87 m up a frictionless ramp at angle θ = 30°. The book begins with zero kinetic energy. What is its speed at the end of the displacement?

**physics**

A person in a kayak starts paddling, and it accelerates from 0 to 0.59 m/s in a distance of 0.43 m. If the combined mass of the person and the kayak is 72 kg, what is the magnitude of the net force acting on the kayak?