# Posts by Zach

Total # Posts: 407

**8th Grade**

301 m

**Physics**

A 10-g bullet is shot vertically into a stationary 8-kg block. The block lifts upward 3.0 mm. The bullet penetrates the block in a time of .001 seconds. Assume the force exerted on the block is constant. What is the impulse imparted on the block by the bullet?

**Algebra II**

The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a 74.0 w lamp 8.00 ft from the desk, what size lamp...

**Algebra II**

The volume of a given weight of gas varies directly as its absolute temperature t and inversely as its pressure p. If the volume is 4.45 m^3 when p=225 kilo pascals (kpa) and t = 305 K, find the volumn when p = 325 kpa and t = 354 k.

**Algebra II**

The amount paid to a work crew varies jointly as the number of persons working and the length of time worked. If 5 workers earn $5123.73 in 3.0 weeks, in how many weeks will 6 workers earn a total of $6148.48?

**english**

In the sentence: Not only it does affect women and children, but it also affects our society and our future generations. is the sentence correct? Thank you :)

**physics**

how much force is exerted on a bag that is lifted at 5m/s^2 with 18.5kg in it

**Math**

What is 5x^2y^-3 over 25x^6y^2 in simplest form

**Math**

What is the annual interest rate if $1600 is invested for 6yrs. and 456 in intrest is earned

**science**

the lack of atmosphere.

**science**

the tracks of the astronauts who landed on the moon are still there in the dust and show no signs of being worn away.this is attruted to the lack of atmosphere on the moon. which of the following best accounts for the lack of atmosphere.

**physics**

A 4.85-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.645. What is the maximum horizontal force that can be applied before the 4.85-kg block begins to slip relative to the 12.0-kg ...

**Physics**

A.) h/4μk B.) h/16μk

**Chemistry**

"Suppose some sort of clamp is applied to hold an electron fixed at the distance of 2.5 Angstroms from a lithium nucleus Li3+ which is also clamped into position. Calculate the magnitude of the force between the two fixed particles." The books says the answer is: -2....

**algebra 1**

or 100%, depending on what your teacher is looking for

**Chemistry**

"Suppose some sort of clamp is applied to hold an electron fixed at the distance of 2.5 Angstroms from a lithium nucleus Li3+ which is also clamped into position. Calculate the magnitude of the force between the two fixed particles." The books says the answer is: -2....

**Business Managment**

I need help answering these questions

**Physics**

a) Vi= 6.7sin(53) Vi = 5.35 V = Vi - gt at top 0 = Vi - g t so t at top = Vi/g t = .55 y at top = 1 + Vi t - 4.9 t^2 = 1 + 5.35(0.55) - 4.9(.55)^2 y at top = 2.46 b) u = 6.7 cos 53 x = u t x = (6.7 cos 53)(.55) x = 2.22

**Simple Subjects**

What is the complete and simple subject for, One story links this day to an old Roman festival?

**geometry**

Given three collinear points X, Y, and Z and XY=8 and YZ=20, what is the length of a segment joining the midpoint XY and YZ?

**Physics**

A ball swings in a vertical circle at the end of a rope 1.50 m long. When the ball is 35.9° past the lowest point on its way up, its total acceleration is (-22.5 i + 20.2 j)m/s^2. Find radial acceleration?

**MAth (make equation true)**

5+5*6/2=24

**Math**

your aunt gives you a check on your birthday each year. on your first birthday , she gives you a check for one cent. the next year she gives you 3 cents , then 9. each year she triples the amount of the previous year 's check. how old will you be when she gives you a check...

**geometry**

Given the points K=(-2,1) and m(3,4), find coordinates for a point J that makes angle JKM a right angle.

**Calculus Precalculus**

Answer the calculus question about Point P, 45 mph, etc. It is ALREADY posted on here.

**math**

write an equation to show the relationship between the score received and the number of questions the students answers correctly

**Calculus**

Hey, how come no one has answered parts c through e? I need some help here!!! This is the ONLY site on the internet that has this problem worked.

**chemistry**

If 1/2 moles of 02 react with 24 moles of hydrogen, can 2 moles of water be produced?

**Chemistry**

A gas at 1.5 atm, 2.3L, and 23degreeC changed to 1.0 atu and 2.8L. What is the new temperature?

**Chemistry**

Calculate the mass of NaCl produced when 5.50 moles of Sodium reacts with excess chlorine gas.

**chemistry**

and List all measurements and include proper labels. Molecular weight of benzoic acid: 122.12 g/mole Mass of benzoic acid used: Titration of NaOH and benzoic acid: (Fine Titrations Only) Trial 1 Trial 2 Initial volume(NaOH)(ml) final volume(NaOH)(ml) Calculations/...

**chemistry**

PLEASE NOTE: Titration requires several steps in order to obtain exact results. The procedures described in this lab assume that you have already done the TITRATION TUTORIAL and are familiar with the technique. 1. Prepare the NaOH solution by dissolving approximately 4g of ...

**math- algebra- help please!**

3 dice are rolled let (y,r,b) represent each outcome? a- sample space b- prob rolling a sum of 18 c- prob of rolling a sum less than 5

**CALCULUS**

idk

**Spanish**

A usted _______gusta jugar a los deportes. What goes in the blank?

**Calculus**

The Problem: The spherical top holds a little over 54,000 gallons of water. The base of the top is 60 feet above the ground. The diameter of the supporting column is one-third the radius of the sphere. The base of the supporting column flares out like a cone (a frustum) so ...

**physics**

A certain roller coaster has a circular, vertical loop of radius 10 meters, such that at its top the riders are upside down. How fast does the roller coaster move at this point if the riders feel perfectly weightless when passing the top of the loop?

**math**

how do i write a decimal and a fraction to show what part of a dollar one penny represents

**algebra2/trig**

4.8 hours

**Algbra**

I need help with the following question. Solve for y: 3x - 2y = 8 + x Please show the steps and the answer, thanks.

**Geometry**

find the lengths of the sides of a triangle whose perimeter is 37. The measure of the first side of the triangle is 8 less than the second side, and the second side is twice the length of the third side

**Algebra**

Please help me solve for the following coefficients. The equation is: 2X-Y=4 if X = 0, then Y = ? if Y = 0, then X = ? if X = 1, then y = ? if Y = -6, then X =? Thanks!

**physics**

Approximate the gravitational force of attraction between a 49.0 kg girl and a 52.0 kg boy if they are sitting 2.5 m apart

**Algebra 2**

A Rectangular Field is to be enclosed by a fence and divided into three parts by another fencer. Find the maximum area that can be enclosed and separated in this way with 500 meters of fencing.

**Algbra**

I need help with the following problem. -6 less than or equal to 3 + 1/3a less than or equal to 5 Please show steps and answer. Thanks.

**Physic**

A ball throw at 45 degree angle with an initial speed of 15m/s. the time for the ball to reach its highest point can be found from the data and known constants using which equation? solve for time?

**college calc**

vertical asymptotes of tan(pi*x)

**Algbra**

1/4x - 5/12x = x - 4/3 Please show steps and answer. Thanks.

**math**

If g(x)= -2^2 and h(x)=x-2/5. Find the indicated value. h(g(5)) I got -5.4. is that right?

**chemistry**

How many grams are in one milliliter?

**math**

(y^4)^1/6

**chemistry**

your carbon atoms aren't equal and i didn't split up my carbon dioxides however it should change anything balancing wise. 2C3H6N6O6 + 3O2==> 6h20 +6CO2(or 3CO2 +3CO2) + 6N2 C=6 C=6 H=12 H=12 N=12 N=12 O=18 O=18 Hope this helps!

**Algbra**

How do you solve this problem? 3/5k - (k + 1/3) = 1/15 (k + 3) Please show me the steps. Thanks.

**chemistry**

In my book the anser for D is 2.68 x 10^4 mg/L as CaCO3, my first thought was to do what you did but i cant get to the answer in the book, am I missing something very obvious here? Im getting like 5.4 x 10^4

**math**

4(3)+4(3) *4 *4 --------- 12+12=24

**physics**

A museum curator moves artifacts into place on many different display surfaces. Use the values in Table 4-2 in the textbook to find Fs,max and Fk if you were to move a 157 kg aluminum sculpture across a horizontal steel platform. Fs,max: Fk:

**Math**

Are (1/2 x 3) x 8 and 3 x (1/2 x 8) equal? Explain how this can help in finding the area of a triangle

**math**

I need to variables would equal 180 by being divided by 1/2

**math**

A=1/2bh A= 1/2 ? ? A= 180 what could the base and height be?

**math**

How does (1/2 x 3) x 8 and 3 x (1/2 x 8) being equal help in finding the area of a triangle?

**math**

Finding the area or a triangle A=1/2bh A= 1/2 x 13.6 x 7

**math**

How do I find the area of a triangle?

**math**

Thanks Dylan you were completly right!

**Chemistry**

calculate the number of formula units of 0.0067 g of lithium carbonate, Li2CO3?

**Chemistry**

How many grams of potassium can be obtained from the decompostion of 100 grams of KCl?

**chemistry**

How much iron can be recovered from 25.0 grams of FeO?

**science**

In order for conduction to occur particles must make what?

**algebra**

86 degrees Fahrenheit = 30 degrees Celsius so, (30,86)

**Physics**

I have one problem I just can't figure out, A machine in an ice factory is capable of exerting 3.30 * 10^2 N of force to pull large blocks of ice up a slope. The blocks each weight 1.21 * 10^4th N. Assuming there is no friction, what is the max angle that the slope can ...

**physics**

A. 5.729 m/s^2 B. 51.5625 m/s^2 C. 183.333m D. 70,088m

**physics**

A. a = v/t 165km / 8s = 20.625 km/h/s B. t= 60s-8s =52s, V= 1650km/h-165km/h =1485km/h a=v/t 1485km/h / 8s= 185.625km/h/s C. d=1/2at^2 1/2 * 20.625 km/h/s * (8s)^2 = 183.333m D. 60s-8s=52s d=1/2at^2 1/2 * 186.625km/h/s * (52s)^2 = 70.088km

**analogies**

dollar:cent;meter:centimeter

**math**

I would set up a proportion meters 1 x ---- --- --- scale 2.5 100 (% means out of a hundred) Since 25 x 40 = 100, then 1 x 40 = 40 The bridge is 40m long.

**Math-Algebra**

3|x+5|<= 6 |3x+15|<= 6 -15 -15 |3x| <= -9 /3 /3 x <= -3 Yes, you are correct.

**algebra**

You need to set up the proportion Base 6.5m 4m ---- ---- ---- Length 3.7m e Then you cross multiply: 6.5xe=6.5e 4x3.7= 14.1m So therefore, 6.5e = 14.1m Then divide both by 6.5 to get what e equals. 6.5e/6.5 = e 14.1/6.5 ≈ 2 so e ≈ 2.

**Teacher Aide**

Test scoring

**math**

Is this a star polygon, a polygon, or other, how many sides does it have? {9/3}

**math**

A roulette wheel has 18 red slots and 18 black slots numbered alternaetly with the numbers 1 through 36. Two green slots are numbered 0 and 00. The winning number is determined by the slot into which a single marble rolls. Players are not allowed to bet on green. The house ...

**algebra**

1/3(x+3)+1/6(x-6)=x+3

**Math**

When a survey of 800 people was done, 55% of those surveyed said they ate candy, 65% said they ate chips and 90% said they ate hot dogs. What is the smallest possible number of people who said they ate candy, chips and soda? -Zach

**math**

20 divided 2 minus 24 divided by 3 equals ? No parenthesis

**Math**

The side lengths of a right triangle are each an integral number of units. If one of the legs is 13 units, what is the perimeter of the triangle? Thanks ~Zach

**Math**

Six pipes each having a radius of 0.5 feet are stacked in a triangular pile with three pipes on the ground tangent to each other, two in the next row and one on top. What is the height of the pile. Express you answer in simplest radical form

**algebra**

Graph the linear equation. -3x + y = -6

**math**

Graph the linear equation. -3x + y = -6

**Math**

Thank you

**Math**

A large tank contains 400-kg mixture of water and alcohol. The mixture is 64% alcohol by weight. At each step, 100 kg of the mixture will be drained from the tank, replaced with 100 kg of water and then stirred. After three steps, what percent of the final solution will be ...

**algebra**

Simplify: 5-3[2(3x-4)+3]

**math**

Simplify 5-3[2(3x-4)+3]

**math**

thank you jen

**math**

m+1 --- 4 + 5 -- 6 = 2m-1 ---- 12

**algebra**

Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 4. m + 1 5 2m - 1 ______ + ___ = ______ 4 6 12

**algebra**

Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 4. m + 1 + 5 = 2m - 1 ______ _ _______ 4 6...

**9th grade - Civics**

I'm doing a crossword. The question is what is the term to "postpone a sentence/fine?" It starts with an R_ _ _ I _ _ _. Thought it was suspend but this isn't right. Any help is great

**math**

Thank you very much Reiny!

**math**

2(x-5)+3x < 4(x-6)+1

**9th grade Algebra**

go to hell!!!

**math**

Thank you so much Reiny.

**math**

With income earned by selling the rights to his life story, an actor invests some of the money at 3% and 30,000 more than twice as much at 4%. The total annual interest earned from the investments is $5600. How much is invested at each rate?

**Math**

How many positive three-digit integers have the property that the tens digit is greater than or equal to the hundreds digit and the ones digit is greater than or equal to the tens digit? Please help :) thanks -Zach