Tuesday
July 29, 2014

Posts by Hal


Total # Posts: 31

Math Help
The length of Joe's rectangular garden is 1 meter less than twice its width, and its area is 120m^2. Find the dimensions of the garden by setting up a quadratic equation and define its variables.

physics
A 45 kg boy is holding a 12 kg pumpkin while standing on ice skates on a smooth frozen pond. The boy tosses the pumpkin with a horizontal speed of 2.8 m/s towards a 37 kg girl who catches it. The girl is also wearing ice skates. What are the final speeds of the boy and the girl?

algebra
Could you show me how to do these math systems and show your work so i understand how to do them. 1) 3x+2y+4z=19 2x-y+z=3 6x+7y-z=17 2) 5x+8y+6z=14 2x+5y+z=12 -3x+6y-12z=20 3) x^2+2xy-2y^2=-11 x^2+xy-2y^2=-9

Quantum Physics
In Problems 1 to 5 we will work through example of QFTM for M = 6. Problem 1: What is w? You can use e, pi, and M in your response. Please do not subtitute 6 for M. Specify the probability amplitudes. You should use w to denote w, but please fully simplify your answer such tha...

physic
a) impulse = Force * time of interaction i = 950N *.0044s = 4.18N-s don't know how to do B

Algebra 2
THANK YOU SO MUCH! :D

Algebra 2
The problem is 3x^2 - 26 + 35 (We have to factor it!) So, I did the problem, but I'm not sure how to write the final answer. This is what my problem looks like so far: 3x^2 - 26 + 35 (3x^2-21x)-(5x+35) 3x(x-7)-5(x+7) and this is where I have the problem. I know I need to p...

physics
A sports car moving at constant speed travels 120 m in 5.1 s. If it then brakes and comes to a stop in 4.0 s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be the direction of travel.)

chemistry
Calculate the equilibrium constant at 25 C for CH4 + 2 H2O --> CO2 + 4H2 given: delta G for CH4 = -50.81 H2O = -228.6 CO2 = -394.4 H2 = 0

chemistry
Re-post ? [H3O+] in 0.15 M C2N2H8 and 0.35 M C2H2H9Cl; Kb= 4.7 x 10^-4

chemistry
? [H3O+] in 0.15 M C2H2H8 and 0.35 M C2H2H9Cl

chemistry
I. balanced equation: Ca(HCO3)2 + HCl ->CaCl2 + 2 H2O + 2 CO2 II. find moles of Ca(HCO3)2 : 40.3 mL x 1 L/1000mL x 0.2 mole/L = 8.06 x 10^-3 moles Ca(HCO3)2 III. find moles CO2 : [8.06 x 10^-3] moles Ca(HCO3)2 x 2 moles CO2/1 mole Ca(HCO3)2 = 1.61 x 10^-2 moles CO2 IV. find...

Chemistry
How much sodium carbonate is needed to precipitate nickel sulfate

Chemistry
How much sulfuric acid is neede to dissole 200 pounds of nickel powder

Social Studies
Where was the first civilization? What was the region called then and now?

calculus
Consider line segments which are tangent to a point on the right half (x>0) of the curve y = x^2 + 1 and connect the tangent point to the x-axis. If the tangent point is close to the y-axis, the line segment is long. If the tangent point is far from the y-axis, the line seg...

calculus
And isn't (c^4-2c^2+1)/(4c^2) supposed to be (c^4+2c^2+1)/(4c^2)?

calculus
Can you explain to me how you found out the distance formula. Because how did you find out D^2 = c^4 + 2c^2 + 1 + c^2 - c^2 + 1 + (c^4-2c^2+1)/(4c^2)? I understand the first part with c^4 + 2c^2 + 1, but I don't understand how you got the second part.

calculus
Thanks so much, but then do you plug in c back into the first point and tangent line and x-intercept to get the x and y coordinates and tangent line equation and x-intercept, respectively?

calculus
Consider line segments which are tangent to a point on the right half (x>0) of the curve y = x^2 + 1 and connect the tangent point to the x-axis. If the tangent point is close to the y-axis, the line segment is long. If the tangent point is far from the y-axis, the line seg...

english
explain which groups of people make up the "britons" and anglo-saxon culture in beowulf

Pre-Cal
Wouldn't it be: x^2/4 - (y-1)^2/(9/5)=1 because that's what you get plug b^2 back into the original equation?

Pre-Cal
(-2,1) and (2,1) are the vertices.

Pre-Cal
(-2,1) and (2,1) Passes through (5,4) What is the standard form of the equation of the hyperbola?

7th grade
Can someone help me unscramble this Spanish word: sssatlfrieeu'

Geometry
What is the surface area of a right prism that has these dimensions? Base- 11" x 15 " Back- 10" x 15" Front-?

Dynamics
Err, I typed that wrong. The acceleration is in fact constant. The velocity on the other hand is increasing at a constant rate so at some point the velocity will be greater than the friction force can hold. I just can't put it all together.

Dynamics
The acceleration increases at a constant rate, it does not remain constant. Thanks for replying, though. I'm still having trouble with it.

Dynamics
I should add, the answer is given as 11.32s, I just don't know how to get there. Thanks again.

Dynamics
A series of small packages are being moved by a thin conveyor belt that passes over a 300-mm radius idler pulley. The belt starts from rest at time t=0 and its speed increases at a constant rate of 150mm/s^2. Knowing that the coefficient of static friction between the pacakges...

chemistry
What will be the final temperature of the water in an insulated container as the result of passing 5.00 g of steam [H2O(g)] at 100.0°C into 195.0 g of water at 20.0°C? (?H°vap = 40.6 kJ/mol H2O) The best way to do these problems is to make the heat gained + heat lo...

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