Tuesday

October 25, 2016
Total # Posts: 1,099

**Physics**

A balloon rubbed against denim gains a charge of −2.0 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5.0 cm? (Assume that the charges are located at a point.) The value of the Coulomb constant is 8.98755...

*April 29, 2012*

**MATH**

The cumulative number of car accidents from 2000 to 2010 can be modeled by the quadratic expression, C=-42x^2+924x+14,112, where x=1 corresponds to 2001, and so on until x=11 corresponds to 2010. Find the number of cumulative car accidents in 2003. Use the table of values to ...

*April 29, 2012*

**MATH**

If C dollars are deposited in an account paying r percent annual interest, the amount after x years is A+C(1+r)*. Approximate the amount in the account after x years, when C=$100.00, r=19%, and x-15 years.

*April 29, 2012*

**MATH**

The cumulative number of car accidents from 2000 to 2010 can be modeled by the quadratic expression, C=-42x^2+924x+14,112, where x=1 corresponds to 2001, and so on until x=11 corresponds to 2010. Find the number of cumulative car accidents in 2003. Use the table of values to ...

*April 29, 2012*

**MATH**

A rectangle pen for a pet is 5 feet longer than it is wide. Give possible values for the width W of the pen if its area must be between 266 and 750 square feet, inclusively. The width of the pen from the smaller value of the width is how many feet to the larger value of the ...

*April 29, 2012*

**math**

If C dollars are deposited in an account paying r percent annual interest, approximate the amount in the account after X years if c=$250, r=2.4% and x=23 years?

*April 20, 2012*

**math**

The population P in 1995 for a state is given along with r, its annual percentage3 rate of a continuous growth. P=16 millions, r=1.2% Write the formula f(x) =Pe^yx, where r is in a decimal notation, that models the population in millions x years in 1995.

*April 19, 2012*

**math**

In 2000 the population of a state was 5 million and growing continuously at a rate of 3.4% per year. a) Write a function that models the state’s population in millions x years after 200. b) Graph f in 0,10,1 by 4,7,1 c) Estimate the state’s population in 2007.

*April 19, 2012*

**math**

Biologist have have found that the weight W of a bird and the length L of it’s wing span are related by L=kW1/3, where k is a constant. The following list L and W for one species of bird. What is the value of k? W kilograms0.1 0.4 0.8 1.1 L meters 0.399 0.634 0.798 0.888

*April 19, 2012*

**math**

The total hang time T in seconds, is given by T(h)=^h/2. Where h is the maximum height. If a person jumps 6 ft off the ground, determine for how many seconds the person is in the air.

*April 19, 2012*

**math**

find function values f(x)=9x^2+10x-8

*April 19, 2012*

**word problem**

A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 80 feet of fence? What should the dimensions of the garden be to give the area?

*April 18, 2012*

**Algebra**

For what values of x is x/[x(3x-4)] undefined?

*April 16, 2012*

**Physics**

Light falls on a double slit with slit separation of 2.19 × 10 −6 m, and the ﬁrst bright fringe is seen at an angle of 12.7 ◦ relative to the central maximum. What is the wavelength of the light? Answer in units of nm Can the person post the steps and ...

*April 10, 2012*

**Physics**

It says incorrect. Can you explain the process?

*April 10, 2012*

**Physics**

Light falls on a double slit with slit separation of 2.19 × 10 −6 m, and the ﬁrst bright fringe is seen at an angle of 12.7 ◦ relative to the central maximum. What is the wavelength of the light? Answer in units of nm

*April 10, 2012*

**Physics**

Im sorry to ask again but what equation did you use? Can you list the steps you did please? So I can answer the next few questions by myself.

*April 10, 2012*

**Physics**

A pair of narrow parallel slits separated by a distance of 0.253 mm are illuminated by the green component from a mercury vapor lamp (λ = 545.1 nm). What is the angle from the central maximum to the ﬁrst bright fringe on either side of the central maximum? Answer ...

*April 10, 2012*

**Physics**

And where did you get those numbers?

*April 10, 2012*

**Physics**

Excuse me what was the equation you used? Because the answer is wrong.

*April 10, 2012*

**Physics**

A double-slit interference experiment is performed with light from a laser. The separation between the slits is 0.58 mm, and the ﬁrst-order maximum of the interference pattern is at an angle of 0.060 ◦ from the center of the pattern. What is the wavelength of the ...

*April 10, 2012*

**calc**

Let f(x)=x^3-3x^2 find the absolute maximum value of f(x) on the interval [1,4]? 22 hours ago - 3 days left to answer

*April 5, 2012*

**calc**

A____________B 9 miles is between A and B? at 3pm Andy began travelling South at a rate of 4mi/hr from point A at the same time Bill began travelling West at a rate of 5mi/hr from point B to A both stop wlking when Bill reaches point A What time will the distance between Bill ...

*April 5, 2012*

**11th grade algebra 2**

(1-7) write each function in vertex form (8-10) write each funtion in standard form? 1) Y=x^2+3x-10 2) Y=x^2-9x 3) Y=X^2+x 4) Y=x^2+5x+4 5) Y=4x^2+8x-3 6) Y=(3/4)x^2+9x 7) Y=-2x^2+2x+1 8) Y=(x-3)^2+1 9) Y=2(x-1)^2-3 10)Y=-3(x+4)^2+1

*April 5, 2012*

**Algebra 2**

(1-7) write each function in vertex form (8-10) write each funtion in standard form? 1) Y=x^2+3x-10 2) Y=x^2-9x 3) Y=X^2+x 4) Y=x^2+5x+4 5) Y=4x^2+8x-3 6) Y=(3/4)x^2+9x 7) Y=-2x^2+2x+1 8) Y=(x-3)^2+1 9) Y=2(x-1)^2-3 10)Y=-3(x+4)^2+1

*April 5, 2012*

**Physics**

Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 29.8 cm) 10.4 cm away from an object. Find the image distance. Answer in units of cm Find the magniﬁcation.

*April 1, 2012*

**physics**

disregard

*April 1, 2012*

**physics**

A ray of light of vacuum wavelength 550 nm traveling in air enters a slab of transparent material. The incoming ray makes an angle of 37.4◦ with the normal, and the refracted ray makes an angle of 22.0◦ with the normal. Find the index of refraction of the ...

*April 1, 2012*

**Physics**

An object 3.35 cm tall is placed 10.8 cm in front of a mirror, which creates an upright image that is 5.61 cm in height. a) What is the magniﬁcation of the image?

*April 1, 2012*

**Physics**

disregard

*April 1, 2012*

**Physics**

The image of a crayon appears to be 20.6 cm behind the surface of a convex mirror and is 1.64 cm tall. The mirror’s focal length is 54.3 cm. a) How far in front of the mirror is the crayon positioned? Answer in units of cm I keep on getting it wrong so the answer & ...

*April 1, 2012*

**physics**

I keep getting error

*April 1, 2012*

**physics**

do I put my calculator in degrees?

*April 1, 2012*

**physics**

A ray of light traveling in air strikes the surface of a liquid. If the angle of incidence is 33.5◦ and the angle of refraction is 19.8◦, ﬁnd the critical angle for light traveling from the liquid back into the air. Answer in units of◦

*April 1, 2012*

**Physics**

do I have to convert GHz?

*April 1, 2012*

**Physics**

What is the wavelength of a radar signal that has a frequency of 30 GHz? The speed of light is 3 × 10^8 m/s. Answer in units of m Giving me the formula is just fine

*April 1, 2012*

**Physics**

Consider a concave mirror with a focal length of 14.04 cm. b) Find the image distance when the object distance is 7.02 cm c) Find the magniﬁcation of the image for part b Giving me the formulas is just fine

*April 1, 2012*

**Global History**

Sorry this is not very detailed...I checked my textbook but couldn't find any information. How did the Islamic Conquest impact India? Thanks so much in advance :)

*March 31, 2012*

**Physics**

A spherical glass ornament is 7.00 cm in diameter. An object is placed 11.8 cm away from the ornament. a) Where will its image form? b) What is the magniﬁcation of the image

*March 29, 2012*

**Physics**

A concave makeup mirror is designed so that a person 25.3 cm in front of it sees an upright image at a distance of 54.0 cm behind the mirror. a) What is the radius of curvature of the mirror? Answer in units of cm

*March 29, 2012*

**physics**

How did you get 20.6?

*March 28, 2012*

**Physics**

The image of a crayon appears to be 20.6 cm behind the surface of a convex mirror and is 3.32 cm tall. The mirror’s focal length is 52.6 cm. a) How far in front of the mirror is the crayon positioned? b) Calculate the magniﬁcation of the image

*March 27, 2012*

**Physics**

Consider a concave mirror with a focal length of 14.98 cm. a) Find the image distance when the object distance is 14.98 cm. (Answer with −1000 if the image does not exist.) That's the whole question..

*March 27, 2012*

**Physics**

Why is it infinity?

*March 27, 2012*

**Physics**

Consider a concave mirror with a focal length of 14.98 cm. a) Find the image distance when the object distance is 14.98 cm

*March 27, 2012*

**Physics**

Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0 × 10 21 Hz. The speed of light is 3 × 10 8 m/s. What is the wavelength of these gamma rays?

*March 27, 2012*

**Physics**

What is the frequency of an electromagnetic wave if it has a wavelength of 1.4 km? The speed of light is 3 × 10 8 m

*March 27, 2012*

**English**

what kind of sentence is this? Arabic numbers were being used for the first time the concept "0" was baffling to many they wondered how a zero could for standing.

*March 27, 2012*

**math**

google it

*March 20, 2012*

**AP History**

What was the Talented Tenth? Who proposed it & why?

*March 20, 2012*

**AP History**

What was the impact of Eli Whitney's interchangeable parts concept and what impact did Eli Whitney's cotton gin have? Why was the cotton gin so important?

*March 20, 2012*

**math**

20 divided by 4

*March 20, 2012*

**math**

one fourth of the childern in room 20 have dogs how many kids have dogs

*March 20, 2012*

**Chemistry**

Dinitrogen tetroxide decomposes according to N2O4 (g) = 2NO2 (g) In a certain experiment, N2O4(g) at an initial pressure of 0.554 bar is introduced into an empty reaction container; after equilibrium is established, the total pressure is 0.770 bar. A quantity of NO2(g) is ...

*March 19, 2012*

**6 grade math**

120lb _ _ $15 = $1

*March 19, 2012*

**geometry**

she probably meant bases

*March 18, 2012*

**Political Science**

True.

*March 14, 2012*

**chemistry**

what type of reaction is Al+S8=Al2S3

*March 14, 2012*

**geometry**

Well, across line L, it would be just the opposite. It would basically be a backwards D. Then across line M it would be a regular looking D again.

*March 13, 2012*

**rosemont**

a pizza was sliced 10 pieces. bill ate 2/10 of the pizza how much of the pizza was left?

*March 10, 2012*

**math**

The answer is D 5ft by 6ft.

*March 6, 2012*

**13**

c. is wrong!

*March 4, 2012*

**Statistics **

Suppose that the birth weight of newborn babies in the U.S is normally distributed with a mean of 7 pounds and a standard deviation of 1.6 pounds. Let the random variable X be the birth weight of a randomly selected record of live birth. a) What is the distribution of X? b) ...

*March 2, 2012*

**Statistics **

Suppose it is observed that, on average, 35 people are admitted to the intensive care unit of a particular hospital every week. Let the random variable X represent the number of people admitted to this intensive care unit on any particular day. a) What is the distribution of X...

*March 2, 2012*

**Statistics**

Suppose a basketball player, Player A, made 80% of her free throw attempts last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws that player A makes in ...

*March 2, 2012*

**Statistics**

a) What is the distribution of X? b) Find the mean and standard deviation of X. c) Find the probability that player A makes exactly 10 free throws. d) Find the probability that player A makes at least 8 free throws.

*March 2, 2012*

**Statistics **

Suppose a basketball player, Player A, made 80% of her free throw attempts last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws that player A makes in ...

*March 2, 2012*

**physics please help :/**

A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...

*March 1, 2012*

**physics**

A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...

*February 29, 2012*

**physics**

A ski trail makes a vertical descent of 77 m. A novice skier, unable to control his speed, skis down this trail and is lucky enough not to hit any trees. If the skier is moving at 17 m/s at the bottom of the trail, calculate the total work done by friction and air resistance ...

*February 29, 2012*

**physics**

A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...

*February 28, 2012*

**physics**

A ski trail makes a vertical descent of 77 m. A novice skier, unable to control his speed, skis down this trail and is lucky enough not to hit any trees. If the skier is moving at 17 m/s at the bottom of the trail, calculate the total work done by friction and air resistance ...

*February 28, 2012*

**engineering**

A steady, two-dimensional velocity field is given by V = (u, v) = (1.35 + 2.78x - 0.896y)i + (3.45x + cx - 2.78y)j Calculate constant c such that the flow field is irrotational.

*February 27, 2012*

**Chemistry **

If you can show me an example of one problem, I have no idea how to approach this. Calculate where the number 40.67 came from. Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this equation relates the change in vapor pressure ...

*February 26, 2012*

**science**

a ball rolls 5cm in 5 seconds what is the speed of the ball?

*February 25, 2012*

**math**

what does 7/10 mean

*February 24, 2012*

**Business Math**

Model the data using an exponential function f(x) = Ab^x. x ,0 ,1 ,2 f(x) ,800 ,480 ,288 Like 800-480=320 and 480-288=192 How do I find the exponential form? Thank you.

*February 22, 2012*

**Algebra**

As Sales Manager for Montevideo Productions, Inc., you are planning to review the prices you charge clients for television advertisement development. You currently charge each client an hourly development fee of $2,600. With this pricing structure, the demand, measured by the ...

*February 21, 2012*

**College Math**

Only 43% ofthe carbon-14 in an artifact remains. How old is the artifact? Would the answer be less than the half life?

*February 19, 2012*

**Physics**

it says it was incorrect

*February 16, 2012*

**Physics**

The body of a 1297 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.24 × 10 4 N/m. Four people riding in the car have a combined mass of 259 kg. When driven over a pothole in the road, the frame vibrates and for the ﬁrst ...

*February 16, 2012*

**Physics**

this is da girl angel bro ~~~

*February 16, 2012*

**Physics**

A mass of 0.40 kg is attached to a spring and is set into vibration with a period of 0.15 s. What is the spring constant of the spring? Answer in units of N/m

*February 16, 2012*

**Physics**

A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 50.0 vibrations in 26.6 s. A given crest of the wave travels 355 cm along the rope in a time period of 12.1 s. What is the wavelength? Answer in units of m

*February 16, 2012*

**Physics**

The body of a 1269 kg car is supported on a frame by four springs. The spring constant of a single spring is 2.75 × 10 4 N/m. Four people riding in the car have a combined mass of 256 kg. When driven over a pothole in the road, the frame vibrates and for the ﬁrst ...

*February 16, 2012*

**Physics**

What is the free-fall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s

*February 16, 2012*

**Physics**

The distance between two successive crests of a certain transverse wave is 1.42 m. Eight crests pass a given point along the direction of travel every 19.5 s. Calculate the wave speed. Answer in units of m/s

*February 16, 2012*

**Physics**

Microwaves travel at the speed of light, 3.00× 108 m/s. When the frequency of microwaves is 3.67× 109 Hz, what is their wavelength? Answer in units of m

*February 16, 2012*

**Physics**

Part(1 of 3) You dip your ﬁnger into a pan of water twice each second, producing waves with crests that are separated by 0.17 m. Determine the frequency of these water waves. Answer in units of Hz Part(2 of 3) Determine the period of these water waves. Answer in units ...

*February 15, 2012*

**Physics**

Oh I'm sorry. Really stressed and can't think straight.

*February 15, 2012*

**Physics**

What would be the wavelength of the wave produced by this tuning fork in water in which sound travels at 1500 m/s?

*February 15, 2012*

**Physics**

A tuning fork produces a sound with a frequency of 277 Hz and a wavelength in air of 1.21 m. What value does this give for the speed of sound in air? Answer in units of m/s

*February 15, 2012*

**Physics**

A piano emits frequencies that range from a low of about 28 Hz to a high of about 4200 Hz. Find the maximum wavelength in air attained by this instrument when the speed of sound in air is 336 m/s. Answer in units of m

*February 15, 2012*

**Physics**

I keep getting the question wrong. I think I put it wrong in my caculator. I put (2<Pie>.594)^2.594/(1.55^2)

*February 15, 2012*

**Physics**

Last question.. sorry PL = Pie?

*February 15, 2012*

**Physics**

By following your equation I got: 5.797880106 If I rearrange it would be: T^2 = 2(Pie)L/G then what?

*February 15, 2012*

**Physics**

I kinda have no clue what you responded. The equation I have is: T=2(Pie)*Sqt(L/G) I need to re-arrange that..

*February 15, 2012*

**Physics**

What is the free-fall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s^2 Show equation too please.

*February 15, 2012*

**Statistics**

A manufacturer of a low-tar cigarette claims that their cigarettes contain an average of 16.3 mg of tar with a standard deviation of 3.1 mg per cigarette. How many sample cigarettes must the manufacturer observe to be 99% confident that the width of the confidence interval is ...

*February 12, 2012*

**Algebra**

Nevermind I figured it out. Thanks for noting people. So called "tutors".

*February 2, 2012*