Monday

April 21, 2014

April 21, 2014

Total # Posts: 563

**Chemistry**

Doing some homework, are my answers right? HCN= Polar HCOOH= Polar H2CCCH2= Nonpolar Out of the following elements: Na, H, and Au order them least to greatest in the following: Eletronegativity= Na is smallest, H is second, Au is largest Ionization Energy= Na is smallest, Au i...

**Science**

Right Answers: True A B C C B C D

**chemistry**

A chemist needs a HCl solution with a molarity of less than 0.400 M for an experiment. To find out if a sample of HCl solution can be used in the lab, the chemist performs a titration to neutralize 59.2 mL of the HCl with 45 mL of 0.400 M NaOH. Based on the results, will the a...

**Stats**

A random sample of size 100 is drawn from a population with a standard deviation of 10. If only 5% of the time a sample mean greater than 20 is obtained, the mean of the population is ______.

**Math**

Thank you for the answer now I understand. For the next question I made a mistake this is the question elli has two 8 and 1/2 pound bags of mints. She plans to put 1/12 pound at each place setting. Will she have enough mints? She has 256 guests I think that means 256 place set...

**math**

Ellis plans to hand out door prizes as the guest arrive she has 256 guests every 6th guest will receive a mug and for every 14 guests will receive a t shirt. Which guest will be the first to receive both mug and at shirt? Next question is elli has 8 and 1/2 pound bags of mints...

**Math**

Explain how to use a protractor to measure an angle.

**Maths**

A flat circular disc, of radius R, can be modelled as a thin disc of negligible thickness. It has a surface mass density function given by f(r,φ) = k(1 - r2/R2), where k is the surface density at the centre and r is the distance from the centre of the disc.Using area int...

**Computer Programming using python**

DO IT BY YOURSELF OR YOU WILL NOT LEARN! GOOD LUCK!

**Algebra**

What is the mean of all even integers from 123 to 987?

**Physics **

An unmarked police car traveling a constant 80km/h is passed by a speeder traveling 135km/h. Precisely 3.00s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.50m/s^2 , how much time passes before the police car ov...

**math**

sorry not 12 mths. 3200/600 = 5.3mths

**math**

x - 3y = 3200 y = 600 x - 3(600) = 3200 x = 5000 x/y = 12mths

**maths**

An initial-value problem is given by the differential equation, f(x,y) = x + y, y(0) = 1.64 The Euler-midpoint method is used to find an approximate value to y(0.1) with a step size of h = 0.1. Then use the integrating factor method, to find the exact value of y(0.1). Hence, d...

**Equation **

Four times a number, increased by 25 is 13 less than 6 times the number. What is the number? 4n+25=-13-6n. ???

**math**

57.5 hr

**math**

I think

**math**

57.5 hr

**English **

I need to write 2 paragraphs about my favorite movie giving 4 reasons why, but don't have one. Please Help..!!

**Math**

I am a two digit even number. I am less than 30. When you list out all of my factors, they add up to 60. who am I?

**Chemistry**

Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C

**trig, math**

There was no diagram to show me that. It was just this question.

**trig, math**

Given triangle ABC with a = 16, b = 14, and β = 54°, find the value of c.

**Python Help **

# Cis108 07/03/2014 # The PCCC Palace Hotel - Final Bill # To write a bill per party regarding there stay at the Palace Hotel including there billing invoice # Ask the user there name and number of days they will be staying in the Palace customer = input ("Enter customers...

**Math**

You are paneling an office that has 2 walls measuring 18' x 8' and 2 walls measuring 9' x 8'. How many sheets of paneling will you need, assuming each panel sheet measures 4' x 8'?

**Math**

Compute the square footage of carpet needed to cover a room 10' 6" x 12' 3". Area (to the nearest tenth) = square feet. Can you explain the steps on how to solve this problem.

**Math**

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What will be the le...

**Math**

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What will be the le...

**Math**

A vehicle covers 2,160 miles in 5.5 hours. What is the average speed of the vehicle to the nearest tenth. I got 55.5, but I don't think it is correct.

**Math**

Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds? I tried this problem and the answer is not 26.40

**Math**

prove identity Sin2x - sinx/cosx + cos2x= sinx/cosx + 1

**Language**

Read the poem and answer the questions that follow 1.There once was a cowboy named Ray 2. Who never had that much to say, 3. Except for the times 4. Stampedes stopped on a dime 5. When that cowboy named Ray hollered Hey 1.in which lines do you see repetition? 2. What is the ex...

**Math**

Yes, I copied it correctly. I was wondering too. Thank you for your help

**Math**

How do you find the price of each share if 700 shares of stock are sold for $55.00 ?

**Math ASAP please**

#1 is p = 0.20k + 100. #4 is correct.

**Math**

crap, i screwed up writing my answers. Ignore them please.

**Math**

So I have a question regarding advanced functions, logarithm stuff. here is the question: Beginning with the function f(x) = log[base(a)]x ,state what transformations were used on this to obtain the functions given below: a) p(x) = -(5/8) log [base(a)]x b) r(x) = log[base(a)](...

**Calculus-Inverse Functions**

is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you

**Calculus**

The continuity of floor functions the function: x - floor(x) it is continuous on what interval? i got all real numbers except for integers. is this right. thank you.

**math**

but why the choice for ln?

**math**

nevermind on 2), i would appreciate an asnwer to 1) though

**math**

I asked the following the other day and received the following answer: Posted by Matthew on Sunday, March 17, 2013 at 11:03pm. A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0...

**math**

The value, V, of a $25000 vehicle after y years is given by V = 25000 (0.85)y What is the rate of depreciation? (1 mark) What will the car be worth after 5 years? (1 mark) To the nearest month, how long would it take to reduce the vehicle’s value to 10% of its original am...

**math**

A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0.964 g. What is the half-life, in seconds, of oxygen-19?

**Chemistry**

An experiment requires 0.7 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.7 M base?

**Please help check physical science!**

Please help check my answers I really want to make a 100%! 1. A mechanical wave moves through a medium, which can be (1 point) A. a liquid. B. a solid. C. a gas. D. all of the above <-- This one 2. Which type of kind of wave causes the medium to vibrate only in a direction ...

**Theoretical&Experimental Probability please help!**

Please check my work thanks!! A number cube with the numbers 1 through 6 is rolled. Find the given probability. 1. P(number < 2) (1 point) A. 1/6 <--- i think this one B. 2/6 C. 4/6 D. 3/6 2. P(number ≥ 3) (1 point) A. 4/6 B. 1/6 C. 2/6 <-- this i think D. 5/6 ...

**algebra**

real world situation a problem describing incresing then constant and finally decreasing

**Science**

a 5-kilowatt source powers a motor that is lifting a 30 kg mass straight up. how far will the mass move in 6 seconds

**math 5th**

help

**math**

Burj Khalifa is the world tallest building in Dubai at 828 m tall. The CN Tower in Toronto is 553 m tall. Sam wants to compare the Burj Khalifa and the CN Tower by creating rectangular prism models on a 10 cm by 10 cm square base. She has decided to represent the Burj Khalifa ...

**Math**

Several friends are taking turns flying a kite. Each friend flies the kite for the same amount of time. They spend 6 hours flying the kite altogether. Explain what information you need to find how long each friend flew the kite for.

**Chemistry**

A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 h. What is the half-life of this radioactive isotope?

**Chemistry**

All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639,000 y, what is its half life

**Chemistry**

What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!

**TRIGONOMETRY**

Write the following trigonometric expression as an algebraic expression in x free of trigonometric or inverse trigonometric functions sin(cos^-1 x) -1≤x≤1

**Chemistry**

16. n^2= number of orbitals

**Chemistry**

dE= -Rh((1/nfinal^2)-(1/ninitial^2)) Rh is a constant = 2.178E^-18

**Chemistry**

never mind, I figured it out.

**Chemistry**

Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction. 2 NaN3(s)--> 2 Na(s) + 3 N2(g) What mass of NaN3(s) mu...

**Algebra**

A petroleum company has two different sources of crude oil. The first source provides crude oil that is 35% hydrocarbons, and the second one provides crude oil that is 60% hydrocarbons. In order to obtain 120 gallons of crude oil that is 55% hydrocarbons, how many gallons of c...

**Physics**

In reply to Jennifer, her explanation is CLOSE to be correct. Instead of converting rpm to rps, convert it to rad/s and use that as the velocity. To do this, multiply the rpm by 2π and then divide by 60. Use that and the radius in the formula then divide by 9.8 and you go...

**Physics**

In reply to Jennifer, her explanation is CLOSE to be correct. Instead of converting rpm to rps, convert it to rad/s and use that as the velocity. To do this, multiply the rpm by 2π and then divide by 60. Use that and the radius in the formula then divide by 9.8 and you go...

**chemistry**

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals exerted by the shelf foo...

**Chemistry**

A photocell is a device used to measure the intensity of light. In a certain experiment, when light of wavelength 530 nm is directed on to the photocell, electrons are emitted at the rate of 5.1 10-13 Coulombs/sec. Assume that each photon that impinges on the photocell emits o...

**Physics**

i.imgur. com/cqwun. png i'm kind of stuck.. are the answers 6, -3, -3, and 0?

**math**

how do you find the % on a spinner?

**math**

What is the compatible estimation for 329 + 64

**Physics**

i.imgur. com/VWFwb. png

**Physics**

Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles per hour?

**Physics**

A "rocket car" is launched along a long straight track at = 0 . It moves with constant acceleration = 2.5 . At = 3.0 , a second car is launched with constant acceleration = 8.7. At what time does the second car catch up with the first one? How far have the cars trave...

**Physics**

A juggler throws a ball straight up into the air with a speed of 20. With what speed would she need to throw a second ball half a second later, starting from the same position as the first, in order to hit the first ball at the top of its trajectory?

**Physics**

When jumping, a flea reaches a takeoff speed of 1.5over a distance of 0.45. A.) What is the flea's acceleration during the jump phase. B.) How long does the acceleration phase last?

**Math**

What are two ways to read x/16?

**math**

1. A year on earth is 365 earth days so a year on mars would be longer. 2. 686-365= 321 days longer 321 days divided by 7 days in one week = 45.857 weeks longer.

**Math**

Oh, nevermind. Found it. The answer is 721 eggs...

**Math**

Can anyone help?

**Math**

Well, the thing is, the problem says that only one eggs is left over, but, four has three extra, and five has one extra... I'm throughally confused...

**Math**

That helps but I need a little more help than that...

**Math **

I have to figure out how to do this problem. I don't have the slightest idea how to even begin it, so if you can lead me through it, step by step, I would be very grateful. A woman is walking home with eggs in her bag. Suddenly, a car comes speeding towards her. She jumps ...

**Algebra**

algebraic expression for the sum of twice a number squared and 7

**English**

What is the sentence pattern for: The waterfall rushed down the steep hillside. options: s-v-io-do s-lv-pa e-v-s s-lv-pn s-v-do s-v-do-oc quest pattern s-v

**Science - Chemistry**

What happens when you mix Sodium Bicarbonate, Bromothymol blue, and Calcium Chloride? What is Bromthymol blue used for in this experiment?

**Math**

Compare. write >, <, or= 2/5 4/5 7/10 3/5 1/2 4/7

**Please help!- science**

how do nerve fibers in the brain send messages

**Math**

first three terms of a geometric sequence are the same as the 1st, 9th and 11th terms of an arithmetic sequence, respectively. What is the common ratio in the geometric sequence ? Thanks!

**Science please help!**

A lamp connected to a battery lights up. If a second, identical lamp is connected to the battery in parallel, the current drawn from the battery will _____ , and compared to the original brightness of the first lamp, both lamps will be _____ . will the current increase and bot...

**Science!**

Always forms virtual images at the same distance behind the optic as the object is in front of it. I thought it was concave but im not sure if concave lens form a virtual images when its infront of the optic

**math**

change .7 to hundreds

**English**

Thank you very much, Writeacher. I need to revise these sentences, too. 1) I was last proud of myself when I helped one of my friends one week ago. She lost her father after a tragic accident (better: in) and I'm currently supporting her emotionally. 2) I often blamed (cor...

**Physics**

A car is initially traveling at 20 m/s when it accelerates to 35 m/s in a time of 5 seconds. What is the acceleration of the car in m/s^2?

**English**

Here are other sentences I need to check. I really hope you can check them, Writeacher. 1) blamed my friend Peter for breaking some plates, but the real guilty was me. I’m quite independent of my parents because I do a lot of things without their help. 2) I’m not ind...

**English**

I urgently need to revise a few sentences containing reflexive pronouns. I really hope you can help me. 1) I was last proud of myself when I won a swimming competition. I (once) blamed one of my friends for telling me a lie. 2) I depend on my parents. I’m still dependent ...

**English**

Yes, it does make sense. Blasè means uninterested. Could you please check if everything is OK as I made a few changes? Thank you very much! 1) Mr. Otis buys Canterville Chase from Lord Canterville. After that, Mr. Otis drives with his family to Canterville Chase. 2) Whe...

**English**

Writeacher, what does "blasè" mean? Example: I was getting a bit blasè by the time I had my last interview. I still need to check a sentence. Thank you very much. 1) Speaker 2 believes that appearance is important when going for an interview. For this r...

**English**

Writeacher, I downloaded a few details about modals expressing possibility/probability but I'm still doubtful about their use. My questions to you are numbers 1-2. Using modals to talk about the present: 1)Will / won't We use will and won’t when we are very sure: ...

**English**

Sorry, for asking you the same thing again, but I really don't know if I have to leave these two sentences as they are. 1. I have already been at school today. 2. I have already been to school today. (Is there a difference between them?) 3.I haven't been to the cinema ...

**English**

Writeacher, I downloaded a few details about modals expressing possiblity/probabity but I'm still doubtful about their use. My questions to you are numbers 1-2. Using modals to talk about the present: 1)Will / won't We use will and won’t when we are very sure: ...

**English**

I left out a sentence. Thank you very much, Writeacher. I haven't had my chess lesson yet. I haven't done my chess lesson (is a mistake). Can you suggest a site with exercises on the use of modals to express degrees of probabilities?

**English**

Writeacher, I really hope you can have a look at my last examples. I need to know which are wrong. I still have a few doubts on the use of to/at/in after have been. Thank you for helping me. 1) I haven't gone out for a walk. I have already been to school (or at school) tod...

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