Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 846

**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

**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.

**math**

google it

**AP History**

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

**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?

**math**

20 divided by 4

**math**

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

**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 inje...

**6 grade math**

120lb _ _ $15 = $1

**geometry**

she probably meant bases

**Political Science**

True.

**chemistry**

what type of reaction is Al+S8=Al2S3

**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.

**rosemont**

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

**math**

The answer is D 5ft by 6ft.

**13**

c. is wrong!

**13**

c. is wrong!

**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) Wh...

**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...

**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 h...

**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.

**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 h...

**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 ...

**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 ...

**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 d...

**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 ...

**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 d...

**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.

**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 a...

**math**

what does 7/10 mean

**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.

**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 ...

**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?

**Physics**

it says it was incorrect

**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 ...

**Physics**

this is da girl angel bro ~~~

**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

**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

**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 ...

**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

**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

**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

**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 o...

**Physics**

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

**Physics**

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

**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

**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

**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)

**Physics**

Last question.. sorry PL = Pie?

**Physics**

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

**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..

**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.

**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 ...

**Algebra**

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

**Algebra**

Solve this quadratic eqution: 6a^2 + 13a + 6=0 (^2 means squared...sorry for confusion...)

**Physics**

A worker drives a 0.509 kg spike into a rail tie with a 2.08 kg sledgehammer. The hammer hits the spike with a speed of 63.3 m/s. If one ﬁfth of the hammer’s kinetic energy is converted to the internal energy of the hammer and spike, how much does the total interna...

**Human Services**

Creating a Budget Various budget approaches play an important role in resource allocation in human service organizations. You are the executive director for a local government workforce agency that focuses on providing career- and work-related skills. The Department of Educati...

**physics**

The specific heat of mercury is .03cal/g*C, and it's boiling point is 357*C. The specific heat of water is 1 cal/g*C. It takes 65 calories of energy to vaporize one gram of mercury and 540 calories to vaporize one gram of water. If both substances begin at about 22*C does ...

**Thermodynamics- Fluids Mechanics**

The viscosity of a fluid is to be measured by a viscometer constructed of two 3-ft-long concentric cylinders. The inner diameter of the outer cylinder is 6 in, and the gap between the two cylinders is 0.05 in. The outer cylinder is rotated at 250 rpm, and the torque is measure...

**physics**

Uhm this is not a direct answer but there was a question asked about this through out the Website time of 3:00 p.m -5:00 p.m You may want to check it out so you can have atleast an equation to do this.

**Physics**

A 42.5 kg student runs down the sidewalk and jumps with a horizontal speed of 4.16 m/s onto a stationary skateboard. The student and skateboard move down the sidewalk with a speed of 3.97 m/s. a) Find the mass of the skateboard.

**Physics**

A 1.46 × 10 4 kg railroad car moving at 7.05 m/s to the north collides with and sticks toanother railroad car of the same mass that is moving in the same direction at 1.76 m/s. What is the velocity of the joined cars after the collision? Answer in units of m/s

**Physics**

Yes, I got it. Thank you

**Physics**

So basically 1500 * 17.6?

**Physics**

A 1500 kg car traveling at 17.6 m/s to the south collides with a 5000 kg truck that is initially at rest at a stoplight. The car and truck stick together and move together after the collision. What is the ﬁnal velocity of the two-vehicle mass? Answer in units of m/s

**Math**

300 cm = 3m. It says is it possible a shape has a perimeter of 3 cm. It would have to be a very weird looking shape for it to have a legnth like that, but it is possible.

**Physics**

A 2.7 kg ball strikes a wall with a velocity of 7.6 m/s to the left. The ball bounces oﬀ with a velocity of 5.2 m/s to the right. If the ball is in contact with the wall for 0.23 s, what is the constant force exerted on the ball by the wall? Answer in units of N

**Science**

What does a topographic PROFILE (NOT MAP) tell you about an area?

**Geomotry**

how do i find the coordinates of the midpoint of a segment having given the endpoint? K(-9,3),H(5,7)

**Geomotry**

Thank you, Damon

**Geomotry**

what is the Distance Fomula & midpoint formula?

**math**

jasmine has 41lb of dog food to pour into 5 dishes. How many pounds of dog food should she pour in each dish?

**math**

write the missing raduis or diameter. 1) d =________ 5) d = 4 3/4 in r = 21cm r =_________ 2) d =_______ r = 26.3 dm 6)d = 3 yds r = 3) d =_______ r = 14 m 4) d = 18.4 ft r = __________

**math**

write the missing raduis or diameter. 1) d =________ 5) d = 4 3/4 in r = 21cm r =_________ 2) d =_______ r = 26.3 dm 6)d = 3 yds r = 3) d =_______ r = 14 m 4) d = 18.4 ft r = __________

**math**

write the missing raduis or diameter. 1) d =________ 5) d = 4 3/4 in r = 21cm r =_________ 2) d =_______ r = 26.3 dm 6)d = 3 yds r = 3) d =_______ r = 14 m 4) d = 18.4 ft r = __________

**math**

write the missing radius or diameter. 1) d =________ r =21cm

**math**

write the missing radius or diameter. 1) d =________ r =21cm

**Math**

A little help, please!!! :-)

**Math**

What I don't get is that in my book the question is {2x - 3= - 5y and -2y = -3y + 1}. How do I put the question in standard form?

**Math**

Thanks!!!

**Math**

Could someone give me an example of a linear eqution using elimination to solve the systems of equations?

**science**

atoms in the same column on the periodic table have?

**math**

thanks

**math**

.004999 to the nearest hundreth

**Alegbra/ Chemistry**

When I tried your equations I did not receive the right values.

**Alegbra/ Chemistry**

Thank you so much.

**Alegbra/ Chemistry**

Q (ft3/min) : 3.9, 7.9, 11.8, 15.7, 19.6, 23.6, 27.5, 31.4, 35.3, 39.3 Delta P (psi): 0.13, 0.52, 1.18, 2.09, 3.27, 4.71, 6.41, 8.37, 10.59, 13.08 My professor gave the information above and wants us to come up with a linear equation that relates Q and square root of delta P. ...

**Chemistry **

I'm not sure how to find a linear equation for this problem. One common flow measurement device is the orifice meter, which consists of a disk with a machined hole. It is placed as an obstruction to flow in a pipe, causing pressure drop to occur as the fluid in the pipe go...

**Science**

What is the Range of Temperature of LukeWarm Water in Farenheit. Like 72 degrees to 89 degrees. Somewhat like that. please Help.

**Geometry**

The Design for a Mural is 16 in. Wide and 9 in High. What are the Dimensions of the largest possible complete mural that can be painted on a wall 24 ft wide by 14 ft wide? And Can you Please Explain. I understood how to do it. but which height or width will fill the space firs...

**Physics**

A 0.250 kg block on a vertical spring with a spring constant of 4.09 × 10 3 N/m is pushed downward, compressing the spring 0.0900 m. When released, the block leaves the spring and travels upward vertically. The acceleration of gravity is 9.81 m/s 2 . How high does it ris...

**Physics**

A spring has a force constant of 546.5 N/m. Find the potential energy stored in the spring when the spring is a) stretched 4.18 cm from equilibrium. Answer in units of J

**Physics**

When a rattlesnake strikes, its head accelerates from rest to a speed of 26 m/s in 0.3 s seconds. Assume for simplicity that the only moving part of the snake is its head of mass 100 g. How much (average) power does the rattlesnake need to accelerate its head that fast? Answer...

**Physics**

A student, late for class, ran up some stairs between landings. The landings are 8.2 m apart. The student has a mass of 54.1 kg and it took 7 s to do the run. The acceleration of gravity is 9.8 m/s 2 . What is the average power that the student was generating during the run?

**math**

To win $1 million, you must draw two cards whose sum is nine, from a stack of cards numbered 1 through 10. After the first draw, you replace the card and shuffle the stack again for the second draw. What is the chance your two cards will have a sum of nine?

**Physics**

Suppose that a simple pendulum consists of a small 71.8 g bob at the end of a cord of negligible mass. If the angle è between the cord and the vertical is given by è = (0.0465 rad) cos[(6.52 rad/s) t + ö], what are (a) the pendulum's length and (b) its m...

**Physics**

Please guide me in the right direction, am so confused with this problem. A pendulum of length L is caused to swing by releasing it at an initial angle theta0 from the vertical. Because of air drag and friction in the mounting, the pendulum will eventually stop swingin...

**Science-chemistry**

A compound is found to have 56.4% potassium, 8.7% carbon, and 34.9% oxygen. What is the empirical formula?

**Cedar High school**

A compound is found to have 56.4% potassium, 8.7% carbon, and 34.9% oxygen. What is the empirical formula?

**geometry**

If the area of a trapezoid is 209 square yards and the bases are 15 yards and 23 yards. What is the height of the trapezoid?

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