Questions Asked on
August 9, 2012

physics 102
The output voltage of an AC generator is given by Δv = (180 V) sin (70πt). The generator is connected across a 13.0Ω resistor. (a) By inspection, what is the maximum voltage? V (b) By inspection, what is the frequency? Hz (c) Find the rms voltage
asked by Matt Will 
biology
1.What is the % concentration of oil in the first, second, and third trophic levels in our food chain? 2.How did the concentration of oil change from one trophic level to the next? 3.How does the change in concentration represent biomagnification? 4.How
asked by kiesha 
math
The stiffness S of a rectangular beam is proportional to its width (w) times the cube of its depth/height (h). find the dimensions (i.e.: w and h) of stiffest beam that can be cut from a log which has a circular crosssection with diameter of 12in.
asked by deel 
physics
Find the Magnitude of the force exerted by each cable to support the 625 N punching bag. One cable is connected to the ceiling with an angle of 37 degrees and the other cable is connected perpendicular to the side wall (Horizontal). HELPP
asked by kacey 
Chemistry
500ml of 0.250M Na2SO4 solution is added to an aqueous solution of 15.00 g of BaCl2 resulting in the formation of white precipitate of BaSO4. How many moles and how many grams of BaSO4 are formed?
asked by Natasha 
physics
A copper block is removed from a 310 C oven and dropped into 1.10 kg of water at 20.2 C. The water quickly reaches 25.4 C and then remains at that temperature.what is the mass of the block?
asked by Anonymous 
physics
two objects are thrown from the top edge of a cliff with a speed of 10 m/s. one object is thrown straight down and the other straight up. if the first object hits the ground in 4.0 second, the second hits the ground in ________ seconds after the first
asked by bob 
physics
A 150 N block is at rest on a table, a cable is connected from this block to another hanging off of the table. This block is 75 N. What is the magnitude of the minimum force of static friction on the 150 N block required to hold both blocks at rest? What
asked by kacey 
physics
A plane leaves Seattle, flies 84.0{\rm mi} at 21.0^\circ north of east, and then changes direction to 52.0^\circ south of east. After flying at 120{\rm mi} in this new direction, the pilot must make an emergency landing on a field. The Seattle airport
asked by Julio 
chemistry
Lime, CaO, is produced by the decomposition reaction CaCO3(s) ® CaO(s) + CO2(g). What weight of CO2 is obtained by the decomposition of 38.7 g of CaCO3?
asked by Anonymous 
Maths
A container in the shape of a right circular cone with vertex angle a right angle is partially filled with water. a) Suppose water is added at the rate of 3 cu.cm./sec. How fast is the water level rising when the height h = 2cm.? b) Suppose instead no
asked by leone 
Chemistry
After 4.00 mol of C2H4(g) and 2.50 mol of Br2 (g) are placed in a sealed 1.0L container, the reaction reaches equilibrium and is written following: C2H4(g) + Br2(g) > C2H4Br2(g) ... Calculate the equilibrium concentrations of all three substances.
asked by Sarah 
physics
On a drive from your home to town, you wish to average 52 mph. The distance from your home to town is 106 miles. However, at 53 miles (half way), you ﬁnd you have averaged only 39 mph. What average speed must you maintain in the remaining distance in
asked by amanda and leah 
PreCalculus
Which sets of ordered pairs represent functions from A to B? Explain. A = {a, b, c} and B = {0, 1, 2, 3} A. {(a, 1), (c, 2), (c, 3), (b, 3)} B. {(a, 1), (b, 2), (c, 3)} C. {(1, a), (0, a), (2, c), (3, b)} D. {(c, 0), (b, 0), (a, 3)} I narrowed it down to
asked by Peter 
chemistry
Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCL(aq)=>ZnCl2(aq)+H2(g). How many mm of 1.50M HCL(aq) are required to react with 9.05 g of ZN?
asked by Mimi 
math
Two trains heading toward each other are 400 miles apart. One train travels 15 miles per hour faster than the other train. If they arrive at the same station in 5 hours, how fast is each train traveling?
asked by stephanie 
trig
(sec 8 x  1)/(sec 4x 1) = tan 8x/tan 4x Prove it!
asked by vidhu 
algebra
A tugboat goes 180 miles upstream in 15 hours. The return trip downstream takes 10 hours. find the speed of the tugboat without a current and the speed of the current
asked by maggie 
physics 102
three lamps connected to a 120V AC (rms) household supply voltage. Lamps 1 and 2 have 75.0W bulbs; lamp 3 has a 40.0W bulb. (a) For each bulb, find the rms current. Irms, lamp 1 = A Irms, lamp 2 = A Irms, lamp 3 = A (b) For each bulb, find the
asked by Matt Will 
physics
Find the Magnitude of the force exerted by each cable to support the 625 N punching bag. One cable is connected to the ceiling with an angle of 37 degrees and the other cable is connected perpendicular to the side wall (Horizontal). HELPP
asked by kacey 
chemistry
Concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? My calculation 500ml x 1:200 =2.5 1:200 means
asked by Fai 
chemistry
A stock solution containing Mn2+ ions was prepared by dissolving 1.168 g pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. Calculate the concentration of the stock solution.
asked by rachel 
Public Health
All of the following are true of lead as an environmental hazard except? a. Paint in toys is an important potential source of lead exposure. b. The higher the blood lead levels the more severe the biological effects due to lead poisoning. c. Paint in homes
asked by Antuan 
Chemistry
Assume that the ionic compound CaCl2, separates completely into Ca and Cl ions when it dissolves in water. How many moles of each ion are present in the solution???
asked by Serena 
Physics
A block of mass m has a spring –spring constant k and length L –connected, vertically, to the bottom. The block is dropped from height h, towards the floor. Assuming the spring is stiff enough that it does not compress fully at the floor, what is the
asked by Chad 
chemistry
Concentrated hydrochloric acid has specific gravity of 1.18 and 36% hcl weight. What volume of concentrated hcl must be diluted to give 50 gm of 10 percent. My calculation 50gm x 0.1 = 5gm 5gm x 36.5 = 182.5 182.5 / 0.36 = 506.9 506.9 / 1.18 = 430 ml This
asked by Fai 
physics
You can keep a 3 kg book from dropping by pushing it horizontally against a wall. What force must you apply to the book to keep it from falling? What is the coefficient of static friction?
asked by kacey 
biology
Trophic Level Cylinder Volume of H2O Volume of Oil Total Volume % Oil 1st 1000 ml 1000 ml 2nd 100 ml 100 ml 3rd 10 ml 10 ml
asked by kiesha 
Art Appreciation
Discuss how art was used as a vehicle for propaganda, and whether such use is present in the works of Höch, Grosz, and Picasso. Use one example from Gardner's Art through the Ages and one from the Internet.
asked by Robert 
statistics (math)
The following equation can be used to predict the average height of boys anywhere between birth and 15 years old: y = 2.79x +25.64 where x is the age (in years) and y is the height (in inches). a. What does the slope represent in this problem? Interpret it
asked by karen 
Physics
A body of mass 10kg moving with velocity 30m/s collide with another body of mass 15kg.If the velocity of both the body are same after collision.Then find their common velocity.
asked by Aarushi 
Child Development
Written observations of children as their behaviors occur in their context are termed:
asked by Sandra 
Math
Given the following system is consistent x+y=1 tx+y=t (1+t)x+2y=3 Find the exact value of t.
asked by Anonymous 
reading
In order to get an idea of significant subject areas in a chapter, it is best to read the: A. subheads. B. graphics. C. captions. D. table of contents.
asked by chris 
consumer math
The Mannings file a tax return showing $125000 in earned income, $3288 from interest income, and they have a tax credit of 1% of their earned income. They claim 5 exemptions of $2500 each, one head of household exemption of $10500, pretax medical
asked by Megan 
physics 102
What are the wavelengths of electromagnetic wave in free space that have the following frequencies? (a) 3.00 10^19 Hz pm (b) 7.50 10^9 Hz cm
asked by Matt Will 
College Algebra
1. Use the Intermediate Value Theorem to show that the polynomial function has a zero in the given interval. f(x) = 13x^4  5x^2 +7x 1; [3,0] Enter the value of (3). 2. Use the Intermediate Value Theorem to show that the polynomial function has a zero in
asked by Kameesha 
Politics/Debate
what does this sentence mean in regular english "The United States Federal Government should substantially increase development of domestic infrastructure." and what is the basic meaning of domestic infrastructure? Tahnk you soo much in advance!!
asked by Samantha 
Physics
Box, mass m 1 , at rest against a compressed spring, spring constant k and compression of Δx, at the top of a ramp, height h, is released. It slides down the ramp, angle θ, with friction, coefficient μ. Half way down the ramp, it bumps into and sticks
asked by Chad 
math investment
8. (TCO A) You can tax shelter only onehalf of your retirement savings. You want to invest onehalf of your savings in bonds and onehalf in stocks. How much of the bonds and how much of the stocks should you allocate to the tax sheltered investment?
asked by Steven 
math
if the speed of a comet at perihelion (the closest orbital point to the sun) is 98000 mi/h. How far will the comet travel in 30 sec?
asked by angel 
aig math (please answer Ms.Sue)
Albert bought 28 compact discs for $805.give a quick estimate of the cost of each compact disc.
asked by lidia 
Math
Mr. R has some money to buy oranges, if he will buy 15 oranges he will need $90 more, if he will buy 10 oranges he will have $60 left. how much money has mr. R? Please kindly solve this using George Polya method.. guess and check...
asked by Kaloy 
trig
Please help to find the value of: Sin 17 degree.
asked by Anonymous 
science
what is the kinetic energy of a ball with a mass of 5 kg rolling at 10 m/s
asked by kaliyjah 
Math
Point E is on side AB of rectangle ABCD. If the area of ABCD is 48, what is the area of triangle CDE?
asked by Sarah 
math
4 boards (1 inch X 8inchs X 6feet} and 3 boards (1 inch X 6 inches x 4feet}= how many board feet? 1 board foot =1 inch by 12 inches x 12inches
asked by Sam 
Calculus
This is another textbook number that doesn't have the solution and I can't figure it out. Any tips would be greatly appreciated. For each of the plane surfaces, calculate the exact surface area. (Answer in fractions) (a)The surface composed of all surfaces
asked by Paul 
math
what is 4.97x10^6 in standard form
asked by Anonymous 
ss
Describe three social or economic reforms between 1917 and the 1930s that were a result of the mexican revolution? is this good enough.. Obregón, Álvaro, 18801928, president of MEXICO (192024). A successful general in the Mexican revolution (191017),
asked by melissa 
math
john has a loan but doesn't begin to repay his loan for 11 months, at a rate of $500 every month of four month. the interest rate is 8% compounded monthly determin the size of the loan using the following 2 steps 1. calculate the present value, pv1 of
asked by jule 
Physics
Some object moves 220.0 m at an angle of 42° north of west. During this motion, a 68.0 N force acts on the same object, doing +5460.0 J of work on the object. Assuming the force is applied horizontal to ground, what is this force’s orientation? Is there
asked by Chad 
algebra
I need help with doing this problem... 5x7(24x). Any idea how to do it?
asked by Luke 
English
Is this sentence right? I have never had a pet before.
asked by Kelly 
Math
$15,000 in the bank at 3% interest, how much would you have in the bank after one year if the interest were compounded quarterly
asked by Trina 
s.t mary's school
what amout of zinc will be required to generate sufficient hydrogen to completely combined with oxygen obtained by complete decomposition of 30 g of potassium clorate?
asked by lucy 
chemistry
what amout of zinc will be required to generate sufficient hydrogen to completely combined with oxygen obtained by complete decomposition of 30 g of potassium clorate?
asked by lucy 
Math
Mr. R has some money to buy oranges, if he will buy 15 oranges he will need $90 more, if he will buy 10 oranges he will have $60 left. how much money has mr. R?
asked by Kaloy 
Maths
explain subtraction steps
asked by Athrva 
Math
If a=3^2, b=1/a and c=b^4 then a) a>b>c b) a
asked by Bob 
chemistry
please could you identify at least 2 limitations each for the coordinate bonding and metallic bonding theories?
asked by nadia 
aig math
estimate the value. 1705*31
asked by lidia 
Algebra
Why is the correct answer a^2a+1 to this problem: a^3+1/a+1
asked by Taurus 
math
an ordinary anuuity starting in three years with 20 quarterly payment of $400
asked by jule 
Chemistry
COmbination of nahco3andhcl what is before,after,mixture, and change?
asked by Sasha 
Svience
I'm just courious what "ragweed mix" is/are. Is it one type of plant or a bunch?
asked by Kelly 
algebra
A college bookstore ordered six boxes of red pens. The store sold 37 red pens last week and 67 red pens this week. 4 pens were left on the shelf. How many pens were in each box?
asked by Anonymous 
Am i right
Am i right? The question is how Paul Cezanne contributed to art. Is it, because he made his own style with how he used natural forms into shapes and such, and it influenced Picasso and Braque to create Cubism which later influenced others aswell?
asked by Bella 
Physics
The wind blows a 0.50 kg Styrofoam box, initially at rest, across level ground and then up an incline where it comes to a rest. The box slides 6.0 m on level ground before sliding up the 20.0 Ovincline. If the effective coefficient of friction between the
asked by Chad 
science
what is the kinetic energy of a ball with a mass of 5 kg rolling at 10 m/s
asked by kaliyjah 
math
how do i change 0.26(2/3) to a fraction
asked by Karen 
PreCalculus
Determine whether the equation represents y as a function of x. y = 4  x If I plug in 5, then I get 1, but it also means 1. Does that mean y has 2 values which means that it is not a function?
asked by Peter 
human services
how does a child's perspective change in middle childhood?
asked by Susan 
human services
what sex differences in mental abilities become evident in adolescence?
asked by Susan 
Chemistry
How many grams of CaSO4 are present in 320ml of a 0.00810 M solution of this compound?
asked by Jim 
statistics
Q) 75% of the population in Guinea, Africa is infected with malaria. Suppose a physician sees 6 patients in a given hour. Assuming these conditions are met, find the mean and standard deviation of the distribution. Help please!
asked by nick 
microbiolab
what is the importance of using the McFarland standard?
asked by bing 
ENGLISH
In the following sentence, what is the subject complement? My neighbor is a newspaper reporter.
asked by Anonymous 
math
If it takes 6 minutes to travel from Point A to Point B at a constant speed of 60 miles per hour, how many minutes does it take to travel the same route from point A to point B a constant speed of 50 miles per hour? I need an equation and a thorough/ clear
asked by anony 
math
4000*1365000 explain substraction
asked by Athrva 
history
When postwar expansion slowed in the 1950s, an economic stimulus was provided by A. increased consumer goods manufacturing. B. Cold War spending. C. the construction of Levitt Towns. D. the baby boom.
asked by Help please =) 
English
What synonym of crumble can replace it in this sentence: "The town slowly crumbled"?
asked by Barbie 
environmental science
describe three common challenges with managing non renewable energy sources.
asked by TIA 
Math
waht are lapse
asked by Einstein 
Law
What is Jones Act (maritime area)?
asked by dave 
Math
dear Ms.Sue what do they mean when they say find the tiime lapse.
asked by Einstein 
Psychology
Describe in detail, the two methods of language acquisition?
asked by Shahara 
Math
here is the problem Ms.Sue 6:32,9:29.
asked by Einstein 
Child Development
Which perspective believe growth and development are primarily controlled by nature?
asked by Sandra 
writing
when you write a sentence, how do you know what a verb, adj.or conjuction is?
asked by Dee 
hwwt
why do paras have to document everything a child does?
asked by Dee 
Chemistry
How many grams of a 12.5% (w/w) aqueous solution of HCl do you have to measure out if yo need 32g Of HCl?
asked by Jim