# Posts by Rock

Total # Posts: 68

**math**

68

*May 25, 2016*

**Science**

How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused

*May 22, 2015*

**The Giver**

I disagree, and that was your last chance.

*May 22, 2015*

**The Giver**

which one would you pick?

*May 22, 2015*

**The Giver**

2 and 3 are right re- check #1

*May 22, 2015*

**The Giver**

yea sure

*May 22, 2015*

**chemistry**

In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 21.91 °C to 26.41 °C. If the solution has the same density and specific heat as water, what is ÄH ...

*February 20, 2015*

**Science help please**

Solar Panel

*January 8, 2015*

**electrical Circuits**

A 72-ohm coil of wire is connected in series with an adjustable resistor (rheostat) whose resistance can be varied from 0 to 88 ohms. If the line potential is 115 volts, calculate (a) the range through which the coil current can be varied, (b) the rheostat resistance when the ...

*August 24, 2014*

**physics**

In one day, a 85 kg mountain climber ascends from the 1440 m level on a vertical cliff to the top at 2360 m . The next day, she descends from the top to the base of the cliff, which is at an elevation of 1310 m . a) What is her gravitational potential energy on the first day? ...

*January 6, 2014*

**Chemistry 20 titration**

up

*October 22, 2012*

**Chemistry 20 titration**

1) oi50 . tinypic . com / ejh6vm . jpg The most suitable indicator for the titration is: A)methyl violet B)chlorophenol red C)methyl orange D)phenolphthalein 2-A base is titrated with an acid solution until the indicator changes colour. This change in the colour of the ...

*October 22, 2012*

**sCIENCE PLZZZZZZZZ HELP**

BADD

*April 11, 2012*

**Alg2**

387.187

*December 13, 2011*

**Alg2**

Please Help... You buy a commemorative coin for $25. The value of the coin increases 3.25% per year. How much will the coin be worth in 15 years? Round to the nearest cent.

*December 13, 2011*

**Alg 2**

Suppose you deposit a principal amount of p dollars in a bank account that pays compound interest. If the annual interest rate r (expressed as a decimal) and the bank makes interest payments n times every year, the amount of money A you would have after t years is given by ...

*December 13, 2011*

**Alg 2**

Please Help... You buy a commemorative coin for $25. The value of the coin increases 3.25% per year. How much will the coin be worth in 15 years? Round to the nearest cent.

*December 13, 2011*

**Alg2**

Help....Help... Suppose you deposit a principal amount of p dollars in a bank account that pays compound interest. If the annual interest rate r (expressed as a decimal) and the bank makes interest payments n times every year, the amount of money A you would have after t years...

*December 12, 2011*

**Alg2**

Help...Please... You buy a commemorative coin for $25. The value of the coin increases 3.25% per year. How much will the coin be worth in 15 years? Round to the nearest cent.

*December 12, 2011*

**Alg2**

Can't figure this one out...The Mendes family bought a new house 10 years ago for $120,000. The house is now worth $191,000. Assuming a steady rate of growth, what was the yearly rate of appreciation? Round your answer to the nearest tenth of a percent (1.2% etc)

*December 11, 2011*

**Alg2**

the annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, ...

*December 9, 2011*

**Alg2**

An anthropologist finds there is so little remaining Carbon-14 in a prehistoric bone that instruments cannot measure it. This means that there is less than 0.5% of the amount of Carbon-14 the bones would have contained when the person was alive. How long ago did the person die...

*December 9, 2011*

**Alg2**

Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.

*December 8, 2011*

**Alg2**

he annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, ...

*December 7, 2011*

**Alg2**

The Mendes family bought a new house 10 years ago for $120,000. The house is now worth $191,000. Assuming a steady rate of growth, what was the yearly rate of appreciation? Round your answer to the nearest tenth of a percent (1.2% etc)

*December 6, 2011*

**Alg2**

The annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, ...

*December 6, 2011*

**Alg2**

An anthropologist finds there is so little remaining Carbon-14 in a prehistoric bone that instruments cannot measure it. This means that there is less than 0.5% of the amount of Carbon-14 the bones would have contained when the person was alive. How long ago did the person die...

*December 6, 2011*

**Alg2**

Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.

*December 6, 2011*

**Alg2**

Zeus Industries bought a computer for $2500. It is expected to depreciate at a rate of 20% per year. What will the value of the computer be in 2 years?

*December 6, 2011*

**Alg2**

I can See It!!! I was multiplying 600 & 2 together... Thanks :)

*December 4, 2011*

**Alg2**

Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?

*December 4, 2011*

**Alg2**

Thanks, I did!

*December 4, 2011*

**Alg2**

Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?

*December 4, 2011*

**Alg2**

240

*December 4, 2011*

**Alg2**

How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be on an end?

*December 4, 2011*

**Alg2**

YaY!!!!!

*December 4, 2011*

**Alg2**

For a college application, Macawi must select one of five topics on which to write a short essay. She must also select a different topic from the list for a longer essay. How many ways can she choose the topics for the two essays?

*December 4, 2011*

**Alg2**

I need help with problem solving...

*December 4, 2011*

**Alg2**

I need more help

*December 4, 2011*

**Alg2**

A video store has 8 new releases this week. Each is available on videotape and on DVD. How many ways can a customer choose a new release and a format to rent? answer here How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it ...

*December 3, 2011*

**Alg2**

# of possibilities of arrangements for the word intercept?

*December 3, 2011*

**Alg2**

what are the # of possibilities of buying 2 CD's from 10 that are on sale?

*December 1, 2011*

**Alg2**

what is the number of possibilities of arrangements of the letters in the word intercept?

*November 30, 2011*

**Alg2**

what is the # of possibilities of buying 2 CD's from 10 that are on sale?

*November 30, 2011*

**Alg2**

how many ways can 5 members of the 100 member US senate be chosen to be put on a committe?

*November 30, 2011*

**math**

on his first exam, he studied for 10 hours and went to tell the mall for 4hours, and got a score of 85. how long should he study to get a grade of 96 and go to the mall for 17 hours? grade varies directly with studying and inversely with going to the mall. is the answer 48hrs?

*August 2, 2011*

**college algeb**

when ax^2+bx+c is divided by x-1, the remainder is 10 if the same poly. is divided by x+2 the remainder is 1. x+1 is a factor of the polynomial. Find a,b, and c.

*July 20, 2011*

**physics**

Part (a) of the figure below is a partial graph of the position function x(t) for a simple harmonic oscillator with an angular frequency of 1.00 rad/s; Part (b) of the figure is a partial graph of the corresponding velocity function v(t). The vertical axis scales are set by xs...

*February 4, 2011*

**physics (shm)**

I got .41 m for L in part a and trying to figure out part B!!!

*February 4, 2011*

**physics (shm)**

Suppose that a simple pendulum consists of a small 55.0 g bob at the end of a cord of negligible mass. Suppose that the angle between the cord and the vertical is given by θ = (0.0800 rad) cos[(4.91 rad/s)t + ϕ]. (a) What is the pendulum's length? units in m (b) ...

*February 4, 2011*

**physics (simple harmonic motion)**

If the phase angle for a block-spring system in SHM is π/5 rad and the block's position is given x = xm cos(ωt + ϕ), what is the ratio of the kinetic energy to the potential energy at time t = 0?

*February 4, 2011*

**simple harmonic motion.**

A 5.80 kg object on a horizontal frictionless surface is attached to a spring with spring constant 860 N/m. The object is displaced from equilibrium 50.0 cm horizontally and given an initial velocity of 9.9 m/s back toward the equilibrium position. (a) What is the frequency of...

*February 4, 2011*

**physics**

I got part a) 166.25 b)?

*January 28, 2011*

**physics**

In the figure below, the fresh water behind a reservoir dam has depth D = 13 m. A horizontal pipe 6.0 cm in diameter passes through the dam at depth d = 6.0 m. A plug secures the pipe opening. (a) Find the magnitude of the frictional force between plug and pipe wall. 1Your ...

*January 28, 2011*

**physics**

The intake in the figure has cross-sectional area of 0.75 m2 and water flow at 0.41 m/s. At the outlet, distance D = 180 m below the intake, the cross-sectional area is smaller than at the intake and the water flows out at 9.6 m/s. What is the pressure difference between inlet...

*January 28, 2011*

**physics**

thanks

*January 28, 2011*

**physics**

Three liquids that will not mix are poured into a cylindrical container. The volumes and densities of the liquids are 0.35 L, 2.6 g/cm3; 0.25 L, 1.0 g/cm3; and 0.40 L, 0.60 g/cm3. What is the force on the bottom of the container due to these liquids? One liter = 1 L = 1000 cm3...

*January 28, 2011*

**physics**

the merging of two streams to form a river. One stream has a width of 8.9 m, depth of 3.5 m, and current speed of 2.1 m/s. The other stream is 6.5 m wide and 3.7 m deep, and flows at 2.2 m/s. The width of the river is 10.7 m, and the current speed is 3.1 m/s. What is its depth?

*January 28, 2011*

**physics**

the merging of two streams to form a river. One stream has a width of 8.9 m, depth of 3.5 m, and current speed of 2.1 m/s. The other stream is 6.5 m wide and 3.7 m deep, and flows at 2.2 m/s. The width of the river is 10.7 m, and the current speed is 3.1 m/s. What is its depth?

*January 28, 2011*

**chemistry**

Its easy

*August 30, 2010*

**Integers**

Suppose a1, a2, . . . , an is a list of n numbers with the following properties: The sum of those n numbers is 500. The sum of the smallest three of those numbers is 48. The sum of the largest two of those numbers is 35. (Note: There might be some repetitions among the numbers...

*April 15, 2010*

**math**

n+6.5=12 Subtract 6.5 from 12 to find your answer.

*January 25, 2007*

**math**

n-31/2=12 what is 2+2 do you all know any website that help you with your homework Yes. This website has many teachers who will help you with your homework. Please post your question. 2 = 1+1 2 + 2 = (1+1) + (1+1) = 1 + 1 + 1 + 1 = 4

*January 25, 2007*

**math**

n+1.5=12 n + 1.5 = 12 n = 12 - 1.5 What do you think n equals?

*January 25, 2007*

**physics.**

A vertically upward since that is the direction of centripetal acceleration at that time.

*December 28, 2006*

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