Sunday

March 29, 2015

March 29, 2015

Total # Posts: 222

**physics**

If 50 g of ice at −5 ◦C is mixed into 300 g of water at 60◦C in a completely insulated container, what is the final equilibrium temperature of the water? Why did we insist on the container being completely insulated?
*March 29, 2015*

**physics**

A spherical buoy of radius 25 cm and mass 8 kg sits in sea water of density 1025 kg/m3 . At low tide its anchoring chains have got tangled. What is the maximum tension force this chain may have to withstand at high tide? Assume calm conditions.
*March 29, 2015*

**Physics help**

Describe each type of item tested in terms of its V vs I being "Ohmic" or not. Use one sentence per item-type tested. Item types tested are Resistors, Coil, Diode, Capacitors, and Light Bulb.
*February 25, 2015*

**physics**

The coefficients of static and kinetic friction between a 43 kg box and a horizontal surface are 0.72 and 0.20, respectively. (a) What is the acceleration of the object if a 135 N horizontal force is applied to the box? (b) What is the acceleration if the applied force is 480 N
*February 23, 2015*

**Ecology**

under what conditions might phenotypic plasticity not evolve and why
*February 8, 2015*

**georaphy**

What state is located 20 degrees north latitude and 160 degrees west longitude:-)
*February 2, 2015*

**English**

All the fixed ones were correct for me:)
*January 26, 2015*

**physics**

An 94.4 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 29.6 m behind the ship, at rest relative to the spaceship. The only way to return to ...
*January 25, 2015*

**physics**

A 24.0 g marble sliding to the right at 60.8 cm/s overtakes and collides elastically with a 12.0 g marble moving in the same direction at 15.2 cm/s. After the collision, the 12.0 g marble moves to the right at 76 cm/s. Find the velocity of the 24.0 g marble after the collision.
*January 25, 2015*

**physics**

A 2100 kg car traveling at 12.0 m/s collides with a 2780 kg car that is initially at rest at the stoplight. The cars stick together and move 3.90 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
*January 25, 2015*

**Math**

A student borrowed $19,000 at an annual interest rate of 6.4%. Calculate the amount of interest due 3 months after the student has begin making payments
*December 9, 2014*

**Chemistry- URGENT please HELP**

NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, ...
*November 17, 2014*

**Algebra**

Find the complex zeros of the following polynomial function. Write f in the factored form. F(x)=2x^4-5x^3-20x^2+115x-52
*October 19, 2014*

**Statistics**

1 in 7750
*October 15, 2014*

**Algebra Help**

I think the center is (16/11,79/11) can anyone confirm this? also i think the radius is -2?
*September 24, 2014*

**Algebra Help**

How do I find the center of a circle using the points (2,8) (-4,6) (1,-1) I also found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And the Equation of the perpendicular bisector of the line between the second...
*September 24, 2014*

**Algebra! please help **

x^2+y^2+x-6y+9=0 Graph the circle using the center (h,k) and radius r. find the intercepts
*September 17, 2014*

**algebra**

It doesn't show you the steps though?
*September 17, 2014*

**algebra**

x^3-9x+1=0
*September 17, 2014*

**grammar**

How do I diagram the sentence "There were ten visitors here yesterday", especially the word "there"
*September 9, 2014*

**Algebra**

Thanks Steve!
*August 24, 2014*

**Algebra**

which is?
*August 24, 2014*

**Algebra**

find all points having an x-coordinate of 4 whose distance from the point (1,5) is 5
*August 24, 2014*

**NCCU**

11. What mass of sodium benzoate should be added to 160.0mL of a 0.17M benzoic acid solution in order to obtain a buffer with a pH of 4.30?
*June 21, 2014*

**algebra**

A single card is drawn from a standard deck of cards. Find the probability if the given information is known about the chosen card. A face card is a jack, queen, or king.
*May 26, 2014*

**Algebra 2**

if an object is thrown vertically upward with an initial velocity of v from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft t is in seconds and v is in ft/sec) If a rock is thrown upward from a height of 100ft, with an ...
*April 23, 2014*

**Chem**

THANKS. I figured it out.
*March 12, 2014*

**Chem**

how do i find the rate constant?
*March 12, 2014*

**Chem**

i got N=0.83 does the seem right?
*March 12, 2014*

**Chem**

suppose that you place exactly 100 bacteria into a flask containing nutrients for the bacteria and that you find the following data at 37 °C: t (min):0 15.0 30.0 45.0 60.0 Number of bacteria: 100 200 400 800 1600 What is the order of the rate of production of the bacteria...
*March 12, 2014*

**chemistry**

Hey Guys so I have this problem with ICE tables that is extremely confusing for me so I would love some help on it! At a Certain Temperature, the equilibrium constant for the reaction of NO with Cl2 is 6250. If the initial concentration of NOCl is 1.0M and that of NO 0.10M ...
*March 7, 2014*

**Spanish 2**

@SraJMcGin Was #2 correct also? Thanks! :)
*March 6, 2014*

**Spanish 2**

Fill in the blank with the correct imperfect form of the verb. Include accent marks when needed. 1.) Mis amigos______la playa. (ir) 2.) Mama______la casa. (limpiar) 3.) Mi hermano y yo____la leche.(beber) 4.) Yo_____la cena. (preparar) 5.) ¿Tú_____los libros? (...
*March 6, 2014*

**spanish 2**

Fill in the blank with the correct imperfect form of the verb. Include accent marks when needed. 1.) Mis amigos______la playa. (ir) 2.) Mama______la casa. (limpiar) 3.) Mi hermano y yo____la leche.(beber) 4.) Yo_____la cena. (preparar) 5.) ¿Tú_____los libros? (...
*March 5, 2014*

**Chem 2**

Thanks so so much! I was really confusing myself! The steps really helped!
*February 21, 2014*

**Chem 2**

Im sure i did this wrong but this is what i did deltaT=Kfm m=mols solute/ kg solvent 1.56g vitamin k/83.8g= 0.019 m=0.019/ 0.025 = 0.76
*February 21, 2014*

**Chem 2**

when Im getting my Kf do i change it from Celsius to Kelvin before i do my calculation?
*February 21, 2014*

**Chem 2**

Vitamin K is involved in normal blood clotting. When 1.56 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 5.23 °C. . Calculate the molar mass of vitamin K. I posted this yesterday but I got the wrong answer and could use ...
*February 21, 2014*

**Chem 2**

When i did the problem i got 0.76 but i think its wrong?
*February 20, 2014*

**Chem 2**

Vitamin K is involved in normal blood clotting. When 1.56 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 5.23 °C. . Calculate the molar mass of vitamin K.
*February 20, 2014*

**Chem 2**

When 3.89 g of a nonelectrolyte solute is dissolved in water to make 835 mL of solution at 26 °C, the solution exerts an osmotic pressure of 825 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of ...
*February 20, 2014*

**algebra**

the larger of two numbers is 12 mo're than the smaller.Their sum 84. Find the numbers.
*January 31, 2014*

**math**

Pre-Cal between 0 degree C and 30 degree C the volume V (in cubic centimeters) of 1kg of water at a temperature T is given by the formula. V=999.87-0.06426T+0.0085043T^2-0.0000679T^3 Find the temperature at which the volume of 1 kg of water is a minimum.
*January 28, 2014*

**Science-bobpursley/Ms.Sue**

Don't break the honor code but i can help explain a little try looking up to see if the fossils under the trilobite is older than you will know
*December 12, 2013*

**Science-Ms.Sue**

what about number 4 is tat also d i am trying to understand evolution much better.
*November 24, 2013*

**algebra**

what is negative one sixth times two and three fourths
*June 30, 2013*

**Math**

write an expression equivalent to -1/4(8y-10)
*June 1, 2013*

**Algebra**

Hi, can I have some help with my permutation/combination homework? "Find the number of 5-card hands that contain the cards specified." 1. five red cards 2. five cards, none are number cards 3. five cards of the same suit
*May 29, 2013*

**us history**

Why did Johnson request the Tonkin Gulf Resolution
*April 15, 2013*

**College Statistics**

yes
*March 30, 2013*

**Math- PLEASE HELP**

Ok I corrected my mistake and got that it would cost $51.48, because it was 15 gallons she needed to get. Is this correct now? Thank you
*March 17, 2013*

**Math- PLEASE HELP**

MS Wilkens went to the gas station to fill her car. Her gas tank is 20% full. The cost of gas is $4.29 per gallon. How much will itcost to fill the tank? Use the conversion 1 gallon=231 in cubed. They showed a pic. of a tank with length=1.75ft width=1.25 ft height=11 in I did ...
*March 17, 2013*

**pre cal**

If (a, b) is a point on the unit circle that corresponds to the angle t, then tan(t) equals:
*February 17, 2013*

**Expand binomial Pascal's triangle **

(p+q)^9
*January 17, 2013*

**Statistics**

318
*January 7, 2013*

**statistics**

your teacher has invented a fair dice game to play. your teacher will roll one fair eight sided die and you will roll a fair six sided die. each player rolls once and the winner is the person with the higher number. in case of a tie neither player wins. a. let A be the event &...
*January 6, 2013*

**chemistry**

In the following reaction, how many grams of ferrous sulfide (FeS) will produce 0.56 grams of iron (III) oxide (Fe2O3)? 4FeS + 7O2 d 2Fe2O3 + 4SO2
*December 6, 2012*

**physics **

A small child has a wagon with a mass f 10 kilograms (KG). The child pulls on the wagon with a force of 2 newtons (N). What is the acceleration of the wagon?
*December 4, 2012*

**Chemistry**

Balance the following equations: A. N2O>N2+O2 B. HBr>H2+Br2 C. CH4+O2>CO2+H2O
*November 28, 2012*

**Chemistry**

What is C2H5OH+3O2>CO2+H2O balanced?
*November 28, 2012*

**CALCULUS**

what is the area in square units of the region under the curve of the function f(x)=x+3, on the interval from x=1 to x=3? 10 12 14 16 18 ?
*November 27, 2012*

**Physics, science, **

I'm desperate Please help 2. A bird, starting from rest, accelerates at 3 m/s2 north for 5 seconds. It then sees the rest of its flock and turns due east accelerating from its previous speed to 20 m/s in 2 seconds. A. What is the velocity of the bird after the initial leg...
*October 12, 2012*

** Thanks**

Thanks Deborah i needed help.
*October 9, 2012*

**Trig**

A 16 - foot ladder leaning against the side of a house reaches 12 feet up the side of the house. What angle does the ladder make with the ground
*September 23, 2012*

**history**

thanks !? lol
*September 19, 2012*

**history**

2 big important facts about the 13 amendment.
*September 19, 2012*

**u.s. history**

thank you soo much(:
*September 18, 2012*

**u.s. history**

What came in order? 1.)abraham lincoln presidency 2.) jefferson davis presidency 3.) battle of bull run 4.) fort sumter
*September 18, 2012*

**Science Struggle**

Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 533 m/s in 2.45 s and can be brought to a stop again in 2.37 s. Find the acceleration of the sled when braking. Answer in units of m/s^2
*September 13, 2012*

**physics**

Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 533 m/s in 2.45 s and can be brought to a stop again in 2.37 s. Find the acceleration of the sled while accelerating. Answer in units of m/s2
*September 13, 2012*

**physics**

(A)Acceleration = -1.6 m/s Vi = 13.3 m/s Vf = 0 T(time) = ? T = Vf-Vi/A T = 0-13.3/-1.6 T = 8.3125 s
*September 13, 2012*

**physics**

With an average acceleration of −1.6 m/s^2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop? Answer in units of s
*September 13, 2012*

**Science**

A 0.05 kg arrow with the velocity of 180 m/s is used to shoot a 5 kg block of wood off the top of a log. What will be the velocity of the arrow and wood after contact?
*September 8, 2012*

**Science**

A 1 kg poodle running right at 3 m/s has an elastic head on collision with a 9 kg basset hound walking left with a velocity of 1 m/s. After the collision the poodle bounces off to the left at 3 m/s. Whats the basset hounds velocity after the colllision?
*September 8, 2012*

**Science**

A 1000 kg car moves at 60 m/s. What braking force is needed to halt the car (change its momentum) in 6 s?
*September 8, 2012*

**Math**

State domain and range for f(x) = 2[x]
*September 6, 2012*

**chemistry**

E=hv h=6.6E-34Js E=5.1E-22k E/h=v 5.1E-22k/6.6E-34Js =
*August 28, 2012*

**Chemistry**

What would be the final concentration if 175mL of a 0.45M solution of sodium sulfite Na2SO3 are added to 650mL of water? Please reply with the steps on how to do this question so I can learn. I can't find examples or anything related in my textbooks and I take it via ...
*June 14, 2012*

**Chemistry**

If 125mL of a 1.10 NaCl solution is mixed with 105mL of a 0.850M CaCl2 solution but NO reaction takes place, calculate the final concentration of each of the ions in the final solution. Please reply with the steps on how to do this question so I can learn. I can't find ...
*June 14, 2012*

**Chemistry**

A 15.0mL solution of H2SO3 is neutralized by 12.0mL of a standardized 1.00M NaOH solution. What is the concentration of the H2SO3 solution? Please reply with the steps on how to do this question so I can learn. I can't find examples or anything related in my textbooks and ...
*June 14, 2012*

**chemistryy**

The reaction between 34.0 g of NH3 and excess oxygen gas produces 45.9 g of NO gas and some water. Determine the percent yield.
*May 18, 2012*

**chemistryy**

The reaction between 34.0 g of NH3 and excess oxygen gas produces 45.9 g of NO gas and some water. Determine the percent yield.
*May 18, 2012*

**english 1 honors**

In the writer by richard wilbur what does the speaker compare his daughter to?
*May 7, 2012*

**Geometry **

If AB= 9 centimeters and BC= 12 what does Ac equal ? and it is a right triangle .
*April 16, 2012*

**physics**

C. now answer my question please !
*April 16, 2012*

**general chem**

A certain monoprotic weak acid with Ka = 0.49 can be used in various industrial processes. (a) What is the [H+] for a 0.191 M aqueous solution of this acid and (b) what is its pH? Round the [H+] to three significant figures and the pH to two places past the decimal and do NOT ...
*March 25, 2012*

**general chem**

A certain monoprotic weak acid with Ka = 0.49 can be used in various industrial processes. (a) What is the [H+] for a 0.191 M aqueous solution of this acid and (b) what is its pH? Round the [H+] to three significant figures and the pH to two places past the decimal and do NOT ...
*March 25, 2012*

**math**

40% of the 25 students in the class are boys. Write 40% as a fraction? Then find the ratio of girls to boys
*March 8, 2012*

**algebra**

a landscaper uses square tiles to make garden paths the ends of the paths are always 2 tiles wide, and the center portions of the paths are 3 tiles wide. what eqation gives the total number y of tiles needed to make a path with a length of x tiles. the landscaper has 100 tiles...
*February 26, 2012*

**Economics**

110
*February 22, 2012*

**statistics**

Among coffee drinkers, men drink a mean of 2.8 cups per day with a standard deviation of 0.5 cups. Assume the number of drinking per day follows a normal distribution. What proportion drink 3 cups per day or more?
*February 20, 2012*

**algebra, please help**

(y^2 + 10y + 25)/(y^2 - 9) * (y^2 + 3y)/(y + 5) (y+5)(y+5)/(y+3)(y-3) * y(y+3)/(y+5) (y+5)/(y-3) * y/1 y(y+5)/(y-3) or y^2+5y/y-3
*December 7, 2011*

**physics**

A car is safely negotiating an unbanked circular turn at a speed of 17.2 m/s. The maximum static frictional force acts on the tires. Suddenly a wet patch in the road reduces the maximum static frictional force by a factor of three. If the car is to continue safely around the ...
*November 22, 2011*

**Math-Algebra 2**

Ace Rent a Car charges a flat fee of $15 and $0.25 a mile for their cars. Acme Rent a Car charges a flat fee of $30 and $0.17 a mile for their cars. Use the following model to find out after how many miles Ace Rent a Car becomes more expensive than Acme Rent a Car. c= 15+0.25m...
*October 27, 2011*

**math**

Lcm of 2 and 3
*October 19, 2011*

**physics**

A. m1a1=T-m1g and m2a2=T-m2g are your two equations, substitute and add and you get this --> T= (2xm1xm2)/(m1+m2) all multiplied by 9.8 (g). T= (2(3.0)(7.0))/(3+7) = 4.2(9.8) = 41.16 N B. Then just plug it in to one of your original equations. m1a1 = T-m1g (3.0)a = (41.16N...
*October 14, 2011*

**Algebra**

The sum of two consecutive odd integers is 56. A. Define a variable for the smaller integer. B. What must you add to an odd integer to get the next greater odd integer? C. Write an expression for the second integer. D. Write and solve an equation to find the two odd integers.
*October 14, 2011*

**chemistry**

20.0 g of CH3OH is frozen solid at -98.0 degrees C. What is the total energy required to melt it, warm the liquid to its boiling point, and then just vaporize it?
*October 6, 2011*

**math **

Fraction simplest 12 over 210
*September 25, 2011*