Monday

July 28, 2014

July 28, 2014

Total # Posts: 481

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

**Physics**

Compute the final temperature.

**Physics**

A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm ^ 3 of air at atmospheric pressure (1.01\times 10^5 Pa}) and a temperature of 27.0 degrees C. At the end of the stroke, the air has been comp...

**Physics or Math**

Yay thanks, thought it was simple thank you.

**Physics or Math**

I thought maybe I mixed up the order, and that I should have done (3,0,0) - (-1.3,2.4,0), point minus "effective origin" (the rotation axis) which makes more sense, this changes it to 12.67k, is that correct?

**Physics or Math**

A force F = 0.8 i + 2.5 j N is applied at the point x = 3.0 m, y = 0 m. Find the torque about the point x = -1.3 m, y = 2.4 m. Hmm, (this is essentially just a vector problem) I know you're supposed to find the position vector r and take the cross product of r x F, the fo...

**math**

3 sail boats to 6 fan boats

**Math**

The panels for the Pulsar 32-inch TV are manufactured in three locations and then shipped to the main plant for final assembly. Plants A, B, and C supply 50%, 30%, and 20%, respectively of the panels.The quality-control department of the company has determined that 1% of the p...

**Physics**

An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?

**physics**

A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between the two force...

**Physics**

You will fire the spring gun 3 times from the first detent and measure the change in height of the (pendulum + ball) for each shot. Write the equation for the change in height of the first shot.

**algebra**

M --- +. 5= -2 3.

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the proce...

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the proce...

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the proce...

**Stats**

A large population has a mean of 200 and a standard deviation of 40. Which one of the following best describes the percentage of measurements that fall in an interval that is within two standard deviations of the mean?

**Physics**

The function ax(t) describes the acceleration of a particle moving along the x-axis. At time t=0, the particle is located at the position x0 and the velocity of the particle is zero. ax(t)=a0e−bt The numerical values of all parameters are listed below: x0=980 m a0=500 m...

**Physiology**

Why does a solution of Haemolysed red blood cells look clear instead of cloudy?

**Chem**

Can a 100ml sample of 3.0m H2 SO4 could be neutralized by 100 ml of 3.0m NH3

**College Physics**

A person who is properly constrained by an over-the shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed about 30 "g"s (1.0 g= 9.8m/s^2) Assumind uniform deceleration of this calue calculate the distance over which the...

**Physics PLEASE HELP!**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2? I asked this today, and the person told me to do 0.029 * 6.022e23 and my answer was wrong :/ Can someone please tell me what my answer should be!!?

**Physics**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2?

**phsical science**

a tire contains air ata pressure of 2.8 bar at 10 degree celsius.if the tires volume is unchanged what will the air pressure in it be when the tire warms up to 35 degree celsius if the car is driven.

**Chemistry**

If 45.5 mL of He at 25.0°C and 101.3 kPa were heated to 75.0°C, what would be the volume?

**Math**

Write the equation of a line in slope intercept form that is parallel to the line y= 1/3x+ 5 and passes through (-9, 5). Do not use any spaces. Slope should be a reduced improper fraction.

**Accounting**

T/F Questions The main reason that the bank statement cash balance and the company's cash balance do not initially balance is due to timing differences. Sales Discounts is a revenue account with a credit balance. Multiple Choice: Assuming a 360-day year, proceeds of $48,75...

**Algebra**

Bayside Insurance offers two health plans. Plan A pays $90 + 40%. Plan B pays $140 + 35%. Giselle would savfe with plan B if she had more than ---in bills.

**Life Orientation**

Identify and describe one environmental problem that causes crises,ill health,and disasters in South Africa?

**Reading**

What is the scene illustration-reflective plot

**life orientation**

The growth in the environment is growing and people pollute the area by burning their rubbish and even their cars exhaust pipes that pollutes the air.Many people doesn't care about the environment but rather kills it than looking after it!

**Financial Accounting**

Is Depreciation expense recorded in the General Journal?

**Math**

8 = 6 + p/2 *The p/2 is not dividing it's p over 2 like in a fraction.

**science**

Name the type of reaction that the equation represents? 2Cu + O2 -------> 2CuO

**math**

208 times 2

**math**

208 times 2

**science**

if the distance between crest were 1.5 meters apart, and 2 crest pass the pole each second, what would be the speed of the wave ?

**Science**

Which distance is the greatest ? A. The distance across the Milky Way Galaxy. B. The distance to the nearest star Cluster. C. The distance across the solar system. D. The distance to the nearest Galaxy.

**algebra**

for the algebraic function described by the expression x^2+2x-6 and written as the function f(6) = x^2+2x-6, what is the evaluation of f(6)?

**8 Grade Math**

At the same time that a flagpole casts a 4.5 m shadow , a meter stick casts a 1.5 m shadow. How tall is the flagpole ?

**Pre-Calculus**

Verify: 1/(1-sintheta) * 1/(1+sintheta) = sec^2theta sec^2theta is the answer, it would be great if someone can do the steps for me. thank you.

**math**

The tail on Alex 's dog is 5 1/4inches long.This lenght is between which two inch-marks on a ruler?

**Chemistry**

1) A compound has the following percentages by mass: barium, 58.84%; sulfur, 13.74%; oxygen, 27.43%. Determine the empirical formula of the compound. 2) If a 1.271-g sample of aluminum metal is heated on a chlorine gas atmosphere, the mass of aluminum chloride produced is 6.28...

**Physics**

Vf2=(m1+m2)(Vo1)/m1 m1=truck; m2=car; Vo1=initial speed of truck. mo1Vo1=mf1Vf1+mf2Vf2; substitute Vf2 to find Vf1

**Chemistry**

How many grams of NH3 can be produced from 3.26 moles of N2? How many grams of H2 are needed to produce 13.99 g of NH3?

**Chemistry**

Use a grammatically correct English sentence to describe how the mass in amu of one molecule of a compound is related to the mass in grams of one mole of that compound.

**Physics**

A girl throws a stone form the top of a building with an initial velocity of 20.0 m/s upward. The building is 50.0 m high and the stone just misses the edge of the roof on its way down. Draw a v vs t graph, find time needed for stone to reach max height, find max height, time ...

**Physics**

A person pushes on a 62-kg refrigerator with a horizontal force of -256 N; the minus sign indicates that the force points in the −x direction. The coefficient of static friction is 0.61. (a) If the refrigerator does not move, what are the magnitude and direction of the s...

**pre-calculus**

Could someone please help me with this problem? square root of (2x+1) -5 = 8 I think I take the 5 and add it to the 8 and then I have square root of (2x+1) = 13 then do I square both sides and end up with 2x+1 = 13^2 2x+1=169 2x+1-1=169-1 2x=168 x=84 am I even close on this?

**Physics**

The elevator has not moved yet, so the normal force and the force of the man's weight are equal. The answer is 431.2 N n - mg = ma n - mg = 0, so n = mg n = 44.0*9.8 n = 431.2

**algebra**

so yhu just find a common denominator???

**algebra**

5. If x=8 and y=3, find the value of 4/x - 1/y. well i would substitute 8 for x and 3 for y. then it would be 4/8 - 1/3. 0.5 - 0.33333 would it then be 0.2333? 8. If x=6 and y=5, find the value of x/8 + 2/y. well i would substitute 6 for x and 5 for y. then it would be 6/8 + 2...

**Physics**

As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure below gives their velocities v as functions of time t as the conductors slow the trains. The slowing processes begin when the trains are 240 m apart. What is t...

**Physics**

actually should I do 2.3 m/s divided by 343 seconds to get .00599 m/s^2?

**Physics**

From t = 0 to t = 5.00 min, a man stands still, and from t = 5.00 min to t = 10.0 min, he walks briskly in a straight line at a constant speed of 2.3 m/s. (a) What is his average velocity vavg in the interval 2.000 min to 7.90 min? I found this to be 1.15 m/s (b) What is his a...

**Calculus**

Find the derivative of y with respect to x. y= (lnx)/(3+4lnx) Should I start by using the quotient rule?

**Calculus**

Find the derivative of y with respect to x. y= [(x^5)/5]lnx-[(x^5)/25] How would I go about doing this? Should I use the product rule to separate (x^5)/5]lnx ?

**math**

The area of a square with a side length of s is s to the second power. What is the area of a square with a side length of 3 inches?

**math**

Thank You So Much Sam! :)

**math**

Use the “difference of squares” rule to factor the following expression 49-4y^2 my answer is going to be (7-2y)(7-2y) I wasnt sure if it could of been (7-2y)(7+2y)

**Algebra**

Andrew factored the expression 28x^3-42x^2+35x as 7x(4x^2+6x-5). But when Melissa applied the distributive law and multiplied out 7x(4x^2+6x-5) , she got 28x^3+42x^2-35x ; thus, Andrew’s solution does not appear to check. Why is that? Please help Andrew to understand this...

**social studies **

what was the cause of the boston massacure?

**algebra**

An online retailer had a sale that lasted 5 days. Approximately how many people visted the site during the sale? Assume that people who visited on more than one day were only counted once. Day 1 20,000 Day 2 25,000 Day 3 30,000 Day 4 25,000 Day 5 20,000

**algebra**

a celing in a new home rises 8 feet over a distance of 29 feet, Find the slope of this celing. round your answer to two decimals places.

**Health**

Sara? Which one is someone smoking Cocaine and not Crack Cocaine send me the exact link to only a photo of someone smoking Cocaine.

**Health**

could u please send me the exact link?

**Health**

Can someone answer

**Health**

Ok, I know that Crack Cocaine can be smoked, but can Cocaine be smoked? If so I need a picture of someone smoking Cocaine not Crack Cocaine though and for the picture just copy and paste the link of the direct picture ASAP

**McLoughlin**

Yes, Oregon territory is correct, and yes that is EXACTLY what happened between McLoughlin and Simpson,

**Health**

yes can someone please answer my question

**Health**

Srry I wrote that above wrong I meant to say wht r the effects on the body?

**Health**

Thanks Sara, so the effects on the so wht r the effects on the body>?

**Health**

but i need the effects cocaine has on the body in one separate section and then the mind separate and then behavior

**Health**

Ok wow thanks very much but for that exact question that i asked---- for the effects on the body, mind, and behavior could u please like write wht the effects on the body are and then the effects on the mind and then effects on behavior all separate and organized ASAP please i...

**Health**

What are the short term effects of Cocaine: When someone consumes this substance what effect will it have on their body, mind, and behavior? Please answer ASAP I really need the answer... and please don't give the website for me to find the info, I don't have enough ti...

**Health**

what pic do i use?

**algebra 1**

Write a point-slope equation for the line with the given slope that contains the given points. m= -1;(-3,6)

**math**

for math homework it is algebra and we have to use a ti-83 plus calculator to convert things, thats the one our teacher told us. but i do not have one. so i was wondering if anybody knew of a website that i could use a free calcutar online?

**Spanish**

this is why i love being puerto rican lol 30.c 31.a 32.d 33.c 35.c 36.a 37.b 39.b 41.c 42.b

**Spanish**

this is perfectly right

**math**

but if she wants to earn 150 and she already has 20 would she subtract 20 from 150? how is it 20+7m<150

**math**

for this question, if carolwants to earn $150.00 but she already has earned $20.00 would she subtract that or just look for an inequality

**math**

i do not want an answer i just dont get how to do this problem. i have a packet and i do the ones i get and ask for help with the ones i dont. i just ask for an explanation on how to do the questions that i do not understand.

**math**

carol wants to earn at least $150.00 for her charity while running in a race. she will earn $20.00 for participating plus $7.00 for each mile she runs. if m represents the number of miles shre runs, which inequality represents the money carol wants to earn?

**math**

thank you.

**math**

Katie converts the outside temperature from degrees fahrenheit, f, to degrees celsius, c. She uses the formula below to convert the temperature. (F-32)5/9=c if the outside temperature is 50 degrees fahrenheit, what is the outside temperature in degrees celsius

**math**

thank you.

**math**

ok so it would be b+a<2b because b and a added together would be less than b times 2?

**math**

The cost of one burrito,b,and one taco,a, is less than the cost of two burritos. Which inequality represnts this relationship

**math**

thank you again

**math**

90?

**math**

jordon has $608 in his savings account. He withdraws 15% of the money to pay for school clothes. which is the best estimate for the amount of money jordon withdraws?

**math**

ok i understand now thank you.

**math**

i do not understand how to do this. can you please explain.

**math**

Renee must solve the equation 4x+12=6x. If she subtracts 4x from the left side of the equation, what should renee write on the right side of the equation?

**math**

what is the product of the expression below? (2x-5)(2x-3)

**math**

thank you.

**math**

20/2.80=35/x 20x=35*2.80 20x=98 divided by 20 on both sides x=4.90?

**math**

a 20-ounce bag of popcorn costs $2.80. if the unit price stays the same, how much does a 35-ounce bag of popcorn cost?

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