# Posts by Rachel

Total # Posts: 1,553

**Physics**

A centripetal-acceleration addict rides in uniform circular motion with period T = 4.30 s and radius r = 3.00 m. At one instant his acceleration is a = (4.00 m/s2)i + (-5.00 m/s2)j . At that instant, what are the following values? (a) v · a (b) r x a

**Physics**

In the figure below, a stone is projected at a cliff of height h with an initial speed of 46.0 m/s directed 60.0° above the horizontal. The stone strikes at A, 5.30 s after launching. (a) Find the height, h, of the cliff. m (b) Find the speed of the stone just before ...

**Physics**

A small ball rolls horizontally off the edge of a tabletop of height h. It strikes the floor a distance x horizontally away from the edge of the table. (Use any variable or symbol stated above along with the following as necessary: g.) (a) How long is the ball in the air? t...

**Math**

Peanuts sell for $3.00 per pound. Cashews sell for $6.00 per pound. How many pounds of cashews should be mixed with 12 pounds of peanuts to obtain a mixture that sells for $4.20 per pound?

**calculus 2**

An object falls off a 400-foot tower. With g=32ft/sec^2, as at the Earth’s surface, the object would hit the ground after 5 seconds. What would the acceleration due to gravity have to be to make it reach the ground in half the time?

**calculus 2**

An object thrown in the air on a planet in a distant galaxy is at height s(t) = -20t^2 +67t +42 feet at time t seconds after it is thrown. a) From what height was the object thrown? b) With what velocity was the object thrown? c) What is the acceleration due to gravity on this...

**calculus 2**

If a car goes from 0 to 100 mph in six seconds with constant acceleration, what is that acceleration?

**calculus 2**

A tomato is thrown upward from a bridge 23 m above the ground at 40 m/sec. find acceleration, velocity, and height of tomato at time t. How high does the tomato go, and when does it reach its highest point?

**Physics**

A person walks in the following pattern: 2.8 km north, then 2.7 km west, and finally 6.9 km south. Construct the vector diagram that represents this motion and from it judge how far and in what direction a bird would fly in a straight line from the same starting point to the ...

**Physics**

Vector A has a magnitude of 5.00 units, vector B has a magnitude of 9.00 units, and the dot product A·B has a value of 42. What is the angle between the directions of A and B?

**calculus 2**

A tomato is thrown upward from a bridge 23 m above the ground at 40 m/sec. Take the acceleration of gravity be equal to 9.8 m/s^2 (a) Give formulas for the acceleration, velocity, and height of the tomato at time t. (b) How high does the tomato go, and when does it reach its ...

**Physics**

A tomato is thrown upward from a bridge 23 m above the ground at 40 m/sec. Take the acceleration of gravity be equal to 9.8 m/s^2 (a) Give formulas for the acceleration, velocity, and height of the tomato at time t. (b) How high does the tomato go, and when does it reach its ...

**Physics**

At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?

**Physics**

At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?

**Physics**

287 degrees Celsius

**Physics**

A person walks in the following pattern: 2.8 km north, then 2.7 km west, and finally 6.9 km south. Construct the vector diagram that represents this motion and from it judge how far and in what direction a bird would fly in a straight line from the same starting point to the ...

**Math**

Using only measurements from the ground, determine the air speed of a passenger jet flying over the university. What methods should I use?

**math**

In 1980, the computer hard disk had a maximum capacity of 10 to the 7th power bytes. In 2000 computer hard disk capacity had increased to 10 to the 11th power bytes. By what factor had hard disk capacity increased between 1980 and 2000?

**Trig..please help!**

Two forces are pushing an ice shanty along the Ice. One has a magnitude of 330 lb in a direction due east. The other force has a magnitude of 110 lb in a direction 54 degrees east of north. What are the magnitude and direction of the resulant force?

**algebra**

10n+6=15n-9 In this equation what does n=

**algebra**

10n+6=15n-9 n=

**math**

200 milligrams equals how many ml

**trigonometry**

How do you draw only the top half of a circle in parametric mode on a TI-84 calculator?

**Math**

How do you find the domain and range from y=3x^3+4x^2-5?

**Algebra 2**

How do you find the domain and range from y=3x^3+4x^2-5?

**calculus-can someone please help me with this ques**

a- x-1 and x-5 both have odd mult. of 1 b- (1,0) and (5,0)

**physics**

5 kg of some liquid at 10 Celsius is mixed with 1 kg of the same liquid at 40 Celsius. What is the final equilibrium temperature? Ignore any heat flow with the containers and/or surroundings.

**trigonometry**

If you know the sine of a number, how do you find its cosine?

**Algebra 2**

D. 14.7

**math**

if bob uses x eggs for every 200 grams flour. How many eggs does he use if he uses 900 grams flour?

**labor relations**

to most effectively increase its percentage of the labor force in the 1990s, the union movement should increase its appeal to:

**math**

x=1 y=2 x=2 y=6 x=3 y=18 x=4 y=54 What is the rule?

**Spanish**

1) Yo tengo 2) Nosotros tenemos 3) Tu vienes 4) Nosotros venimos 5) El/ella sale 6) El/ella vuelve need to write with puntuations and spanish astrics if needed

**History**

Its either Africa or asia

**History**

Why do you think the Muslims were not able to conquer most of that continent??

**History**

How might the location of the Arabian peninsula have contributed to the rapid spread of Islam??

**History**

It is 3)*first successful hot air balloon flight

**physics**

I'm not sure how to deal with this problem (we're just starting the unit)... I need to find the average voltage induced into a 100 turn coil by a vertical wire when the wire's current drops from 602A to 0A in 0.01 seconds. ...if the coil was drawn as a circle on ...

**Trigonometry**

triangle ABC is isosceles, with AB=AC=15cm , and m<A = 150. What is the exact length of BC without using trigonmetry?

**Trigonometry**

Thank you. Could you explain in more detail please?

**Trigonometry**

What is sin(cos^-1 a) when 0 < cos^-1 a < 90

**Physics**

Why is it that if deceleration is doubled, distance is halved?

**Geometry**

Trapezoid WERI has legs WI and ER. If WERI is isosceles and if m<I= 110, find m<W, m<R, and m<E. How are you suppose to find the angle measures?

**Corporate law**

At a closing at 10 a.m. on May 3, 2005, X Corp. delivers $25,000,000 to the seller of a factory using $20,000,000 from Bank One secured by a mortgage on the property, and the attorney for X Corp. records its title to the property at the same time. At 2 p.m. the same day, X ...

**Math**

What are 3/8, 5/6, and 1/2 in order from least to greatest.

**Trigonometry**

Does it make a difference whether you translate a graph first and the scale the image, or scale the graph first and then translate the image?

**World History**

Hinduism evovle form the beliefs and practices of the ________, an early Indian society.

**World History**

Like Judaism, Christianity, and Islam,both Hinduism an Buddhism got their starts on the continent of ________.

**World History**

In India, the birthplace of Buddhism, curiously, Buddhism all but vanished, as it was ___________.

**World History**

there are no choices

**World History**

Generally peasants and the lower castes had a more positive reaction to the teachings of the Buddha, since Buddhists did not support the concept of a ________.

**World History**

The Middle Way charted a course between the extremes of the worldliness of Hinduism as some practiced it, and the _________ self-discipline that left people ill in mind and body.

**geometry**

Rick's 76ft times 50ft house sits on a plot of land as shown in the diagram below. If 1 bag of lawn food covers 5000 ft squared , how many bags should Rick buy to cover the lawn (shaded)?

**math**

What properties of light do the frequency and amplitude of light waves represent?

**chemistry**

how many atoms of each element are present in five formula units of calcium permanganate?

**trigonometry**

At what angle to the x-axis does the graph of y=sin x pass through (0,0)? Give numerical and visual evidence.

**PERSONAL FINANCE**

IF YOU WANT A RISK PROOF REAL ESTATE INVESTMENT, INVEST IN:

**Physics**

A concave mirror is constructed so that a man at a distance of 19 cm from the mirror sees his image magnified 2.0 times. What is the radius of the curvature? OK so I have tried to work this out and can't seem to find the answer. Here is what I got. Please let me know if ...

**math**

what could i use to determine the probability that i will get at least 8 of 15 true or false questions right?

**physics**

Janet jumps off a high diving platform with a horizontal velocity of 2.11 m/s and lands in the water 2.6 s later. How high is the platform? The acceleration of gravity is 9.8 m/s2 .

**Math**

There were 30.7 million people living in Canada in 2000. The population was expected to have a natural growth rate of 1.1% with an additional net migration of .2 million people. A. Write a next-now equation that can be used to predict the canadian pop. for any year into the ...

**Math**

I have 1500 dollars in year 2010 in what year would i reach 2000 dollars at 4% interest?

**College Algebra**

A piling supporting a bridge sits so that 1/4 of the piling is in the sand, 150 feet is in the water, and 3/5 of the piling is in the air. What is the total height of the piling?

**Math**

As a realtor, you earn 7% of the sale price. The owners have the house listed for $150,000 and will entertain offers within 10% of the list price. Write an equality that models the commission you could make on this sale.

**Government**

Write a 1,000-word report on two different ways that you, as a young citizen, can become active in politics that would help promote causes that you believe in. You may choose a specific organization that is politically active. In the report, tell the goals of that organization...

**physics**

0.15

**Math**

Gretchen bought a sweater for $23.89. In addition, she had to pay $1.43 in sales tax. She gave the sales clerk $30. How much change did Gretchen receive from her total purchase?

**physics**

This is the situation I have been given: You are given three capacitors, one with a capacitance of 0.025 micro-farads, another with a capacitance of 0.05 micro farads, and the third with a capacitance of 0.015 micro-farads. Using only these capacitors, arranged in series, ...

**statistics**

1)Let X have a normal distribution with mean 6 and standard deviation 3. a) What is the probability that X > 8.7 2)What is the probability that X<0? 3)What is the probability that |X-6| > 1.9 ? I have got so far: P(Z > 0.9) but I do not know where to go from here! ...

**math**

ken ken puzzle 6* 50* 15+ 2/ 36* 20+ 1 2/ 3/ 9+ 7 2 21* 4* 15* 21+ 3/ 12+ 30+ 6 4* 48* 6 27+ 15* 7 14+ 28+ 14+ 7+ 20* 1 9* 2/ 35* 4/

**Chemistry 120**

I forgot to input the equation. I balanced it and came up with: Al2O3(s)+6NaOH(l)+12HF(g) YIELDS 2Na3AlF6+9H20(g) Then when I converted 13.3 kg Al2O3 to moles and got an answer of 7.6662 moles After that I did the same for NaOH & HF and got: NaOH = 0.6848 moles, HF= 0.3426 ...

**Chemistry 120**

* If 13.3 kilograms of Al2O3(s), 58.4 kilograms of NaOH(l), and 58.4 kilograms of HF(g) react completely, how many kilograms of cryolite will be produced? * Which reactants will be in excess? *What is the total mass of the excess reactants left over after the reaction is ...

**chemistry**

a sample of sodium-24 with an activity of 12 mCi is used to study the rate of blood flow in the circulatory system. If sodium-24 has a half-life of 15 h, what is the activity of the sodium after 2.5 days. please show work.

**chemistry**

why is a factor used to determine the equivalent dose?

**Wine Chemistry**

Is citric acid stronger than tartaric acid?

**chemistry**

How much heat is necessary to raise the temperature of a 15.0g metal from 15 degrees celsius to 25.0 degrees celsius?

**chemistry**

A total of 506 J of heat are added to 50.0 g of water initially at 15.0 degrees Celsius. What is the final temperature of the water?

**Math - LCD**

rg.naja;ogbns

**College Algebra**

A jet flies from Atlanta to Dubuque a distance of 900 miles. After traveling the same amount of time on the return flight,the pilot mentioned they still had 150 miles to go. The airspeed of the plane was 300 miles per hour. How fast was the wind blowing?

**Chemistry**

What is the hybridization of phosphorous in a P4 molecule

**Math**

Alex scored 13 points in the basketball game. This was 1/5 of the total points the team scored. Write and solve an equation to determine the total points t the team score.

**science**

why does the change for the atomic radii of the elements in period 3 look similar to period 2?

**English**

D D B A D B Got 6/6

**Geometry**

Find the coordinate of the midpoint of a segment with the endpoints at –9 and 6. A.1.5 B.–1.5 C.2 D.–3

**Chemistry**

After 1.78 years, 1.990 g of a radioisotope remains from a sample that had an original mass of 2.000 g. Calculate the half-life of the isotope.

**Physics**

I need major help with this please!!! On a safari, a team of naturalists sets out toward a research station located 6.9 km away in a direction 42° north of east. After traveling in a straight line for 2.1 km, they stop and discover that they have been traveling 22° ...

**Math**

4l=9w is the other equation the dimensions should be l=2.7 w=1.2

**chemistry**

is resistant to corrosion physical or chemical

**chemistry**

joules needed to melt a 525 g ice cube at 0 degree C and to warm the liquid to 15 degrees C (two steps please show work)

**Math**

The management of a private investment club has a fund of $114,000 earmarked for investment in stocks. To arrive at an acceptable overall level of risk, the stocks that management is considering have been classified into three categories: high-risk, medium-risk, and low-risk. ...

**Physics**

A driver in a car traveling at a speed of 67 km/h sees a cat 104 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 102 m?

**math**

The Russian mathmatician Pafnuti L. Chebychev pved a remarkable theorem called Chebybchev's Inequality: In any data set, if p is the fraction of the data that lies within k standard deviations to either side of the mean, then p is greater than or equal to 1-1/k^2. a. ...

**math**

how do i solve system by elimination 6x-y=18 2x+y=2

**chemistry**

a fish tank holds 35 gallons of water. how many pounds of water are in the fish tank?

**math**

Explain how you would write the number that is 2 tens more than 53.

**Science**

Container A and B both container the same kind of liquid. Container A has a volume of 5 mL and Container B has a volume of 8 mL. Which container, if either has the highest density? Explain your Answer.

**chemistry**

Water is 11.2% by mass hydrogen. How many kilograms of water would contain 5.0g of hydrogen. (using conversion factors)

**chemistry**

I need answer using conversion factors

**chemistry**

water is 88.8% by mass oxygen. How many grams of water would contain 2.25kg of oxygen?

**math**

suppose a data set has n elements with n greater than or equal to 6. as you know, if n is even, then the median of the set does not have to be an element of the set. for what values of n does the first quartile not have to be an element of the set?