Thursday
October 23, 2014

Posts by James


Total # Posts: 1,850

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
2?
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

physics
Suppose a cars brakes can produce an acceleration of -7m/s^2. If the car is traveling at an initial speed of 28m/s, what is the minimum distance necessary to stop the car?
July 7, 2012

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