Friday

February 12, 2016
Total # Posts: 1,235

**i need help with science pls**

Which of the following types of stars started out on the main sequence with the largest initial mass? In Graph A, the curve peaks at 800 nm, in the red section of the visible light spectrum. In Graph B, the curve peaks at 550 nm, in the green section of the visible light ...
*February 10, 2016*

**Math pls help me pls pls**

If the outliers are not included, what is the mean of the data set? 72, 82, 3, 55, 62, 73, 90, 80, 151, 59, 46, 31 59 65 67 73 is it b
*February 10, 2016*

**calculus**

The table below gives selected values for the function f(x). Use a trapezoidal estimation, with 6 trapezoids to approximate the value of . x 1 1.1 1.2 1.5 1.7 1.9 2.0 f(x) 1 3 4 6 7 8 10
*February 9, 2016*

**math**

If $60 is put in an account that gets 7% per year, and I add $15 at the end of each year, how much will I have at the end of 8 years?
*February 7, 2016*

**Math**

I am trying to help my child with this problem and I have no idea what to do to solve this word problem. Paul used 1 1/4 gallons of paint to cover 3/8 of the walls in his living room. How many gallons of paint will Paul need to paint all the walls in his living room?
*January 15, 2016*

**calculus**

Determine if the Mean Value Theorem for Integrals applies to the function f(x) = x^3 − 9x on the interval [−1, 1]. If so, find the x-coordinates of the point(s) guaranteed to exist by the theorem. Not quite sure how to do this one at all to be completely honest. ...
*January 1, 2016*

**Physic**

Obtaining an algebraic Equation for T (0.300)(4190J/(kg*K)(T-70.0*C) + (0.100)(390J)/(kg*K)(T-20.0*C) I don't know how to use the Algebraic Equation on that?
*December 20, 2015*

**calculus**

Let Y = 7x sin-1(2x)+^3 square root 1+4x2. Find Y'. I don't know how to do the square root part. I have done y'= (7x)' (Sin^-1(2x)) + (7x)(sin^-1)'+...... y'= 7 sin^-1 + (7x)sq(2x)'/square root (1-(2x))^2 + .....
*December 13, 2015*

**calculus**

Anti-Derivatives 2x^6-x^3/x^2
*December 11, 2015*

**Chemistry**

A 100.0-mL sample of air is collected at 21 degrees Celsius and 772 mm Hg. What is the volume of air at STP? I know that I have to change deg. Celsius to K and mm Hg to atm. I'm stuck on what formula I should use... Should I use PV=nRT?
*December 10, 2015*

**Physics**

A ball projected with an initial velocity u at an angle tita to the horizontal cover a horizontal range of 26m after 5sec. Cal. The value of u and tita? g=10ms-1
*November 4, 2015*

**Physics**

I'd say your right. lol
*October 29, 2015*

**math**

Danika has yellow 10 buttons.She has 6 times as many black buttons. How many buttons does she have?
*October 27, 2015*

**math**

larry has a board that is 4 yards long. How much needs to be sawn off to make the board 2 feet 8 inches long? A) 1 ft 4 in B)8 ft 6 in C) 2 ft 6 in D/9ft 4 in
*October 27, 2015*

**ELA HELP FAST**

thank you
*October 18, 2015*

**ELA HELP FAST**

I need help researching to find information about the questions
*October 18, 2015*

**ELA HELP FAST**

Why is baseball in all its forms – from T-ball to the major leagues – important to Americans of all ages? What traditions have grown around baseball, and how do they affect the people who play and love the game? How can knowing about the game of baseball, its history...
*October 18, 2015*

**Pre-Calculus**

Got it. Thanks Reiny. It's 75/sin.667 .40x60=.667 And that comes out to the 6445.5 I was looking for
*October 15, 2015*

**Pre-Calculus**

And therein lies the problem, the book says it's 6445.5 ft. or 1.2 miles... Oh dear, it's 40' not 40*
*October 15, 2015*

**Pre-Calculus**

The angle of depression from the top of a 75 ft. lighthouse to a ship out in the ocean is 40*. How far out is the ship from the lighthouse? I've been stuck on this problem for an hour, I know the answer but don't know how to set it up/enter it in a calculator.
*October 15, 2015*

**Physics**

Resolve a force of 23 N at 180 degrees and a force of 47 N at 270 degrees.
*October 14, 2015*

**Math**

Thank you
*October 12, 2015*

**Math **

Simplify the expression 9 + 10h + -5h = 0 Please show steps
*October 12, 2015*

**math**

a sum of money is shared between to persons at the ratio 2:5 one person received $60 how much was shared
*October 5, 2015*

**physics**

An extreme skier slides down an incline that forms an angle 24 degrees above the horizontal. The skier starts from rest and accelerates firmly at 4.00m/s^2 for a distance of 50.0m to the edge of a cliff. The cliff is 30.0m above the powdery snow below. Find how far from the ...
*September 30, 2015*

**Fire protection eng**

17 hours
*September 29, 2015*

**Math **

-1.4m = 2.1
*September 28, 2015*

**Physics**

consider two solid cones made from a uniform material. The smaller cone is a ½ scale model of the bigger one. They are released from equal height, quickly reach their terminal velocities and fall in air until they hit the ground. Use scaling reasoning to predict which ...
*September 23, 2015*

**Physics(which cone will land first)**

consider two solid cones made from a uniform material. The smaller cone is a ½ scale model of the bigger one. They are released from equal height, quickly reach their terminal velocities and fall in air until they hit the ground. Use scaling reasoning to predict which ...
*September 23, 2015*

**Physics**

So what are you asking?
*September 23, 2015*

**maths**

What is the simplest form of 0.8
*September 23, 2015*

**Physics(volume flow rate)**

Imagine a house with two bathrooms/showers: one downstairs, the other upstairs. The volume flow rate of the shower head downstairs (2 meters above the ground level) is 4*10-4 m3/s. The cross sectional area of the shower head is 30 mm2. What is the volume flow rate of an ...
*September 22, 2015*

**Physics (density)**

A steel drum (barrel) has a volume of 200 Liters and a mass of 16 kg. It is filled to the top with an unknown liquid, sealed and thrown into water. It is floating with 50% of its volume underwater. What is the density of the liquid inside the drum? Assume the walls of the drum...
*September 22, 2015*

**Physics (cone in water) buoyancy **

h ttps ://s.yimg . com /hd/ answers /i /23e5f0847 ba74d75b223556433442f6f_A.jpeg?a=answers&mr= 0&x=1442542068&s =0f4a516a 3f24689d44f 28091e846bb0d link to see part a answer and an image of what is problem is. A cone of density p_0 (rho) and total height l floats in a liquid ...
*September 17, 2015*

**Social Studies**

YOU STUPID LMAO
*September 15, 2015*

**Physics Using hydrostatic equilbrium)**

3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Using this Imagine a planet of ...
*September 10, 2015*

**Physics (deriving Keplers 3rd law)**

How do I derive a straightforward form of Kepler's 3rd Law if I start with Newtons's Law of Gravitation. (the opposite of what Newton did)
*September 10, 2015*

**Physics ( using earth to find pressure of planet y**

good luck
*September 10, 2015*

**English**

Please, explain me what does it mean about this quote. “Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us. We ask ourselves, Who am I to be brilliant, gorgeous...
*September 9, 2015*

**Chemistry**

Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = -17.0 kJ, ΔS = -50.0 J/K, and temperature = 10.0 C.
*September 3, 2015*

**Chemistry**

f the ΔH of fusion for aluminum is 10.9 kJ/mol and the ΔH of vaporization is 284 kJ/mol, then what is the change in entropy upon melting down an aluminum can that weighs 18.9 grams?
*September 3, 2015*

**Math**

Create a table for each set of values. Test each table for equivalent ratios to find which set of values describes the proportional relationship of the two quantities. 66 ounces of peanuts to 89.1 ounces of walnuts
*September 2, 2015*

**physics14**

a non uniform bar which is 3m long weighs 60n. if the center of gravity is 1.1m from the larger end. and if the bar is supported at the midpoint, what load must be suspended at the smaller end to maintain equilibrium?
*August 31, 2015*

**Physics**

a 75 w compact fluorescent bulb operating at 30% efficiency. Calculate the amount of energy lost to heat and the amount of energy converted into light after the bulb has been on for 2.0h.
*August 29, 2015*

**math**

lola is placing appetizers on plates. she has 63 spring rolls and 84 cheese cubes. she wants to include both appetizers on each plate. each plate must have the same numbers of spring rolls and cheese cubes. what is the greatest number of plates she can make using all of the ...
*August 27, 2015*

**math**

Find the domain of f(x)=5x-1/x^2+8x+15?
*August 19, 2015*

**Scrambled Paragraph**

No it s r u t q
*August 4, 2015*

**Math**

I pretty sure it 31
*August 4, 2015*

**SCTD**

Physics a satellite orbiting 3.22 times 10 to the 5th power meters above the surface of the earth get the mass of the satellite is 3.80 times 10 to the 4th kilograms what is the weight or gravitational force exerted on the satellite by the earth?
*July 7, 2015*

**Math**

How many four digit numbers use the digit 7 two or more times?
*June 14, 2015*

**chemistry**

A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of water at...
*May 24, 2015*

**chemistry**

A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of water at...
*May 24, 2015*

**Calc**

A ball is thrown straight up from the top of a 200 foot building with an initial velocity of 40feet/second. acceleration due to gravity is -32feet/second. a) find a formula for the height of the ball at time t. b) how high does the ball rise before it begins to fall c) when ...
*May 5, 2015*

**Calculus**

Give a Right-hand sum approximation of integral 1 to 4 of x^2 with n=4? I have done this problem alot and my teacher says the answer is 30 but I cant get it. HELP
*April 19, 2015*

**Chem**

Potable water (drinking water) should not have manganese concentrations in excess of 0.05 mg/mL. If the manganese concentration is greater than 0.1 mg/mL, it imparts a foul taste to the water and discolors laundry and porcelain surfaces. In an acidic solution, manganese(II) ...
*April 18, 2015*

**Math**

Each day Julia's math Teacher gives class a warm up qs. It's true/false 20% of the times and multiple choice 80% . Julia gets 70% on true false correct and 90% on multiple choice correct. Julia answered today's question correctly. What's the probability that it...
*April 15, 2015*

**Math**

file:///C:/Users/Student/Downloads/plot2.png file:///C:/Users/Student/Downloads/ploy3.png file:///C:/Users/Student/Downloads/plot4.png
*April 3, 2015*

**Math**

file:///C:/Users/Student/Downloads/666994-3162012-122716-PM-1767412394.png
*April 3, 2015*

**Math**

the box and whisker plot show data for the test scores of four groups of students in the same class. which plot represents a group with a median grade below 65? (Posting plots in comments) I was thinking its A, but i'm not sure.
*April 3, 2015*

**math**

n/4=17/3
*March 26, 2015*

**chemistry**

Using each of the following equations, calculate the number total of moles of products that can be obtained through decomposition of 1.75 moles of the reactant? a. 2 NH4NO3---> 2 N2 + O2 + 4 H2O b. 2 NaClO3---> 2 NACl + 3 O2 answers are 6.12 and 4.38 but i don't ...
*March 25, 2015*

**science**

a person rolled a large ball across a field. What information is needed t determine how much work the person did?
*March 24, 2015*

**science**

Are there any websites that explain Mendelian genetics and show how to solve such problems in an easy, concise manner at an AP Bio level? Thank you
*March 18, 2015*

**Chemistry**

D. Ionic bonds; hold single atoms together
*March 18, 2015*

**Chemistry**

A 20.0-mL sample of 0.300 M HBr is titrated with 0.150 M NaOH. What is the pH of the solution after 40.3 mL of NaOH have been added to the acid?
*March 5, 2015*

**Algebra**

No wait, it's C right?
*February 18, 2015*

**Algebra**

A zero of a polynomial is: A. A real number that makes f(x) = 0 B. A real number that makes x = 0 C.A real or complex number that makes f(x) = 0 D. A real or complex number that makes x = 0 Is the answer A?
*February 18, 2015*

**Physics**

A car speeds up from 12 m/s to 20 m/s in 6.4s.If its mass is 1200 kg,what force must its engine provide ?
*February 11, 2015*

**HISTORY**

All of the following statements about the Declaration of Independence are TRUE except:
*February 11, 2015*

**Calculus**

Sketch the region enclosed by the curves x= 49-y^2 and x = y^2 - 49. Decide whether to integrate with respect to x or y. Then find the area of the region.
*February 9, 2015*

**Algebra**

Teri finds a pile of money with at least $600. If she puts $200 of the pile in her left pocket, gives away 4/5 of the rest of the pile, and then puts the rest in her right pocket, she'll have more money than if she instead gave away $600 of the original pile and kept the ...
*February 7, 2015*

**math**

C A D D C ^^ answers. 100%
*February 6, 2015*

**math**

what is the greatest common factor of the polynomial show? rectangle tiles that have 6x and 6 look like this: ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** !!! !!! !!! !!! !!! !!!
*January 31, 2015*

**math**

what is the greatest common factor of the polynomial show: rectangle tiles that have 6x and 6 look like this: ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** !!! !!! !!! !!! !!! !!!
*January 30, 2015*

**accounting**

the board of directors declares 15% stock dividend on10000 outstanding shares of$20 per common stock. Thee current market value is $25 per share. how should I journalize this entry?
*January 26, 2015*

**Math**

your mom sucks ass
*December 31, 2014*

**Physics**

You're right, it is small, but it's not a typo. How is the change in momentum 90*5?
*December 24, 2014*

**Physics **

Two students (90.0 kg and 60.0 kg) on roller skates face-to-face push against each other. The 90.0 kg student moves at 5.0 m/s just after their hands lose contact. I figured out part A (final velocity of 60.0 kg student) to be 7.5 m/s backward. I need help with part B. (b) ...
*December 24, 2014*

**Chemistry**

If a 40 gram sample of radioactive isotope was present at 4pm, but a 5 gram sample remained at 4:30 pm, what is the half-life in minutes?
*December 15, 2014*

**Probability**

placed marbles in a bag. 6 of the marbles are red and 4 of them are yellow. reach into the bag and remove two marbles. a.) i.) What is the probability that both of the marbes you draw out are red? ii.) What is the probability that both of the marbles that you draw out are the...
*December 8, 2014*

**Physiology**

ok great thank you
*December 1, 2014*

**Physiology**

Any more suggestions about a few more answers?
*December 1, 2014*

**Physiology**

Population Control Women's Rights Religious Reasons/Moral Reasons
*December 1, 2014*

**Physiology**

What would be (3) world arguments for birth control and two (2) world arguments against birth control?!
*December 1, 2014*

**science**

A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
*November 30, 2014*

**physics**

A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
*November 29, 2014*

**physics**

A hot air balloon is traveling vertically upward at a constant speed of 2.7 m/s. When it is 11 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s 2 . Answer in units ...
*November 27, 2014*

**physics**

In Mostar, Bosnia, the ultimate test of a young man’s courage once was to jump off a 400-year-old bridge (now destroyed) into the River Neretva 24 m below the bridge. How long did the jump last? The acceleration of gravity is 9.8 m/s 2 . Answer in units of s
*November 27, 2014*

**trig**

solve each equation if 0 < x < 2pi. answer must be in radians 1. 4 cos x - 2 = 0 2. 3 sec^2 - 4 = 0
*November 24, 2014*

**Physics**

A piece of aluminum has a volume of 1.55 x 10-3 m3. The coefficient of volume expansion for aluminum is = 69 x 10-6(C°)-1. The temperature of this object is raised from 25.9 to 406 oC. How much work is done by the expanding aluminum if the air pressure is 1.01 x 105 Pa?
*November 23, 2014*

**physics**

You are trying to find out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 17 m. With what velocity did the balloon hit the ground? The acceleration of ...
*November 19, 2014*

**physics**

The barrel of a rifle has a length of 0.976 m. A bullet leaves the muzzle of a rifle with a speed of 561 m/s. What is the acceleration of the bullet while in the barrel? A bullet in a rifle barrel does not have constant acceleration, but constant acceleration is to be assumed ...
*November 19, 2014*

**physics**

Two airplanes leave an airport at the same time. The velocity of the first airplane is 710 m/h at a heading of 27.5 ◦ . The velocity of the second is 650 m/h at a heading of 167◦ . How far apart are they after 3.3 h? Answer in units of m
*November 19, 2014*

**physics**

The initial speed of a body is 6.64 m/s. What is its speed after 1.38 s if it accelerates uniformly at 4.7 m/s 2 ? Answer in units of m/s
*November 19, 2014*

**Physics**

A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the tank, compressing the trapped air, whose temperature remains constant during the descent. The tank ...
*November 11, 2014*

**Physics**

A wire is made by attaching two segments together, end to end. One segment is made of aluminum and the other is steel. The effective coefficient of linear expansion of the two-segment wire is 19.0 x 10-6 (C°)-1. What fraction of the length is aluminum?
*November 9, 2014*

**Physics**

A steel ruler is calibrated to read true at 21.6 °C. A draftsman uses the ruler at 44.5 °C to draw a line on a 44.5 °C copper plate. As indicated on the warm ruler, the length of the line is 0.314 m. To what temperature should the plate be cooled, such that the ...
*November 9, 2014*

**Physics**

1.71 kg of glass (ρ = 2.66 x 10^3 kg/m3) is shaped into a hollow spherical shell that just barely floats in water. What are the (a) outer and (b) inner radii of the shell? Do not assume the shell is thin. Volume = 2.66 * 10^3/1.71 V=1555.56 m^3 V=pi(r^2)h
*November 1, 2014*

**much needed help...**

Physics
*October 22, 2014*

**much needed help...**

The sugar concentration in a solution (e.g., in a urine specimen) can be measured conveniently by using the optical activity of sugar and other asymmetric molecules. In general, an optically active molecule, like sugar, will rotate the plane of polarization through an angle ...
*October 22, 2014*