Thursday

May 28, 2015

May 28, 2015

Total # Posts: 2,364

**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*

**Math **

Would it be plausible for Car B to catch Car A within .5 mile?
*October 6, 2011*

**Math **

Car A is travelling at a constant speed of 100mph at the time it passes a stationary vehicle (Car B). If the Car B hopes to catch Car A within a mile, how fast must Car B travel? Assume Car B can accelerate from 0-60mph in 6 seconds.
*October 6, 2011*

**Chemistry**

What are the molecular and net ionic equations for potassium chloride + ammonium phosphate
*October 4, 2011*

**Chemistry**

How many number of ions of each type are present in the following aqueous solution? 113 mL of .490 M aluminum chloride.
*October 4, 2011*

**Math**

12r-4r=48 What is r?
*October 4, 2011*

**math**

construct-angle-f-so-that-m-angle-f-equals-2-m-angle-c
*October 3, 2011*

**budgeting**

Whats the answer please.
*October 3, 2011*

**physical geology**

Select a city or region that is faced with one of the following issues: o Saltwater invasion in coastal wells o Depletion of an aquifer for drinking or agricultural water o Subsidence associated with water pumping o Depletion or pollution of surface water from human use o ...
*October 2, 2011*

**MATH-**

A ROCK IS DROPPED INTO A DRY WELL. THE TOTAL TIME TO REACH THE BOTTOM NAD FOR THE SOUND TO TRAVEL BACK TO THE TOP IS 6.7 S. WHAT IS THE DEPTH OF THE WELL TO THE NEAREST FOOT.
*September 29, 2011*

**physics**

Two cars are initially moving at constant speeds of 50 m/s (first car) and 30 m/s (second car) along a straight track with the first car being behind. At a certain point (e.g. point A) on the track the first car overtakes the other one. At this very moment of time the first ...
*September 29, 2011*

**Physics**

Two students are on a balcony 24.9 m above the street. One student throws a ball, b1, vertically downward at 19.6 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) ...
*September 29, 2011*

**earth**

Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 11 Earth radii from Earth's center?
*September 29, 2011*

**ivcc**

What is the magnitude of the apparent weight of a 76 astronaut 3200 from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.6 ?
*September 28, 2011*

**Chemistry**

How many moles of Io3 are present in a 100mL solution containing 1.390g of KIO3
*September 28, 2011*

**Science**

How many moles of Io3 are present in a 100mL solution containing 1.390g of KIO3
*September 28, 2011*

**chemistry**

What is the mass of 1.2 grams of oxygen if it occupies a volume of 500 cubic centimeters at s.t.p?
*September 27, 2011*

**algebra**

Explain how to find the sum using game chips, then give the answer 8+-10
*September 26, 2011*

**sociality**

what are the dimentions of cultural diversity?
*September 25, 2011*

**science**

Pure gold has a density of 19.32 g/cm3. How large would a piece of gold be if it had a mass of 483 g?
*September 21, 2011*

**algebra**

= 25/12 x (-7) = -175/12 = -14.583333
*September 21, 2011*

**physics**

a uniform ladder 16 m long weighing 80 N leans against a smooth vertical wall, making 30 degree with the wall. Find the thrust of the wall, and the force of the point on the ground.
*September 21, 2011*

**statistics**

The scores on the final exam in a course have approximately a bell-shaped distribution. The mean score was 72, the highest score was 99, and the lowest score was 41. Use the value of the range (58) to estimate the value of the standard deviation. (Round your answer to the ...
*September 21, 2011*

**geometry**

there for B and C is 18
*September 21, 2011*

**geometry**

i think you have your nummbers mixed up for its not posible to have A and C shorter then A and B since A and B are part of the line
*September 21, 2011*

**physics**

1. A ball rolling on a platform at 4 m/s rolls off of the platform at 4 m/s and hits the ground 8 m from the base of the platform. a. How long does it take the ball to hit the ground? b. How high is the platform?
*September 21, 2011*

**physics **

a car traveling 7.0 m/s accelerates uniformly at 2.5 m/s squared to reach a speed of 12 m/s. how long does it take for the acceleration to occur?
*September 20, 2011*

**finance**

You borrow $185,000 to buy a house. The mortgage rate is 6.5 percent and the loan period is 32 years. Payments are made monthly. If you pay the mortgage according to the loan agreement, how much total interest will you pay?
*September 20, 2011*

**MATH**

Triangle T has vertices A(-9, 10)B(1,0)and C(5,4). Points A, B, and P(also on th xy plane) form a triangle that is congruent to triangle T. Find all the possible coordinates for P.
*September 15, 2011*

**Ottawa University **

Triangle T has vertices A(-9, 10)B(1,0)and C(5,4). Points A, B, and P(also on th xy plane) form a triangle that is congruent to triangle T. Find all the possible coordinates for P.
*September 15, 2011*

**Physics for Engineers**

For c.) Set the y component to 5.2m 5.2= 18.13sin53(t)-4.9(t)^2 solve the quadratic for t and plug into d=18.13cos53(t) This will give you the horizontal distance until the ball lands on the roof.
*September 14, 2011*

**Physics for Engineers**

For b.) You got the y component correct however you multiplied it by sin53 a second time. The correct equation should be y=18.13sin53(2.2)-4.9(4.8) or with the y component solved for already, y=14.48(2.2)-4.9(4.8) The ball is at height= 8.336m It clears the wall by 8.336-6.7=1...
*September 14, 2011*

**brain teaser**

Bono (1) walks over with Edge (2), 2 minutes, Bono walks back, 1 minute (3 total), Larry (10) and Adam (5), walk across, 10 minutes (13 total), Edge Walks Back, 2 minutes (15 total), Edge and Bono walk back, 2 minutes (17 total)
*September 14, 2011*

**science**

How do you calculate the gravity of an object? equation needed h=1/2 gt^2 Solve the equation for g; g=2h/t^2 Set height is 2 foot, dropped small object from 2ft, timed at 0.3 seconds. Calculate the gravity of the object. Is this right? 2=1/2*9.8 t^2 t^2=2*2/9.8=0.40 t=0.40^ ...
*September 12, 2011*

**science**

Simpson drives his car with an average velocity of 48.0 km/h to the east. How long will it take him to drive 144 km on a straight highway?
*September 11, 2011*

**science**

It take you 9.5 min to walk with an average velocity of 1.2 m/s to the north from the bus stop to the museum entrance. What is your displacewment?
*September 11, 2011*

**scientist**

Which of the following BEST describes the theory of natural selection?
*September 11, 2011*

**Math**

How many two block towers can you make from: 1 black block,1 red block, and 1 blue block? Please explain.
*September 8, 2011*

**Math**

I have a shirt, a skirt, a blouse and a pant. How many different outfits can I make?
*September 8, 2011*

**math**

a(1,7),b(-3,1) coordinates of missing endpoint if b is the midpoint of ac
*September 8, 2011*

**5th grade math**

.4 equals how many hundreths? .07 equals how may thousandths? Do you just multiply the .4 by 100 and do you just multiply the .07 by 1000?
*September 7, 2011*

**Science**

Two tugboats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90°. What net force is exerted on the ship?
*September 3, 2011*

**Physics**

A child bounces a 55 g superball on the side- walk. The velocity change of the superball is from 22 m/s downward to 14 m/s upward. If the contact time with the sidewalk is 1 800 s, what is the magnitude of the average force exerted on the superball by the sidewalk? Answer in ...
*August 30, 2011*

**statistics**

You have been approached by the editor of gentlemen's magazine to carry ot a research study. The magazine has been unsuccessful in atracting shoe manufacturers as advertisers. When the sales force tried to secure advertising from shoe manufacurers, they were told men's...
*August 26, 2011*

**trig**

A ferris wheel with a diameter of 100 feet rotates at a constant rate of 4 revolutions per minute. Let the center of the ferris wheel be at the origin. 1. Each of the ferris wheel's cars travels around a cirlce. a) Write an equation of the circle where x and y are measured...
*August 20, 2011*

**Algebra**

T=6+20/n+2. Solve please
*August 11, 2011*