Sunday

August 28, 2016
Total # Posts: 1,122

**Math**

A floating leaf bobs up and down a total of 8 cm. the leaf completes 3 complete cycles in 8 seconds. (Assume equilibrium at t=0.)Write an equation to model the simple harmonic motion. Can someone explain to me why the answer to this problem is d=4sin(3pi/4)t?
*December 27, 2014*

**Math**

So because the question states "lowest point", the cos is negative?
*December 27, 2014*

**Math**

Will Rogers spun a lasso in a vertical cycle. The diameter of the loop was 6 feet, and the loop spun 50 times each minute. If the lowest point on the rope was 6 inches above the ground, write an equation to describe the height of this point above the ground after t seconds. ...
*December 27, 2014*

**Math**

Write an equation with phase shift 0 to represent simple harmonic motion with initial position -1/2, amplitude 1/2, and period 4. I got d=(1/2) sin (pi/2) t + (1/2). Is this correct?
*December 26, 2014*

**Math**

Why isn't it (2pi) / (3pi) or (2pi) / (3), since the problem asks when t=3?
*December 25, 2014*

**Math**

Find the amplitude, frequency, and distance when t=3 a. y=-15cos((pi*t)/3)+5 b. y=120sin100pi*t I think the amp for a. is 15, the freq is 3/2 cycles per unit of time, and the distance is 20, but I'm not totally sure if I'm approaching this problem correctly.
*December 25, 2014*

**English**

Ok now I do get it now. I understand what I will do for the rest. Thank you for your time.
*December 14, 2014*

**English**

No, I cannot. From what I see chapter 8 is mostly Pathos......except for when he talks how his grandmother was wronged. He is taking a stand for her.
*December 14, 2014*

**English**

That he is worried and scared. More anxious than most slaves since he has fallen under the hands of a kinder master. Anxious about his fate which lies in the hands of the white brutes.
*December 14, 2014*

**English**

Could I use from Chapter 8 of Frderick Douglass where they assault his broher as an ethos to show how they were cruel and or abusive?
*December 14, 2014*

**English**

I REALLY need help finding a use of Ethos in "Narrative of The Life of Frederick Douglass, An American Slave", chapter 8. Do not know if I should use part where they treat his grandmother badly after serving master for such a long time.
*December 14, 2014*

**Math**

near 2.50
*December 12, 2014*

**math**

The Suarez family paid $15.75 for 3 movie tickets. How much would they have paid for 12 tickets.
*December 7, 2014*

**math to mark**

Thay would weigh 210 pounds because you divide 150 by 5 and you get 30 and then you plug that in and you do 7 times 30 and that is 210 so the ratio is 5:7,150:210
*December 3, 2014*

**physics**

if the radius from the discus to the axis of rotation is 1.4m, what is the linear velocity of the discus at the time of release?
*December 3, 2014*

**Intro Biology**

Update, I got helped already.
*November 25, 2014*

**Intro Biology**

I can't find examples in the book as reference. Please help me with these questions and explain why. 1.) Which of the following has no vascular tissue (“plumbing system”)? A) Conifer B) Angiosperm C) Fern D) Moss E) Ginkgo 2.) Which of the following ...
*November 25, 2014*

**Physics**

Car 1 going northward (direction 90 degrees) at 14 m/s in an SUV weighing 2300 kg. car 2 going southwest (direction 225 degrees) at 16 m/s in a car that weighs 1600 kg. it is a completely inelastic collision. What is the direction and speed of the two vehicles immediately ...
*November 25, 2014*

**math**

Is the answer 18 students?
*November 18, 2014*

**math**

An art teacher has 1 1/2 pounds of red clay and 3/4 pound of yellow clay. The teacher mixes the red clay and yellow clay together. Each student in the class needs 1/8 pound of the clay mixture to finish the assigned art project for the class. How many students can get enough ...
*November 18, 2014*

**Thank Jiskha tutors**

I really appreciate all that you tutors do for us, I know we may be a bit demanding sometimes XD but we really love how you guys are always there to help us out. Coming from experience, I've had some past teachers that aren't as willing to help us when we do not ...
*November 16, 2014*

**history essay please help!**

Nevermind I got it but thanks!!!
*November 14, 2014*

**history essay please help!**

The goal of the essay is to tell what caused a skyrocketing population from 100 years ago to now. Well, I don't think I ended the essay good, can you help me end it? How about this: Those are just a few of the reasons, but modern technology has certainly done a role in the...
*November 14, 2014*

**history essay please help!**

Population growth is just how many people compared from 100 years ago to now. That's what I think it is.
*November 14, 2014*

**history essay please help!**

How does the growth of the world's population today compare with its growth 100 years ago? Explain why the changes have taken place. My essay: Today's world population growth compared to the population growth 100 years ago is a big, big difference. The population has ...
*November 14, 2014*

**Math**

Maggie makes some fruit punch. She mixes 2 1/2 quarts of grape juice with 1 1/2 quarts of orange juice. One quart of grape juice costs $1 less than one quart of orange juice. She finds that the total cost of making the fruit punch is $12.50. Calculate the cost of each quart of...
*November 4, 2014*

**Chemistry**

In the combustion of natural gas according to the equation CH4 + 2 O2 -> CO2 +2 H20, how many grams of water are formed during the combustion of 0.264 mole of CH4?
*October 26, 2014*

**math asap**

Thank you!!
*October 23, 2014*

**math asap**

Thank you but on more question, where did you get the 8 in 3/8, i was confused about that. because the question has 3/5
*October 23, 2014*

**math asap**

i'm pretty sure its 25 because 25+15 = 40, but i don't know how to get the 25.
*October 23, 2014*

**math asap**

if a 40 m rope is cut into two pieces in the ratio 3 : 5, how long is each piece? i tried: x=one piece 3/5 = x/40 x= 3*40/5 x=120/5 x=24 is that right?
*October 23, 2014*

**math**

If a 40 m rope is cut into two pieces in the ratio 3:5, how long is each piece? I tried it but I checked it and it was wrong, please help.
*October 23, 2014*

**Chemistry**

That's okay, I'm just wondering how to calculate the pH's at each mL increment in order to create the graph.
*October 22, 2014*

**Chemistry**

Plot the titration of a weak base with a strong acid. Show the titration curve using .106M NH3 and .225M HCl for a 50.00mL sample of the ammonia. No idea where to start here. I'm supposed to plot the curve from 2mL increments (0-30). Tip on homework: *Remember to use the ...
*October 22, 2014*

**Physics**

1.) Let's say that an an orange is launched upward at 22m/s. What is the displacement 3.5s later? 2.) When a volcano erupts, big rocks have been measured to reach heights of 50km (50,000m) What would the initial velocity need to be in order to reach such heights (neglect ...
*October 15, 2014*

**Physics**

Assume that the batter did not continue to swing the bat after the collision (no energy was added to the system). How fast was the bat moving after the collision? The ball mass .145kg, the bats mass is 1.1kg. And the balls velocity is 44.7m/s and the bats velocity prior to ...
*October 8, 2014*

**Science**

The flask shown here contains 10.0 ml of HCl and a few drops of phenolphthalein indicator. The buret contains 30ml of 0.130M NaOH. What Volume of NaOH is needed to reach the end point of the titration? I've used m1v1=m2v2, (x)(10.0ml HCl) = (0.130 M/L NaOH) (0.03L) and ...
*September 28, 2014*

**Pre-Calc**

1.) If you use the parent graph y=sqaureroot of x as a reference, how would you graph y=sqaureroot of x+2+5? a.) Move the parent graph two units to the right and then up five units. b.) Move the parent graph two units to the left and then up five units. c.) Move the parent ...
*September 26, 2014*

**Statistics**

Are my answers correct? Thanks! 1.) Based on a survey of a few thousand people, a newspaper reporter wants to draw conclusions about how a country’s citizens in general feel about the war in Iraq. At this point, is the reporter mainly concerned with data production, ...
*September 15, 2014*

**Statistics**

Are my answers correct? Thanks! 1.) Based on a survey of a few thousand people, a newspaper reporter wants to draw conclusions about how a country’s citizens in general feel about the war in Iraq. At this point, is the reporter mainly concerned with data production, ...
*September 15, 2014*

**PHYSICS**

Three forces, A,B and C act in the same vertical plane from point O. Force A is 30N and acts horizontally to the left of O. Force B is 40N and acts vertically upwards. Determine force C and the direction in which it acts, if the forces are in equilibrium.
*September 14, 2014*

**chemistry**

Express the rate of the reaction in terms of the change in concentration of each of the reactants and products. 2D(g)+3E(g)+F(g)>>>>2G(g) + H(g) when D is decreasing at 0.30 MOL/Ls, how fast is (H) increasing?
*September 8, 2014*

**trigonometry**

how fast is a toy car moving in ft/min if it makes 20 laps in one minute on a circular track of radius 3 feet ? ( i need to know how to set this problem up)
*August 31, 2014*

**PHI 208 **

T, HILL Self-love Humility Self-acceptance Relational harmony
*July 19, 2014*

**PHI 208**

Hill refers to the ability to understand oneself, to face oneself, and to be honest about the kind of creature one is by this term
*July 19, 2014*

**Math**

Cock
*July 2, 2014*

**math**

Paulo has $6 to spend. A sundae costs $3.25 plus $0.65 per topping. Write and solve an inequality to find how many toppings he can order.
*June 24, 2014*

**Math**

What is 7.061 as a mixed number?
*May 23, 2014*

**Algebra 2**

The shape of a park can be modeled by a circle with the equation x^2 + y^2 = 1600. A stretch of highway near the park is modeled by the equation y = 1/40(x - 40)^2. At what points does a car on the highway enter or exit the park? I am soooooo lost!
*May 22, 2014*

**Physics**

A 3.0 kg block is moved up a 37 degree incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the block is displaced 2.0 m up the incline. Calculate the change in the kinetic energy of the block.
*May 7, 2014*

**Physics**

A 3.0 kg block is moved up a 37 incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the block is displaced 2.0 m up the incline. Calculate the change in the kinetic energy of the block.
*May 7, 2014*

**Chemistry**

Not the value, the equilibrium constant. DrBob222, there's no instance of the letter "K" except in your own statement
*May 5, 2014*

**Chemistry**

you have to find the equilibrium constant for them.
*May 5, 2014*

**Chemistry**

Write the equilibrium constant expression for each of the following reactions: A. 4NO(g)+2O^2 <--> 2N^2O^4(g) B. 2NO(g)+ Br^2(g) <--> 2NOBr(g) C. CO(g)+ 2H^2(g) <--> CH^3OH(g) D. SO^2(g) + NO^2(g) <--> SO^3(g) + NO(g)
*May 5, 2014*

**History8**

It's C.
*April 25, 2014*

**math**

count by eigths to create a number line for the data that starts at 1 and ends at 3.
*April 24, 2014*

**Chemistry**

When given the equation 2Na+Cl2=2NaCl. How many liters of Cl2 will it take to react completely with 63.0 grams of Na?
*April 16, 2014*

**algebra **

a data set has the following points (0,2) (4,1) (6,0) the slope of the linear regression line is -0.32
*April 15, 2014*

**Computers**

Need help creating pseudocode for the following. Registration workers at a conference for authors of children's books have collected data about conference participants, including the number of books each author has written and the target age of their readers. The ...
*April 8, 2014*

**PROGRAMMING**

design a program for the following. Registration workers at a conference for authors of children's book have collected data about conference participants, including the number of book each author has written and the target age of their readers. The participants have ...
*April 8, 2014*

**Social Studies**

because the Old Testament referred to geocentrism and was considered most "authentic"
*March 27, 2014*

**math**

One day, the temperature outside increased by 6/10 every hour for seven hours. How much did the temperature increase that day?
*March 24, 2014*

**math**

Rachel spent 2 1/4 hours practing for her violin solo 5 times last week . How much times did Rachel spend practicing last week?
*March 24, 2014*

**signals and systems**

Ts=0.18, H(s)=3/s+3 ,find hI[n],HI[e^jw},hs[n]
*March 23, 2014*

**biology**

Can you give me a long list of smelly animals
*March 20, 2014*

**Chemistry**

2.04c
*March 4, 2014*

**stats**

chance+of+winning+if+you+play+10+times+what+is+the+probability+of you+winning+once if you have a 10% chance of winning each time
*March 3, 2014*

**Cyber safety**

A AC B 100%
*February 27, 2014*

**Chemistry**

A molecular compound has the empirical formula CH2. When 100mg of the compound is dissolved in 1.00 g of benzene, the solution freezes 1.75 degrees celsius lower than pure benzene. The Kf for benzene is 4.90 C/m. What is the MM of the compound?
*February 26, 2014*

**Math **

An open rectangular tank (no top) with volume 11 cubic meters has a square base. The base has side x m. Write an equation for the surface area of the tank as a function of the length x. Surface Area = ? b. The base costs 1.1 cents/square m and the sides cost 1.6 cents/square m...
*February 17, 2014*

**Math **

Consider the function f(x) = -2 x^3 + 36 x^2 - 162 x + 2. There are two critical points, A and B where A < B: A = and B = f''(A)= f''(B)= Therefore f(x) has a relative at A (MAX or MIN) and a relative at B (MAX or MIN).
*February 17, 2014*

**algebra 1**

when three times the distance to he finish line is increased by 5km, the total kilometers covered in the race will be between 50 and 89 km
*February 11, 2014*

**Finance**

Steve's ski shop has a net income of $389,000 with total sales of $2.5 million. Currently, the shop has debt of $500,000, equity of $800,000; receivables are 1.5 percent of sale, and Average total assets of $2,000,000. What is the Return on Equity? (Use the DuPont Identity)
*February 9, 2014*

**Geometry**

Jason wants to walk the shortest distance to get from the parking lot to the beach. a.How far is the spot on the beach from the parking lot? b. How far will he have to walk from the parking lot to get to the refreshment stand?
*February 1, 2014*

**math algebra**

3 < 4 – 2x
*January 27, 2014*

**Chemistry **

Calculate the heat given off when 177 g of copper cools from 155.0 c to 22.0 c. The specific heat capacity of copper is 0.385 j/g c
*January 23, 2014*

**Statistics**

In an essay of 250-500 words, thoroughly address the following items and respond to the related questions: 1.Define the term standard deviation. Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from ...
*January 23, 2014*

**physics**

Which of the following was explained by the Bohr atom? 1. atomic spectra 2. the fact that most of the mass of an atom is in the nucleus 3. nuclear fission 4. the photoelectric effect
*January 22, 2014*

**Maths**

prove that 2+2=5
*January 9, 2014*

**Math**

For the integers from 1 to 1000, how many multiples of 9 are also multiples of 6?
*January 2, 2014*

**Math**

I don't get what you mean?
*January 2, 2014*

**Math**

Bob the builder has many sticks of length 3, 5, and 7. He wants to form triangles whose edges consist of exactly 1 stick. How many non-congruent triangles can he form with the sticks?
*January 2, 2014*

**Algebra**

What is the sum of all coefficients of the polynomial? f(x)= (3x^3 - 3x - 1)^38 * (2x+1)^4 * (x^4 - 3x^2 + 5x - 2)^77
*November 25, 2013*

**math**

I think term 55 but I am not sure what that proves or if it shows you the answer?
*November 25, 2013*

**Physics**

X rays bombarding heavy atoms can be used to eject electrons from the 1s shell in atoms; indeed, this is the starting point for Moseley’s experiments. Estimate the maximum wavelength of pho- tons required to eject an electron from the 1s shell of copper, for which Z = 29...
*November 21, 2013*

**Physics**

A 100-watt bulb becomes warm and glows brightly enough to light a small room. On the other hand, a 100-watt laser can cut holes in steel and would not be effective at lighting a small room. What is true about the light coming from these two sources that accounts for these dif...
*November 21, 2013*

**Social Science**

I have to conduct a project that will be time consuming and costly and I need to justify to my principal investigator why he should approve the funding for this project.
*November 15, 2013*

**Phsyics**

How might they use spectroscopy to deter- mine the atmospheric composition of these planets? 1. None of these 2. By analyzing the spectrum of the surface of the planets. 3. All of these 4. By analyzing the molecules that compose the planets. 5. By analyzing the spectrum of the...
*November 13, 2013*

**english **

unscramble the words in the following sentence to write sensible sentences : underline common noun the was about One an West old outlaw film in.
*November 7, 2013*

**chemistry**

N2 + 2O2 -->2 NO2 Suppose 31.25 g of N and 44.0 G of O react A. Calculate the mass of Nitrogen Dioxide formed. B. Which reactant is the limiting reactant? C. Calculate the mass of the excess reactant left after the reaction. D. Find the % yield if 52.3 g of NO2 is produced.
*October 30, 2013*

**physic**

A 2.25kg book is dropped from a height of 2.5m what is the acceleration?
*October 22, 2013*

**Physics**

Two ice skaters, Daniel (mass 70.0kg ) and Rebecca (mass 45.0kg ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 14.0m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 6.00m/s...
*October 17, 2013*

**Physics**

A 4.2 g bullet leaves the muzzle of a riﬂe with a speed of 372.4 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the riﬂe? Answer in units of N
*October 15, 2013*

**Math**

The admission fee at an amusement park is 1.5 dollars for children and 4 dollars for adults. On a certain day, 294 people entered the park, and the admission fees collected totaled 716 dollars. How many children and how many adults were admitted
*October 9, 2013*

**Algebra**

A man invests his savings in two accounts, one paying 6 percent and the other paying 10 percent simple interest per year. He puts twice as much in the lower-yielding account because it is less risky. His annual interest is 418 dollars. How much did he invest at each rate?
*October 9, 2013*

**Vocabulary Studies**

Imagery is figurative language that evokes mental pictures, usually by appealing to our five senses. Imagine that you are standing on the beach in the picture. Write a paragraph of at least 5 complete sentences using imagery to describe your imagined experience. Use at least 3...
*September 28, 2013*

**Chemistry**

Table salt, NaCl, and sugar C12H22O11 are accidentally mixed. A 5.50g sample is burned and 3.60g of CO2 is produced. What was the mass percentage of the table salt mixture?
*September 23, 2013*

**Vocabulary Studies**

Imagine that you are standing on the beach in the picture. Write a paragraph of at least 5 complete sentences using imagery to describe your imagined experience. Use at least 3 examples of language that appeals to your 5 senses: taste, touch, hearing, sight, and smell
*September 22, 2013*

**Physics 2**

A 1.00-L insulated bottle is full of tea at 88.0°C. You pour out a mug of tea and immediately screw the stopper back on the bottle. Find the change in temperature of the tea remaining in the bottle that results from the admission of air at room temperature. (Let the room ...
*September 17, 2013*

**Physics 2**

A 1.00-L insulated bottle is full of tea at 88.0°C. You pour out a mug of tea and immediately screw the stopper back on the bottle. Find the change in temperature of the tea remaining in the bottle that results from the admission of air at room temperature. (Let the room ...
*September 17, 2013*