Friday

May 27, 2016
Total # Posts: 4,841

**Physics**

A soccer ball of mass 550g is at rest on the ground. The soccer ball is kicked with a force of 108N. The player shoes is in contact with the ball for 0.3m. What is KE of the ball? What is the ball's velocity at the moment it loses contact with the soccer player's shoes?
*March 5, 2016*

**Math**

JASON DRIVES 50 MI TO A TRAIN and then continues his trip with a 210 mi train ride. the car travels 20 mph slower than the train. if total travel time is 4 hr, find the average speed of the car and the average speed of the train.
*March 2, 2016*

**math **

Given that f(x)=4x−3 and g(x)=4−x2, calculate f∘g(x)= g∘f(x)= THANKS
*March 1, 2016*

**Physics**

Rosie (mass 41 kg) pushes a box with a horizontal force of 140 N (31.472 lb) at a speed 25 m/min. A. What is Rosie’s power output? Answer in units of W. B.What energy is produced by a 300 W lightbulb lit for 4.1 hours? Answer in units of J
*February 29, 2016*

**Physics**

Zak, helping his mother rearrange the furniture in their living room, moves a 42.3 kg sofa 7.2 m with a constant force of 17 N. A. What is the work done by Zak on the sofa? Neglect friction. Answer in units of J. B. What is the average acceleration of the sofa? Answer in units...
*February 29, 2016*

**physics**

A light beam in air strikes the surface of a liquid at an angle 23.6 degrees from the normal. The angle of refraction in the liquid was measured to be 15.8 degrees, calculate the index of refraction for the object? calculate the speed of light in the object?
*February 29, 2016*

**Social Studies**

I think it is B
*February 29, 2016*

**Social Studies**

How did this law lead to the development of democratic principles? 6-9. When the litigants settle their case by compromise, let the magistrate announce it. If they do not compromise, let them state each his own side of the case, in the comitium of the forum before noon. ...
*February 29, 2016*

**Physics**

Four masses (2kg 3kg 1kg and 2kg) are arranged on a square of side 1.2 m. What is the moment of inertia if the axis of rotation is at the center of the square? What is the moment of inertia if you make the axis of rotation through mass 2kg (this mass cannot contribute to ...
*February 28, 2016*

**Maths**

Rs means Rupees (meant for Indian currency)
*February 28, 2016*

**Maths**

We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra Spent Balance Day 1 Rs 40 Rs 60 Day 2 Rs 30 Rs 30 Day 3 Rs 18 Rs 12 Day 4 Rs 12 Rs 00 -------- -------- Total Rs 100 Rs102......?
*February 28, 2016*

**math**

suppose a>0 and n is a positive interger. is (1/a)^-n = 1/a^-n ? explain your answer
*February 28, 2016*

**World History**

c. He wanted to rid Italy of the Bourbon monarch.
*February 25, 2016*

**statistics**

5 students go to school one of which is known to be late; in fact he is late 22% of the time. What is the probability that he will not be late for school.
*February 24, 2016*

**Physics**

A 20.0 m long uniform beam weighing 800 N rests on walls A and B, as shown in the figure below.(a) Find the maximum weight of a person who can walk to the extreme end D without tipping the beam.(b) Find the forces that the walls A and B exert on the beam when the same person ...
*February 24, 2016*

**Physics**

A sphere of mass 85kg is 12m from a second sphere of mass 65kg. A)what is the gravitational force of attraction between them?
*February 22, 2016*

**Physics**

Sally has a mass of 50.0kg and earth has a mass of 5.98X10^24kg. The radius of earth is 6.371x10^6m. A)What is the force of gravitational attraction between sally and earth? B)What is Sally's weight?
*February 22, 2016*

**Math**

Yay!
*February 22, 2016*

**Math**

Profit
*February 22, 2016*

**Math**

Income
*February 22, 2016*

**Math**

it 914 but is it profit or loss?
*February 22, 2016*

**Math**

A company reports the following income and expenses for a three-month period. What is the company's total profit or loss for the three month period? Great Reads Book Store Month Income Expenses ------------------------------------ June $12,458 - $10,968 July $10,396 - $10,...
*February 22, 2016*

**math**

So its A
*February 22, 2016*

**math**

which expression represents 5 less than y? A. y-5 B. 5-y C. y/5 D. 5y-1
*February 22, 2016*

**Math**

A round cake pan that is 2in deep and has a 7in diameter, plus a 6in by 9in rectangular cake pan that is 2in deep. Which of these pans has the larger volume and why?
*February 22, 2016*

**Chemistry **

For the reaction between ammonia and hydrochloric acid to produce ammonium chloride; What volume of ammonia is used (at 20 Celsius and 760mmHg) if 12.5gmof ammonium chloride are produced in the reaction? How many molecules of ammonia does this represent?
*February 21, 2016*

**Chemistry **

If the density of a gas is 1.2g/L at 745.torr and 20 Celsius, what is the molecular mass?
*February 21, 2016*

**Chemistry **

What is the density of NH3 at 800torr and 25 Celsius?
*February 21, 2016*

**Chemmistry**

Use this percentage to calculate the mass of fluorine (in g) contained in 54.0 g of copper (II) fluoride.
*February 21, 2016*

**Chemistry **

A 10.3g sample of an elemental gas has a volume of 58.4L at 758torr when the temperature is 2.5 C. Determine the identity of the gas.
*February 21, 2016*

**math**

the volume of a sphere is 4/3 pie radius squared. given that pie is 3.142 and radius is 7.3 calculate the volume of the sphere
*February 20, 2016*

**CHEMISTRY!!!! HELP**

3.) Calculate the mass of oxygen gas that can be produced in the decomposition of 5.55 g of silver oxide. This is what I did but is it right?... I need help with a few more btw to double check if i'm doing these right. So here is what I did: First: balance the equation 2 ...
*February 17, 2016*

**ChemistryHELP.PLEASE... TEST SOON**

TEST VERY SOON
*February 17, 2016*

**Chemistry**

Continue #2: So it says to : Calculate the mass of ammonia, NH3, that can be produced. Can someone explain how to derive to the answer? Please
*February 17, 2016*

**Chemistry**

1.) what mass of zinc is needed to completely react with 4.00 g of silver nitrate? 2.) If excess ammonium sulfate reacts with 22.5 g of calcium hydroxide according to the following unbalanced chemical equation: (NH4)2 SO4 + Ca (OH)2 → CaSO4 + NH3 + H2O Now, how do I go ...
*February 17, 2016*

**Chemistry Help please! (:**

Calculate the mass of oxygen gas that can be produced in the decomposition of 5.55 g of silver oxide. This is what I did but is it right?... I need help with a few more btw to double check if i'm doing these right. So here is what I did: First: balance the equation 2 Ag2 O...
*February 17, 2016*

**Math**

Thank you manny
*February 16, 2016*

**Math**

Find the difference. -24 - 5 =? A. -29 B. 29 C.-19 D.19
*February 16, 2016*

**Math**

Find the difference. -14 - (-16) =? A. 30 B. -30 C. 2 D.-2
*February 16, 2016*

**Math**

I think it is B
*February 16, 2016*

**Math**

which of the following is equivalent to (-2) - 5? A. -2 + (-5) B. -2 + 5 C. 2 +(-5) D. 2 - (-5)
*February 16, 2016*

**environmental engineering**

A lake receives 8 m3/s of inflow containing 0.3 mol/m3 of a chemical. The chemical reacts with a first order rate constant of 0.01 h-1. The outflow from the lake is also 8 m3/s. Assume there was no chemical in the lake at the beginning and volume of the lake is 106 m3. What ...
*February 10, 2016*

**environmental engineering**

Pesticide is applied to a 10 ha (hectare) field at an average rate of 1 kg/ha every month. The soil is regarded as 20 cm deep and well-mixed. The pesticide evaporates at a rate of 2% of the amount present per day and it degrades microbially with a rate constant of 0.05 day-1. ...
*February 10, 2016*

**Math**

Thank you niki
*February 10, 2016*

**Math**

Set the numbers from Greatest to least? 15%, 1/8, 0.2, 0.09
*February 10, 2016*

**math**

0.065
*February 10, 2016*

**math**

What is equivalent to 65%? Choose all the apply. 0.065 0.65 13/20 13/25
*February 10, 2016*

**algebra**

The loudness, L L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, d d, from the source of the sound. Round to 3 decimal places. A person 15 feet from a jetski, it is 75 decibels loud. How loud is the jetski when the person is 47 ...
*February 9, 2016*

**algebra**

The time required to do a job varies inversely as the number of people working. It takes 5hr for 7 bricklayers to build a park well. How long will it take 10 bricklayers to complete the job? (round answer to 1 decimal place)
*February 9, 2016*

**Social Studies**

It says it in the (bible) New World Translation of the Holy Scriptures in Act 2:36 You can look at it on j w. o r g ignore the spaces
*February 9, 2016*

**Social Studies**

Which key figure in Christianity does this image represent? It is a picture of Jesus tided to a cross A. Peter B. Paul C. Jesus <---- D. God I know that it is Jesus but he never died on a cross, he died on a pole.
*February 9, 2016*

**Social Studies**

I think it is D but i am not for sure
*February 9, 2016*

**Social Studies**

What influence did the Greek epics written by homer have on roman culture? A. They led Roman historians to question their loyalty to the Roman gods. B. They caused Roman historians to disagree over the origins of Roman culture. C. They inspired Virgil to compose an epic poem ...
*February 9, 2016*

**Reading**

Thank you for the poem Ms.Sue
*February 8, 2016*

**Reading**

In adventures of Isabel the only one of Isabel's enemies who survives is a? A.the bear B. the witch C. the giant D. the doctor
*February 8, 2016*

**math**

Find the projection of u = <-5, 3> onto v = <1, 4>.
*February 8, 2016*

**Pre-cal**

For z1 = 4cis (7pi/6) and z2 = 3cis(pi/3), find z1 * z2 in rectangular form.
*February 8, 2016*

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check) ive been asking this question 4 times still no one answer . someone pls do .
*February 7, 2016*

**Physics**

Two capacitor plates are equally and oppositely charged. They are separated by 1.30 cm. An electron is released from rest at the surface of the negative plate and, at the same time, a proton is released from rest at the surface of the positive plate. Where do the electron and ...
*February 6, 2016*

**math**

is that a big deal? if it is , then im greatly sorry ....and could someone answer my question pls /display.cgi?id=1454771086
*February 6, 2016*

**math**

vf=10*a vf=sqrt(2ad) or 10a=sqrt2ad 100a^2=2*500*a a=10m/s^2 vf=10*10=100m/s
*February 6, 2016*

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check)
*February 6, 2016*

**Physics**

use s= ut +0.5at^2 give 500 = 0(t) + 0.5 (9.8)t^2 t = 10.10s
*February 5, 2016*

**Pre-cal**

What is the area of triangle ABC if a = 19, b = 14, and c = 23?
*February 5, 2016*

**Math**

Tom has taken 3 tests with an average of 88%. However, Tom really wants an A. To get an A, he has to have an average score of 93%. What score does he need on the final test to get an A? I just don't get it. Can someone walk me through the steps to get to the answer?
*February 4, 2016*

**Physics**

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 12.8 m/s at an angle of 65.7° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed ...
*February 4, 2016*

**The Oregon Country Unit 2 Lesson 4**

perfect
*February 4, 2016*

**Physics**

a crate of weight fg is pushed by a force P on a horizontal floor. (a) the coefficient of static friction is us, and P is directed at angle theta below the horizontal. show that the minimum value of P that will move the crate is given by P=usFgsectheta / 1-ustantheta (b) find ...
*February 4, 2016*

**Math**

There are 40 cows and chickens in a farmyard. One quiet afternoon, Lola counted and found that there were 100 legs in all. How many cows and how many chickens are there? thx...
*February 1, 2016*

**Do I have enough time**

Oh yea if you have notes and know what you are going to talk about. Just go for it but make sure you get it done earlier next time
*February 1, 2016*

**math**

whats sets of number does the number 9/10 have?
*February 1, 2016*

**Science**

A storm with winds over 120/km/h that can last several weeks is a? A.Tornado B Hurricane C Jet Stream D Thunderstorm I think its hurricane am i right?
*January 29, 2016*

**Analytical chemistry **

The hydrogen sulfide in a 79.168 g sample of crude petroleum was removed by distillation and collected in a solution of CdCl2. The precipitated CdS was then filtered, washed and ignited to create CdSO4. Calculate the percentage of H2S in the sample if 0.122 grams of CdSO4 was ...
*January 28, 2016*

**math**

Mr. Dunn estimates he uses 3 gallons of gas over the course of a week. How many miles per gallon does his car get when he drives 105 miles?
*January 28, 2016*

**history plz help**

thanks @Reed you helped me look at the article in another perspective.
*January 28, 2016*

**history plz help**

I don't get what it accomplished... i have this right now The Louisiana Purchase encompassed 530,000,000 acres of territory in North America that the United States purchased from France in 1803 for $15 million.
*January 28, 2016*

**history plz help**

Can you guys help me get started with this, I really appreciate what your doing. @Ms. Sue @Reed
*January 28, 2016*

**history plz help**

During the early 1800s, the United States tried to make peace with other countries in order to grow and develop. Give an example of one of these peace efforts and briefly explain what it hoped to accomplish.
*January 28, 2016*

**physics**

I got 71.6*10^4?
*January 27, 2016*

**physics**

The speed of a space shuttle is 3.2×10^6 cm/s. Convert this into miles per hour (mph) using only 12 inches/ft, 60 seconds/min, 60 minutes/hour, and 1 inch = 2.54 cm. Factor Analysis must be used. Express your result to three significant digits and in scientific notation.
*January 27, 2016*

**math**

A cookie recipe calls for 3/4 of a cup of flour and makes one dozen cookies. How many cookies can you make if you have 10 cups of flour and want to use it all? I said 160 cookies. I used a proportion to solve this but is there another way to solve it?
*January 27, 2016*

**physics**

Dolphins can hear ultrasound with frequencies up to 280 kHz. What is the speed of sound in water if the wavelength of ultrasound with a frequency of 2.80 × 10^5 Hz is 0.510 cm? How long would it take this sound wave to travel to a dolphin 3.00 km away?
*January 25, 2016*

**physics**

A ship anchored at sea is rocked by waves whose crests are 21 m apart. The waves travel at 5.6 m/s. How often do the wave crests reach the ship?
*January 25, 2016*

**Math**

So when I do that I would have 24 4/7 divided by 4?
*January 23, 2016*

**Math**

Is that 24 divided by 4 when you made 23 4/7(mixed fraction) an improper fraction or is 24 just a whole number?
*January 23, 2016*

**Math**

Can you explain this: For my math problem 23 4/7 divided 4 it says to estimate. What do I do?
*January 23, 2016*

**Math**

Can you help me? My math problem is: 23 4/7 divided by 4 and it says to estimate. What do I do?
*January 23, 2016*

**physics**

A human ear can hear as low as 15.6 Hz. If the speed of sound in the air was measured to be 340.5 m/s, calculate the wavelength of this wave.
*January 22, 2016*

**physics**

For an ocean wave that has the crests 6 m apart and passing a boat every two seconds, calculate the speed of the wave.
*January 22, 2016*

**algebra **

Please show work* . i dont get how to do this at all only 1/3 of the university students wanted to become teachers . if 2600 didnt want to become teachers, how many university students are there?
*January 21, 2016*

**math**

.25 lb burger costs $2.95 .50 lb burger costs $3.90 how much does a pound of beef cost?
*January 20, 2016*

**Spelling**

Word for finished 3rd letter is r and the 5th letter is u
*January 20, 2016*

**Social Studies**

What is a group of government officials?
*January 19, 2016*

**math 8**

steve, thank you so much for explaining this. I get it now.
*January 18, 2016*

**math 8**

still having trouble getting y. why multiply top by 2. first time doing this, sorry thanks for the help
*January 18, 2016*

**math 8**

solve the system of equations 5x+2y=11 3x-4y=4 give answer as decimal if required. any help would be appreciated, thank you
*January 18, 2016*

**Science Help**

What happens to the density of the air in the balloon as it is heated?
*January 17, 2016*

**math**

Thank you Ms.Sue
*January 14, 2016*

**math**

Adding= Sum What are those kind of words for subtract divide and multiply? I am not for sure what they are called.
*January 14, 2016*