Questions Asked on
December 20, 2010

physics help please...
A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the massspring system is allowed to come to static equilibrium. What is the
asked by julie 
chemistry
Calcium chloride, CaCl2, has been used to melt ice from roadways. Given that a solution is 25% CaCl2 by mass, estimate the freezing point.
asked by Akkam 
Physics
A 2.00kg block of ice is at STP (0¢XC, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34 „e 105 J/kg)
asked by Shawn 
Physics
A car goes through a curve with a constant velocity of 60mph and experiances a centripital acceleration of 77.4 ft/secsquared. Find the radius of the curve.
asked by Elise 
chemistry
What mass of water, in grams, would have to be decomposed to produce 28.7 L of molecular oxygen at STP?
asked by Lisa 
physics
anyone??? A juggler throws a ball from height of 0.950 m with a vertical velocity of +4.25 m/s and misses it on the way down. What is its velocity when it hits the ground? thanks.
asked by sabeen 
algebra
what is a good number sentence to show that 5 is a factor of 35?
asked by kai 
trig
Find the value of secant theta for angle theta in standard position if a point with coordinates (3/4) lies on its terminal side
asked by Mallory 
chemistry
8. If x grams of S are needed to obtain 0.4 grams of SO3, how many grams of SO2 can be obtained from the same amount of S? (A) 0.32 g (B) 0.62 g (C) 0.40 g (D) 0.16 g (E) Can not be calculated from the given data. I am not sure how to set up this problem.
asked by Anna 
Physics
A 0.20kg block rests on a frictionless level surface and is attached to a horizontally aligned spring with a spring constant of 40 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic
asked by Shawn 
economics
"The Fed should simply increase the money supply at the same rate that the full employment economy grows, and the government should desist from any stabilizing urges." What school of thought would make this suggestion, and how do economists of that school
asked by tom 
physics
A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the massspring system is allowed to come to static equilibrium. What is the
asked by julie 
PHYSICS
an arctic flying to antarctica encounters a storm. The term changes direction to fly around the storn. if the tern flies 46 km at 15degrees south of east , 22 km at 13 degrees east of south , and finally 14km at 14 degrees west of south what is the tern's
asked by mike 
AP Physics
A young male adult takes in about 4.0 104 m3 of fresh air during a normal breath. Fresh air contains approximately 21% oxygen. Assuming that the pressure in the lungs is 1.0 105 Pa and air is an ideal gas at a temperature of 310 K, find the number of
asked by Cheyenne 
Physics
A rollercoaster car speeds down a hill past point A where R1 = 9.8 m and then rolls up a hill past point B where R2 = 15.8 m (R1 and R2 represent the radiuses/ radii) The car has a speed of 18.6 m/s at point A. if the track exerts a normal force on the
asked by Tori 
math
How do u solve this I(2)(2)I +86 I3I +3(2) an the "I" represents a parellel line
asked by Anonymous 
PHYSICS
A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 175 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?
asked by marco 
Math
make a conjecture (obsevations based on patterns) for each sequence below. a)7,10,13,16 b)4,44,444,4444,44444 c)2,10,50,250 d)1,2,6,42,1806,3263442 i got some of them but i think they need to be writen better a)Add three to each number to get the next
asked by Dan 
physic HELP
On a banked race track, the smallest circular path on which cars can move has a radius r1 = 106 m, while the largest has a radius r2 = 153 m, as the drawing illustrates. The height of the outer wall is 18 m. Find the smallest speed at which cars can move
asked by jessica 
physics problem
A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 175 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?
asked by marco 
physics
anyone else know how to go about solving this complicated problem? Your friend has climbed a tree to a height of 6.00 m. You throw a ball vertically up to her and it is traveling at 5.00 m/s when it reaches her. What was the speed of the ball when it left
asked by sabeen 
economics
If the equilibrium price of an hour with a personal trainer is $45 and the market price is currently $55, then there is: A. a surplus of personal trainers. B. a shortage of personal trainers. C. equilibrium D. none of the above I think it's A?
asked by tony 
Health
roles, requirements or other credentials to fill your chosen role.
asked by Shala 
english
In what sentence is a homonym used correctly? A. If you ask me, there's hobby like fishing. B. How many ours do we have to wait? C. Karen's new dog had flees. D. We had chocolate ice cream for desert.
asked by Meosha 
economics
Black markets result from: A. price floors B. price ceilings C. shifts in demand D. competitive price outs I think it's C?
asked by tony 
10th grade
How many grams of water vapor (H2O) are in a 10.2 liter sample at 0.98 atmospheres and 26°C?
asked by jeremy 
science
how does the distribution of animal tissues in an organism difer from the distribution of tissues in a plant
asked by nick 
economics
When quantity supplied equals quantity demanded: A. there is disequilibrium B. the marked is cleared C. there is excess quantity demanded. D. there is excess quantity supplied I'm stuck between C and D but I think it's D?
asked by tony 
7th PreAlgebra Word Problem
Approximately oneseventh of the people in the United States are lefthanded. The population of the United States is about 300 million. Write and solve an equation to estimate howmany people in the United States are left handed.
asked by Bob 
physics
a dog runs down the road at 8 m/s. a car falls in front of him, making him stop. how long would it take him to stop of the coefficient of friction is .47?
asked by danielle 
japanese
What do the following sentences mean translated to English? Kore no han wa watashi no desu To no soto ni obaki ga imasu
asked by Elizabeth 
math
If 10 is removed from the set of whole numbers, is the set closed with respect to addition? Explain why or why not.
asked by Diana 
economics please ?
When quantity supplied equals quantity demanded: A. there is disequilibrium B. the marked is cleared C. there is excess quantity demanded. D. there is excess quantity supplied I'm stuck between C and D but I think it's D?
asked by tony 
math
If gas cost $ 2.20 per a gallon and you drive 130 miles at 10 miles per a gallon how much will your trip cost?
asked by tenesha 
Spanish
How would you say "the knitting held together"  I can't seem to find the right verb for held
asked by Amy 
medical terminology
The bx of the skin lesion was benign. What does the abbreviation bx stand for? A. Bactroban C. Basal cell carcinoma B. Biopsy D. Burn xeroderma
asked by judith 
Precalc
The number N of bacteria in a culture is given by the model N=250e^kt where t is the time (in hours). If N=280 when t=10 estimate the time for the population to double in size.
asked by L 
math
Bill needs to buy 24 bottles of soda. Each bottle is $ 1.75 including tax. If he has a hundred dollar bill how much change will he get?
asked by tenesha 
social studies
A socialist economy is characterized by: A. an extensive reliance on markets to allocate final goods and services. B. an extensive reliance on the profit motive to govern resource allocation decisions C. elimination of the problem of scarcity since all
asked by ciara 
Social Studies
How did geographic conditions in Panama make it difficult to build a canal there?
asked by Teonia 
Physics
A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.16 and the push imparts an initial speed of 4.2 m/s?
asked by Thao 
math
Write fraction in lowest terms 0.05
asked by tenesha 
Spanish
how to write "socks of wool"  calcetines de lana OR calcetines de lanas?
asked by Amy 
calculus
The number N of bacteria in a culture is given by the model N=250e^kt where t is the time (in hours). If N=280 when t=10 estimate the time for the population to double in size.
asked by L 
t test
What is the power of each of the following studies,(t test chart) using a t test for dependent means (based on the .05 significance level)?
asked by wallic 
t test
A researcher theorized that people can hear better when they have just eaten a large meal. Six individuals were randomly assigned to eat either a large meal or a small meal. After eating the meal, their hearing was tested. The hearing ability scores (high
asked by wallic 
math
what are two ways to skip count to find 2x 5? is 115 a multiple of 5? i also need to explain how i would know...
asked by shy 
physics
A 5kg ball is thrown upward with an initial speed of 30m/s. Suppose there is a constant air resistance of 25N opposing the motion during its entire up and down path. How much work was done by air resistance during the entire path up and down. Wfric= f X
asked by dipset 
Physics
The period of revolution of a satellite is 90min. What is the altitude above the surface of the earth?
asked by Elise 
physics
a very strong young child tosses a stone into the air. his father times the stone's travel and finds that it takes the stone 2.8 seconds to return to the child's hand. how high did the stone rise?
asked by Anonymous 
chemistry
determine the mass of phosphoric acid that can be produced by the reaction of one thousand tons of phosphate rock and sulfuric acid
asked by Sue 
math
what are two ways to skip count to find 2x 5? is 115 a multiple of 5? i also need to explain how i would know...
asked by shy 
Physics
A high diver of mass 52 kg jumps off a board 11 m above the water. If, 4.7 s after entering the water his downward motion is stopped, what average upward force did the water exert?
asked by Anonymous 
spanish
how we say :candy canes ,poinsettia, in spanish
asked by joy 
trig
what is the amplitude, period and phase shift of y= 8cos (x90)
asked by Erickaaa 
12th grade chem
why is it that only the first hydrogen bond in a polyproptic acid strong?
asked by sam 
trig
Find the value of secant theta for angle theta in standard position if a point with coordinates (3/4) lies on its terminal side
asked by Mallory 
dade
If a stone is tossed from the top of a 250 meter building, the height of the stone as a function of time is given by h(t) = 9.8t2 – 10t + 250, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to
asked by max 
physics
A 8kg ball is thrown up with an initial speed of 20m/s. Suppose there is a constant air resistence of 30N opposing the motion during its entire up and down path. How long will it take to get to the highest point in its path? how high is the highest point?
asked by dipset 
physics
A particle with a charge 7C and a mass of 20kg is traveling in a circular path around a fixed particle of charde 5C. The velocity is observed to be 3000m/sec. What is the radius of the circular path?
asked by dipset 
trig
a plane flies due east for 500 km. and then turns on a heading of 120 degrees for 150 km. What are its distance and bearing from its starting point?
asked by Anonymous 
physics
A particle with a charge 7C and a mass of 20kg is traveling in a circular path around a fixed particle of charde 5C. The velocity is observed to be 3000m/sec. A 9C particle with the same velocity is instead in the presence of a uniform electric field of
asked by dipset 
math
the study hours are 4, 10, 20, 24, 34, 36, 42 and the z scores are 2.5, negative 1.75, negative .5, 0, 1.25, 1.5, 2.25 and the percentile ranks are 10,25,35,40,50,75,95 what is the study hour with a z score of 1.75, what is the standard deviation of all
asked by christina 
social studies
Under capitalism the role of the government is best described as: A. nonexistent B. limited C. significant D. extensive I chose B, am I right?
asked by ciara 
economics PLEASE HELP
According to the permanent hypothesis, households will tend to react to a temporary tax cut by: A. assuming the new tax level will be permanent. B. saving most of the additional disposable income. C. increasing consumption sharply in response to the higher
asked by tony 
velocity
crystal can ride her bike 10 km in 2.1 hours, what is her average velocity?
asked by jessica 
History WWII
Is the Potsdam Proclamation and the Potsdam Declaration the same thing?
asked by Amy 
physics
a 8 kg ball is thrown upward with an initial speed of 20 m/s. suppose there is a constant air resistance of 30N opposing the motion during it entire up and down path. what is the acceleration on the way up and on the way down?
asked by sacrifice 
polymer
how can we set up column for monomer purification give the minimum lenth and diametter for the column.
asked by pradee 
chemistry
give the solgel preparation of zirconium oxide powder
asked by pradee 
Chemistry
Please, what is the balanced equation for Potassium Bitartrate and Sodium Bicarbonate? Is there any easy way to remove the resultant sodium compound? THANKS.
asked by Doc 
Physics
A 200kg motorcycle is driving in a circular path at 1 rev per 5 seconds and the circle has r=12m
asked by Ashley 
Business Algebra
Invest $23,000 in a savings account at 4.25% interest compounded quarterly. Invest into an ordinary annuity where $5,000 is deposited each year into an account that earns 6.6% interest compounded annually.
asked by Diane 
Chemistry
A solution is made up by dissolving 14.8 g Na2CO3 · 10 H2O in 110.5 g of water. What is the molality of Na2CO3 in this solution?
asked by Jintau 
chemistry
The diving atmosphere used by the U.S. Navy in its undersea SeaLab experiments consisted of 0.036 mole fraction O2 and 0.058 mole fraction N2, with helium (He) making up the remainder. What are the masses of nitrogen, oxygen, and helium in a 7.22g sample
asked by Nagaa 
science
the history of tfe atom
asked by the history of the atom 
Physics
The frequency of an electon orbiting a nyclear is 1000000000 cps and the radius is 5 * 10 to the 12m. Find the velocity of the electron.
asked by Elise 
statistics
is 30 years the average age of a population? describe its population and distribution
asked by tasha 
spanish
"Doctor Pérez, me duele mucho la pierna. ¡Ay!" "Miguel, ¿te duele _____ ?" a. la derecha o la izquierda b. el derecho o el izquierda c. la morada o la rosada d. la quinta o la séptima A? My teacher says it is D. What do you think?
asked by Lily 
spanish
"Mi abuela está en el hospital." "Qué lástima! ____" a. No vale la pena. b. ¿Qué te duele? c. No lo sabía. d. ¿Qué tienes? D? My teacher says A, but it doesn't make sense to me.
asked by Lily 
Goemetry
Two parallel lines are cut by a transversal. Angles M and P are alternate interior angles. Angle M measures (10x + 50)° and angle P measures (12x + 30)°. What is the measure of angle M?
asked by Marquise 
everest
The temporary owners equity are closed because they apply to only one accounting period?
asked by Anonymous 
physics
Two sinusoidal waves of the same frequency travel in the same direction along a string. If ym1 = 4.2 cm, ym2 = 5.9 cm, ö1 = 0, and ö2 = /5 rad, what is the amplitude (in cm) of the resultant wave?
asked by mounir 
Physics
Given that electricity is priced at constant 13.5 pence per kWh and central heating oil (kerosine) varies in price between 39 pence and 137 pence per litre. What price does kerosine need to be to make heating domestic hot water cheaper using an immersion
asked by Mike 
Math symbols
What does * mean in math? thanks for ur help Abby
asked by Abby 
sat essay!
question: what are your thoughts onthe idea that television has turned out to isolate people instead of bringing them together. my essay; please evaluate! to say that television has turned out to isolate people instead of bringing them together holds true
asked by mahwish 
eng
where does scene one take place in act four ?
asked by mugga 
allied health
Suppose the legislature of Pennsylvania adopts a new law. This type of law is called a/an A. bill. B. code. C. statute. D. ordiance. I think it is C. but with what I had read it maybe A. I am stuck with these two help what is the difference?
asked by Benn 
11th grade
a race car travels along a raceway at a constant velocity of 200 km per hour.what horizontal force acts and what is the net force acting on the car?
asked by Anonymous 
MATH
Two polygons are congruent and the perimeter of the first polygon is 38 cm. If the sides of the second polygon are consecutive integers (x, x+1, x+2, x+3, etc.), what value of x makes the polygons into congruent quadrilaterals? Use x as the smallest side.
asked by Anonymous 
physics
The displacement vector for a 15.0 second interval of a jet airplane's flight is (3150, −2430) m. (a) What is the magnitude of the average velocity? (b) At what angle, measured from the positive x axis, did the airplane fly during this time interval?
asked by calantha 
physics
A 2kg ball attached to the ceilling with a string is released and swings back and forth. Assume there is no air resistance. At the bottom of the path the lowest point the velocity is 4m/s. What is the velocity when it returns to the lowest point
asked by karen 
10th grade
i have an equation; x^2+3x18=0. i am given one of the roots, of which is 3, but how do i find the other root.
asked by isaiah 
math
Assume that you start with $900 per month healthcare increase and add five percent(5%) per year for the two (2) remaining years of a three year contract. Show the cash value and rollup value of the increase
asked by Rochelle 
physics
umm i need help...which equation would i use to solve the probnlem and how do i go about finding the answer? Here it is: Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?
asked by tj 
Math
a person cleared a rectangular plot of land and covered it with gravel. then he got 9 square wooden sections of side lengths: 2,5,7,9,16,25,28,33 and 36. by placing the squares on the gravel with no two overlaping, the person built a patio which exactly
asked by John 
statistics
The average age of a vehicle registered in the U.S. is 8 years, or 96 months. If a random sample of 36 vehicles is selected, find the probability that the mean of their age is between 98 and 100 months. Assume the standard deviation for the population is
asked by Jana 
4th grade
23x17 in expanded algorithm
asked by jayline 
English
Can you check these sentences for me, please? Thank you. 1) I had a terrible pain in my tooth. I went to the dentist and he told me my molar was decayed (or I had a decayed tooth and it needed filling?) 2) The filling has come out of my tooth. 3) You use a
asked by Franco 
methods of sbtracting mixed fractions
Hello, I need did a subtraction problem with mixed numbers by converting the LCD of the denominator. However, when I went to Algebra.help they did the problem by converting the mixed problem to an improper fraction and then worked it that way. However, I
asked by Suzanne 
Statistics
If the standard deviation of a population is 56 and we want the standard error (the standard deviation of the sample mean) to be 14, then we need to take how many samples?
asked by Jana 
physics
An empty rubber balloon has a mass of 0.0100 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.300 m. If the filled balloon is fastened to a vertical line, what is the tension in
asked by april 
physics
A juggler throws a ball from height of 0.950 m with a vertical velocity of +4.25 m/s and misses it on the way down. What is its velocity when it hits the ground?
asked by sabeen 
physics
Your friend has climbed a tree to a height of 6.00 m. You throw a ball vertically up to her and it is traveling at 5.00 m/s when it reaches her. What was the speed of the ball when it left your hand if you released it at a height of 1.10 m?
asked by sabeen 
physics
Sam tosses a ball horizontally off a footbridge at 3.2 m/s. How much time passes after he releases it until its speed doubles?
asked by dan 
HIT
ABC Health Care’s insufficient recordtracking system has created a backlog of incomplete medical records.
asked by Shala 
Finance
You made a bank deposit in UK sterling that matures next December. The interest rate was 10% while home rates are only 4%. You thought you would be going to London at the end of the year, but now you cannot. The outlook for pounds is depreciation, but you
asked by Michelle 
Math
m+8+2+n
asked by Andrew 
Math
Combine like terms a + a/4 + 3a/4 + 2a
asked by Andrew2 
Math
How many terms are in this sum? 5x  6a + 8
asked by Andrew3 
AP Physics
The surface of the sun has a temperature of about 6.0 103 K. This hot gas contains hydrogen atoms (m = 1.67 1027 kg). Find the rms speed of these atoms.
asked by Kieran 
Math
determine whether each conjecture is true or false. Give a counterexample for any false conjecture Given: Points A and B are collinear. Conjecture: Points A and B form a line.
asked by Cee 
Personal Finance
What is the risk and return on stocks, bonds, and mutual funds? Thanks
asked by Sarah 
music read
I need to learn one whole song,I want to do smoke on the water, I need help.
asked by shane