Sunday

April 19, 2015

April 19, 2015

Total # Posts: 1,964

**Math**

if its linear, its a straight line. If its a quadratic, it looks like either a hill or a valley. It makes an arc. If its exponential, its a curve
*October 1, 2012*

**Calculus**

Never mind. I figured it out. L(x,y) = f(2,5) + fx(2,5)(x-2) + fy(2,5)(y-5) L(x,y) = 6 + 1(x-2) - 1(y-5) = 6+x-2-y+5 = x-y+9 L(2.2,4.9) = 2.2-4.9+9=6.3
*September 30, 2012*

**Calculus**

Given that f is a differentiable function with f(2,5) = 6, fx(2,5) = 1, and fy(2,5) = -1, use a linear approximation to estimate f(2.2,4.9). The answer is supposed to be 6.3. Here's what I've done so far: L(x,y) = f(2,5) + fx(2,5)(x) + fy(2,5)(y) L(x,y) = 6 + x - y L(2...
*September 30, 2012*

**Physics **

particle A moves along the line y = 30m with a constant velocity of magnitude 3.5 m/s and parallel to the x axis. At the instant particle A passes the y axis, particle B leaves the origin with 0 initial speed and constant acceleration of magnitude 0.50 m/s2. What angle θ ...
*September 30, 2012*

**Philosophy**

How might Hobbes argue that from the time of reformation (1517), with decline in the power of the pope, to WW1 no sufficient structure existed to support the Just War Theory?
*September 30, 2012*

**Quantum Physics**

They didn't say.. They just asked for the energy level that will emit a photon in an infrared region
*September 30, 2012*

**Quantum Physics**

An electron drop to what energy level is likely to emit a photon in the infrared region?
*September 30, 2012*

**physics**

two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
*September 29, 2012*

**physics**

two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
*September 29, 2012*

**physics**

two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
*September 29, 2012*

**understanding observation behavior**

Which of the following method depends on heavily on the observers memory.
*September 28, 2012*

**assessing development cognitive language observat**

There are several strategies that can help preschool children Foster language production one strategy that involves asking questions after a child. speaks to encourage him or her to continue talking is called?
*September 28, 2012*

**assessing development cognitive language observat**

When preschool child is first learning to print. alphabet letters he or she print letters upside down or backwards the teacher should.
*September 28, 2012*

**Physics**

A woman driving at a speed of 23 m/s sees a deer on the road ahead and applies the brakes when she is 210 m from the deer. If the deer does not move and the car stops right before it hits the deer, what is the acceleration provided by the car's brakes?
*September 26, 2012*

**math**

is 25 the answer?
*September 26, 2012*

**math**

please answer my question i really need help
*September 26, 2012*

**math**

So i should do 30/6=5 5*5=25
*September 26, 2012*

**math**

30 30 30 30 okay now what?
*September 26, 2012*

**math**

cause i need five squares to cover a aquare with a side length of 30 inches without over lappigng but i am really confused
*September 26, 2012*

**math**

i did 30 divided by 5 and i got six
*September 26, 2012*

**math**

how many squares with sides that are 6 inches long and needed to cover a aquare with a side length of 30 inches without over lappigng i put 1 am i correct?
*September 26, 2012*

**math**

no because 548 rounded to the nearest 10 is 550, this 550-130 is 420
*September 25, 2012*

**hands on variables**

n+2x10 when n=5
*September 25, 2012*

**math**

how many boxes can 372 be equally divided into?
*September 25, 2012*

**mathematics **

given that (the square root)1,225 = 35, evauluate 250(to second power)
*September 25, 2012*

**math**

um thanks
*September 25, 2012*

**math**

thank you and one more question, what is a trick i can apply when i am asked to find the cube root of something? i am taking a test on friday and i want to know so i can get a good grade on it.
*September 25, 2012*

**math**

what is the cube root of 9,261?
*September 25, 2012*

**Lang Arts**

There is not right a wrong answer but think wisley :)
*September 25, 2012*

**Lang Arts**

Yes ms.sue will help you (sorry)
*September 25, 2012*

**Lang Arts**

Context clues. Ms.sue cannot give you the answers Jamin Go back in the story and use context clues
*September 25, 2012*

**Math**

a factory has a machine which bends wire at a rate of 8 units of curvature per second. how long does it take to bend a straight wire into a circle of radius 5?
*September 24, 2012*

**math**

238x123= ?
*September 23, 2012*

**social studies**

thank you
*September 21, 2012*

**social studies **

i need 5 major events that occurred during presidency of Franklin pierce. And i need 3 major accomplishments during presidency of Franklin pierce
*September 21, 2012*

**science**

yes they do to see if their hypothesis is correct
*September 21, 2012*

**science**

scientist do experimental tests more than once
*September 21, 2012*

**math**

5t=t-7
*September 18, 2012*

**business**

In what ways do different ideologies and political systems influence the environment in which MNCs operate?
*September 9, 2012*

**Computer Science: NQC**

Write a complete NQC program that spins for 2 minutes a Lego motor connected to the RCX output port B.
*September 8, 2012*

**math**

20.007 in expanded form
*September 6, 2012*

**math**

Using the equation y=(3x+2)(x+2) determine the x intercepts, the axis of symmetry and the vertex. I changed this equation into factored form because originally it was in standard form. Im having trouble with the x-intercepts. I want to say -2, -2 but I know that can't be ...
*September 1, 2012*

**5th Grade Math**

20.007 in expanded form
*August 31, 2012*

**math**

I think i need to explain this method using SOH CAH or TOA
*August 31, 2012*

**math **

lets say you have a tree or a flagpole. Describe how you would measure this object using right angled triganometry
*August 31, 2012*

**math trig**

I think i have to use soh cah toa instead of similar triangles
*August 31, 2012*

**math trig**

lets say you have a tree or a flagpole. Describe how you would measure this object using right angled triganometry
*August 31, 2012*

**math**

round each to the place indicated
*August 28, 2012*

**social studies**

Is the former name of the Democratic Republic of the Congo Zaire?
*August 26, 2012*

**math**

name three numbers less than 20 that cannot be arranged into arrays with two rows
*August 24, 2012*

**physics **

A train is speeding along a straight, level track at +20.0 m/s when the engineer applies the brakes, which results in an acceleration of -0.894 m/s2 as long as the train is in motion. How far does the train move during the 70 sec after the brakes are first applied?
*August 24, 2012*

**Math**

In X over 8 = 2 how do i find X?
*August 22, 2012*

**vectors **

A sailboat is out on the water for a cruise. First it sails at a rate of 4.93 m/s, at an angle of 120.0° for a period of 65.0 minutes. The wind then shifts and the vessel makes progress at a rate of 2.19 m/s, at an angle of 85°, for a period of 35.0 minutes. What is ...
*August 21, 2012*

**math**

Triangle ABC is similar to triangle FGH. Angle A measures 42 degrees. Angle G measures 49 degrees. Find the measure of angle H
*August 20, 2012*

**College Chemistry**

The sun bombards the earth with about 1KJ m^-2s^-1. Calculate the maximum mass of pure ethanol that can be vaporized in 10 min from a beaker left in strong sunshine, assuming the surface area of the ethanol t be 50cm^2.
*August 15, 2012*

**math**

Express 3/8 as decimal number
*August 10, 2012*

**Physics**

I've found that: v(f)^2 = v(i)^2 -2g(y - y(i)) gives me 17.2 m/s. However, this way doesn't account for the angle, so I don't think it's the right way to solve this.
*July 28, 2012*

**Physics**

I've been using: v(f)^2 = v(i)sin(45)^2 - 2g(y-y(i)) Then I use: v = sqrt((v(f)^2 + v(i)^2) However, doing this gives me 18.6 m/s instead of 17.2 m/s. Any help would be greatly appreciated.
*July 28, 2012*

**Physics**

3. A projectile is launched at 10.0 m/s in a direction 45.0 degrees above the horizon. It hits the ground 10.0 m below its initial position. What is its speed just before hitting the ground? Ignore air resistance. The answer is supposed to be 17.2 m/s.
*July 28, 2012*

**Physics**

Three masses that are 10 kg each are located at the corners of an equilateral triangle, with side length of 0.55m. What is the magnitude of the total force acting on one mass due to the other two masses? The answer is supposed to be 3.82e-08 N. Any help is appreciated. I'm...
*July 28, 2012*

**chemistry**

Suppose you mix 50 grams of CO and 10 grams of H2. How many grams of methanol can be produced?
*July 26, 2012*

**science**

A shoe case weighing 40 lb is located on a scale inside a moving elevator that is going upward with the speed of 8 m/s. At time T1 elevator slows down with the acceleration of 3 m/s2 until the time T2. What are the the readings of the scale at T2 and T1 respectively?
*July 25, 2012*

**chemistry**

When do phase transitions occur in molecules?
*July 25, 2012*

**Physics**

I tried using a method similar to yours earlier, but I got around 70 to 80 degrees C when using it, so I tried another method. I get the same answer of 24.6C when using my method, so I'm confused as to why you don't like it. Also, when I use the specific heat of mild ...
*July 24, 2012*

**Physics**

The answer is supposed to be 27 degrees C; however, I keep getting 25 degrees C. Could someone check my method? m(w)c(w)T(iw) + m(s)c(s)T(is) = m(w)c(w)T(f) + m(s)c(s)T(f) where m(w) is the mass of the water, c(w) is the specific heat of water in cal/(g K), m(s) is the mass of...
*July 24, 2012*

**Physics**

A 2.0-kg piece of steel with a temperature of 70°C is submerged in 1.0 kg of water at 15°C. At what temperature does the water/metal system reach equilibrium? The specific heat of steel is 0.107 cal/(g × K)."
*July 24, 2012*

**Physics**

Which one of the following will form a standing wave: (1) two waves of the same amplitude and speed moving in the same direction (2) two waves of the same amplitude and speed moving in the opposite directions, (3) any two traveling waves can form standing wave if they have ...
*July 24, 2012*

**Physics**

Two cylindrical rods are made of the same material and have the same length but one is hollow and other is solid. Both are heated to same increase in temperature. Which rod expands more? From my understanding of linear thermal expansion, linear thermal expansion only depends ...
*July 23, 2012*

**cis 324**

You are an information security manager for a large retail sporting goods store. The sporting goods store is involved in the following in which they: •Maintain an internal network and an intranet protected by a firewall •Maintain a Web server in the DMZ that is ...
*July 23, 2012*

**Physics**

The table gives the specific heat of lead as 0.129 KJ/(kgK) and 0.0308 cal/(gK).
*July 19, 2012*

**Physics**

I tried using: .7E = 1/2mv^2 - cm(dT) However, I do not know the total energy of the system, so I can't finish the problem this way.
*July 19, 2012*

**Physics**

A 19-g lead bullet is shot with a speed of 340 m/s into a wooden wall. Assuming that 70% of the kinetic energy is absorbed by the bullet as heat (and 30% by the wall), what is the final temperature of the bullet? (Assume the bullet is initially at room temperature of 20°C...
*July 19, 2012*

**Physics**

I forgot that 70g was 0.07 kg. I was using 0.007 kg. Thank you. This question makes a lot more sense now.
*July 19, 2012*

**Physics**

I'm getting -25.1 g when I use this equation.
*July 19, 2012*

**Physics**

Suppose 100 g of water at 20°C is poured over a 70-g cube of ice with a temperature of -8°C. If all the ice melts, what is the final temperature of the water? If all of the ice does not melt, how much ice remains when the water–ice mixture reaches equilibrium? I&#...
*July 19, 2012*

**Physics**

The equation I found in my text book doesn't mention time being a factor when calculating R. I have R= L/k where L is length and k is thermal conductivity.
*July 19, 2012*

**Physics**

Thank you! Could you write out just the basic equation that you used?
*July 19, 2012*

**Physics**

The thermal conductivity of fiberglass batting, which is 8.9 in thick, is 8.6 10-6 BTU/(ft °F s). What is the R value (in ft2 °F h/BTU)? The R value is 24 ft^2 Fh/BTU. How do I get this answer?
*July 19, 2012*

**Physics**

A comet orbits the Sun with a period of 72.0 yr. (a) Find the semimajor axis of the orbit of the comet in astronomical units (1 AU is equal to the semimajor axis of the Earth's orbit). (b) If the comet is 0.60 AU from the Sun at perihelion, what is its maximum distance ...
*July 18, 2012*

**Calculus**

The Estradas are planning to buy a house 5 years from now. Housing experts in their area have estimated that the cost of a home will increase at a rate of 3%/year during that 5-year period. If this economic prediction holds true, how much can the Estradas expect to pay for a ...
*July 15, 2012*

**Physics**

I see where my mistake was. I multiplied in the pi when I wasn't supposed to. This question had an obvious answer.
*July 13, 2012*

**Physics**

Any help is appreciated.
*July 13, 2012*

**Physics**

A sinusoidal wave traveling on a string is moving in the positive x-direction. The wave has a wavelength of 6 m, a frequency of 48 Hz, and an amplitude of 9 cm. What is the wave function for this wave? (Use any variable or symbol stated above as necessary.) I know the answer ...
*July 13, 2012*

**Physics**

Thank you! I was able to figure out the correct answer. However, in this case shouldn't (.011^2) be (.011/2)^2?
*July 13, 2012*

**Physics**

The tension in a 2.6-m-long, 1.1-cm-diameter steel cable (ρ = 7800 kg/m3) is 860 N. What is the fundamental frequency of vibration of the cable? The answer is 6.55 Hz. I know that I'm going to use the formula: f=nsqrt(T/4L^2u) However, I'm not sure how to get the ...
*July 13, 2012*

**Physics**

Also, shouldn't f=48.9 m be f=48.9 Hz?
*July 12, 2012*

**Physics**

Thank you. I guess WebAssign made a mistake.
*July 12, 2012*

**Physics**

I'm not really sure how to figure out part (b); however, I'm sure that it's answer relies on me figure out part (a) correctly.
*July 12, 2012*

**Physics**

For part (a) I've been doing the following work: u=M/L; where u= mass per unit length u=(0.011)/(.48)= 0.022916667 v= sqrt(T/u); where T = tension v= sqrt(50.5/0.022916667) = 47.0 m/s
*July 12, 2012*

**Physics**

A 48-cm-long wire with a mass of 11.0 g is under a tension of 50.5 N. Both ends of the wire are held rigidly while it is plucked. (a) What is the speed of the waves on the wire? (b) What is the fundamental frequency of the standing wave? The answers are 50.5 m/s and 48.9 Hz ...
*July 12, 2012*

**Physics**

A string is 37.5 cm long and has a mass per unit length of 5.95 10-4 kg/m. What tension must be applied to the string so that it vibrates at the fundamental frequency of 612 Hz? The answer is supposed to be 125 N, but I'm not sure how to get this answer. So far, I have ...
*July 12, 2012*

**distance 2 cars **

if car A is going 40 mph and car B is stationary , how fast would car b have to go to cath up to car A in 4/10 of a mile
*July 11, 2012*

**Physics**

A 3-kg mass attached to a spring with k = 145 N/m is oscillating in a vat of oil, which damps the oscillations. (a) If the damping constant of the oil is b = 14 kg/s, how long will it take the amplitude of the oscillations to decrease to 1% of its original value? (b) What ...
*July 9, 2012*

**Stats**

In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how well their child performs different tasks. One item was "Has difficulty organizing work," rated on a five-point scale of 0 to 4 with 0 ...
*July 9, 2012*

**Stats**

Thank you!
*July 9, 2012*

**Stats**

You want to rent an unfurnished one-bedroom apartment in Boston next year. The mean monthly rent for a random sample of 14 apartments advertised in the local newspaper is $1200. Assume that the standard deviation is $230. Find a 95% confidence interval for the mean monthly ...
*July 9, 2012*

**Probability & Statistics**

You want to rent an unfurnished one-bedroom apartment in Boston next year. The mean monthly rent for a random sample of 14 apartments advertised in the local newspaper is $1200. Assume that the standard deviation is $230. Find a 95% confidence interval for the mean monthly ...
*July 9, 2012*

**Physics**

One of the related questions helped me. Thank you Jiskha!
*July 7, 2012*

**Physics**

When a mass is attached to a vertical spring, the spring is stretched a distance d. The mass is then pulled down from this position and released. It undergoes 53 oscillations in 30.6 s. What was the distance d? The answer is supposed to be 8.28 cm. How can I get this answer? ...
*July 7, 2012*