Posts by james

Total # Posts: 2,499

Trigonometry
I need help on both of these... Find the exact value of cotx if the terminal side of angle x contains the point (-5,-12). Find the exact value of secx for angle x that has a terminal side containing the point (-1,squareroot3)

Trigonometry
Express 3 rad in degree measure and approximate to four significant digits

physics
A ball is thrown straight up with an initial speed of 30 m/s. How high does it go? Assume the acceleration of gravity is 10 m/s 2 . Answer in units of m

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

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

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...

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 ...

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?

Algebra
(a,9)(b,10)(c,11)

Quantum Physics
They didn't say.. They just asked for the energy level that will emit a photon in an infrared region

Quantum Physics
An electron drop to what energy level is likely to emit a photon in the infrared region?

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?

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?

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?

understanding observation behavior
Which of the following method depends on heavily on the observers memory.

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?

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.

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?

math

math

math
So i should do 30/6=5 5*5=25

math
30 30 30 30 okay now what?

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

math
i did 30 divided by 5 and i got six

math
2?

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?

math
no because 548 rounded to the nearest 10 is 550, this 550-130 is 420

hands on variables
n+2x10 when n=5

math
how many boxes can 372 be equally divided into?

mathematics
given that (the square root)1,225 = 35, evauluate 250(to second power)

math
um thanks

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.

math
what is the cube root of 9,261?

Lang Arts
There is not right a wrong answer but think wisley :)

Lang Arts

Lang Arts
Context clues. Ms.sue cannot give you the answers Jamin Go back in the story and use context clues

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?

math
238x123= ?

social studies
thank you

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

science
yes they do to see if their hypothesis is correct

science
scientist do experimental tests more than once

Physics
A) m=2.85 kg, F=?, a=9.8 m/s^2 due to gravity. F=m*a F=2.85*9.8=27.9 N B) Pulling up creates a force against the forces working so.. n-15N. 27.9N-15N=12.9N C)Pushing up creates a force with the forces already working so.. n+15N 27.9N+15N=42.9N

math
5t=t-7

In what ways do different ideologies and political systems influence the environment in which MNCs operate?

Computer Science: NQC
Write a complete NQC program that spins for 2 minutes a Lego motor connected to the RCX output port B.

math
20.007 in expanded form

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 ...

20.007 in expanded form

math
I think i need to explain this method using SOH CAH or TOA

math
lets say you have a tree or a flagpole. Describe how you would measure this object using right angled triganometry

math trig
I think i have to use soh cah toa instead of similar triangles

math trig
lets say you have a tree or a flagpole. Describe how you would measure this object using right angled triganometry

math
round each to the place indicated

social studies
Is the former name of the Democratic Republic of the Congo Zaire?

math
name three numbers less than 20 that cannot be arranged into arrays with two rows

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?

Math
In X over 8 = 2 how do i find X?

HEALTH

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 ...

math
Triangle ABC is similar to triangle FGH. Angle A measures 42 degrees. Angle G measures 49 degrees. Find the measure of angle H

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.

health
Me too lol. So many jmhs kids.

math
Express 3/8 as decimal number

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.

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.

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.

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...

chemistry
Suppose you mix 50 grams of CO and 10 grams of H2. How many grams of methanol can be produced?

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?

chemistry
When do phase transitions occur in molecules?

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 ...

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...

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)."

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 ...

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 ...

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 ...

Physics
The table gives the specific heat of lead as 0.129 KJ/(kgK) and 0.0308 cal/(gK).

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.

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...

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.

Physics
I'm getting -25.1 g when I use this equation.

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&#...

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.

Physics
Thank you! Could you write out just the basic equation that you used?

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?

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 ...

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 ...

Physics
I see where my mistake was. I multiplied in the pi when I wasn't supposed to. This question had an obvious answer.

Physics
Any help is appreciated.

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 ...

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

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 ...

Physics
Also, shouldn't f=48.9 m be f=48.9 Hz?

Physics
Thank you. I guess WebAssign made a mistake.

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.

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

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 ...

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 ...

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