# Posts by Maria

Total # Posts: 2,003

**chemitry--- physical & chemical change---**

describe a physical change that appears to change chemically???

**Pre-Ap Physics**

To win the game, a place kicker must kick a football from a point 17 m (18.5912 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 15 m/s at an angle of 58.9 ◦ from the horizontal. The ...

**Pre-Ap Physics**

To win the game, a place kicker must kick a football from a point 17 m (18.5912 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 15 m/s at an angle of 58.9◦ from the horizontal. The ...

**Pre-Ap Physics**

A rock is projected from the edge of the top of a building with an initial velocity of 16.3 m/s at an angle of 39 ◦ above the horizontal. The rock strikes the ground a horizontal distance of 90 m from the base of the building. The acceleration of gravity is 9.8 m/s 2. ...

**Pre-Ap Physics**

During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 2.65 km/s at an initial inclination of 41.9◦ to the horizontal. The acceleration of gravity is 9.8 m/s 2 . How far away did the shell hit? Answer ...

**Pre-Ap Physics**

To win the game, a place kicker must kick a football from a point 17 m (18.5912 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 15 m/s at an angle of 58.9 ◦ from the horizontal. The ...

**Pre-Ap Physics**

During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 2.65 km/s at an initial inclination of 41.9◦ to the horizontal. The acceleration of gravity is 9.8 m/s 2 . How far away did the shell hit? Answer ...

**history**

how is plymouth settlers are different from the settlers at the Jamestown?

**History**

why does the pilgrims settlement of plymouth succeed?

**history**

what were some of the ways in which social darwinism or the idea of survival of the fittest shaped american thought in the past?

**Art**

What style did Filippo Brunelleschi use?

**physical science**

A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...

**Pre-Ap Physics**

A rock is thrown upward at 51.1◦ with respect to the horizontal. As it rises, its vertical component of velocity 1. remains unchanged. 2. decreases. 3. increases. 4. Unable to determine.

**Physics Pre-Ap**

014 (part 1 of 2) You drop a stone from a position of rest. How far will it fall vertically in the ﬁrst 2 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m 015 (part 2 of 2) If you instead toss it horizontally at 2.7 m/s, how far will it fall vertically...

**physical scienece**

Does every moving body possess kinetic energy? Does every stationary body possess potential energy?

**physical sciencei**

ke=1/2 (mass)(velocity) ke=1/2mv^2 ke= 1/2m(10^2-0^2) ke=1/2m(20^2-10^2) ke=1/2m(100) ke=1/2m(400-100) ratio is 300/100 or 3/1

**chemistry -- radioactive decay**

suppose you have a 150 gram sample of radioactive decay god-191 which has a half- life of 3.4 hours. how many grams of gold will ramain after 10hrs ? after 24 hrs? answer : 10 hrs :10/3.4= 2.94 times 150*(1/2)^2.94 = 18.75 grams 24 hrs: 24/3.4 = 7.06 150*(1/2)^7.06= 1.12 right...

**Chemistry - radioactive decay .**

list 2 reason why this isotope of gold- 191 would not be a good substitute for making jewelry?

**Pre-Ap Algebra 2**

if the graph of the equation 3x+by=2 is perpendicular to the graph of 2x-3y=-4 determine the value of b

**History**

I don't have a history book!

**History**

How did Pilgrims live? Who were the Purtains?

**History**

What type of settlement did the Pilgrims build?

**History**

What did the Mayflower passengers create when they wrote "civil body politick"?

**History**

How did the Mayflower Compact create representative government?

**physics**

A passenger on a moving train tosses a coin with an initial velocity of (-2.25 m/s) + 4.68 m/s) (from the point of view of the passenger). The train's velocity relative to the ground is (11.5 m/s). (a) What is the minimum speed of the coin relative to the ground during its...

**math**

1,000,200; 1,000,300 each time add 100

**US history**

Thank you so much!!!!

**US history**

What were the essential elements of the settlement of Jamestown that allowed it to survive?

**Physical science**

If you put a 9th grade student in a bathtub and he foisted with most of his head and upper chest above water, how much water would spill out? Additional Information: Bathtub was full of the brim Student is male, and has a normal male IQ (85) Student weights 80kg Student has a ...

**Physical science**

And yes, would you please explain Thanks

**Physical science**

Will a ship loaded with beach balls weight more, less, or the same, as the ship empty?

**physical sicence**

how fast must a ball be thrown upward to reach a height of 12 m?

**physical science**

The 200.g head of a golf club moves at 40 m/s in a circular ARC of 1.2 m radius. How much force must the player exert on the handle of the club to prevent it from flying out of her hands at the bottom of the swing? Ignore the mass of the club's shaft.

**Math**

What is the rule for: Domain: 1, 3, 5, 7 Range: 1, 2, 3, 4 Thanks!

**Chemistry --- chemistry ---**

what is the difference between an atom and an ion ???

**history**

Which of the following is true of President G. W. Bush? A. He vowed to punish all countries sponsoring terrorism. B. He rejected unilateralism. C. He accepted the United States' role in the International Criminal Court. D. He reluctantly endorsed the Kyoto Protocol.

**hate school**

I don't even care

**statistics**

What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?

**statistics**

What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?

**chemistry ( chemistry lab)**

-'Gasoline engine' what are the waste products form this engine ? what element must gasoline be composed of ? -'fuel cell'what are the waste products from this cell ? what is the fuel used in the fuel cell? MY ANSWERs : - C02 , h20 and heat energy are waste ...

**chemistry ---chenistry ---**

If it is assumed that a candle reacts with O2 ,in the air and the only products are energy , CO2 ,H20 ,what 2 elements must be present int he composition of the candle wax???

**History**

Who were the first sea explorers? Why did they explore the oceans? What resulted from their exploration? What did their exploration teach us about the world? What were the result of columbian Exchange?

**History Christopher Columbus**

Thank you Can please answer my other history question!

**History Christopher Columbus**

How did people first come to the Americas?

**Math**

29 I think... based on the order of operations.

**physics**

A popular entertainment at some carnivals is the blanket toss. (a) If a person is thrown to a maximum height of 26.0 ft above the blanket, how long does she spend in the air? (b) Is the amount of time the person is below a height of 13.0 ft more than, less than, or equal to ...

**chemistry (lab)**

how or where does the hat energy produced by the candle come from ?? help me!

**History**

Ok, thank you for answering my other history question :)

**History**

What are the new understanding of the population of the Americas before Eropian contact?

**History**

Thank you Can you please answer my other history question Please.....!!!!!

**History**

What are three ways in which the Americas might have been populated?

**History**

Thank you so much

**History**

How did geography of North America help or hinder our nation's development?

**Algebra**

If m angle BGC =16x-4 and m angle CGD = 2x+13,Find the value of x so that angle BGD is a right angle.

**Algebra**

If m angle FGE =5x+10, Find the value of x so that line FC is perpendicular to Line AE. Line AE is a striaght line

**Geometry**

Line MN is perpendicular to line NP. Point R is in the interior of the angle MNP. If angle MNR = 5x+12 and angle PNR =6x+23. Find both angle measures

**Geometry**

An angle is 15 less than four times its supplement. Find both angle measures.

**Geometry**

Two angles are complementary. One angle is ten less than three times the other angle. Find the measure of both angles.

**Geometry**

The m angle A is 30 more than twice angle B. If angle A and angle B form a linear pair, find the measure of both angles.

**Geometry**

Line AB is perpendicular to line BC. Point E is in the interior of angle ABC. If angle ABE = 2x+3 and angle EBC = 4x-9, find x. Then find the measure of both angles.

**chemistry**

chemical formulae which ends with ite,ate and ide

**chemistry**

many formulae which ends with ite,ate ide

**math**

ann wrote a three digit number. the digit inthe hendreds place is 4 less than the digit in the ones place. the digit in the tens place is two more than the digit in the ones place.the sum of the three digits is 16. what is the three digit number?

**math**

Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $120 for 3 days and 300 miles, while Mary was charged $210 for 5 days and 600 miles. What does Best Rental charge per day and per mile?

**chemistry**

An electronic balance shows the number 2.705 grams ; which digits is/ are the uncertain digit and which are the significant digit?

**chemistry**

does the number 340 have the same meaning as the number 340.0??

**physics**

How far to the nearest meter can a sprinter running at 9 m/s, travel in the time it takes a rock to fall 65 meters?

**chemistry**

2180 nanometer =?meter

**chemistry**

description of the procedure , step by step ,that was used to find the densities.... help me ...!!!

**chemistry**

Using the idea of atoms write a desciption of the difference between an element with a low density and an element with a hight density ???

**math**

Each year a growing tree adds a new ring to its section some years the ring is thicker than others why do you suppose this happens? Suppose the average thickness of growth rings in the Flintstones national forest is 0.5cm about how old is old Fred a famous tree in the forest ...

**math**

What's the circumference of a bicycle wheel with a 27 inch diameter?

**Algebra**

B. y=-2x+3 because: 2x+4y+2=3y+5 2x+4y-3y+2=3y-3y +5 2x-2x+ y+2=-2x+5 y+2-2=-2x+5-2 y=-2x+3

**algebra 1**

-5x-10=2-(x+4)=>5x-10=2-1(x+4) -5x-10=2-x-4 -5x+x-10=2-x+x-4 -4x-10=2-4 -4x-10+10=2-4+10 -4x=8 =>x=?

**algebra**

(-x-1)(-4x^2-2x+2) = 4x^3+2x^2-2x+4x^2+2x-2 =4x^3+6x^2-2

**chemistry**

water has a density of 1g/cm3 ; if 2 different pieces of the wood are put into water which will float and which will sink ? Wood 'a' has a density of 1.19g cm3 Wood "b" has a density of .67 g/cm3 Explain your answer?

**social studies**

how long does it take from Taipei, Taiwan to Miami,FL?? This is not a homework! i just wanna know it by myself cus my friend is going to visit me dis summer. i can't get the info from google or yah

**business and finance**

Ray Long wants to retire in Arizona when he is 70 years of age. Ray is now 50. He believes he will need $130,000 to retire comfortably. To date, Ray has set aside no retirement money. Assume Ray gets 14% interest compounded semiannually. How much must Ray invest today to meet ...

**business and finance**

Mobilee Oil Company accepted a $10,000, 120-day note, dated March 3, at 8.5% to settle a past due accounts receivable. Mobilee Oil discounted the note to raise cash on May 10 at a discounted rate of 9%. What proceeds did Mobilee Oil receive?

**business and finance**

Mel’s Furniture received an invoice dated September 27 for five bedroom sets at $3,000 each. The invoice indicated a trade discount of 5/8/3. The seller of the furniture prepaid the freight of $200. Terms were 2/10 EOM. Assuming Mel pays on November 2, what amount would ...

**business and finance**

Peter Mabel sold a total of 400 Oatmeal ($1.50) and Wheat ($2) breads during the Labor Day weekend. How many of each did Pete sell if total sales were $700?

**business and finance**

Earl Miller plans to buy a boat for $19,500 with an interest charge of $2,500. Earl figures he can afford a monthly payment of $650. If Earl has to pay 36 equal monthly payments, by how much can he afford the boat per month?

**business and finance**

The property of Al’s garage is worth $300,000. Al has a fire insurance policy of $180,000 that contains an 80% coinsurance clause. What will the insurance company pay on a fire that causes $210,000 damage? If Al met the coinsurance requirement, how much would the ...

**business and finance**

Use this information to calculate the following: Sales returns $ 700 Rent expense 1,288 Sales discounts 950 Depreciation expense 600 Cost of merchandise sold 7,600 Gross sales 20,900 Advertising expense 1,650 Salary expense 2,900 Heat expense 900 A. Net sales B. Gross profit C...

**history**

Please help me with my essay titled energy crisis: then and today...thanks

**microeconomics**

Suppose that the U.S. government decides to charge cola producers a tax. Before the tax, 35 billion cases of cola were sold every year at a price of $6 per case. After the tax, 29 billion cases of cola are sold every year; consumers pay $9 per case, and producers receive $3 ...

**readings in world civilization**

Kindly please check my answers. Thanks 1. As expressed in your readings, which of these statements best expresses the crucial paradox of the twentieth century? A. Human life is disregarded as nations seek global security. B. War in the name of liberty leads to tyranny. C. ...

**SCIENCE**

DO YOU THINK ENOGH STEPS HAVE BEEN TAKEN TO REDUCE ERRORS IN MEDICAL ABBREVIATION USAGE?

**algebra**

write in algebraic expressions: a number x increased by three times y

**math**

If I bought a jacket for $280.00 and it was 70% off how much would the jacket be?

**statistics**

The authors state that the heights of women in North America are normally distibuted with a mean of 65.0 and a standard deviation of 3.5 inches. I am 64.5 inches. Using the parameters above, what percent of women in North America are shorter than I am?

**pre cal**

7tan^2(pheta)-2=3

**offices finances**

A. Incorrect because, why would you need an officer sign something they have no concern over. B. Incorrect because, why would you pay money for a lawyer to sign a document. Hint: Collection reminders should be typed as if individually composed for that client. They’re ...

**Science**

1. What are some of the evidence that led Wegener to propose his theory, why it met with hostility and why the theory was revived in the 1950’s?

**College Chemistry**

It worked! Thank you so much :)

**College Chemistry**

What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.370 V? Given: A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25degrees C . The initial concentrations of Pb2+ and Cu2+ are 5.30×10−2 M and 1.60 M, ...

**history of modern china**

was the expectation of chinese rulers during the taiping rebellion unrealistic?

**geography**

Been fearful of its neighbors

**Science**

can anyone please give me an example of a numbered key (classification) for these organisms about their structural features? squirrel,turtle, emu, goldfish and mouse. i need to make three but i need one example... thank you

**Physics**

Never mind, I figured this out.