# Questions Asked onDecember 20, 2010

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 mass-spring system is allowed to come to static equilibrium. What is the

2. ## 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.

3. ## Physics

A 2.00-kg 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)

4. ## 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.

5. ## chemistry

What mass of water, in grams, would have to be decomposed to produce 28.7 L of molecular oxygen at STP?

6. ## 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.

7. ## algebra

what is a good number sentence to show that 5 is a factor of 35?

8. ## 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

9. ## 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.

10. ## Physics

A 0.20-kg 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

11. ## 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

12. ## 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 mass-spring system is allowed to come to static equilibrium. What is the

13. ## 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

14. ## AP Physics

A young male adult takes in about 4.0 10-4 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

15. ## Physics

A roller-coaster 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

16. ## math

How do u solve this I(-2)(2)I +8-6 I3I +3(-2) an the "I" represents a parellel line

17. ## 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?

18. ## 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

19. ## 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

20. ## 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?

21. ## 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

22. ## 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?

23. ## Health

roles, requirements or other credentials to fill your chosen role.

24. ## 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.

25. ## economics

Black markets result from: A. price floors B. price ceilings C. shifts in demand D. competitive price outs I think it's C?

How many grams of water vapor (H2O) are in a 10.2 liter sample at 0.98 atmospheres and 26°C?

27. ## science

how does the distribution of animal tissues in an organism difer from the distribution of tissues in a plant

28. ## 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?

29. ## 7th Pre-Algebra Word Problem

Approximately one-seventh of the people in the United States are left-handed. 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.

30. ## 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?

31. ## japanese

What do the following sentences mean translated to English? Kore no han wa watashi no desu To no soto ni obaki ga imasu

32. ## math

If 10 is removed from the set of whole numbers, is the set closed with respect to addition? Explain why or why not.

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?

34. ## 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?

35. ## Spanish

How would you say "the knitting held together" - I can't seem to find the right verb for held

36. ## 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

37. ## 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.

38. ## 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?

39. ## 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

40. ## Social Studies

How did geographic conditions in Panama make it difficult to build a canal there?

41. ## 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?

42. ## math

Write fraction in lowest terms 0.05

43. ## Spanish

how to write "socks of wool" - calcetines de lana OR calcetines de lanas?

44. ## 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.

45. ## 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)?

46. ## 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

47. ## 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...

48. ## 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

49. ## Physics

The period of revolution of a satellite is 90min. What is the altitude above the surface of the earth?

50. ## 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?

51. ## chemistry

determine the mass of phosphoric acid that can be produced by the reaction of one thousand tons of phosphate rock and sulfuric acid

52. ## 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...

53. ## 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?

54. ## spanish

how we say :candy canes ,poinsettia, in spanish

55. ## trig

what is the amplitude, period and phase shift of y= 8cos (x-90)

why is it that only the first hydrogen bond in a polyproptic acid strong?

57. ## 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

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

59. ## 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?

60. ## 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?

61. ## 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?

62. ## 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

63. ## 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

64. ## 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?

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

66. ## velocity

crystal can ride her bike 10 km in 2.1 hours, what is her average velocity?

67. ## History WWII

Is the Potsdam Proclamation and the Potsdam Declaration the same thing?

68. ## 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?

69. ## polymer

how can we set up column for monomer purification give the minimum lenth and diametter for the column.

70. ## chemistry

give the solgel preparation of zirconium oxide powder

71. ## 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.

72. ## Physics

A 200kg motorcycle is driving in a circular path at 1 rev per 5 seconds and the circle has r=12m

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.

74. ## 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?

75. ## chemistry

The diving atmosphere used by the U.S. Navy in its undersea Sea-Lab 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 7.22-g sample

76. ## science

the history of tfe atom

asked by the history of the atom
77. ## 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.

78. ## statistics

is 30 years the average age of a population? describe its population and distribution

79. ## 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?

80. ## 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.

81. ## 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?

82. ## everest

The temporary owners equity are closed because they apply to only one accounting period?

83. ## 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?

84. ## 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

85. ## Math symbols

What does * mean in math? thanks for ur help Abby

86. ## 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

87. ## eng

where does scene one take place in act four ?

88. ## 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?

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?

90. ## 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.

91. ## 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?

92. ## 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

i have an equation; x^2+3x-18=0. i am given one of the roots, of which is 3, but how do i find the other root.

94. ## 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 roll-up value of the increase

95. ## 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?

96. ## 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

97. ## 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

23x17 in expanded algorithm

99. ## 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

100. ## 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

101. ## 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?

102. ## 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

103. ## 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?

104. ## 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?

105. ## 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?

106. ## HIT

ABC Health Care’s insufficient record-tracking system has created a backlog of incomplete medical records.

107. ## 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

m+8+2+n

109. ## Math

Combine like terms a + a/4 + 3a/4 + 2a

110. ## Math

How many terms are in this sum? 5x - 6a + 8

111. ## 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 10-27 kg). Find the rms speed of these atoms.

112. ## 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.