# Posts by ray

Total # Posts: 610

**sci**

1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s penny gun straight...

**science!**

1. A plane accelerated from a speed of 2.0 m/s at the rate of 3.0 m/s2 over a distance of 530 m. What is its speed after traveling this distance? 2. A jet plane must achieve a velocity of 71 m/s for takeoff. From rest and with a 1,000 m long runway, what must the acceleration ...

**Science**

At an accident scene, 276-m long skid marks are found on the road. If the car that made these skid marks can decelerate at –9.8 m/s2, how fast was the car going before braking?

**algebra**

ratio 3 to 5 mixed 20 oz?

**physics**

An apple falls off a tree branch located 35 meters off the ground. How many seconds does it take to hit the ground?

**physics**

A person with a mass of 77.5 kilograms is pushed on a sled across the frictionless surface of a frozen pond with a constant horizontal force of 14.8 Newtons. What is their acceleration?

**physics**

The force of gravity between two people is 4.9 x 10-13 Newtons. Person 1 has a mass of 61.3 kilograms, and person 2 has a mass of 93.5 kilograms. The value of G is 6.67 x 10-11 m3/s2 kg. How far apart are they from each other?

**physics**

a dike in Holland springs a leak through a hole of area 1cm squared at a depth of 2m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? can he do it?

**physics**

Hey Lijia. I'm well aware that you most likely will never see this, but you're a moron.

**Physics**

Thanks so much! I should have thought of the pythagorean therom, but why x^2=70^2-55^2 rather than x^2+(-55^2)=70^2?

**Physics**

You are given a vector in the xy plane that has a magnitude of 70.0 units and a y component of -55.0 units. What are the two possibilites for its x component? Please explain, thanks! :)

**physics**

using the kinematic equation: displacement=initial velocity*time+ .5(acceleration*time^2) delta x= 0*7.8+.5(2.3*7.8^2) delta x= .5(2.3*7.8^2) delta x= .5(2.3*60.84) delta x= 69.966 m with sig figs your answer would be 70 m hope this helps!

**Statistics**

consider a football team whom the numbers on active players' jersey are 29,41, 50, 58, 79,..., 10 (listed in alphabetical order of the players' names) Does it make sense to calculate the mean of those numbers? why or why not?

**American History**

what factors led to the failure of Republicans to secure rights for freedmen in the South in the years between 1865 and 1877

**math**

if i bought a car for $18,500 and price was 35% off what was original price and how do I do the math

**math**

if i bought a car for $18,500 and price was 35% off what was original price and how do I do the math

**math**

The distance from the center of a round table top to the edge of the table top is 4 ft. What is the area of the table top?

**informal logic**

Since Jessica’s participation in local politics increased significantly after she joined her school’s political science club, it is clear that her involvement in that club led her to take an interest in politics. The argument above is flawed because

**Mathematics**

The standard deviation of given population is 4.5 with a mean of 60 and the refit population has a standard deviation of 5.2 with a mean of 75. Calculate the coefficient of variation for both populations and comment on the results.

**Mathematics**

A card is selected at random from an ordinary pack of 52 playing cards.state the probability the card is a club.

**Chemistry**

A sample of glucose, C6H12O6, contains 1.300x10exponent21 atoms of carbon. How many atoms of Hydrogen does it contain? How many molecules of glucose does it contain?

**Algebra**

The following logistic function describes the percent of the population of a city that will purchase the local newspaper. P(t)=(65)/(1+34e^(-0.223 t)) "t" is the number of days since the newspaper is first launched. When will the newspaper reach 60% of the population

**IT Fundmentals of Programming w/ Algoriths & Logic**

How would I write an object-oriented pseudocode for a system that allows a user to enter their name into a text box? When they press the Go button a message will be displayed in a label that says “Hello” and their name.

**Math please help please help**

Out of 42 kids in a class twice as many failed Ela as math,4 failed both. If 7 failed neither, find how many failed each subject. Please help and show work it would be great thanks i really need help thanks

**chemistry**

What is the molarity of hcl is 35 ml is neutralized. By 500 ml of M NaOH?

**math**

y=(-3/4)x-2

**science**

A solution of HNO3 has a pH of 4.5, What is the molarity of HNo3?

**Math**

During the first part of a trip, a canoeist travels 33 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 4 hours. What was the speed on each part of the trip? The speed on the first ...

**Statistics**

The computed t was -.926 with df of 24 for p>.o5. what may you say about the null hypothesis?

**space**

How much is 2000 kg in outer space?

**Math**

Rhombus RHOM with acute angle H

**Education**

Describe the difference between word-level skill and text-level skill attainment for ELL students. Then, describe specific things teachers can do to increase ELL students' text-level skills.

**Education**

Compare and contrast the teaching of comprehension strategies to ELL students and to native English speakers.

**Education**

What are some words of wisdom to think about when teaching ELLs?

**Education**

How do you modify a lesson to teach ELLs?

**Education**

How is an ELL's level of language proficiency determined? How do you modify your assessments to evaluate ELLs understanding of content?

**spanish**

help me translate please!! i tried it myself but it was a mess! :( My name is Isabella and I am 14 years old. I live with my parents and two brothers in the outskirts of Newport. My school is a few miles away from where I live, I go to school by coach but I used to go to ...

**Geometry**

I find these questions so difficult! I've been trying to solve them but I just can't. As they are diagrams they are hard to express in words, so the questions are the links below: 1) tinypic(.)com/r/25z7486/7 2) tinypic(.)com/r/4uhrg3/7 3) tinypic(.)com/r/juu9zs/7 (...

**English**

where can i find help about direct and indirect objects

**Stoichiometry Problems**

How many grams of phosphorus can be obtained from the decomposition pf 45kg of POCL3. 2 POCL3 --(> 2P + 3Cl2 + O2

**Physics**

A 200-g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.00 J, find (a) The force constant of the spring and (b) The amplitude of the motion.

**science**

THIS IS A GUESS!!! silent killer means that you might die instantly. If you have a high blood pressure, you might die.

**anatomy**

what is the differnce in primary atmospheric gases at 1800 ft?

**anatomy**

summary of "into thin air" case study by jennifer lundmark

**statistics**

Run the simulation using n = 30 and N = 10 for a uniform, a bell-shaped, and a skewed distribution. § Identify the mean of the sampling distribution of sample means for each distribution. § Evaluate if the results are what you expected for each distribution. Run the ...

**Math**

Solve the proportion for u. (u-2):(u+3) = 4:3

**Physical Science**

Thanks alot I really appreciate it

**math**

0.05

**math**

The volume of a ball is 288 pi cm^3. Find the dimensions of a rectangular box that is just large enough to hold the ball. use 3.14 for pie

**math**

The volume of a ball is 288 pi cm^3. Find the dimensions of a rectangular box that is just large enough to hold the ball. Use 3.14 for pie

**math**

The volume of a ball is 288 pi cm^3. Find the dimensions of a rectangular box that is just large enough to hold the ball.

**11th grade**

Consider two vectors where F1 = 38 N, F2 = 58 N, and = 240o and = 25o, measured from the positive x-axis with counter-clockwise being positive. What is the magnitude of the equilibriant?

**spelling**

Satelites Is that spelled correctly?

**math**

66 2/3 % of what number is 64.2% I know the answer is 64.2% put I need the steps to get there.... thank you

**Math**

I need to write the specified ratin as a simplified fraction. A certai lake is 1100 ft deep. A nearby lake is 300 feet deep. Write the ratio of te fist lake's depth to the second lake's depth.

**math**

A building cast a shadow 42m long. At the same time, the shadow cast by a 34 cm tall pole is 86 cm long. Find the height of the building

**statistics probability**

The scores on a test are normally distributed with a mean of 140 and a standard deviation of 28, what is the score that is one standard deviation above the mean?

**history**

create a collage that shows how greek culture is reflected in modern-day society.

**chemistry**

Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.

**7th grade, math**

-10=-1+3n

**Chemistry**

What will be the final temperature if 2000g of copper at 95 degrees loses 10 kcal of heat?

**Chemistry**

If the decomposition of 3.785 g iron (III) chloride yields 1.302 g iron and 2.483 g chlorine, how many grams of iron and chlorine are produced when 2.175 g iron (III) chloride decomposes?

**8th grade**

How can I get rid of the -x this is the problem -x-6=-5 Thanks

**physiscs**

so what?

**physiscs**

a pendulum of the length L is suspended from the ceiling of an elevator. When the elevator is at rest , the period of the pendulum is T. In instant when the pendulum reaches its highest position the elevator starts the free fall. What is the period of the pendulum if the ...

**statistics**

0.4

**physics**

Soccer player #1 is 8.6 m from the goal. If she kicks the ball directly into the net, the ball has a displacement labeled A. If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball under goes two successive displacements, Ay and Ax. ...

**physics**

Given the quantities a = 9.7 m, b = 4.2 s, c = 69 m/s, what is the value of the quantity d = a^3/(cb^2)?

**physics**

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is 85.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of 35.0 ...

**geometry**

Center and radius of x^2 + y^2 – 4y = 0.

**math**

Ok we have to graph a step function. I am given y=[-5x]. How do I write the chart for this in order to graph it?

**British Literature**

i need the answers! i don't have them

**British Literature**

1)What theory does the narrator propose in the first paragraph of “The Mark of the Beast”? A) In Asia, Asian gods rather than the Christian God control most events. B) The British Empire is doomed because it disregards the values and traditions of native peoples. C) ...

**math 117**

I am having an issue solving this appendix.... Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to ...

**english**

can anyone tell me the indivituality displayed by othello in the play by shakespeare?

**physics**

2.A ball rolls off a shelf with a horizontal velocity of v. At what horizontal distance from the shelf does the ball land if the height of the shelf is h above the floor? 3. A car travels around a circle with a diameter of 500 m at a constant speed of 25 m/s. The static ...

**physics**

4. Two masses of 3 kg and 5 kg collide head-on, the former moving to the right with the speed 5 m/s and the latter moving to the left with the speed 3 m/s.After collision they stick together. What amount of mechanical energy is lost? 5. A cylinder with a uniform density is ...

**physics**

A car is traveling with a constant speed 80 miles per hour a road that makes half a circle. What is the average velocity of the car?

**Algebra**

Simplify the expression (x(3/2)^(4/3)(√x)/x)

**Math**

At Shannons birthday Kira ate 3 pieces, Brazdley ate 2,Shauna ate 4, and Sammi ate 3 pieces of pizza. Now 1/4 of the pizza is left. How many pieces was the pizza originally cut into?

**Religions Of the World**

How do you think the importance of these relationships developed? What spiritual purpose do you think they serve for indigenous peoples?

**Physics**

A 225-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate

**Algebra**

a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation

**math**

3x-6=6

**Math 12**

I need to write this parabola question 2(x+3)^2 -1 in general form. Not sure how to do it. Do I sqaure whats in brackets first? x^2 + 6x +9 then *by 2 so 2x +12x +18 - 1 = 0 Would this be the answer or am I doing it wrong? Any help appreciated.

**math**

if logx y=2, whic of the following is true?

**trig 30**

If cos^2 theta -6 sin 2 theta =0, one value of theta is a)0 degrees b) 90 degrees c)180 degrees or D)255 degrees. Please show me how to do it and not just give answer cause I have two more questions that are similar. Thanks so much.

**Math 30 Trig**

What is the value of theta if 9 cos^2 theta + 3 cos theta = 0 where 90 degrees < theta < 180 degrees?

**Chemistry**

If the radiation of an automobile contains 12L of water, how much would the freezing point be lowered by addition of 5 kg of prestone (glycol, C2H4(OH2))? How many kg of zerone (methyl alcohol, CH3OH) would be required to produce the same result? assume 100% purity .

**chemistry**

How much ethyl alcohol (C2H5OH) must be added to 1.00 L of water so that the solution will not freeze at -4°F?

**social studies**

indentify: green mountain boys

**7th grade**

describe three actions taken by the Second continental congress?

**7th grade**

indentify: green mountain boys

**7th grade**

describe three actions taken by the Second continental congress?

**Physics**

A 1.15 kg block slides down a 19.0 m long 29.0° incline at constant velocity. How much work is done by friction?

**Trigonometry**

Simply: cot(-x)-1/1-tan(-x) Is it -cotx? The other answer choice is: cotx.

**Culteral Diversity**

a. Capitalist

**Mythology**

I think you're missing the question...

**Mythology**

What is a possible explanation for the significance of two separate flood myths in which the water comes from the sky (Guatemalan mythology) and in the other, the water comes from the ground (African mythology)?

**4th grade**

1/6 or 1/2x1/3=1/6