# Posts by zoey

Total # Posts: 157

**Mathematics**

Using a pair of compasses, a ruler and a pencil, construct a triangle CDE in which DE =10cm, DC= 8cm and angle DE= 45 degree

**Physics**

A horizontal spring(k= 86.2 N/m) is placed on a countertop and is compressed a distance of 36.3 cm. A 103.5 g object is placed at the end of the spring. The coefficient of kinetic friction between the object and countertop is measured to be .47. What acceleration will the ...

**Physics**

Pepe and Alfredo are resting on an offshore raft after a swim. They estimate that 3m separates a trough and an adjacent crest of surface waves on the lake. They count 14 crests that pass by the raft in 20 seconds. Calculate how fast the waves are moving.

**Physics**

Could you explain why you multiplied the constant by the .15m?

**Physics**

when loading a toy launcher, a spring is pulled back 15 cm. the spring is known to have a spring constant of 315 N/m. A small object of mass 4.46 g is place at the end of the spring. What acceleration will the object experience the instant the spring is released?

**Physics**

A turntable rotating at 33 1/3 rpm is shut off. It brakes with constant angular deceleration and stops in 26 seconds. Find the average angular acceleration. I took 33 1/3 divided by 26 and then tried to convert to rad/s^2 but I keep getting the wrong answer. How should I ...

**physics**

Would I use this equation: w=deltaOMEGA/deltaTIME

**physics**

a person riding a bicycle whose wheels have an angular velocity of 20 rad/s. The brakes are applied, and the bike is brought to a stop through a uniform acceleration. During braking, the angular displacement of each wheel is 15.92 revolutions. How long does it take for the ...

**Math (Geometry)**

What is the converse of this statement: if two angles are supplementary and congruent, then they are right angles.

**Math**

Thank you steve

**Math**

How do I write the equation for this. Eight less than twenty.

**math**

The sum of three numbers is 89 . The third number is 3 times the second. The first number is 9 more than the second. What are the numbers?

**Math**

9:45

**chemistry**

2.) If the volume of a gas at -73 degrees celcius is doubled while pressure is held constant, what will be its final temperature in degrees celsius? 5.) A gas storage tank at a large industrial plant is designed to provide fuel under constant pressure. When the plant is shut ...

**science**

decreased ecosystem disruption

**Math HELP!**

Yay!! I got them correct!!

**Math HELP!**

Thanks so much!

**Math HELP!**

Okay thanks so the answer is 3/8!

**Math HELP!**

1. Write 12/32 in simplest form. Could someone please help me on how I can turn this fraction into simplest form like explain the steps! Thanks.

**english**

circle the simple subject

**math help me**

Those are the right answers, just got 100% thanks!

**Math**

Thank you.

**Math**

Thank you for volunteering for this website and helping me!

**Math**

You are amazing!

**Math**

ooooh! okay! thank you! That does make more sense. Thank you!

**Math**

Oh!!.... totally MY fault I said a stack of 16 nickles when I meant 4!! MY FAULT!!

**Math**

It's confusing for me that I have to add and what I have to add.

**Math**

I have to add and not multiply. (Not your fault)

**Math**

I posted that and didn't see your answer!

**Math**

sorrrrrrrry!!!!!

**Math**

hello? Sorry...I need answers quick.(not trying to say this in a mean way but i'm home sick ive been home for two days and I have lots to do.)

**Math**

Jeremy collected nickels for 1 week. He is making stacks of his nickels to determine how many he has. The thickness of 1 nickel is 1/16 inches. -How tall is a stack of 16 nickels? -What is the combined height of 3 nickels, 2 nickels, and 1 nickel?

**Science**

The density of ocean water depends on the depth because pressure compresses the water. If the density of ocean water at a depth of 10,000 m is 1.071 g/mL and if 25.0 g of water at that depth contains 190 mg of potassium chloride, what is the molar concentration of potassium ...

**geometry**

a monster truck's is 8 ft in diameter. during the last event, the tire rolled for 3 miles. how many revolutions did the tire make? 3(5280)

**chemistry**

I think the problem is your you shouldn't multiply the number of moles with the the elements number ,,,that's what I think ,,

**Calculus**

Determine the equation of the tangent line at the indicated -coordinate. f(x) = e^(-0.4x) * ln(18x) for x= 3 The equation of the tangent line in slope-intercept form is

**Calculus**

To estimate the height of a building, a stone is dropped from the top of the building into a pool of water at ground level. How high is the building if the splash is seen 6.7 seconds after the stone is dropped? Use the position function for free-falling objects given below. (...

**science**

Calculate the buoyant force in air on a kilogram of gold (whose density is about 19 grams per cubic centimeter). The density of air is 1.3 ✕ 10-3 grams per cubic centimeter. Remember that the buoyant force is equal to the weight of a volume of air that is equal to the ...

**physics**

A small rock passes a massive star, following the path shown in red on the diagram above. When the rock is a distance 4e+13 m (indicated as d1 on the diagram) from the center of the star, the magnitude of its momentum p1 is 1.1e+17 kg ·m/s, and the angle α is 116 ...

**math**

x = t − 2 sin t, y = 1 − 2 cos t, 0 ≤ t ≤ 6π Set up an integral that represents the length of the curve.

**physics**

A jumper of mass m=55 kg starts in a crouched position with the jumper's center of mass at a position y1=0 m. Just before the jumper leaves the floor, his or her center of mass is at y2=0.7 m. From another measurement, you have found that the velocity of the jumper's ...

**science**

A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...

**calc**

Find the centroid of the region bounded by the given curves. y = 2 sin 3x, y = 2 cos 3x, x = 0, x = π/12

**Science**

What are ten observations made by Charles Darwin on his voyage and what are their significance?

**Algebra 1**

Thanks

**Algebra 1**

For the points R (9,4), A (-2,4) and T (9,3),find the length of the hornizontal and vertical sides of the figure.

**Algebra 1**

Explain why any two regular n-sided polygons would be considered to be similar and how knowing this information could help in solving real-world problems.

**Algebra 1**

A circular pool has a diameter of 12 feet. The pool is 5 feet deep everywhere. How much water is needed to fill the pool?

**physics**

A 8.05- g bullet from a 9-mm pistol has a velocity of 346.0 m/s. It strikes the 0.785- kg block of a ballistic pendulum and passes completely through the block. If the block rises through a distance h = 16.04 cm, what was the velocity of the bullet as it emerged from the block?

**Chemistry**

2.5 mol Zn and 8.75 mol HCl react according to the equation Zn + 2 HCl −→ ZnCl2 + H2 . Calculate the amount in moles of ZnCl2 formed. Answer in units of mol

**Chemistry**

AgNO3 + NaCl → AgCl + NaNO3 . How many grams of NaCl would be required to react with 446 mL of 0.211 M AgNO3 solution? Answer in units of grams

**Algebra 1**

Thanks

**Algebra 1**

A train travels on a 30 mile long circular track that surrounds an entire city. What is the area of the city rounded to the nearest half mile?

**algebra 1**

Thanks

**algebra 1**

Once trees grow to a certain height, the trunks quit growing taller and only grow thicker. The forest rangers want to calculate the diameter of the cross-section of some trees in order to estimate how much they grew in the past year. They measured the circumference of the ...

**MATH CHECK ANSWERS**

what?

**MATH CHECK ANSWERS**

CHECK THESE MATH ANSWERS PLEASE 1. There are 18 boys and 12 girls in a math class.what is the ratio of girls to total students? A.18:30 B.12:30(I PICK THIS) C.30:12 D.30:18 2.which of the following ratios are equivalent to 6:9? Choose all that apply. A.3:2 B.18/27 C.30:45 D.24...

**MATH CHECK ANSWERS**

CHECK THESE MATH ANSWERS PLEASE 1. There are 18 boys and 12 girls in a math class.what is the ratio of girls to total students? A.18:30 B.12:30(I PICK THIS) C.30:12 D.30:18 2.which of the following ratios are equivalent to 6:9? Choose all that apply. A.3:2 B.18/27 C.30:45 D.24...

**socialstudies(CHECK ANSWERS)**

modern mexico check answers 7. Which of the following was largely responsible for the Mexican Revolution? A. separation from Spain B. the overthrow of Maximillian(I PICK THIS) C. widespread poverty D. lack of women's rights 9.Why did the Mexican Revolution most likely ...

**socialstudies(CHECK ANSWERS)**

im not sure all it says is modern mexico

**socialstudies(CHECK ANSWERS)**

1. What marked the beginning of agriculture in the Americas? A. Native people began raising goats. B. The hoe was invented. C. Native people began growing maize.(I PICK THIS) D. The Spanish arrived. 2. Aztec aqueducts were an important accomplishment because they A. prevented ...

**socialstudies**

can anyone please answer these 5 before i scratch my brain out.i did the rest but these i couldn't get What marked the beginning of agriculture in the Americas ? A.Native people began raising goats. B.The hoe was invented. C.Native people began growing maize. D.The Spanish...

**English**

A. is

**Math**

an algebra book weighs 6 oz less than twice as much as grammar book. if 5 algebra books weigh the same as 8 grammar books, how much does an algebra book weigh?

**Math**

On a centimeter dot array, draw all possible rectangles with an area of 16 sq cm and sides whose lengths are whole centimeters. Label the lengths of two adherent sides of each rectangle

**english**

Identify the nouns and verbs in this sentence please. The Lord is my strength and my salvation; in him I will trust.

**english**

What are the nouns and verbs in this sentence? Life is full of choices, so I must learn to make good ones.

**math**

what is three less than 11 times a number is the same as the number decreased by 13. find the number

**math**

I don t understand it that well but now I do Ms.Sue is the best:D

**Math**

Stephen earned $55 last week. He spent 9% of his earnings on entertainment. What decimal represents this percent?

**Math {ASAP}**

x=2

**Pre-Calc**

thank you!

**Pre-Calc**

What's my next step??

**Pre-Calc**

for the conic y=5x^2-40x+78 find an equation in standard form and its vertex, focus, and directrix

**calculus**

thanks!

**calculus**

Suppose $5000 is deposited in a bank account that compounds interest four times per year. The bank account contains $9900 after 13 years. What is the annual interest rate for this bank account?

**Math**

Probability Review , How many different numbers can you make with the digits 2,3,and 4 if you can use each digit as many times as you want?

**History-The Early Greeks**

Why did the use of money help trade to grow?

**History-The Early Greeks**

Name three rights granted to Greek citizens that American citizens have today.

**History-The Early Greeks**

How did early Greek civilizations use their natural surroundings to prosper and grow?

**History-The Early Greeks**

Thanks!

**History-The Early Greeks**

Why did the use of money help trade grow?

**math**

105x212=22,260 estimated=22,300

**Math, mathematics of finance**

I am stuck on these two math questions. If nyone could help me solve them it would be greatly appreciated! Here is the information: Engineering estimates indicate that the variable cost of manufacturing a new product will be $35 per unit.Based on market research, the selling ...

**Chemistry**

Consider the following reaction. 4 Al(s) + 3 O2(g) → 2 Al2O3(s) It takes 1.00 L pure oxygen gas at STP to react completely with a certain sample of aluminum. What is the mass of aluminum reacted?

**Math**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?

**Math**

If both masses are increased by 60% and the distance between them is halved, by what percent will the force of attraction increase?

**Math**

If 750 m of 3.00-mm-diameter wire has a resistance of 27.6, what length of similar wire 5.00 mm in diameter will have the same resistance?

**Math**

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...

**science, ocean currents**

waste produced by people in delaware has been dumped into the atlantic ocean, where it is distributed by surface ocean currents. which coastal area is most likely to become polluted by this waste

**science, ocean currents**

waste produced by people in delaware has been dumped into the atlantic ocean, where it is distributed by surface ocean currents. which coastal area is most likely to become polluted by this waste

**Math**

$9 dollars

**physics**

At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s2. At this rate, how long does it take to accelerate from 81 km/h to 117 km/h?

**geometry**

The hypotenuse of a right triangle is 25 cm long. One leg of the same triangle is 7 cm long. What is the length of the other leg? Explain how you found your answer.

**Calculus/Trigonometry**

What is the value of x in the equation of an ellipse??? Equation of an ellipse - (x^2/a^2) + (y^2/b^2) = 1

**Chemistry**

6.940925 amu Can be rounded off to two decimal places as 6.94 amu

**math**

3L+2k = 45

**4th grade**

what is a perpidicular ray?

**social studies**

I have found out that India spent over 7 billion dollars on the common wealth games. My question is that did they beat China's record on the money? I am pretty sure India did but I am still asking to double check.

**social studies**

I messed up on my other social studies question. i ment to ask if the BUILDER of the taj mahal had his hands cut off by emperor shah jahan. Is this true? i need proof if this is true. thanks alot