Saturday

June 25, 2016
Total # Posts: 3,212

**Physics**

What is the longest wavelength of light that can be absorbed by a hydrogen atom that is initially in the second excited state?
*June 22, 2016*

**Physical Science**

Many people mistakenly believe that the astronauts who orbit Earth are "above gravity." Earth's mass is 6×1024kg, and its radius is 6.38×106m (6380 km). Use the inverse-square law to find a height above Earth's surface at that the force of gravity...
*June 21, 2016*

**Physical Science**

A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. If the speed is 3.1 m/s and the coffee table is 0.30 m tall, find the distance the coin lands from the base of the table. (Use g=9.8m/s2.).
*June 21, 2016*

**Physical Science**

Using the formula for gravity, find the force of gravity on a 0.80-kg mass at Earth's surface. (The mass of Earth is 6×10^24kg, and its radius is 6.4×10^6m.).
*June 21, 2016*

**Physics **

A skier slides down a frictionless slope of angle 30, is the mechanical energy conserved?
*June 20, 2016*

**Physical Science**

If your mass is 76kg, find your acceleration.
*June 10, 2016*

**Calculus**

so would it be 1/2(1-(1/e^4))
*June 2, 2016*

**Calculus**

A base of a solid is the region bounded by y=e^-x, the x axis, the y axis, and the line x=2. Each cross section perpendicular to the x-axis is a square Find the volume of the solid
*June 2, 2016*

**math**

a ________ represnts 25% of the data
*May 25, 2016*

**geometry**

If rectangle ABCD has vertices A(6, 2), B(2, 2), and C(0, 6), explain how to find the coordinate for the fourth vertex. Then describe how to verify that the angles of ABCD are right angles.
*May 24, 2016*

**physics**

as the permeability of a material is the ratio of the magnetic field strength and the magnetic flux, could the permeability of the material be multiplied by the magnetic field strength in order to calculate the flux?
*May 22, 2016*

**physics**

what is the importance/significance of calculating the magnetic flux density of a solenoid?
*May 22, 2016*

**Math**

I dont know
*May 17, 2016*

**Math**

If i have 8cups of raisins and i use 1/3cups for one bag how many bags can i make
*May 17, 2016*

**Physics**

7 g bullet is ﬁred into a 124 g block that is initially at rest at the edge of a frictionless table of height 1.3 m. The bullet remains in the block, and after impact the block lands 2.2 m from the bottom of the table. Find the initial speed of the bullet. The ...
*May 7, 2016*

**physics**

A typical red blood cell subtends an angle of only 1.7×10−5 rad when viewed at a person's near-point distance of 25 cm. Suppose a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance of 13.0 cm . ...
*April 22, 2016*

**Physics**

Find the minimum aperture diameter of a camera that can resolve detail on the ground the size of a person (1.5 m ) from an SR-71 Blackbird airplane flying at an altitude of 26 km . (Assume light with a wavelength of 470 nm .) I got 570 mm which is wrong
*April 21, 2016*

**Math**

Emily fills a container with 6cubes. Each cube has an edge length of 3cm. The container is in the shape of a right rectangular prism. What is the volume of the container in cubic cm
*April 18, 2016*

**science/biology**

introduction to cane toad
*April 14, 2016*

**history**

Greek language and Aramaic. ... the Pitinikas, the Andhras and the Palidas are other people under Ashoka's rule
*April 13, 2016*

**check my answers please**

what about the last one ?
*April 12, 2016*

**check my answers please**

1.)order the group of quadratic fractions from widest to narrowest graph. y=3x^2;y=5x^2;y=7x^2 a.)y=3x^2;y=5x^2;y=7x^2 b.)y=7x^2;y=5x^2;y=3x^2 c.)y=3x^2;y=7x^2;y=5x^2*** d.)y=2x^2;y=7x^2;y=3x^2 2.)the area of a play ground is 234yd^2. the width of the playground is 5 yard ...
*April 12, 2016*

**Math Check my Answers please ?**

1.)if an object is dropped from a height of 144 ft the function h(t)=-16t^2+144 gives the height of the object after t seconds. when will the object hit the ground? a.)1.5 seconds b.)3 seconds *** c.) 6 seconds d.)9 seconds 2.) the area of a play ground is 64 square yards. the...
*April 12, 2016*

**Math**

Please help ! 1.)a catapult launches a boulder with an upward velocity of 122 feet per second. the height of the boulder, h, in feet after t seconds is givin by the function h(t)=-16t^2+122t+10. what is the boulders maximum height ? and how long does it take the boulder to ...
*April 11, 2016*

**biology**

How does meiosis and fertilization in humans and other sexual reproductive organisms maintain the normal chromosomes number for each species?
*April 11, 2016*

**math **

If the bike wheel is rolled along the ground 10 inches, through what angle does the wheel rotate?
*April 6, 2016*

**Algebra**

A photo is printed on a 20-inch by 24-inch piece of paper. The photo covers 320 square inches and has a uniform border. What is the width of the border?
*March 22, 2016*

**Prob/Stats**

A survey revealed that 44% of movie goers will eat some amount of popcorn during a movie. If the next 17 movie goers are asked if they will eat popcorn during the next movie they attend, what is the probability that at least 8 will say they will eat popcorn during the next ...
*March 19, 2016*

**math**

The quotient for 20÷1/4 is 5. It wants to know which expression has the same quotient as 20÷1/4. A.1/2÷40 B.1/4÷20 C.15÷1/5 D.6÷1"10 None of these have the quotient of 5. So what are we doing wrong cause none have the choice of ...
*March 17, 2016*

**English Literacture**

In To Kill A MockingBird book by Harper Lee. What is the Boo Radley game? Who plays it and how do the different characters feel about it? In your response refer closely to the text to build a convincing argument.
*March 14, 2016*

**History**

Why do you think women and children remain the most vulnerable populations on the planet ? plez help me
*March 12, 2016*

**Physics (Inside the atom)**

A sample of radioactive isotope I is to be used for medical diagnosis of the kidneys. The isotope has a half-life of 8.0 days, and the sample is required to have an activity of 8 x 10^5 per second at the time it is given to the patient. Calculate the mass of the I-131 present ...
*March 10, 2016*

**algebra**

A family is building a circular fountain in the backyard the yard is rectangular and measures 6x by 7x and the fountain is going to be circular with a radius of 2x once the fountain is built what will be the area of the remaining yard?
*March 9, 2016*

**Physics - sound**

How can one recognise the beat frequency from a graph? Why is the beat frequency equal to the difference of the frequency of the two waves?
*March 7, 2016*

**physics**

A car moves 3 kph. Car B which is 50 m ahead of Car A is moving at 6 kph. If car A accelerates by 5m/s/s, determine if the cars will collide.
*March 2, 2016*

**science**

A car moves 3 kph. Car B which is 50 m ahead of Car A is moving at 6 kph. If car A accelerates by 5m/s/s, determine if the cars will collide
*March 2, 2016*

**PHYSICS**

a student consumed a 0.23 kg of juice with 115 calories per 1.15 serving. How much work you must perform to remove these calories?
*March 1, 2016*

**geometry**

. In , AD and BE are the altitudes to BC and AC respectively. If AD = 8 cm, BC = 10 cm and AC = 12 cm, find the length of BE.
*February 29, 2016*

**Mathematics**

How would I differentiate y = 4cos(2x)cos(3x) u = cos(2x) u' = -2sin(2x) v = cos(3x) v' = -3sin(3x) This is all I have so far
*February 27, 2016*

**PHYSICS**

A CHILD CONSUMED .23 KG OF JUICE WITH 115 cALORIES PER 1.15 SERVING. HOW MUCH WORK MUST PERFORMED TO REMOVE THESE cALORIES?
*February 27, 2016*

**PHYSICS**

im sorry , there is no unit indicated in 1.15 and the calories is with the small c :)
*February 27, 2016*

**PHYSICS**

A CHILD CONSUMED .23 KG OF JUICE WITH 115 CALORIES PER 1.15 SERVING. HOW MUCH WORK MUST PERFORMED TO REMOVE THESE CALORIES?
*February 27, 2016*

**Chemistry**

How does salt hydrolysis work between sodium hydroxide and lactic acid in a titration?
*February 25, 2016*

**Maths**

How do you derive: 2cos(3-2x)?
*February 24, 2016*

**history**

was the murder of Franz Ferdinand the main cause of ww1 Due on 24/2
*February 22, 2016*

**math**

the answer if 5
*February 19, 2016*

**Chemistry: stoich**

4. Suppose that an excess of propane, C3H8 , burns in 320 g of oxygen, How many moles of water will be formed? C3H8 + 5 O2 --> 3 CO2 + 4 H2O (1 point) 6.02 E 23 moles 1600 moles 4.0 moles 8.0 moles
*February 16, 2016*

**Chemistry**

5. How many grams of iron oxide can be produced from 2.50 g of oxygen reacting with iron, according to the following equation? 2 Fe (s) + 3 O2 (g) -->2 Fe2O3(s)
*February 16, 2016*

**Chemistry**

5. How many grams of iron oxide can be produced from 2.50 g of oxygen reacting with iron, according to the following equation? 2 Fe (s) + 3 O2 (g) -->2 Fe2O3(s)
*February 16, 2016*

**Algebra**

In a right triangle, one angle measures x degrees where sin x degrees= 5/8. What is the value of cos (90 degrees-x) ?
*February 14, 2016*

**physics **

Given that A= 4.00i(hat)+ 10.0j(hat)and B = 3i(hat)-5.00j(hat), find the magnitude and directions(i.e., angle with respect to the +x axis) of C= A+B magnitude = 8.6 I cant find out how to find the angle
*February 10, 2016*

**Math**

There are 5 chairs in a row, and three people. In how many ways c an you place the people on the chairs? (each person must occupy exactly one chair, so that two chairs will remain free).
*February 4, 2016*

**math**

The salary scale in three school districts are as follows, for a teacher with a master’s degree: District P: $30,000 plus $1500 for each year of experience District Q: $30,000 plus $1750 for each year of experience District R: $28,000 plus $1750 for each year of ...
*February 1, 2016*

**Math**

In which step is the error? Step 1: Let x = 1 and y = 1. Step 2: By substitution xy = y^2. Step 3: Multiplying both sides by -1, -xy= -y^2. Step 4: Adding x^2 to both sides, x^2-xy=x^2-y^2. Step 5: Factoring, x(x-y)=(x+y)(x-y). Step 6: Dividing both sides by x-y, x=x+y. Step 7...
*February 1, 2016*

**physics**

A blue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.2 m/s2. A green car arrives at the position of the stop-light 7.5 s after the light had turned green. What is the slowest constant speed which the green car can ...
*January 31, 2016*

**Math**

@Ms.Sue please help
*January 29, 2016*

**Math **

The ramp shown below is used to move crates of fruit to loading docks of different heights. When the horizontal distance AB is 12 meters, the height of the loading dock, BC, is 4 meters. What is the height of the loading dock DE? A. 12m B. 8m C. 9m D. 15m My answer is 9 is ...
*January 29, 2016*

**Science**

When you turn on a battery powered flashlight you transform... 1) heat into light chemical energy 2) chemical energy into electrical energy and light 3)heat into chemical energy and light 4) electrical energy and light energy into chemical energy
*January 28, 2016*

**Chemistry**

Write the equation for the dissolution of NH4NO3 in water. If 4.98 mol of NH4NO3 are dissolved, how many total moles of ions are produced?
*January 26, 2016*

**math**

the supplement of an angle is 20 degrees less than 3 times its complement. find the ratio of the supplement to the complement.
*January 23, 2016*

**Social Studies**

geariga please check
*January 22, 2016*

**Social Studies **

Which of the following state program areas consumes the largest part of the executive budget? (1 point) human services education *** natural resources transportation 2. Which state department is responsible for mental health-related issues and welfare? (1 point) human services...
*January 22, 2016*

**Chemistry**

Would there be any effect on the amount of precipitate in the experiment if tap water containing calcium ions is used instead of deionized water to dissolve the reactants. Assume that Na2CO3 is present in the excess.
*January 18, 2016*

**Math**

3) B 4) C i literally just finished this lesson lol
*January 14, 2016*

**check my english pleaseee**

1.)the storm *remains* a threat to the costal village a.)action verb b.)linking verb** c.)direct object d.)indirect object. 2.)which of these is a direct characterization of ted from " my brothers keeper " a.)im your kids brother five years younger than you are and ...
*January 8, 2016*

**Maths**

How do you factorise 2x^2 - x - 1
*January 7, 2016*

**Math**

please help!! which number is the solution of x/4=-5? a. 20 b. 1.25 c. -1.25 d. -20
*January 5, 2016*

**math**

where Amanda lives the sales tax is 7%. Amanda paid $35 in sales tax on a new stereo. what was the price of the stereo?
*January 4, 2016*

**Math**

are these answers correct. 1. c 2. a 3. d 4. b 5. d 6. b 7. b 8. c 9. d 10. b 11. c 12. d 13. a 14. d
*January 4, 2016*

**Math**

3(y+2) for y = 3 a. 21 b. 18 c. 15 d. 12 simplify 3+6y-2y+4 a. 4y+7 b. 8y+7 c. 6x-6 d. 9x-4 simplify 2(3x-2)+3x a. 9x-6 b. 6x-4 c. 6x-6 d. 9x-4 which number is the solution of x/4=-5? a. 20 b. 1.25 c. -1.25 d. -20 what is the solution to 12x=240? a. 20 b. 1.25 c. -1.25 d. -20 ...
*January 4, 2016*

**Math**

3(y+2) for y = 3
*January 4, 2016*

**Math / Fractions**

it's 8 because if you skip count by 2 or 4 you say "8"
*January 2, 2016*

**Physics**

Imagine a landing craft approaching the surface of the moon of a distant planet. If the engine provides an upward force (thrust) of 2890 N, the craft descends at constant speed; if the engine provides only 2200 N, the craft accelerates downward at 0.36 m/s2.
*January 2, 2016*

**Math**

To pass a course with a C grade, a student must have an average of 70 or greater. A students grades on three tests are 63, 76, 67. Find what score the student must get on the next test to get a C average or better
*December 14, 2015*

**Math**

Two ocean beaches are being affected by erosion. The table shows the width, in feet, of each beach at high tide measured where 1995 is represented by year 0. Western beach width Dunes beach Year number (in feet) width (in feet) 0 100 20 5 90 45 10 80 70 11 78 75 12 76 80 15 70...
*December 10, 2015*

**Social Studies**

oops sorry, the question is how would voters most likely react if political leaders raised taxes by 50% ?
*November 24, 2015*

**Social Studies **

A. they would not make any changes in their behavior. B. They would demand more public goods and services. C. They would stop voting in elections. D. They would not re-elect the leaders. i think A.
*November 24, 2015*

**Social studies (check please!)**

NVM i think its 1, check plzs
*November 24, 2015*

**Social studies (check please!)**

Which of these goods or services is paid for with federal taxes 1 community roads 2 military bases 3 public universities 3 police protection 3 Is correct
*November 24, 2015*

**Social Studies **

XYZ Gaming Inc. Wants to invest in some new goods to raise it's overall productivity. Which of these would be the best choice? Bigger desks for workers -- Faster Internet Service -- (Correct!) -- A new lunchroom -- Health training for employees --
*November 24, 2015*

**Social Studys**

ms sue
*November 24, 2015*

**Science**

The man lifted the 15 pound weight 2 feet above his head. How much work was done?
*November 22, 2015*

**math **

a bakery sells bagels for $0.85 each an muffins for $1.10 each the bakery hopes to earn $400 each day from these sales. Write an equation that represents the total amount the bakery would like to earn selling bagels and muffins each day. (sorry I have no idea how to do this...
*November 19, 2015*

**physics**

A 48-kg box is being pushed a distance of 7.5 m across the floor by a force Upper POverscript right-arrow EndScripts whose magnitude is 185 N. The force Upper POverscript right-arrow EndScripts is parallel to the displacement of the box. The coefficient of ...
*November 18, 2015*

**Physics**

Starting with an initial speed of 3.86 m/s at a height of 0.480 m, a 1.78-kg ball swings downward and strikes a 4.75-kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.78-kg ball just before ...
*November 17, 2015*

**Physics**

The moon is a satellite that orbits the earth at a radius of 3.85 × 108 m. The mass of the earth is 5.98 × 1024 kg. What is the orbital speed of the moon?
*November 12, 2015*

**Science**

How does the direction of the electric current, moving across a battery powered device, differ from the direction of travel in the AC current sent to homes and businesses
*November 12, 2015*

**Science**

Thank You
*November 12, 2015*

**Science**

Batteries are made of two metals with different electron affinities. What does the phrase “electron affinity” mean and how does this affinity affect the voltage of the battery
*November 12, 2015*

**Physics**

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 36.0 km/s and 50.6 km/s. The slower planet's orbital period is 7.78 years. (a) What is the mass of the star? (b) What ...
*November 8, 2015*

**Physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 11.5 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 204 kg. (a) Determine the tension in the cable attached to ...
*November 8, 2015*

**Math**

An art teacher has a box of pencils. 1/10 are green, 1/2 are blue, 1/4 are orange, and the remaining 45 are red. How many pencils are orange?
*November 2, 2015*

**English**

Please check my answers. Which of the following sentences is punctuated correctly ? On January 1, 2000, many people thought that the new millennium would bring the end of the world,but it didn't ******** On January 1 2000, many people thought that the new millennium would ...
*October 28, 2015*

**Physics**

A person is trying to judge whether a picture (mass = 2.37 kg) is properly positioned by temporarily pressing it against a wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.760. What is the minimum ...
*October 22, 2015*

**Physics**

A rocket blasts off from rest and attains a speed of 53.8 m/s in 17.4 s. An astronaut has a mass of 67.2 kg. What is the astronaut's apparent weight during takeoff?
*October 22, 2015*

**Physics- PLEASE HELP!!**

Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 62.25N@40.50 S of E??
*October 21, 2015*

**Quick english check**

Is 1 ponderous? Is 4 homogenous? Is 9 wary? Is 10 alloyed?
*October 21, 2015*

**Quick physics check**

Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 62.25N@40.50 S of E??
*October 21, 2015*

**Physics help**

A plane flies 230 mph at 60 degrees north of west for 2.5 hours. Answer the following questions. A. How far did it travel total? B. How far west did it go? C. How far north did it go? D. How fast did it go west? I don't know how to do this problem :(
*October 20, 2015*

**Statistics**

The second question is 0.754 because of this equation: (10C5)= (0.5^5)(0.5)^5 = 0.246 P(E')= 1-P(E) = 1-0.246 = 0.754
*October 19, 2015*