Thursday

August 28, 2014

August 28, 2014

Total # Posts: 856

**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*

**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*

**Algebra**

Solve this quadratic eqution: 6a^2 + 13a + 6=0 (^2 means squared...sorry for confusion...)
*February 2, 2012*

**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 ...
*February 1, 2012*

**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 ...
*February 1, 2012*

**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 ...
*January 25, 2012*

**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 ...
*January 22, 2012*

**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.
*January 22, 2012*

**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.
*January 22, 2012*

**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
*January 22, 2012*

**Physics**

Yes, I got it. Thank you
*January 22, 2012*

**Physics**

So basically 1500 * 17.6?
*January 22, 2012*

**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
*January 22, 2012*

**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.
*January 22, 2012*

**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
*January 22, 2012*

**Science**

What does a topographic PROFILE (NOT MAP) tell you about an area?
*January 19, 2012*

**Geomotry**

how do i find the coordinates of the midpoint of a segment having given the endpoint? K(-9,3),H(5,7)
*January 12, 2012*

**Geomotry**

Thank you, Damon
*January 12, 2012*

**Geomotry**

what is the Distance Fomula & midpoint formula?
*January 12, 2012*

**math**

jasmine has 41lb of dog food to pour into 5 dishes. How many pounds of dog food should she pour in each dish?
*January 10, 2012*

**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 = __________
*January 9, 2012*

**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 = __________
*January 9, 2012*

**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 = __________
*January 9, 2012*

**math**

write the missing radius or diameter. 1) d =________ r =21cm
*January 9, 2012*

**math**

write the missing radius or diameter. 1) d =________ r =21cm
*January 9, 2012*

**Math**

A little help, please!!! :-)
*January 2, 2012*

**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?
*January 2, 2012*

**Math**

Thanks!!!
*January 2, 2012*

**Math**

Could someone give me an example of a linear eqution using elimination to solve the systems of equations?
*January 2, 2012*

**science**

atoms in the same column on the periodic table have?
*January 1, 2012*

**math**

thanks
*December 26, 2011*

**math**

.004999 to the nearest hundreth
*December 26, 2011*

**Alegbra/ Chemistry**

When I tried your equations I did not receive the right values.
*December 15, 2011*

**Alegbra/ Chemistry**

Thank you so much.
*December 15, 2011*

**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. ...
*December 15, 2011*

**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 ...
*December 14, 2011*

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