Friday

October 24, 2014

October 24, 2014

Total # Posts: 2,211

**physics**

An airplane is flying horizontally at 115 m/s, at a 20.5 degree angle north of east. State its velocity in rectangular coordinates. Assume that north and east are in the positive direction.
*January 23, 2012*

**Trigonometry**

In a right triangle, CT = 6, CA = 3, and m<CAT = 90. What is the value of cot C ? CT= hypo CA= Opp.
*January 18, 2012*

**Physics**

A small ball is launched at an angle of 30.0 degrees about the horizontal. It reaches a maximum height of 2.5m with a respect to the launch position. What is the initial velocity of the ball when its launched? What is the range, defined as a horizontal distance traveled until ...
*January 18, 2012*

**COM 1001**

Wait it is any form of communication that is not face to face
*January 16, 2012*

**COM 1001**

I have no idea that is what has me super stumped I have read the two chapters over and over again
*January 16, 2012*

**COM 1001**

How do the components and processes of communication apply to the electrnic/computer channel?
*January 16, 2012*

**math**

From the Periodic Table, 1 mole of aluminum weighs 27.0 g., Therefore; If 54.0 g of aluminum are placed into the beaker to react with copper(II) chloride, how many grams of the metal product will be produced?
*January 12, 2012*

**Science**

A glass window 0.50 cm thick measures 86 cm by 31 . How much heat flows through this window per minute if the inside and outside temperatures differ by 17 ? Express your answer using two significant figures. Q/t=_________kJ/min
*January 9, 2012*

**MATH**

For which value of x will the fraction 7/2x-6 be undefined? HOW TO DO THIS ?
*December 30, 2011*

**MATH**

for which value of X will the fraction 7/2x-6 be undefined ? and check this IF three times a number decreased by 5, the result is 7. find the number. 3x-5=7 and x=4 is this right?
*December 25, 2011*

**Finance**

The answer is $1,086,250
*December 16, 2011*

**calculus**

Yes, I know, but I i had question about the answer... I'm math stupid :)
*December 16, 2011*

**calculus**

Damon help again :) (last one I promise) why is X along the road sqrt2/2? ] A rancher plans to set aside a rectangular region of one square kilometer for cattle and wishes to build a wooden fence to enclose the region. Since one side of the region will run along the road, the ...
*December 16, 2011*

**Calculus**

Damon, Help :) A rancher plans to set aside a rectangular region of one square kilometer for cattle and wishes to build a wooden fence to enclose the region. Since one side of the region will run along the road, the rancher decides to use a better quality wood for that side ...
*December 16, 2011*

**Calculus**

A rancher plans to set aside a rectangular region of one square kilometer for cattle and wishes to build a wooden fence to enclose the region. Since one side of the region will run along the road, the rancher decides to use a better quality wood for that side which costs three...
*December 16, 2011*

**Physics**

false, its called the coriolis effect
*December 13, 2011*

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.86 m. The stones are thrown with the same speed of 9.78 m/s. Find the location (above the base of the ...
*December 13, 2011*

**physics**

The velocity of a diver just before hitting the water is -11.1 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 1.18 s of the dive?
*December 13, 2011*

**physics**

A drag racer, starting from rest, speeds up for 384 m with an acceleration of +19.3 m/s2. A parachute then opens, slowing the car down with an acceleration of -6.33 m/s2. How fast is the racer moving 302 m after the parachute opens?
*December 13, 2011*

**history**

Thank you .
*December 12, 2011*

**Law**

Yes it is C. Read the Land Pollution Section at: "classweb.gmu.edu/rcoffinb/Chapter%2017%20Outline.htm"
*December 10, 2011*

**algebra**

9z^2+24z+16/6z^2+5z-4
*December 9, 2011*

**physical science**

One of Saturn's moons has an orbital distance of 1.87 x 108 m. The mean orbital period of this moon is approximately 23 hours. Use this information to estimate a mass for the planet Saturn.
*December 8, 2011*

**science**

What is the ratio of the large cell volume is 64mm3 and surface is 96mm2
*December 5, 2011*

**science-biology**

biology-forums(dot)com/index.php/topic,10448.new.html#new
*December 4, 2011*

**calculus**

Correction its not 2. It's 1/72 ft lbs
*December 1, 2011*

**calculus**

The answer is 2 a = 0 (start of the spring) b = 1 integrate 4x then plug in the limits (0 and 1)
*December 1, 2011*

**calculus**

The height (in feet) attained by a rocket t seconds into flight is giving by the function h(t)= -1/3t^3 + 16t^2 + 33t + 10 When is the rocket rising? When is the rocket decreasing? when does it reach its maximum height above the ground? what is the maximum height? what is the ...
*November 30, 2011*

**calc 2**

The height (in feet) attained by a rocket t seconds into flight is giving by the function h(t)= -1/3t^3 + 16t^2 + 33t + 10 When is the rocket rising? When is the rocket decreasing? when does it reach its maximum height above the ground? what is the maximum height? what is the ...
*November 30, 2011*

**calc**

a stone is thrown striaght up from the roof of an 80 foot building. the height of the stone above the ground t seconds later is giving by the function h(t)=-16t^2 + 64t +80 during what time is the stone rising? when is the stone falling? what is the maximum upward velocity? ...
*November 30, 2011*

**chemistry**

Volume of 0.185 mol . L-1 and 0.74 M
*November 28, 2011*

**chemistry**

Air dry weight of MgNH4Po4 * 6 H2O
*November 27, 2011*

**English**

Ms. Sue, thanks for your answer. Is there a rule in grammar that I can use to convince someone that #2 is correct? Which one is correct: 1. The box contains two slides labeled "A" or "B". 2. The box contains two slides labeled "A" and "B".
*November 22, 2011*

**english**

Ms. Sue, is there a rule for this that I can use to justify your answer. I have a hard time convincing a colleague that you are correct.
*November 22, 2011*

**english**

which one is correct: 1. the box contains two slides labeled "A" or "B" 2. the box contains two slides labeled "A" and "B"
*November 22, 2011*

**physics**

A 450 kg spherical mass is placed 4.40 meters away from a 550 kg spherical mass. What is the magnitude of the gravitational field midway between the two? ...... Im not quite sure how to do this any help would be appreciated.
*November 20, 2011*

**Chemistry**

An oil whose density is 0.775g/mL was used in a open-end manometer to measure the pressure of a gas in a flask, as shown in figure (b). If the height of the oil column is 7.68cm and Pbar = 760.0mmHg. What is the pressure of the gas in the flask in mmHg?
*November 18, 2011*

**Science**

what is a dilute solution
*November 14, 2011*

**English**

Soldiers carried several days cold nations. should days chage to a possessive noun from days to days'
*November 10, 2011*

**Algebra**

Solve and simplify: x^2+14x-4=0
*November 9, 2011*

**Algebra**

Add, simplify if possible 4y/y^2-9 + y/y-3
*November 9, 2011*

**Algebra**

Solve sqrt:9x+55=x+5, Simplify and use comma to separate the answers
*November 9, 2011*

**Chemistry**

I have a compound (mx) weak acid (x- = Hx) mx in 5M strong acid solution solubility = 5x10(-3) Ksp = 1x10(-20) Find Ka... I need to know where to start
*November 8, 2011*

**Math**

Classify triangle ABC by its sides if side AB = 6x, side AC = 4x + 6 and side BC = 8x + 3. The perimeter of triangle ABC is 63. Show all your work. Explain your reasoning.
*November 8, 2011*

**geometry**

A wire 10 meters ong is to be cut into two pieces. One piece wil be shaped as a square, and the other piece will be shaped as a circle. (piece one is 4x, piece two is 10-4x) a)Express the total area A enclosed by the pieces of wire as a function of the length x of the side of...
*November 7, 2011*

**fraction 10-1 math **

3/7 are red
*November 7, 2011*

**Physics**

Michelson used a rotating eight sided mirrored "wheel" to determine speed of light. In this case the mirror is rotated at a certain frequency which allows light to travel from the source, reflect off the mirrored wheel and into the observers eyes. What is the minimum...
*November 7, 2011*

**Social studies**

What stands on a hill called acropolis in for 2500 years in Greece
*November 5, 2011*

**geometry**

In ∆RST, RS = 10, RT = 15, and m∠R = 32. In ∆UVW, UV = 12, UW = 18, and m∠U = 32. Which of the following statements is correct? 1. ∆RST ∼ ∆WUV and the similarity ratio is 56. 2. ∆RST ∼ ∆UVW and the similarity ratio is...
*November 3, 2011*

**Physics**

Find the linear speed of the bottom of a test tube in a centrifuge if the centripetal acceleration there is 5.1×104 times the acceleration of gravity. The distance from the axis of rotation to the bottom of the test tube is 7.7 .
*November 3, 2011*

**Physics**

Jill of the Jungle swings on a vine 6.4 long. What is the tension in the vine if Jill, whose mass is 59 , is moving at 3.0 when the vine is vertical?
*November 3, 2011*

**Physics**

Find the centripetal acceleration at the top of a test tube in a centrifuge, given that the top is 4.5 from the axis of rotation and that its linear speed is 76 .
*November 3, 2011*

**Physics**

Driving in your car with a constant speed of 12 , you encounter a bump in the road that has a circular cross-section, as indicated in the figure . If the radius of curvature of the bump is 35 , find the apparent weight of a 70- person in your car as you pass over the top of ...
*November 3, 2011*

**Physics**

When you take your 1000- car out for a spin, you go around a corner of radius 57 with a speed of 19 . The coefficient of static friction between the car and the road is 0.88. Assuming your car doesn't skid, what is the force exerted on it by static friction?
*November 3, 2011*

**Physics**

A 8.0×10−2- toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 in a horizontal circle of radius 0.49 , as illustrated in the figure . Find the angle the string makes with the vertical...
*November 3, 2011*

**Physics**

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?
*November 3, 2011*

**Physics**

A 6.5- bowling ball and a 7.1- bowling ball rest on a rack 0.80 apart. Part A- What is the force of gravity exerted on each of the balls by the other ball? Part B- At what separation is the force of gravity between the balls equal to 2.2×10−9 ?
*November 3, 2011*

**Physics**

A communications satellite with a mass of 400 is in a circular orbit about the Earth. The radius of the orbit is 3.7×104 as measured from the center of the Earth. Calculate the gravitational force exerted on the satellite by the Earth when it is in orbit.
*November 3, 2011*

**History**

What language was spoken/written by the venerable bede/ pre Beowulf period?
*November 2, 2011*

**art**

ddddddddddsssssssssssssfffffffffffff
*November 1, 2011*

**ecology**

what is the single most important determination of plant distribution?
*November 1, 2011*

**Math**

(-4,8);6x=7y+3 Write the equation of the line containing the given points and parallel to given line express your answer in y=mx+b form
*October 30, 2011*

**Engineering**

-From the following two linear homogeneous algebraic equations:(sqr= square root) (1) B*sin(kl/sqr2) = D*sin(kl) (2) (k/sqr2)*B*cos(kl/sqr2) = (k)*D*cos(kl) -Form matrix of these 2 equations and solving the determinant=0 will lead to: (1/sqr2)*cos(kl/sqr2)*sin(kl) - sin(kl/...
*October 30, 2011*

**English**

Thanks Ms. Sue
*October 27, 2011*

**English**

Write two examples of complex sentences, the first having the dependent clause appearring at the start, and the second with the independent clause appearing first. Write the sentences so they talk about having tacos for lunch.
*October 27, 2011*

**Physical Science**

What becomes of the electric energy provided in electrolysis? In what device is this energy transformation reversed?
*October 26, 2011*

**physics**

A 1.20- block of wood sits at the edge of a table, 0.720 above the floor. A 1.20×10−2- bullet moving horizontally with a speed of 750 embeds itself within the block. What horizontal distance does the block cover before hitting the ground?
*October 26, 2011*

**physics**

A 1.20- block of wood sits at the edge of a table, 0.720 above the floor. A 1.20×10−2- bullet moving horizontally with a speed of 750 embeds itself within the block. What horizontal distance does the block cover before hitting the ground?
*October 26, 2011*

**physic**

A 1.20-{\rm kg} block of wood sits at the edge of a table, 0.720 m above the floor. A 1.20×10−2-{\rm kg} bullet moving horizontally with a speed of 750 m/s embeds itself within the block
*October 26, 2011*

**Math**

Which has the largest perimeter, Polygon A or Polygon B? Polygon A is a square (5 cm each side) - Polygon B is 20 sided (1 cm each side).
*October 25, 2011*

**Physics**

A block is pushed across a horizontal surface with a coefficient of kinetic friction of 0.15 by applying a 150 N horizontal force. If the block accelerates at the rate of 2.53 m/s2 (squared), what is the mass of the block?
*October 24, 2011*

**calculus**

a ball is thrown upward at 96 feet per second from the top of a 100 foot building. 1.when will the ball obtain maximum height 2. when will the ball hit the ground?
*October 24, 2011*

**physics**

thats 23 degrees
*October 24, 2011*

**physics**

At the base of a frictionless icy hill that rises at 23.0m above the horizontal, a toboggan has a speed of 12.0m/s toward the hill. How high vertically above the base will it go before stopping?
*October 24, 2011*

**algebra**

N(x)= -0.4x^2 + 11.2x +10 solve for x
*October 23, 2011*

**Chemistry**

If 0.120 moles of water are produced in the reaction H+(aq)+OH-(aq)=H2O deltaH=-56.2kj/mol
*October 23, 2011*

**Chemistry**

If 0.120 moles of water are produced in the reaction H+(aq)+OH-(aq)=H2O deltaH=-56.2kj/mol
*October 23, 2011*

**Chemistry**

Delta H reaction for the following reaction: C(s)+H2O(g)=>CO(g)+H2(g)
*October 23, 2011*

**algebra**

Can anyone solve A= 1/2h(a+b) solve for h
*October 23, 2011*

**Math**

A tile is 38 cm long and the space between the tiles is 0.8. How many tiles are required to build a floor 5.82 m long?
*October 19, 2011*

**Math**

A tile is 38 cm long and the space between the tiles is 0.8. How many tiles are required to build a floor 5.82 m long?
*October 19, 2011*

**physics**

Imgaine that a cart intially moving with velocity V_0, collides with a cart at rest and then the two carts stick together. Find a equation for potential energy in this case.
*October 17, 2011*

**chemistry**

What mass of oxygen is needed for the complete combustion of 2.60×10−3 of methane? Express your answer with the appropriate units.
*October 14, 2011*

**CHEMISTRY**

What mass of water is produced from the complete combustion of 2.60×10−3 of methane? Express your answer with the appropriate units.
*October 13, 2011*

**chemistry**

What mass of carbon dioxide is produced from the complete combustion of 2.60×10−3 of methane?
*October 13, 2011*

**social s.**

another word for trail of tears
*October 13, 2011*

**CHEMISTRY**

What coefficients are needed to balance the equation for the complete combustion of methane? Enter the coefficients in the order CH4,O2,CO2, and H2O,respectively. Express your answer as four integers, separated by commas (e.g., 1,2,3,4).
*October 13, 2011*

**chemistry**

For a week acid whose ionization constant is 1.75 x 10(-5), the pH of its solution is 3.0. Determine its degree of ionization and its percent ionization.
*October 13, 2011*

**chemistry**

Write an equation for the hydrolysis of each of the following salt: i) NaCH2H3O2; ii) Na2CO3; iii) NH4Br
*October 13, 2011*

**chemistry**

Determine the mass of KHP (molar mas = 204.2 g/mol) that is required to react with 30.0 mL of 1.0 M Na0H (molar mass 40.0 g/mol)if the reaction is NaOH + KHP --> NaKP + H2O
*October 13, 2011*

**chemistry**

Account for the increase in reaction rate brought about by a catalyst.
*October 13, 2011*

**chemistry**

Explain the difference between the rate of a reaction and its rate constant.
*October 13, 2011*

**geometry**

M is the midpoint of AB. AM=5x and MB=3x+4. find x.
*October 12, 2011*

**Chemistry**

a titration experiment 20 mL solution of hydrochloric acid required 15.2mL of a .879 M barium hydroxide solution. What was the molar concentration of the HCl solution?
*October 11, 2011*

**chemistry**

The energy levels the electron can occupy in the H atom can be calculated using the energy level equation. Calculate the wavelength (nm) of the photon absorbed when the electron goes from a n= 1 energy level to a n= 3 energy level. Express answer in scientific notation. ...
*October 11, 2011*

**Calculus**

Find the indicated limits. If the limit does not exist, so state, or use the symbol + ∞ or - ∞. f(x) = { 2 - x if x ≤ 3 { -1 + 3x - x^2 if x > 3 a) lim 3+ f(x) x->3 b) lim 3- f(x) x->3 c) lim f(x) x->3 d) lim ∞ f(x) x->3 e) lim -∞ f...
*October 9, 2011*

**algebra**

Simplify each expression. Justify your steps using the Commutative, Associative and Distributive Properties when necessary 8k2 + 4k - 3k2 + 3^2 - k + 5 Please let me
*October 8, 2011*

**algebra**

write an expression that has five terms and simplifies to 5m3 + 4n. Please give me the steps
*October 8, 2011*

**Calculus**

f a rock is thrown upward on the planet Mars with a velocity of 7 m/s, its height in meters t seconds later is given by y = 7t − 1.86t^2. (Round your answers to two decimal places.) Estimate the instantaneous velocity when t = 1.
*October 8, 2011*

**geometry**

Triangle XYZ above is similar to triangle UVW (not shown). If the length of one side of triangle UVW is 60, then what is one possible perimeter of triangle UVW
*October 7, 2011*

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