# Posts by katie

Total # Posts: 2,096

**Chemistry**

What additional information would be needed to calculate the rate in units of concentration per time?

**math**

multiply 6sqrt25x^3*sqrt4x^3

**algebra**

multiply 6sqrt25x^3

**physics**

Two blocks with masses m1 = 20.7 kg and m2 = 55.5 kg, shown in the figure, are free to move. The coefficent of static friction between the blocks is 0.74 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against m2?

**Chemistry**

20.7mL of ethanol (density=0.789g/mL) initially at 8.2 degrees Celsius is mixed with 37.1 mL of water (density=1.0g/mL) initially at 25.7 degrees Celsius in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture? This is how I set up ...

**chemistry**

Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.

**chemistry**

A cook wants to heat 1.10kg of water from 33 C to 100 C. If he uses the combustion of natural gas which is exothermic to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 kJ/gram.

**chemistry**

Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.

**Physics**

A car that weighs 14600.0 N is initially moving at a speed of 58.0 km/hr when the brakes are applied and the car is brought to a stop in 4.7 s. Find the magnitude of the force that stops the car, assuming it is constant.

**math**

While riding your motorcycle, you break to miss hitting a dog. your tires leave a skid mark as you come to a stop. the skid mark forms four angles when it crosses the painted line on the side of the road. one angle formed a 62 degree angle. what other angles are formed?

**chemistry**

At 20 °C, chloroform (CHCl3) has a density of 1.489 g/mL. What is the mass of 7.52 mL of chloroform at 20°C?

**chemistry**

When 15.5 + 0.125 + 2.55 are added, the answer with the correct number of significant figures is

**ANATOMY**

the three major vessels of the portal triad are the hepatic artery, hepatic portal vein and bile duct. What is the location of the triad relative to the liver lobules?

**science**

Circle the term that does not belong in each of the following groupings. 1. HC1 secretion Acetyicholine Histamine Secretin Gastrin 2. Gastric emptying Slowed by fats Enterogastric reflex Solid foods 3. Cephalic phase Reflex phase Intestinal phase Psychological stimuli 4. ...

**Physics**

A ball is thrown horizontally from the roof of a building 29.7 m high at 39.6 m/s. (a) What is the vertical velocity of the ball when it lands? (use down as the positive y-axis direction)b) What is the ball’s total velocity (speed and direction) when it lands?

**physics**

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (as shown in the figure below). Suppose that you loft the ball with an initial speed of v = 15.6 m/s, at an...

**chemistry**

What is the pH of a 2.8 M solution of HClO4?

**chemistry**

What is the pH of a 2.8 M solution of HClO4?

**chemistry**

i didn't know ph could be greater than 14 and poh less than 0

**chemistry**

A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

**chemistry**

A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

**science/anatomy**

common pathways for food and air are the (1), which connects to the mouth, and (2), which connects to the larynx. Epithelium in this region is (3), which provideds good protection from friction. Three bands of skeletal muscle, the (4) propel food into the (5). Entrance to the ...

**ENGLISH**

I have to write an essay about whether or not Jonathan Swift's "A Modest Proposal" was effective as a satire. one quote i have is "I have been assured by a very knowing American of my acquaintance in London, that a young healthy child well nursed, is, at a ...

**science**

how is eating breakfast important to prevent fainting

**SCIENCE**

what are the physiological benefits of eating breakfast. what are the physiological occurances or causes of fainting (syncope). how are these two ^ related and what is the significance

**ANATOMY**

what are the physiological benefits of eating breakfast. what are the physiological occurances or causes of fainting (syncope). how are these two ^ related and what is the significance

**math**

yo mama

**Math**

Please check- I got 10 4(9-2)/2^2+3

**MATH**

Look at this inequality 4m-9<2m-3 Solve the inequality for m. PLEASE HELP ME! CAN YOU PLEASE DO IT STEP BY STEP?

**algebra**

haaaa

**Business Statistics**

Instructions: Prepare your answers using Excel and show your work to get full or partial credit. Question 1: Using the file Wages.xlsx which contains information of working individuals, for a nationwide firm (Value 7 points). a) Run Descriptive Statistics for the variables ...

**College English**

How can I compare "Mother Night" by Vonnegut and "Song of Solomon" by Morrison in terms of Postmodernism?

**Statistics**

A shipment of portable radios contains 14 good radios and 3 defective ones. If two are randomly selected (without replacement) and tested, find the probability that at least one will be defective.

**Statistics**

A shipment of portable radios contains 14 good radios and 3 defective ones. If two are randomly selected (without replacement) and tested, find the probability that at least one will be defective.

**calculus II**

Do a u substitution. u= 1- sqrt(x) du = -(1/(2*sqrt(x)))dx Change your limits by plugging them into the u equation. u= 1 - sqrt(0) = 1-0 = 1 u= 1 - sqrt(9/16) = 1-(3/4) = 1/4 Substitute the u values in for x. The new integral is -2*sqrt(u) du from [1,1/4] OR 2*sqrt(u) du from...

**------college algebra division**

Whoops, some of it didn't line up, but I used the long division method

**------college algebra division**

5x^2 -3x -18 +((12x+71)/(x^2+4)) ___________________________ x^2 +4| 5x^4 -3x^3 +2x^2 +0x -1 -5x^4 -20x^2 --------------------------- -3x^3 -18x^2 +0x -1 +3x^2 +12x --------------------- -18x^2+12x -1 +18x^2 +72 --------------- 12x +71

**statistics**

The claim: mean < 900 other option: mean > or = 900 The null hypothesis is the one with an equal sign... Your null hypothesis would be mean=900 Your alt. hypothesis would be mean<900 The alt. hypothesis is the claim.

**history**

Levy's purpose in the film Crimes and Misdemeanors

**Math**

On a grid, an upright square is a square that is well, upright, on one of its sides, with the sides going along the grid points.

**Math**

I need help on this question, I know the answer (or, at least I think I know it), but I can't think of the rest. Bobby claims that only upright squares can have rational numbers for side lengths. Is he correct? Explain. I got yes, he is correct, but I can't hink of an ...

**Science**

Well, you can write down what your phenotypes are (how you look, ex: eye color, hair color, hair type, etc.) and then by using that, you canfigure out your genotypes by researching whether each of your traits are dominant or recessive. For example, I have a straight hairline, ...

**Chemistry**

Suppose 33.5 g of ClF3(g) and 29.1 g of Li(s) are mixed and allowed to react at atmospheric pressure and 25 C until one of the reactants is used up, producing LiCl(s) and LiF(s). Using the NIST value for the enthalpy of formation of ClF3 (webbook.nist.gov), calculate the ...

**Chemistry**

A 2.3 g sample of C5H10O is burned completely in excess oxygen to yield CO2(g) and H2O(l) at 25 C, releasing 83.42 kJ of energy. What is the enthalpy of formation of C5H10O?

**chemistry**

Calculate the volume of natural gas (methane) required to bring 2.6 L of water to a boil. Assume the initial temperature of the water is 21 C, and the methane is at 1 bar and 25 C. Assume that methane is an ideal gas, the specific heat capacity of water to be constant and ...

**Thermochemistry**

Hint: Write the balanced combustion reaction. You can find the standard enthalpies of formation for O2, CO2, and H2O from many sources, including the CRC Handbook of Chemistry and Physics. Solution: Balanced combustion reaction: C8H18 + 12.5 O2 --> 8 CO2 + 9 H2O From the ...

**Physics**

Pam has a mass of 44.0 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 22.0 m and Pam acquires a speed of 58.0 m/s.

**Science 7R (Lab questions)**

Animal cells lack in a cell wall. Plant cells have it.

**trig**

pi/3 is 7 square root 3/ 2 pi is - 7 square root 3 / 2 and 7pi/6 is -7

**trig**

i didn't realize it was just plugging in! thanks! i just need to figure out how to subtract fractions with pi in them now

**trig**

For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x,y). y=7cos(x-pi/6) for x=pi/6, pi/3, 2pi/3, pi, 7pi/6

**chemistry**

Which of the following sets of solute and solvents will make a homogeneous solution? (naphthalene is a non-polar organic molecule) 1. Water and benzene 2. Benzene and ammonium nitrate 3. Benzene and naphthalene 4. Water and naphthalene

**chemistry**

What is the molecular geometry for SH2? 1. Bent 2. Trigonal planar 3. Tetrahedral 4. Liner

**chemistry**

What volume of a 7.00 M solution of Ca(OH)2 is needed to neutralize 37.2 mL of a 3 M solution of nitric acid? 1. 15.9 mL 2. 37.2 mL 3. 7.97 mL 4. 24.2 mL

**chemistry**

What is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175 mL of ethanol? (Density of ethanol is 0.789 g/mL) 1. 31.1 % 2. 24.5 % 3. 23.7 % 4. 19.7 %

**chemistry**

How many moles of NaOH are in 23.5 mL of a 1.50 M solution? 1. 0.0353 moles 2. 35.26 moles 3. 16.7 moles 4. 0.0235 moles

**chemistry**

What is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175 mL of ethanol? (Density of ethanol is 0.789 g/mL

**calculus**

Let f''(x)=5x+5 with f'(2)=1 and f(-2)=2. Find f'(x) and f(3)?

**calculus**

Consider the function whose second derivative is f''(x)=7x+6sin(x). If f(0)=2 and f'(0)=3 , find f(x) .

**MATH HELP!**

if f(x)+(x-3)^4(2x-1)^3, find the value(s) of x which solve f'(x)=0

**Physics**

A great white shark with a mass of 3000 kg swimming at 3.00 m/s swallows a 250 kg fish at rest. What is the speed of the great white shark right after swallowing the fish?

**MATH**

if f(x)=(x-3)^4(2x+1)^3 find the value(s) of x which solve f'(x)=0

**MATH**

Complete the indefinite integral: ∫(x^2+1)^2 dx

**SCIENCE**

the brachialis is a short stout muscle inserting cloes to the fulcrum of the elbow joint' the brachioradialis is a slender muscle inserting distally, well way from the fulcrum of the elbow joint. Which is a mechanical advantage and which is a disadvantage

**anatomy**

In the body, lever systems involve the interaction of __1__, which provide the force, and __2__, which provide the lever arms. The force is exerted where __3__. The site at which movement occurs in each case is the intervening __4__, which acts as a fulcrum. 1. muscles? 2. ...

**ANATOMY**

place the following in order (1-11): Myosin heads bind to active sites on actin molecules ATP is hydrolyzed Myosin heads return to their high-energy shape(******), ready for the next working stroke Calcium ions bind to troponin Cycling continues until calcium ions are ...

**MATH**

Find the value of A + B if the A is the first term and B is the common difference of the sequence whose 4th term is 3 and 20th term is 35

**MATH HELP!**

find all possible values of the common ratio of the geometric sequence a, b, 6, ... if a+b=1

**Physics**

A wire is frictionless between points A and B and rough between B and C. A is 5m above the ground, B is zero, and C is 2m above the ground. The 0.400kg bead starts from rest at A. If the bead comes to rest at C, find the loss in mechanical energy as it goes from B to C. I can...

**Physics**

An Alaskan rescue plane traveling 36 m/s drops a package of emergency rations from a height of 137 m to a stranded party of explorers.Where does the package strike the ground relative to the point directly below where it was released

**MATH**

given the arithmetic sequence 71,65,59 ... if a(n) is -43 what is the value of n

**MATH**

a pile of bricks has 85 bricks in the bottom row, 79 bricks in the second row, 73 in the third row, and so on until there is only 1 brick in the top row. how many bricks are in the 12th row? how many rows are there in all?

**chemistry**

If 58g of NaOH are dissolved in water to make a final volume of exactly 400mL, what is the molar concentration of NaOH? (The FM of NaOH = 40.0) How do I set this up?

**algebra**

i need help with my math for college, im currently a little behind, ive had 2 tutors but the tutors that ive had don't really know what there doing, this is stressful and im hopig someone who knows what there doing can help me

**HELP**

subtract simplify by removing factor of 1 if possible 3bc/b^2-c^2-b-c/b+C

**Help**

Solve the equation q+7/4+q-3/3=5/2 I think there is no solution

**Help**

Divide and simplify x^2-16/x divide by x+4/x+1 I get (x-4)(x+1)/X is this correct

**Help**

simplify by removing factor of 1 7z-49/7z I have the answer as -7

**Help**

Find the LCM t^3+8t^2+16,t^2-8t

**help**

I will try my best

**help**

find all numbers for which the rational expression is undefinded 8/8z+7 I think the expression is undefined for all real numbers

**HELP**

simplify remove factors of 1 3v-9/3-v

**HELP**

multiply and simplify 3a^8/4t^2*16t^4/9a I have the answwer as 4a^7t^2/3t^2

**HELP**

multiply and simplify 3a^8/4t^2*16t^4/9a I have the answwer as 4a^7t^2/3t^2

**Help**

Find the LCM of 3(t-2)and 6(t-2) is it 18(t-2)

**Help**

Lisa can shovel her drive way in 35 minutes. Tom can shovel the same drive way in 40 minutes. How long will it take them to do the job together?

**MATH**

lim x-->0 x^2+3x/x^2-3x x not =0 1 x=0

**calculus**

A child is flying a kite. If the kite is 125 feet above the child's hand level and the wind is blowing it on a horizontal course at 7 feet per second, the child is letting out cord at _____ feet per second when 245 feet of cord are out. Assume that the cord remains ...

**Social Studies**

I have a midterm tomorrow and this is the essay question: “When men’s minds seem narrow to you, tell yourself that the land of God is broad; broad His hands and broad His heart. Never hesitate to go far away, beyond all seas, all frontiers, all countries, all beliefs...

**art history**

Discuss the ideological and visual differences between Renaissance Art and Baroque Art. (think in terms of, for example, religion, society, and scientific discoveries)

**chemistry**

WHat is a precipitate?

**MATH HELPPPP**

3b+7=-2 14+h/5=2 h/5=fraction m/8+4=16 m/8=fraction 3x-1=8 35=3+5x -3+m/3=12 m/3=fraction -x-4=-20 5=-z-3

**algebra**

3b+7=-2 14+h/5=2 h/5=fraction m/8+4=16 m/8=fraction 3x-1=8 35=3+5x -3+m/3=12 m/3=fraction -x-4=-20 5=-z-3

**PLEASE HELP ME SOLVE !!!!!!!!**

A mass of 11 kg is placed on a frictionless incline which is inclined at an angle of 69 degrees above the horizontal. It is held in place by a rope which is attached to a wall at the top of the incline. The rope is angled 13 degrees above the direction parallel to the incline...

**Physics**

a car traveling westward at 20 m/s turns around and travels eastward at 5 m/s. what is the change in velocity of the car?

**MATH**

a box contains 20 slips of papers, numbered 1-20. A slip of paper is drawn from the box and the number is noted. Find the probability that it is a positive integer less than 21.

**math**

if a set of six books is placed randomly on a shelf, what is the probability that they will be arranged in either correct or reverse order?

**math**

In how many ways can the letters of the word EIGHT be arranged using only four of the letters at a time?

**math**

Solve for y, then find the value of y when given x = –2. 6x = 7 – 4y

**math**

Mr. and Mrs. Smith each bought 10 raffle tickets. Each of their three children bought four tickets. If 4280 tickets were sold in all, what is the probability that the grand prize winner is: a. Mr. or Mrs. Smith? b. one of the 5 Smiths? c. none of the Smiths?