Wednesday

January 28, 2015

January 28, 2015

Total # Posts: 3,235

**Math**

Mike and John ordered 2 pizzas. Mike ate 1/2 of his pizza and John ate 1/2 of his. How much did they eat altogether?
*January 9, 2013*

**Physics**

A 5000 kg African elephant has a resting metabolic rate of 2500 W. On a hot day, the elephant's environment is likely to be nearly the same temperature as the animal itself, so cooling by radiation is not effective. The only plausible way to keep cool is by evaporation, ...
*January 3, 2013*

**Financial management**

ABC Construction and Leasing Company are interested in investing in the residential real estate market due to a relatively low interest rate environment. The Company appointed you to be in charge of the project feasibility study. You have just visited a 35-year old, well-...
*January 1, 2013*

**chemistry**

How many Joules are required to heat 2 g of silver from 50 ◦ C to 70 ◦ C?
*December 17, 2012*

**chemistry**

A 100 g sample of an unknown liquid absorbs 2000 J of heat energy, raising the liquid’s temperature from 50 ◦ C to 70 ◦ C . What is the speciﬁc heat capacity of this liquid? No phase change took place.
*December 17, 2012*

**chemistry**

A 100 g sample of a liquid with a speciﬁc heat of 2 J/g · C absorbs 4000 J of heat energy. If the sample started at 30 ◦ C , what is the ﬁnal temperature? No phase change took place.
*December 17, 2012*

**chemistry**

Step 1: (0.5*8180.0 - 8180.0)/ (390.5 - 8180.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=96.5 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)
*December 15, 2012*

**chemistry**

I got the right answer :)
*December 15, 2012*

**chemistry**

You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 390.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of...
*December 15, 2012*

**chemistry**

A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.53 kg m-3. Under these conditions the total surface area of the balloon is 0.2 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
*December 15, 2012*

**Chemistry**

IV)Wrong !Neither will work, UV light will be able to pass through both of them if visible light is able to pass through as well.
*December 14, 2012*

**I really need help in science please anyone thanks**

Since fermentation occurs in the cytoplasm of yeast cells explain the role of mitochondria in yeast cells ? If anyone can help me this I will truly be graceful
*December 13, 2012*

**science**

1.75 cm that is the correct one
*December 8, 2012*

**MATH**

Whats 4 and 5
*December 7, 2012*

**Physics--please please i need help!**

A Ladder of length L and mass m leans against wall at angle theta from the vertical. The wall is smooth so that only horizontal force N is exerted on the top of the ladder. A fireman of mass M climbs a distance d upward as measured along the ladder. (a): Assuming the ladder ...
*December 6, 2012*

**Physics**

A Ladder of length L and mass m leans against wall at angle theta from the vertical. The wall is smooth so that only horizontal force N is exerted on the top of the ladder. A fireman of mass M climbs a distance d upward as measured along the ladder. (a): Assuming the ladder ...
*December 6, 2012*

**math**

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. How many are not using any of the three? 35 said they drove alone. 35 rode in a carpool. 30 rode public transportation. 3 used both carpools and public ...
*December 5, 2012*

**math**

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. 43 said they drove alone. 34 rode in a carpool. 28 rode public transportation. 4 used both carpools and public transportation. 7 used both a carpool and sometimes ...
*December 5, 2012*

**Math**

In a recent survey of 100 women, the following information was gathered. 52 use shampoo A. 31 use shampoo B. 39 use shampoo C. 11 use shampoos A and B. 13 use shampoos A and C. 15 use shampoos B and C. 10 use all three. How many are using shampoo A only? ___ Using the Venn ...
*December 5, 2012*

**Alegbra I HELP!**

Write an equation for a line to represent this situation. Time(min) 5 10 15 20 25 Charged $8 $13 $18 $23 $28
*December 5, 2012*

**Physics **

Determine the fuel needed to safely land a spacecraft. Start at y = 100km. Landing is y = 0km. Vy < 25 m/sec is a safe landing speed. g = -1.354 m/s^2 Acceleration due to thrust (where fuel used is 100 kgs*Ay-thrust Amax = 30 m/s^2 Amin = 5 m/s^2 What I dont understand is ...
*December 4, 2012*

**math**

An airplane flew 1500 miles in 2.5 hours. How many kilometers is this per hour
*December 4, 2012*

**Physics**

A projectile is fired at v0 = 394.0 m/s at an angle of θ = 68.7o with respect to the horizontal. Assume that air friction will shorten the range by 28.1%. How far will the projectile travel in the horizontal direction, R?
*December 2, 2012*

**Math**

What would the LCD be between x^2, 4x, and 6? Here is the problem: 1/x^2+3/4x-5/6
*December 2, 2012*

**physics**

A 14.0-kg chair is at rest on a flat floor. The coefficient of static friction between the chair and the floor is 0.450. A person tries to move the chair by pushing on the chair with a force directed at an angle of 30„a below the horizontal. What is the minimum force that...
*December 2, 2012*

**physics**

A 14.0-kg chair is at rest on a flat floor. The coefficient of static friction between the chair and the floor is 0.450. A person tries to move the chair by pushing on the chair with a force directed at an angle of 30„a below the horizontal. What is the minimum force that...
*December 2, 2012*

**physics**

A 70.5 football player is gliding across very smooth ice at 2.25 . He throws a 0.430 football straight forward.
*December 2, 2012*

**Physics HW Help, Please**

What is the energy required to accelerate a 1600 kg car from rest to 33 m/s?
*December 1, 2012*

**Business**

I forgot my class notes and I can;t find this acronym in my book. Can someone please tell me what the acronym C.L.A.S.S. stands for. I looked it up on an acronym website but has way to many. Thanks
*November 30, 2012*

**calculus**

A conical water tank with vertex down has a radius of 12 feet at the top and is 23 feet high. If water flows into the tank at a rate of 20 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 17 feet deep?
*November 30, 2012*

**Physics, Please Help**

A 2130-kg space station orbits Earth at an altitude of 455 km. Find the magnitude of the force with which the space station attracts Earth. The mass and mean radius of Earth are 5.98 × 1024 kg and 6370 km, respectively.
*November 29, 2012*

**Physics**

Thiiiis question. Okay, so the only two formulas you need are: 1) dsinθ=mλ 2) y=Ltanθ You already have all of your variables: d=5.35x10^-6m m=3 L=2.51m λ_blue=4.25x10^-7m λ_red=6.40x10^-7m So now, just sub your values into formula 1 to find θ_blue...
*November 29, 2012*

**chemistry**

The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 2.591×10−3 M−1s−1. What is the initial rate of reaction in a reactor ...
*November 29, 2012*

**chemistry**

8028.84
*November 29, 2012*

**Physics Quesion**

A .140 kg baseball is thrown with a velocity of 41.4 m/s. it is struck with an average force of 5000N, which results in a velocity of 37 m/s in the opposite direction. How long were the bat and ball in contact?
*November 28, 2012*

**Physics**

An object is placed 10 cm in front of a convex mirror of focal length 4 cm. Find the image location by drawing a ray tracing diagram to scale. Verify your answer using the lens equation.
*November 28, 2012*

**Physics, Please Help**

Thank you!!
*November 25, 2012*

**Physics, Please Help**

A homeowner is trying to move a stubborn rock from his yard which has a mass of 1025 kg. By using a lever arm (a piece of wooden board) and a fulcrum (or pivot point) the homeowner will have a better chance of moving the rock. The homeowner places the fulcrum 24.4 cm from the ...
*November 25, 2012*

**Physics**

A seasoned mini golfer is trying to make par on a tricky hole #5. The golfer can complete the hole by hitting the ball from the flat section it lays on, up a 45° ramp launching the ball into the hole which is d = 1.60 m away from the end of the ramp. If the opening of the...
*November 24, 2012*

**Physics**

For #3, I put B. I dunno if it's the same for everyone's (since it's MC)
*November 23, 2012*

**Physics**

Oh, btw, did you figure out questions 4,5, or 7?
*November 23, 2012*

**Physics**

Just figured this one out! Okay, so: The frequency of the pipe(f_p), and of the string (f_s) are both the same, since frequency is source dependent. f_p=f_s Now, f_p=n(v_snd/4L_p) where n is 1 since the wave corresponds to the pipe's fundamental (first) frequency, v_snd is...
*November 23, 2012*

**Physics**

Hmmm well I've tried it and, for what it's worth, the way that drwls has done it is right.
*November 22, 2012*

**math**

Find the values of a,b, and c if the parabola y=a(x^2)+bx+c is tangent to the line y=-2x+3 at (2,-1) and has a critical point when x=3
*November 22, 2012*

**physics 209**

A mass m = 0.5 kg is hung from a pulley with moment of inertia I = 0.20kg⋅m2 and radius R = 10cm. There is friction in the pulley. The mass is dropped from rest, and after 2s it traveled 0.4m. What is the torque due to friction?
*November 19, 2012*

**chem**

which of the following has the highest internal energy , Lake Michigan in the winter at 0 degress celcius or a lighted match at 850 degress celcius? I think it is lake michigan because it is so much larger but i am not sure.
*November 18, 2012*

**Stats**

Recently, a price war has developed among retailers selling Brand X denim jeans. A major chain buyer wishes to estimate the mean price of these jeans during this period to compare it to the normal selling price of $20.00. A random sample of 7 major retailers produces a mean ...
*November 16, 2012*

**Physics**

Sorry about not replying last time! I figured this one out though. The solution can be found by: vf=√[(v0^2)+(2GM/rf)-(2GM/r0)]
*November 15, 2012*

**Physics Please Help!!**

Two speakers, A and B, are emitting identical, synchronized (in-phase) sound waves at 240kHz. A person standing a point C hears a relatively loud sound. She then starts walking towards point D, and notices the sound gets quieter, reaching a minimum when she arrives at D. The ...
*November 14, 2012*

**Physics**

Just asking, but did you figure out question 2? The one with the massive uniform cylindrical pulley?
*November 14, 2012*

**math**

number sense- What two simpler problems can you use to find 9 x 38?
*November 14, 2012*

**Math**

The largest multi-story building built by the Anasazi Indians called the Pueblo Bonito. The shape of its foundation is nearly parabolic, with a base (at the top of the photo) of about 500 feet and a height of about 300 feet. 1. Sketch the multistory building on a coordinate ...
*November 14, 2012*

**Stoichiometry**

How many grams of oxygen are required to completely burn 85.6 grams of methane (CH4)? CH4 + O2 → H2O + CO2
*November 14, 2012*

**Statistics**

Which, if any, of the values listed below for a correlation coefficient indicate a situation where more than half of the variation in one variable is associated with variation in the other variable? -.7 1 .3 .6 .9 I was thinking B
*November 12, 2012*

**Physics**

A 500 g block on a frictionless surface is attached to a rather limp spring of constant k = 8.7 N/m. A second block rests on the first, and the whole system executes simple harmonic motion with a period of 3.1 s. When the amplitude of the motion is increased to 60 cm, the ...
*November 11, 2012*

**early child education**

what does the word docile mean
*November 11, 2012*

**Calculus**

ln(x+8)+ln(x–8)=0 x=?
*November 9, 2012*

**Chemistry**

Turns out the correct answer was just B) NaF(aq)
*November 8, 2012*

**Chemistry**

For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Answered the hint in Mastering Chem & looked over the book and I still have no idea. Check all that apply: A) NiF_2(aq) B) NaF(aq) C) NiI_2(aq) D) NaI(aq) E) CuBr(aq)
*November 8, 2012*

**physics**

A 2130-kg space station orbits Earth at an altitude of 455 km. Find the magnitude of the force with which the space station attracts Earth. The mass and mean radius of Earth are 5.98 × 1024 kg and 6370 km, respectively
*November 7, 2012*

**fractions from least to greatest**

can you put 5/2 ,15/8, 2 5/8, 7/8 in order from least to gratest
*November 7, 2012*

**Statistics**

The residual sum of the squares is the numerator portion of the formula for the variance of y about the regression line. True False
*November 6, 2012*

**Statistics**

To conduct a valid regression analysis, both x and y must be approximately normally distributed. True False
*November 6, 2012*

**Statistics**

To conduct a valid regression analysis, both x and y must be approximately normally distributed. True False
*November 5, 2012*

**Statistics**

The residual sum of the squares is the numerator portion of the formula for the variance of y about the regression line. True False
*November 5, 2012*

**chem**

how many gramss of HCl to dassolve 2,5 g Fe in a lock and how much H_2 would be produced Fe(s)+2HCl(aq)-FeCl_2(aq)+H_2(g)
*November 5, 2012*

**physics**

A car weighing 2000 lbs is parked on a hillside in San Francisco at an angle of 55o (relative to the ground). Approximately what is the minimum coefficient of static friction necessary to keep the car from sliding downhill?
*November 3, 2012*

**Physics **

You push along a handle down toward a sled to move it across the snow. The handle is at an angle with the horizontal. As you increase the angle the handle makes with the horizontal,(steeper angle), what happens to the normal force the ground exerts on the sled?
*November 3, 2012*

**english**

2. The broadest type of search, which looks for your terms anywhere, is a/an _______ search. A. subject B. title C. author D. keyword
*November 3, 2012*

**PHYSICS**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 10.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? The Ans is 0.707 kg m/sec I do not know how ...
*October 31, 2012*

**PHYSICS**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 10.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? The Ans is 0.707 kg m/sec I do not know how ...
*October 31, 2012*

**calculus**

the region bounded by the quarter circle (x^2) + (y^2) =1. Find the volume of the following solid. The solid whose base is the region and whose cross-sections perpendicular to the x-axis are squares.
*October 28, 2012*

**calculus**

(Use the fact that the kinetic energy of a particle of mass "m" moving at a speed "v" is (1/2)m(v^2). Slice object into pieces in such a way that the velocity is approximately constant on each piece.) Q: Find the kinetic energy of a phonograph record of ...
*October 28, 2012*

**calculus**

(Use the fact that the kinetic energy of a particle of mass "m" moving at speed "v" is (1/2)m(v^2). Slice objects into pieces in such a way that the velocity us approximately constant on each piece.) Q: Find the kinetic energy of a rod of mass 10kg and ...
*October 28, 2012*

**chemistry**

calculate the change in pH when 9.00ml of 0.100M HCl(aq) is added to 100.0mL of a buffer solution that is 0.100M in NH3(aq) and 0.100M NH4Cl(aq). ...Calculate the change in pH when 9.00,L if 0.100M NaOH(aq) is added to the original buffer solution.
*October 28, 2012*

**Physics**

I don't wanna write it all out so I'll just give you the general formula. #2: vf=√[2*(m_1gLsinθ-m_2gL-0.5kL^2-μkm_1gcosθL)/(m1+m2)] Just to be clear, all of those values^^^ are under the square root sign. #4: v1f=[(v1)(m_1-m_2)/(m_1+m_2)]+[(v2)2m_2...
*October 25, 2012*

**Science**

Question: The greatest expansion of water occurs when: isn't it when it turns to ice?? The other answers are at 4C it gains temperature or at 4C it loses temperature. In the winter the pipes can break because the water in them freezes thats why I thought it was that. Thanks
*October 24, 2012*

**Physics**

A 5.57-kg object passes through the origin at time t = 0 such that its x component of velocity is 5.25 m/s and its y component of velocity is -3.15 m/s. (a) What is the kinetic energy of the object at this time? (b) At a later time t = 2.00 s, the particle is located at x = 8....
*October 23, 2012*

**trig**

Show that the height, h, of the A-frame is equal to the expression 5sinc(1+2cosc). Im not sure what to do.
*October 22, 2012*

**Calculus**

Find the inflection points of f(x)=8x^4+46x^3-18x^2+1. (Give your answers as a comma separated list, e.g., 3,-2.) Please Help!!!!!
*October 22, 2012*

**Physics- PLEASE HELP**

Check out the Mike's Online Biology Blog where this is explained in a video lesson the address is freebiologyschool period blogspot periodcom
*October 15, 2012*

**chemistry**

4) An aqueous solution is 1.65 m glucose. What are the boiling point and freezing point of this solution?
*October 15, 2012*

**chemistry**

Through reacting with the other atom by sharing one electron
*October 15, 2012*

**Algebra**

Chris is x Matt is x+9 2x+9=20 2x=11 x=5.5 Chris = 5.5 Matt= 5.5+9 = 14.5 5.5 +14.5 = 20
*October 15, 2012*

**Physics**

An elevator weighing 10 000N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2 A) 7.0kN B) 10.0 kN C)11.6 kN D) 13.1 KN E) 40.0 kN
*October 15, 2012*

**Grammar**

A is correct.
*October 15, 2012*

**chemistry**

2) Toluene, C6H5CH3, is a liquid similar to benzene, C6H6. It is the starting material for other substances, including trinitrotoluene (TNT). Find the molality of toluene in a solution that contains 25.8 g of toluene and 135 g of benzene.
*October 15, 2012*

**university physics**

Two forces act on a 4.00-kg object in a manner that the object has an acceleration 3.00 m/s2 in a direction 20.0° north of east. The first force is 15.00 N in a direction 10.0° west of north. What is the second force?
*October 15, 2012*

**Chemistry**

repost, did you do 0.1201 * 0.005=6*10^-4, if so then you'd subtract this number from the one calculated in part 2 and there's your answer
*October 14, 2012*

**Chemistry**

Hey this is the same uoit lab I just completed and submitted, if you can tell me your value again for KLO3 (amount of mols) i'll be able to solve it for you
*October 14, 2012*

*****PLEASE SCIENCE******

Thank you for taking the time to answer...didn't thin temp wise. Have a good night.
*October 10, 2012*

*****PLEASE SCIENCE******

I have this question: Which is the smallest unit of measurement for temperature? One Celsius degree: one Kelvin:one Fahrenheit. I think it is Kelvin but I can't find anywhere in my book where it refers to that. When I google all three it says Celsius & Kelvin is the same. ...
*October 10, 2012*

**Science**

huh?????????????
*October 9, 2012*

**Science**

then wats the hypothesis
*October 9, 2012*

**Physics**

Please help!!! Physics test!? I have a physics test tomorrow on projectile motion, and I don't feel ready for it. I'm having trouble in the class and I need to ace this test. The problem is I get confused when I get a problem. I don't know how to proceed. After I ...
*October 9, 2012*

**Chemistry**

Transferrin (T) - Molar mass = 81000g/mol - carries 2 Fe3+ ions Deferrioxxamine B (DB) molar mass = 650g/mol - carries 1 Fe3+ at wavelength 428 molar absorptivity T = 3240 molar absorptivity DB = 2630 at wavelength 470 molar absorptivity T = 4370 molar absorptivity DB = 2190 A...
*October 8, 2012*

**Physics**

A blue car with mass mc = 410.0 kg is moving east with a speed of vc = 23.0 m/s and collides with a purple truck with mass mt = 1248.0 kg that is moving south with a speed of vt = 10.0 m/s . The two collide and lock together after the collision. 1)What is the magnitude of the ...
*October 8, 2012*

**chemistry**

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
*October 7, 2012*

**chemistry**

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
*October 7, 2012*

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