Wednesday

February 22, 2017
Total # Posts: 124

**Physics**

The electric field from an infinitely large and uniformly charged sheet is independent of the distance from the sheet, yet the individual charges in the sheet all produce fields that object the inverse square law. Why doesn't the field get weaker at greater distances?

*February 20, 2017*

**algebra**

-3(4y-9)+2(2y+6)

*December 17, 2016*

**Math**

Paul runs a speed of 9 miles per hour. How many miles per second is his speed?

*November 3, 2016*

**Physics fundamentals**

When a crate is moving on a track where friction is not negligible. The friction force is said to be kinetic friction static friction Non existant

*October 17, 2016*

**Physics**

A) An object with mass M=10kg is held on a incline. The object and the incline surfaces have a static friction coefficient of 0.3. What is the maximum angle at which the object starts moving? B) Again, suppose that the force in A) is a push applied horizontally on the mass ...

*October 16, 2016*

**physics**

How do you find the scalar product of two vectors, A=8m along the y-axis in the negative direction and B=15m, 30 degrees from the y-axis in the first quadrant. Thanks!

*October 4, 2016*

**Physics**

I think it is D) but I'm not quite sure. Thanks in advance! Right after the ball is thrown at angle of 45 deg, the acceleration is a)g b)sin(45) * g c)cos(45) * g d)tan(45) * g

*October 3, 2016*

**Physics(check my answer please!!)**

Hello, could you guys let me know if this looks right? Thanks in advance. A ball is fired at a speed of 8 m/s at 20 degrees above the horizontal from the top of a 5m high wall. a) what is the total velocity at the maximum height? b) how far from the launcher will the ball hit ...

*October 3, 2016*

**Physics continued**

Sorry, I didn't see that there was a second part to the question. What is the difference between this one and the previous question I posted? The x and y components of a certain force are measured and found to be Fx = 68 ± 3N and Fy = 42 ± 2 N, respectively. ...

*September 26, 2016*

**physics**

What equation do I use to find this? Thanks The x and y components of a certain force are measured and found to be Fx = 68 ± 3N and Fy = 42 ± 2 N, respectively. Calculate the error associated with the magnitude of this force?

*September 26, 2016*

**math**

Lucia is hoping that Angela will buy her a geometrically interesting piece of land on which he will build a mansion. Lucia has said that she will only buy the land if it costs less than $4.00 per square foot. The plot shown below is listed for $453,175. Is Angela going to be ...

*May 2, 2016*

**Math**

There is a football field. Around the field is the section of a spectator. The edge of the football field is 5 meters distance from the outside edge of the section of the spectator. The section of the viewer is 130m in length and has a width of 85m. The use of these measures ...

*February 1, 2016*

**physics(optics)**

The critical angle between an equilateral prism and air is 45 degrees.if the incident ray is perpendicular to the refracting surface,then what happens?

*December 30, 2015*

**math**

game board 23 1/2 inches on all 4 sides= what will be the size of 64 squares on the board=

*December 25, 2015*

**math**

if the equation given is y^2-6y=24x+3, how do i out this equation into standard form, using complete the square as needed?

*December 15, 2015*

**math**

Please how did you get -28/3

*November 8, 2015*

**math**

In a recent Math Duel, my team began by graphing 51x+24+75. If our opponents graphed a line parallel to ours, they might have graphed A. 17x+16y=25 B. 17x+8y=50 C. 34x+8y+50 D. 34x+16y=50

*July 22, 2015*

**math**

If the product of 1999 real numbers is -1998, at least how many of these 1999 real numbers must be negative? A. none B. 1 C. 1997 D. 1998

*July 22, 2015*

**math**

If x and y are reciprocals of each other, then their product always equals A. 1 B. x^2 C. y^2 D. 1/x^2

*July 22, 2015*

**math**

The number ? could be the sum of three consecutive integers. A. 0 B. 2 C. 4 D. 8

*July 22, 2015*

**math**

If w whistles cost c cents, how many whistles can you get for d dollars?

*July 9, 2015*

**math**

On a certain legislative committe, 3/8 of the committee members are Republicans. If 2/3 of the members are men and 3/5 of the men are Democrats, what fraction of the members are Democratic women?

*July 9, 2015*

**math**

If 8% of c is equal to 12% of d, which of the following is equal to c+d?

*July 9, 2015*

**algebra**

5/2=×/7

*March 26, 2015*

**math**

Don't laugh at me lol...it says Jamal is 5 feet tall. One sunny morning he notices that he casts a shadow that is 2 feet long. If the school building casts a shadow that is 7 feet long at the same time, what is the height of the building?

*March 26, 2015*

**Math Algebra**

Jessica is 4 years younger than Jennifer now. In 10 years, Jessica will be twice the age that Jennifer is now. Find the present ages of Jennifer and Jessica

*January 10, 2015*

**uga**

Assume the z test statistic equals 0.99, find the the p-value if Ha:p> 0.50

*October 27, 2014*

**Science**

A hammer with a 500-g head exerts an average force of 810n on a nail speed as it drives the nail 4 mm into wall. What was the speed of the hammer head when it hit the nail?

*September 10, 2014*

**Geometry**

A tree on a 30 degree slope grows straight up. What are the measures of the greatest and smallest angles the tree makes with the hill?

*September 2, 2014*

**math**

Is 16.6 a rational number?

*August 27, 2014*

**math**

is the square root of 9 a rational number?

*August 26, 2014*

**math**

A Coast Guard ship patrols an area of 125 square miles. The area the ship patrols is a square. About how long is each side of the square? Round your answer to the nearest mile.

*August 26, 2014*

**Economics**

In relation to Economics, explain the difference between nominal data and real data? *if someone can help me understand this better, I would be greatful.

*July 28, 2014*

**Physics 1**

Two balls have the same size and mass. One is hollow, the other one is solid. How would you determine which is which without breaking them apart?

*April 17, 2014*

**Physics 1**

If you see an object rotating, is there necessarily net torque acting on it? Explain

*April 17, 2014*

**physics**

jabu phuses a cart that is of mass 5kg with a speed of 1m,s she suddenly increase the force acting on the cart to move 2m,s for a distance of 50m (a)calculate the force causing the cart to speed up

*April 15, 2014*

**Math**

I don't know

*April 7, 2014*

**Chem**

1) Which solution will have the lowest OH- A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 2) Which solution will be the strongest base? A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 3) Which aqueous solutions are acidic? A) Na2CO3 and NaHCO3 B) NaCl and NH4Cl C) NaHSO4 and ...

*April 5, 2014*

**Physics**

A knife thrower throws a knife toward a 300-g target that is sliding in her direction at a speed of 2.30 m/s on a horizontal frictionless surface. She throws a 22.5-g knife at the target with a speed of 39.5 m/s. The target is stopped by the impact and the knife passes through...

*March 4, 2014*

**science**

A dog (canis familiaris) and a coyote (canis latrans) will readiliy mate in captivity and their offspring are healthy and fully fertile. Are we justified in saying they are distinct species? What might this tell us about the history of dogs and coyotes?

*January 21, 2014*

**Physics**

A music is played causing 82 dB. A baby cries causing 72 dB annoying the people around him by 123.7 m. What is the sound intensity level?

*December 11, 2013*

**Physics**

A skydiver falls in air reaching terminal velocity, he shouts to his friend at 2000 Hz. His friend receives it at 2355 Hz, what is the divers speed?

*December 11, 2013*

**Physics**

A simple harmonic pendulum has a period of 3.19 s and initial speed of 2.12 m/s. Find the length.

*December 11, 2013*

**Physics**

A rocket is fired with 9.37 km/hr, find the maximum altitude. (no air resistance)

*December 11, 2013*

**Physics**

Two organ pipes are imitating a sound of 12 Hz, one of them is 12 m long. What is the length of the other pipe?

*December 11, 2013*

**Computer**

How do i write a ratio into excel

*October 20, 2013*

**math**

Will someone please help me solve this problem. Solve and Check 3x^2=2x=5

*April 21, 2013*

**Physics**

During a brown-out, the electric power company drops the voltage of the power line and the incandescent light bulbs in your house become dimmer. When this happens, the filaments in the bulbs operate at a lower than normal temperature, so a. their color is somewhat bluer than ...

*January 30, 2013*

**Social Studies**

Thank you .....I got it right...

*January 11, 2013*

**Social Studies**

How did Roosevelt’s response to German aggression toward Britain differ from his response to Japanese aggression toward China? I think it is C or D? A.He condemned the aggression toward China but not toward Britain. B.He condemned the aggression toward Britain but not ...

*January 11, 2013*

**Math**

3x – 7y < –21 how would I graph this? Please help.

*December 13, 2012*

**PSYchology 220**

D

*December 9, 2012*

**Calc**

if your questions are all involving the same subject, just post them under a single question

*December 9, 2012*

**math**

A kicker punts a football from 3 feet above the ground with an initial velocity of 47 feet per second. Write an equation that gives the height (in feet) of the football as a function of the time (in seconds) since it was punted. Find the height (in feet) of the football 2 ...

*December 9, 2012*

**math**

solve by completing the square x^2-3x=4 please show work

*December 9, 2012*

**Math: Algebra 1**

Thank you - 2 more :)

*November 27, 2012*

**Math: Algebra 1**

2. What is the solution of the system? 7x + 5y = 19 –7x – 2y = –16 A.) (2, 1) B.) (1, 2) C.) (7, 5) D.) (–7, –2) I think it is A.

*November 27, 2012*

**Math: algebra 1**

Thank you - can you check the other 2 that are submitted and not answered - thanks again

*November 27, 2012*

**Math: algebra 1**

6. In which quadrant does the solution of the system fall? y = x – 1 y = –3x – 5 A.) I B.) II C.) III D.) IV I think it is c.

*November 27, 2012*

**Math: Algebra**

1. Which method would be the simplest way to solve the system? 7x + 5y = 19 –7x – 2y = –16 A.) graphing B.) substitution C.) elimination D.) distributive I think it is C.

*November 27, 2012*

**Math: algebra 1**

3. Which method would be the simplest way to solve the system? y =1/2 x 2x + 3y = 28 A.) graphing B.) substitution C.) elimination D.) distributive I think it is B.

*November 27, 2012*

**science grade 7**

False

*November 8, 2012*

**Science**

Waht animals are in the Nile Delta? I already have crocodile & hippo. I need 1 more mammal, a type of fish, and an insect.

*November 6, 2012*

**Chemistry**

How many grams of KNO3 (molar mass = 101.103 g/mol) should be used to make 325.0 ml of 0.070 M solution?

*November 5, 2012*

**math**

45 divide by 9 + m x 3 = 23? Help??

*October 10, 2012*

**Chemistry**

A student reacted 5.33 grams of cobalt with oxygen gas and obtained 7.50 grams of cobalt oxide. Determine the empirical formula of this cobalt-oxygen compound based upon this experiment.

*September 26, 2012*

**world geography**

why are climates grouped by latitude?

*September 1, 2012*

**Science(Chemistry)**

HCL+Al=AlCl3+H2 What is the ionic equation,the spectator ions and the overall or net ionic equations?

*August 18, 2012*

**Science(Chemistry)**

Explain what would happen when bromine water is added to potassium iodide solution and what is its balanced chemical equation?

*August 18, 2012*

**Science(Chemistry)**

Mg+H2O=MgOH+H2 What is the ionic equation,the spectator ions and the overall or net ionic equations?

*August 18, 2012*

**Science**

ive got 2 questions: the star Vega is 25 lightyears away from us. if we sent a radio message to Vega, and another civilization on a planet circling that star answered us, in what year could we expect to hear a reply? why was it necessary to make radio telescopes so much bigger...

*June 20, 2012*

**math**

The probability that a voting-age adult in 2004 voted in the presidential election was 0.57. Five voting-age adults in 2004 were randomly selected. Find the probability that exactly 2 or the 5 adults voted in the presidential election.

*May 12, 2012*

**Math**

A bullet hole in the wall at height of 7'6 inches from the floor. Bullet passed through wall at angle 34 degrees. If they assume that the gun was fired from a height 4' above the floor, how far away from the wall was it when it was fired? (nearest inch)

*May 4, 2012*

**Math**

Find the perimeter of a right triangle which has a side 7 in. long and the angle opposite to it measures 37 degrees.

*May 4, 2012*

**trig**

sin theta = o/h that leaves adjacent side open a^2 + b^2 = c^2 3^2 + b^2 = 7^2 9 + b^2 = 49 b^2 = 40 b = srt 40 adj side now equals sqrt 40 tan theta = o/a = 3/sqrt 40 = 3 * sqrt 40/40

*March 19, 2012*

**Biology**

What is the importance of embryo polarity during cleavage?

*February 25, 2012*

**Chem**

I don't get it

*February 4, 2012*

**Mixed numbers and improper fractions**

3.6

*January 25, 2012*

**grammar**

Which is the correct verbal usage of the following sentence? I let it there while I stood and applauded or I left it there while I stood and applauded?

*January 24, 2012*

**Geomtry**

Five fences meet at a point to form angles with measures x, 2x, 3x, 4x, and 5x around the point. Find the measure of each angle.

*December 11, 2011*

**Spanish 8th grade**

I have to put these in the past tense-Are they correct? 1. Tú hablas por teléfono. Tú habaste por teléfono. 2. Nosostros bailamos mucho los fines de semana. This would be the same in past tense, I think?? 3. Tú y yo cantamos los domingos. ...

*November 16, 2011*

**Math**

Find the present value needed to have $ 1.00 compounded quarterly for 5 years at 6% using the formula (a) 74 ¢ (b) 75 ¢ (c) 76 ¢ (d) 77 ¢ (e) 78 ¢

*November 3, 2011*

**pyshics**

A small rock moves in water, and the force exerted on it by the water is given by the equation Fd = kv, where k is a constant. The terminal speed of the rock is measured and found to be 2.0m/s. The rock is projected upward at an initial speed of 6.0m/s. You can ignore the ...

*October 19, 2011*

**chemistry**

Calculate the concentrations of all species present in a 0.32 M solution of ethylammonium chloride (C2H5NH3Cl).

*October 16, 2011*

**math**

simplify 5/7 - 1/2 (1/3+3/7)

*September 19, 2011*

**technology**

how can you protect your own eletronic siginture?

*July 30, 2011*

**11 U chemistry**

Predict the products of a reaction between solid beryllium chloride and solid potassium,write the products in a balanced chemical equation also indicate what type of reaction this is.

*June 7, 2011*

**HSM 220**

what are thre ways human resources help support the strategic goals of human service organizations?

*March 8, 2011*

**geometry**

Find, to the nearest tenth of a centimeter, the length of a diagonal of a square if the measure of one side is 8.0 centimeters.

*March 1, 2011*

**math**

f(x)=sin(e^(4x)) f'(x)=??

*February 24, 2011*

**math**

A 75ft diagnol brace on a bridge connects a support of the center of the bridge The horizontal distance that it spans is 15ft longer than the hieght that reaches on the side of the bridge.Find the horizontal and vertical distance spanned by this brace

*February 14, 2011*

**physical**

Does that give me a negative velocity?

*February 5, 2011*

**physical**

A boy throws a stone vertically up to a man standing at a heigt of 2 m above the boy. Of the stone is thrown up with a velocity of 7.0m s what is the velocity of the stone at the instant when it is caught by the man. A clear explaination is greatly appreciated

*February 5, 2011*

**chemistry**

Because like dissolves like. Oil is a nonpolar molecule which then is the same as sugar. They are both nonpolar.

*November 25, 2010*

**4th grade**

23*17

*October 27, 2010*

**Chemistry**

m=12grams Molar Mass= 180.18 V=.1L n= m/MM= 0.067 moles. Molarity= n/V= .067/.1= .67 M1V1=M2V2 => 0.67(.05)=M2(.5) Solve for M2 and you get .067 M= m/VMM : Molarty= mass/ Volume x Molar Mass so m= MVMM : mass= Molarity x Volume x Molar Mass m= .067(.1)(180.18)= 1.21 Just ...

*September 29, 2010*

**Chemistry**

Which of the following statements about boiling points are false: A. the boiling point of 0.1 m KF(aq) is lower than the boiling point of 0.1 m ethanol(aq) B. the boiling point of a 0.5 m aqueous solution of NaOH is the same as the boiling point of a 0.5 m aqueous solution of ...

*September 8, 2010*

**math- Calculus**

If lim x->6 f(x)g(x) exists, then the limit must be f(6)g(6). True or false? Explain why it's true or false. Help!

*August 24, 2010*

**math**

Thank you Ms. Sue

*August 8, 2010*

**math**

Ms. Sue I have read it and im confused on the +-8, im not sure if that is a plus sign or T, sorry for the confusion.

*August 8, 2010*