Sunday

July 5, 2015

July 5, 2015

Total # Posts: 520

**physics**

An 0.90 kg object is attached to one end of a spring, and the system is set into simple harmonic motion. The displacement x of the object as a function of time is shown in the drawing. With the aid of these data, determine the following values. I got a,b,d,e right. for C, I ...
*July 4, 2015*

**physics**

Damon, help me!!! =(
*July 4, 2015*

**physics**

When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 5.60 10-7 m and a maximum speed of 2.82 10-3 m/s. I don't see how A and a, is given. =/
*July 4, 2015*

**physics**

thank you! =)
*July 4, 2015*

**physics**

A hand exerciser utilizes a coiled spring. A force of 82.0 N is required to compress the string by 0.0191 m. Determine the force needed to compress the spring by 0.0520 m.
*July 4, 2015*

**physics**

i got it! thank you!! =)
*July 2, 2015*

**physics**

please help me!
*July 2, 2015*

**physics**

Physics Genius! please let me! Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 6.12 rad/s. The mass m of each object and its perpendicular distance r from the z axis are as follows: (1) m1 = 6.36 kg and r1 = 2.20 m, (2) m2 = 3.92 kg ...
*July 2, 2015*

**physics**

A ladder (ℓL = 7.50 m) of weight WL = 350 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose ...
*July 2, 2015*

**physics**

A motorcyclist is traveling along a road and accelerates for 4.45 s to pass another cyclist. The angular acceleration of each wheel is +6.35 rad/s2, and, just after passing, the angular velocity of each wheel is +75.6 rad/s, where the plus signs indicate counterclockwise ...
*June 28, 2015*

**physics**

The drive propeller of a ship starts from rest and accelerates at 2.95 10-3 rad/s2 for 2.05 103 s. For the next 1.90 103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30 10-3 rad/s2 until it slows (without reversing direction) to an angular ...
*June 28, 2015*

**physics**

I keep on getting the second part wrong. Can you please tell me where I messed up? Thank you. The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires the gun, she is driven back over the edge and into the sea. ...
*June 26, 2015*

**Biology ( Ms.Sue help)**

They can pass down either an A or B allele, which would mean their child could only be A, B, or AB. If the other parent is type O, the child's blood type will be the allele he/she got from the AB parent. A child can only be O if it inherits an O allele from BOTH parents.
*June 25, 2015*

**physics**

I have no idea. Please help. Thank you. The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x coordinate ...
*June 25, 2015*

**physics**

I have no way to solve this question. help me please The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x...
*June 24, 2015*

**physics**

A projectile of mass 1.000 kg is shot straight up with an initial speed of 23.0 m/s. (a) How high would it go if there were no air resistance? i got 26.99, which is correct (b) If the projectile rises to a maximum height of only 17.8 m, determine the magnitude of the average ...
*June 21, 2015*

**physics**

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have ...
*June 21, 2015*

**physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is thirty-four times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites. Thank you!
*June 21, 2015*

**physics**

A 30-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 205 J from 435 J. How high does she rise during this interval? Neglect air resistance.
*June 21, 2015*

**physics**

A 54.5-kg skateboarder starts out with a speed of 1.95 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the ...
*June 21, 2015*

**physics**

A 50-kg box is being pushed a distance of 6.4 m across the floor by a force P with arrow whose magnitude is 154 N. The force P with arrow is parallel to the displacement of the box. The coefficient of kinetic friction is 0.24. Determine the work done on the box by each of the ...
*June 21, 2015*

**Chemistry**

Determine the entropy change when 1.80 mol of HBr(g) condenses at atmospheric pressure? I got that DeltaS fus = 12.922J/(k*mol) Delta S Vapour = 93.475J/(K*mol) the only thing I don't get is the entropy change when 1.80 mol of HBr(g) condenses at atmospheric pressure. How ...
*May 27, 2015*

**Chemistry**

what is the freezing point of an aqueous solution that boils at 102.1 C? Kf=1.86 Kb=0.512 102.1-100.0=2.1 2.1/0.512=4.10 4.10*1.86=7.62 C 7.62 C Is this correct?
*May 22, 2015*

**L A/The Giver**

The answer is C. Jonas escapes and is on the run with Gabriel. Falling action does mean when the story is calm, but it doesn't nessarly mean that. It is the ending of the story... What happened at the end.
*May 20, 2015*

**Calculus **

What is the derivative of tan(1-x)^(1/2)?
*May 6, 2015*

**Language Arts**

These are all wrong! The answers are not correct.
*April 23, 2015*

**Math**

Isn't 51 divisible by 3 and 17?
*April 22, 2015*

**Math**

Ohhhh! Thank you!
*April 22, 2015*

**Math**

I don't really understand that, doesn't b have a five in there?
*April 22, 2015*

**Math**

Without using a calculator, decide which of these numbers divide into 2^5 * 3^9 * 7^2 * 13^5 8 17^4 * 19 with no remainder. Explain how you know. a) 2^4 * 3^8 * 7^2 * 13^4 * 17^4 * b) 2^5 * 3^2 * 5 * 7^2* 17 c) 2^4 * 13^4 * 17^4 * 19^4 d) 2^2 * 3^5 * 7 * 13^3 * 17^2 * 19
*April 22, 2015*

**Life orientation**

Factors that could threaten or limit core functions of the media
*April 4, 2015*

**Math**

So, my teacher wants me to sketch the graph of a system of inequalities but I'm not sure how. Can someone help me? Thank you! 3x + 2y < 6 x > 0 y > 0
*March 12, 2015*

**AP Chem**

Do i use Ka or Kb?
*March 9, 2015*

**AP Chem**

What is the ph of a .05 L solution containing .075 mol NH3 and 6.80 g of NH4+ when .025 L of 2 M is added to it? Kb= 1.8 x10^-5
*March 9, 2015*

**AP CHEM LAB**

How much .25 molar NAOH would you need to add to 50 mL of 2.85 molar HCl to reach the equivalence point?
*March 3, 2015*

**Chemistry Equilibrium**

1.15 g oh h2O (density 1.00 g/ml) is introduced into an empty 1.00 L container. The seled container is heated to 412 K and .150 moles of O2 (g) is present at equilibrium. A. Wrte the equilibrium expression for the reaction above. B. Calculate the equilibrium concentration (in ...
*February 26, 2015*

**Science**

A boy and girl sit on a seesaw of length 4m, balanced at its center. The girl sits at the far end and has a mass of 50kg. The boy is twice as heavy as the girl, and therefore sits midway between his end and the center. Then the girl is given a bag of oranges weighing 5kg, and ...
*February 23, 2015*

**PLEASE CHEM**

sorry this is in basic solution
*February 14, 2015*

**PLEASE CHEM**

wouldnt h2o be on the other side because you orignally have 2h20 on the products and one h20 in the reactants so cancelling them out would make one h20 on the products side
*February 14, 2015*

**PLEASE CHEM**

balance the redox reaction NO2^- + Ag^+ = NO3^- + Ag
*February 14, 2015*

**algebra**

Translate into algebraic exxpression one third of difference betwen 6 andp is added to 8
*February 13, 2015*

**Algebra**

translate the give fhrase into algebraic expresion 7 less than sum of 3 and x divided by 5
*February 13, 2015*

**Math**

Directions: Find all solutions of the equation in the interval (0, 2pi) sin x/2=1-cosx
*February 3, 2015*

**chemistry**

C6H12 = 9O2 --> 6CO2 = 6H2O + 3,690 kJ *Personally Balanced* What quantity of heat is produced if 32g of cyclohexane react with 95 L of oxygen at STP? *My work so far is below* 95L*(1 mol O2/22.4L) = 4.2 mol O2 What would be the next motive?
*January 21, 2015*

**social studies**

i think idk
*December 3, 2014*

**biology**

which is true about the inside of a cell? -the inside of an animal cell contains structures that carry out specific jobs for the cell, but no water or molecules dissolved in water -the inside of an animal cell contains water, molecules dissolved in the water and structures ...
*December 1, 2014*

**math**

how i make triangular prism,the dimensions are 6 unit base and 6 unit height,but the entire prism has height of 15 unit
*November 25, 2014*

**Math Help**

The number y of daily fee golf facilities in the United States from 1995 to 2003 can be represented by the following model where t represents the year with t = 5 corresponding to 1995. y=4381+1883.6lnt 5=t=13 During which year did the number of daily fee golf facilities reach ...
*November 12, 2014*

**chemistry**

The reaction between sodium hydroxide and hydrobromic acid is represented in the equation below: OH- + H+ -> H2O A 62.5 mL sample of 1.86 M NaOH at 22.5 deg Celsius was mixed with 62.5 mL sample of 1.86 M of HBr at 22.5 deg Celsius in a coffee cup calorimeter. The ...
*November 2, 2014*

**Organic Chemistry**

Calculate the partition coefficient of caffeine in water/methylene chloride from the following data: 10.3 g/100 mL for methylene chloride and 2.04 g/100 mL for water. Using the same data a student follows our procedure and extracts the caffeine using 3 extractions of 7 mL of ...
*October 31, 2014*

**Organic Chemistry**

In a very controlled experiment, a student is sure that 0.500 grams of caffeine is dissolved in 125 mL of water. The student extracts the caffeine using a single extraction of 21 mL of methylene chloride. How much caffeine is in the methylene chloride? How much remains in the ...
*October 31, 2014*

**Derivatives**

Could you perhaps do one of the ones on the bottom that are not in fraction form, cause I have a hard time doing the ones that have cos,sin,sec, and tan in them.
*October 22, 2014*

**Derivatives**

Oh okayyyyyyyy, I see it now, thanks
*October 22, 2014*

**Derivatives Help**

..I'm not sure I understand
*October 22, 2014*

**Derivatives **

Can you help me find the derivative of these problems...Every time I try doing these I don't get the right answer. All of these are fractions; (x)/(2+x)= (x^2+3)/(x^3-2)= (2π)/(x^2-x)= These are not fractions; (3x^3/2 tanx)= (3x^1/2 sinx)= (4secx tanx)= (x^2 cotx)= (x...
*October 22, 2014*

**english**

I did read it! The article was about people from south america are illegally coming to america by passing the border of mexico to texas.Then it talks about solutions of making people stop coming and mini stories of people who illegaly did it
*October 9, 2014*

**english**

please give me an example please
*October 9, 2014*

**english**

lets say a article talks about crossing the border of mexico illegally. Maybe i could say this reminds me about going to a country bout on a airplane and then i would have to explain why i think this
*October 9, 2014*

**english**

i still dont understand
*October 9, 2014*

**english**

what does it mean when the question is asking you ¨what was something that ¨stuck with you¨ during the reading of this article? explain." thanks
*October 9, 2014*

**Math**

Can someone tell me if I have this right? Thanks! Question: P varies directly as Q can be written as P = kQ. True Or False. My answer: True
*October 3, 2014*

**math**

24 by 15
*October 1, 2014*

**Physics I**

Ok thank you.
*September 21, 2014*

**Physics I**

Isn't gravity going upward positive and if it's downward then it would be negative? That's what my teacher told me but I'm pretty sure he said the answer was D too.
*September 21, 2014*

**Physics I**

A ball has been thrown upward. Which of the following is true while the ball is on the way up, after the ball has been released, assuming no air resistance? a. The acceleration is upward. b. The acceleration is zero. c. The ball's speed increases by 9.81 m/s each second. d...
*September 21, 2014*

**biology**

Please can i have a list of sone adaptive features of terrestrial plants. Please
*September 9, 2014*

**chemistry**

Please can i have a list of adaptive features of terrestrial plants. Please
*September 9, 2014*

**Identify the regular verb or verb phrase **

In the Middle Ages, students learned from priests and other church officials.
*July 24, 2014*

**PHYSİC**

A standard CD has a diameter of 12.0 cm, and a hole that is centered on the axis of symmetry and has a diameter of 1.50 cm. The CD’s thickness is 1.2 mm, and it's mass is 17 g. If a (very thin) pin extending through the hole of the CD suspends it in a vertical ...
*July 12, 2014*

**Physics**

A 1 kg hockey puck is sliding on the ice at 5m/s and stops on some dirt in 2 secs. I need to find the coefficient of kinetic friction. I found the acceleration being -2.5m/s^s (0-5m/s / 2s) Idk what to do next pleaseeee help
*June 1, 2014*

**Chemistry**

No other equations are provided however the question goes on to ask if enough N2O4(g) is placed in a container to achieve 1.00 atm of pressure at this temperature, predict what the final pressures of each of the gasses will be.
*May 18, 2014*

**Chemistry**

Please help! I can't seem to set this up right At any given temperature 2NO(g) + O2(g) <-> 2NO2 kp=1X10^4 2NO2(g) <-> N2O4 kp=1X10^-1 Find the kp 2NO(g) < -> O2(g) + N2(g) kp=?
*May 18, 2014*

**chemistry**

a 2.00 L ballon at 25 degrees celcius and 745mmHg floats on an altitude where the temperature is 10 degrees celcius and the air pressure is 700mmHg. what is the new volume othe balloon
*May 8, 2014*

**life orientation**

I don't knw
*April 27, 2014*

**math**

input:0;1;2;3 outpu2:4;2;0;-2 wht is the formula#stressed:|
*April 21, 2014*

**math**

the equation is y=2exponent(x)+2 determine the input value if y=34
*April 21, 2014*

**trig/ vectors**

Points C and D are directly across from each other on opposite banks of a river. A boat travels across the river directly from point c to point d at a speed of 12 mph. If the current of the river has a speed of 4 mph, at what angle, and speed, must the captain head to travel ...
*April 13, 2014*

**fitness and health**

I would say carrots
*April 9, 2014*

**Statistics**

1,037 it is simple math.
*April 9, 2014*

**SCIENCE PLEASE HELP ME!!!!!!!! ASAP PLEASE PLEASE**

it is A stupid
*April 9, 2014*

**science(check answers)**

anonymous is correct
*March 31, 2014*

**Math**

Find an Equation for the least squares line then use it to find the missing value. (400, 50) (500, 65) (500, 70) (600, 80) (700, 85) (800, 95) (550, Y) Interpolate I think the least squares line is y= .10538X+ 12.6923 Could someone verify and please instruct me how to complete...
*March 20, 2014*

**Math: Statistics Least squares line**

Find an equation of the least squares line, then use it to complete the table. X- 111 169 230 287 335 ? Y- 2 3 4 5 6 7 Extrapolation I missed the lesson on this and as far as I can tell I think the least squares line is y= .01764x+ .oo693 If anyone could verify my line and and...
*March 19, 2014*

**math **

a 5% acid solution is mixed with a 9% acid solution. How many ounces of each solution are needed to obtain 40 ounces of a 6% solution?
*February 27, 2014*

**algebra**

xdss
*February 19, 2014*

**Science**

Hey can you help me with those! :P
*February 6, 2014*

**physics**

An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30.°C. How many molecules are there in the gas? 6.1 × 1023 6.0 × 1022 2.4 × 1022 2.3 × 1023
*February 4, 2014*

**Physics**

The molecular mass of oxygen molecules is 32, and the molecular mass of nitrogen molecules is 28. If these two gases are at the same temperature, the ratio of nitrogen's r m s speed to that of oxygen is: (8)1/2:(7)1/2 8:7 (7)1/2:(8)1/2 7:8
*February 4, 2014*

**Physics**

sadadfa
*February 3, 2014*

**Math**

Estimate the total number of years of service of 200 factory workers based on a sample size of n=5 where the years of service reported are 12, 8, 20, 5, 12
*February 3, 2014*

**Math**

In one hour, a factory packaged 150 boxes of light bulbs. Estimate the total number of defective light bulbs packaged that hour based on a sample of 8 boxes containing the following numbers of defective bulbs: 5, 3, 5, 1, 2, 9, 4, 3
*February 3, 2014*

**Algebra 1A **

What are the four steps for solving a problem?
*January 29, 2014*

**trig**

Wow I feel stupid. Lol thanks tho!
*January 16, 2014*

**trig**

I did but I got lost :(
*January 16, 2014*

**trig**

And show work please!
*January 16, 2014*

**trig**

simplify (1-cot^2x sec^2x) / ( cot^2x)
*January 16, 2014*

**trig**

simplify (1-cot^2x sec^2x) / ( cot^2x)
*January 16, 2014*

**econ/business**

Last month, Sue, of Sue's Sandwiches, sold $3,000 worth of product (sandwiches and sodas) from her sidewalk cart to 300 customers. She spent $600 on the sandwich ingredients and buying the sodas wholesale. Her monthly costs are the following: Utilities = $60, Salary = $1,...
*November 20, 2013*