Questions Asked onDecember 4, 2010

1. Physics

A 4.00-m-long, 500 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about

2. calculus

The strength of a rectangular beam is proportional to width*depth^2. What are the dimensions of the strongest rectangular beam that can be cut out of a 12 inch diameter log?

3. Chemistry

A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from a. 200. K to 400. K b. 200. C to 400. C How do you know if it's kelvin or celsius? k= c

4. Chemistry

In the reaction: P4 (S) +Cl2 (g)PCl5(s), 1. If you have 10.00 grams of Phosphorus to react with 220 grams of Chlorine gas, what would be the theoretical yield of PCl5(s), in grams? 2. Why was there condensation of the beaker of cold water when a blue

5. chemistry

The copper(I) ion forms a chloride salt that has Ksp = 1.2 10-6. Copper(I) also forms a complex ion with Cl ‾. Cu+(aq) + 2 Cl ‾(aq) reverse reaction arrow CuCl2‾(aq) K = 8.7 104 Calculate the solubility of copper(I) chloride in pure water. (Ignore

6. physics

A car is driven 145 km west and then 65 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

7. chemistry

What is the lattice energy of NaBr? heat of formation of NaBr = -362 kJ/mol heat of sublimation for Na = 107.30 kJ/mol ionization energy for Na = 496 kJ/mol bond dissociation energy for Br2 = 190 kJ/mol electron affinity of Br = -325 kJ/mol heat of

8. Math

Use the related acute angle to state an equivalent expression: a) tan 110 degrees b)sin 350 degrees

9. Chemistry

For the following reaction, 5.20 grams of propane (C3H8) are allowed to react with with 23.1 grams of oxygen gas. propane (C3H8) (g) + oxygen (g) carbon dioxide (g) + water (g) What is the maximum amount of carbon dioxide that can be formed? grams What is

asked by Austin Jekins
10. Physics

A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.9 m and θ = 11°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction between the sled runners

11. chemistry

a mixture of methane and ethane is stored in a container at 294 mmHg. The gases are burned in air to form co2 and h2o. if the pressure of co2 is 357 mmhg measured at the same temperature and volume as the original mixture, calculate the mole fraction of

12. Maths - Probability

Tickets numbered 1 to 1000 were sold in a raffle for which there was one prize. Mr Kahn bought all the tickets containing at least one '3' because '3' was his lucky number. What was the probability of Mr Kahn winning?

13. Physics

An airplane is traveling v = 850 km/h in a direction 38.5° west of north (Fig. 3-34). Figure 3-34. (a) Find the components of the velocity vector in the northerly and westerly directions. 1 km/h (north) 2 km/h (west) (b) How far north and how far west has

14. math

Complete the following probability distribution table and then calculate the stated probabilities. Outcome a b c d e Probability 0.1 1Your answer is correct. 0.43 0.1 0.27 (a) P({a, c, e}). 2Your answer is correct. (b) P(E ∪ F), where E = {a, c, e} and F

15. Chemistry

Write a nuclear equation for the most likely mode of decay for each of the following unstable nuclides: Kr-74, Th-221, Br-85, Ar-33

16. Physics

a 55 kg skateboarder starts out with a speed of 1.8 m/s. he does +80 J of work on himself by pushing with his feet against the ground. in addition, the friction does -265 J of work on him. in both cases, the forces doing the work are nonconservative. the

17. chemistry

Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone in kilograms is required to completely neutralize a 5.8×109 L lake with a pH of 5.6? thanks

18. Physics

A nuclear power plant has an electrical power output of 1200 MW and operates with an efficiency of 31%. If excess energy is carried away from the plant by a river with a flow rate of 1.0 x 10^6 kg/s, what is the rise in temperature of the flowing water?

19. English

Can you please check if the following definitions are possible? Thank you 1)The iamb is an unstress-stress pattern like the word "upon". 2) The anapaest is the unstress-unstress-stress pattern. 3)The oxymoron is a figure of speech in which two

Vandalay Industries is considering the purchase of a new machine for the production of latex. Machine A costs \$2,190,000 and will last for 7 years. Variable costs are 38 percent of sales, and fixed costs are \$122,000 per year. Machine B costs \$4,530,000

21. physics

At the instant a traffic light turns green, a car starts moving with a constant acceleration a of 4.00 m/s2. At the same instant a truck, traveling with a constant speed of 10.09 m/s, overtakes and passes the car. How far beyond the traffic light will the

22. chemistry again

calculate the normality of a solution prpared by dissolving 220.0 mg of K2Cr2O7 in 100 ml solution that will be used to oxidize ferrous chloride according to the unbalanced reaction.

23. chemistry

Calculate the pH of 1.28×10−3 M KOH. thanks.

24. Physics - bungee jumping

In a head dip bungee jump from abridge over a river, the bungee cord is fastened to the jumpers ankles. The jumper then steps off and falls towards the river until the cord becomes taut. At that point, the cord begins to slow the jumper's descent, until

25. physics

A wooden box with a mass of 10.0kg rests on a ramp that is inclined at an angle of 25 degrees to the horizontal. A rope attatched to the box runs parallel to the ramp and then passes over a frictionless pulley. A bucket with a mass of m hangs from the end

26. Physics - elastic collision

A student flings a 23g ball of putty at a 225g cart sitting on a slanted air track that is 1.5m long. The track is slanted at an angle of 25deg with the horizontal. If the putty is traveling at 4.2m/s when it hits the cart, will the cart reach the end of

27. Chemistry

16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams. What is the maximum amount of hydrochloric acid that can be formed? grams What is the FORMULA for the

asked by Austin Jekins
28. math and music

How would you go about listing all of the integer ratios? I would like to have the integers listed in ascending order by the product of each integer's numerator and the denominator. This is because in music, more "complex" ratios sound more dissonant.

29. physics

A force of 100 N is applied tangentially to a disk of radius 10 cm and mass 0.5 kg. the disk is initially at rest. What is the angular acceleration of the disk? How many revolutions does the disk goes through after 10 sec. How much rotational work was done

30. physics

The space probe Deep Space I was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of

31. physic

A water skier has a mass of 73 kg. Find the magnitude of the net force acting on the skier when she lets go of the tow rope and glides to a halt in 20 s.

32. physicccs!

A paraglider is flying horizontally at a constant speed. Assume that only two forces act on it in the vertical direction, its weight and a vertical lift force exerted on its wings by the air. The lift force has a magnitude of 1900 N. For both questions,

33. Math

Given angle theta is bigger than 0 and smaller than 360, determine two possible values of theta where each ration would be true. a) cos theta= 0.6951 b)sin theta= -0.7571

34. Chemistry 22

Determine if the reaction produces a precipitate. For a precipitate mark ‘a’ and if there is no precipitate mark ‘b’. 8. KOH(aq) + Fe(NO3)3(aq)  9. MgCl2(aq) + Na(NO3)2(aq)  10. NaBr(aq) + Ag(NO3) (aq)  11. Na3PO4(aq) + Ba(NO3) 2(aq) 

35. Physics

The blades of a ceiling fan have a radius of 0.399 m and are rotating about a fixed axis with an angular velocity of +1.65 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.08 rad/s2. After 0.520

36. Physics - Dynamics in two dimensions

A sharpshooter shoots the bullet horizontally over level ground with a velocity of 300m/s. At the instant that the bullet leaves the barrel, its empty shell casing falls vertically and strikes the ground with a vertical velocity of 5m/s. How far does the

37. physics

A jet plane is flying with a constant speed along a straight line, at an angle of 25.0° above the horizontal, as Figure 4.30a indicates. The plane has weight whose magnitude is 86500 N, and its engines provide a forward thrust of 103000 N. In addition,

38. physics

A 3.26 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.4 N at an angle theta = 29.0° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.10. What is the speed of the block

39. statistic

Quiz has 6 questions. Each question has five possible answers, only one of each 5 answers is correct. If student randomly guesses on all six questions, what is the probability to answer 2 questions right? Tip: first, you have to define parameters of

40. chemistry

what will be the pH change when 20 mL of .1M NaOH is added to 80 mL of a buffer solution consisting of .164M NH3 and .187M NH4Cl? Pka 9.25

41. Chemistry

Caluclate the delta H for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of liquid pentane is -146.8kJ/mol. Balanced equation balanced equation: C5H12(l)+8O2(g)-->5CO2+6H2O(g) CO2=393.5 H2O=40.7

42. Physics - Collision in teo dimensions(check + help

Car A, with mass of 1735kg, was traveling north at 45.5km/h and car B, with a mass of 2540kg, was traveling west at 37.7km/h when they collided at an intersection. if the cars stuck together after the collision, what was their combined momentum? Was the

43. physics

Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this

44. Physics

How do you find the resultant in terms of components, the magnitude of the resultant, and the resulant's angle above the x-axis?

45. physics

Two blocks of mass m1 = 1.0 kg and m2 = 2.5 kg are connected by a massless string. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.40. Calculate the speed of the blocks after they have moved a

46. physics

A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose cross-sectional area A2 = 0.0600 m2. The gas has a density of ñ = 1.30 kg/m3. The

47. math

How many different pizzas can be made with 5 topping to chose from?

48. Informal Logic

Sometimes people get caught in a “downward spiral,” a case in which something leads to a result which in turn leads to more of the original thing, bringing on more of the result. As the process continues, the result continually gets worse and worse. An

49. chemistry

Given the following reaction: Pd(NO3)2+CaSO4-->PdSO4+Ca(NO3)2 If you started with 225.6ml of 6.32M CaSO4 and the percent yield of this reaction was ol 78.2%, what is the actual yield of grams mod of PdSO4?

50. physics

A 6.00 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1 N at an angle θ= 19.0° above the horizontal, as shown. What is the speed of the block 3.50 seconds after it starts moving?

51. physics

Two blocks of mass m1 = 1.0 kg and m2 = 2.5 kg are connected by a massless string.M1 is on the surface and mass 2 is hanging on the surface. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.40.

52. physics

Two blocks are arranged. M1 is on the table and m2 is hanging from the pulley. The pulley can be considered to be massless, and friction is negligible. M1 is four times more massive than M2. If the system is released from rest, how far will M1 travel in

53. Chmistry

For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the

asked by Austin Jekins
54. physics

A 3.26 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.4 N at an angle theta = 29.0° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.10. What is the speed of the block

55. physics

The drawing shows a hydraulic chamber in which a spring (spring constant = 1292 N/m) is attached to the input piston, and a rock of mass 24.7 kg rests on the output plunger. The piston and plunger are at the same height, and each has a negligible mass. By

56. Critical Numbers

Find the critical numbers of the function on the interval 0 ≤ θ < 2π. f(θ) = 2cos(θ) + (sin(θ))^2

57. Physics

In one cycle a heat engine absorbs 530 J from a high-temperature reservoir and expels 310 J to a low-temperature reservoir. If the efficiency of this engine is 55% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high

58. physics

A 6.00 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1 N at an angle θ= 19.0° above the horizontal, as shown. What is the speed of the block 3.50 seconds after it starts moving?

59. Chemistry

The gram-formula mass of NO2 is defined as the mass of one mole of a. one mole of NO2 b. one molecule of NO2 c. two moles of NO d. two molecules of NO Explain why.

60. Physics - conservative and non conservative (check

If a sled reaches the base of the hill with a speed of 15.6m/s, how much work was done by the snow on the sled between points x and y, where x is 3m above the ground with a velocity of 14.30m/s and y is toughing the ground. the sled and the rider are 70kg

*Only need input not doing it for me. PLEASE QUESTION: Some hydrocarbon fuels have sulfur present and contribute to air pollution. When this solid sulfur is burned in the presence of oxygen, the noxious, toxic gas sulfur dioxide results. If there is .50

62. chemistry

Find the percent by mass of sodium chloride in a 1.35 M NaCl solution. The density of the solution is 1.06 g/mL..............how do I go about doing this question thanks!

Your firm is contemplating the purchase of a new \$869,500 computer-based order entry system. The system will be depreciated straight-line to zero over its 5-year life. It will be worth \$84,600 at the end of that time. You will be able to reduce working

64. phy

An 90 kg person steps into a car of mass 2600 kg, causing it to sink 2.35 cm on its springs. Assuming no damping, with what frequency will the car and passenger vibrate on the springs?

65. Precalc

Find the standard form of the equation of the hyperbola with the given characteristics. foci: (±4, 0) asymptotes: y= +/- 3x

66. Chemistry

What is the lewis structure for Propanoic Acid?

67. physics

A person pulls a toboggan for a distance of 30.0 m along the snow with a rope directed 20.0° above the snow. The tension in the rope is 85.0 N. (a) How much work is done on the toboggan by the tension force?

68. Chemistry

How many grams of BaSO4 can dissolve in 1.5 L of a 0.010 M solution of Na2SO4? Ksp= 1.1 x 10^-10 I thought the answer was 1.1x10^-8 M then multiply by the molar mass to get the amount of grams but my answer isn't correct. PLEASE HELP!

69. Chemistry

Calculate the enthalpy change per gram for the combustion of ethane (C2H6(g)).

70. Physics

A car is driven 145 km west and then 65 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

71. chemistry

If you collect hydrogen gas over water at a temperature of 45 degrees celcius, what is the volume of jst te hydrogen if the pressure of hydrogen is 1.23 atm and the grams of hydrogen was 2.6? What is the volume of the water?

72. Physics - Collision in one dimension

The mass of a uranium-238 atom is 3.95*10^-25kg. A stationary uranium atom emits an alpha particle with a mass of 6.64*10^-27kg. If the alpha particle has a velocity of 1.42*10^4m/s, what is the recoil velocity of the uranium atom. Ans: i tried MaV'a =

73. physics

Two blocks are arranged. The pulley can be considered to be massless, and friction is negligible. M1 is four times more massive than M2. (m1 is on the table and m2 is hanging from the pulley). If the system is released from rest, how far will M1 travel in

74. Chmistry

For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the

asked by Austin Jekins
75. chemistry

oxalic acid, h2c2o4, is a weak acid capable of providing two H3O+ ions. ka=.059 k2=6.4E-5 the [h3o]+ in a .38 M solution of h2c2o4 is .12M and can be calculated by the first ionization step only. what is the equilibrium concentration of the oxalate ion

76. physics

A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.5 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61.0 kg (134.2 lbs) dummy is found to move a distance of 0.750 m from the moment the car

77. physics

A large wooden wheel of radius R and the moment of inertia I is mounted on an axle so as to rotate freely. A bullet of mass m and speed v is shot tangential to the wheel and strike its edge, lodging in the wheel’s rim. If the wheel was originally at

Choose the best revision of this sentence: "I want an interview with you." (Points: 5) I anxiously await a phone call from you so that we can meet to discuss job opportunities. I can't wait to hear from you. Any time at all that you want to call and have

79. Physics

During an acceleration, the angular speed of an engine increases from 900 rpm to 2800 rpm in 4.5 s. What is the average angular acceleration of the engine?

80. Physics

I got part a but I'm having trouble figuring out b... I know the formula should be something like: T=2pi/omega and omega=sqrt(k/m) but how am I supposed to find T when I don't know k or m?? A pendulum has a period of 2.4 s. a) What is its length? l = m *

81. Precalc

Find the center and vertices of the ellipse. 4x^2 + 16y^2 - 64x - 32y + 208 = 0

82. physics

Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 10-5 rev/sec.

83. physics

A constant torque of 20 N.m is applied to a wheel pivoted on a fixed axis. At what rate is power being furnished to the wheel when it is rotating at 0.5 rev/sec?

84. com155

Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used. THIS IS WHAT I WROTE:

85. physics

Two identical containers are open at the top and are connected at the bottom via a tube of negligible volume and a valve which is closed. Both containers are filled initially to the same height of 1.00 m, one with water, the other with mercury, as the

86. AP Physics

A ladder of unknown length and mass of 29 kg rests on a rough floor, and leans against a rough wall. The coefficient of static friction between the ladder and both the floor and wall are 0.68. Hanging on the ladder are two masses. The first mass is 9.9 kg

87. physics

At 10:15 am snail 1 crossed the 65 cm mark with a velocity of 4cm/min. In a great burst of energy, Snail 1 raced to the 90 cm mark in 3 minutes. His velocity as he crossed the 90 cm mark was 7cm/min. What was the acceleration of Snail 1?

88. chemistry

What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

89. physics

A cable is lifting a construction worker and a crate The weights of the worker and crate are 915 and 1430 N, respectively. The acceleration of the cable is 0.620 m/s2, upward. what is the tension in the cable below the worker? what is it above the worker?

90. phyics

A jet plane is flying with a constant speed along a straight line, at an angle of 25.0° above the horizontal, as Figure 4.30a indicates. The plane has weight whose magnitude is 86500 N, and its engines provide a forward thrust of 103000 N. In addition,

91. statistics - math

Sixty percent of the students at a particular community college are female. If 13 students at that community college are selected at random, find the probability that 5 or 6 students will be female. Use Appendix Table or Excel function for Binomial

92. Chemistry

Need Help On This Question.! Potassium chloride reacts with bromine forming potassium bromide plus chlorine. If 500g of potassium bromide are produced, how many grams of potassium chloride reacted?

93. physics

Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and ùE = 1.157 x 10-5 rev/sec.

94. Chemistry

16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams

asked by Austin Jekins
95. Chemistry 22

A 19.18 mL of 0.125 M Oxalic Acid (H2C2O42H2O) is titrated with a Ca (OH)2 solution. The initial volume of Ca(OH)2 was 14.38 and the final volume of Ca(OH)2 was 28.29 mL when the solution turned very slightly pink. What is the concentration of Ca (OH)2?

96. chemistry

Given the following chemical reaction: Zn+HCl-->ZnCl2+H2(g) If you measured the total volume of collected gas over water at 20 degrees celcius t be 428ml at a total pressure of 845 torr, how many milliliters of 2.6M HCl would be required to produce the

97. geology

if the air temperature @ sea level were 23 C what would the air temperature be at a height of 2 km under avg conditions?

98. Chemistry - double replacement +balancing equation

CuSO4 + Na2CO3 I don't know how to do this :( somebody help me :( i think its CuSO4 + Na2CO3 Cu3(CO3)2 + Na2SO4 I have no idea how to balance this. Heelllppp

99. physics

A full can of black cherry soda has a mass of 0.406 kg. It contains 3.38 10-4 m3 of liquid. Assuming that the soda has the same density as water, find the volume of aluminum used to make the can.

100. Math

The shorter leg of a right triangle is 14 feet shorter than the longer leg. The hypotenuse is 26 feet. How long is each leg?

101. Physics

A ball is attached by two springs as shown in the left figure( |wwOww| ).If the mass is displaced a distance âŠ¿x below the equilibrium position h. Determine whether vertical SHM is possible for the system shown. If so, find the natural frequency.

asked by Marco Tsang
102. math - statistics

Football team makes in average 2 touchdowns per game. Use Poisson distribution to find probability that this team will make 5 touchdowns in the next 3 games (adjust ë) Tip: use Poisson Appendix Table or Excel function Poisson(x, ë, false) for x=5 and ë

103. physics

The airplane can take off when its airspeed (speed of the air flowing over the wing) is equal to 65 knots. What is the length of runway required for the plane to take off if there is a 21 knots head wind? The runway at the Tallahassee Regional Airport has

104. physics

This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If

105. Physics

#1.) A solar photovoltaic panel has an area of 3 m^2. The panel's maximum power output is 595 W @ 1100 W/m^2. a) What is its efficiency? b) If the panel receives 1300 W/m^2 of irradiance, what is its new power output? #2.) A solar voltaic module has a

106. physics help

A cylindrical air duct in an air conditioning system has a length of 3.5 m and a radius of 5.00 10-2 m. A fan forces air (ç = 1.8 1 x0-5 Pa·s) through the duct, such that the air in a room (volume = 242 m3) is replenished every 12 minutes. Determine the

107. College physics-oscillations

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume

108. science

which substace's solubility changes the most from 0 degrees celsius to 100 degrees celsius

109. Chemistry

An unknown metal, heated to an unknown temperature until a liquid is dropped into a calorimeter that has 250 ml of water. The water heats up from 22 degrees Celcius to 29 degrees Celcius, at which point the temperature of the water and metal are equal. How

110. Chemistry 22

Your length measurement was 21.34 cm. The ‘accepted value’ was 21.77 cm. What is the percent error of your measurement?

111. english

I have essay exam on martin luther king definition of justice in letter from birmingham jail and need help with this. The letter uses big vocabs and its very complicated to understand its claim, evedience etc.Please help understand this letter so I can

112. algebra

find the present value for \$2000 if interest is 3.5% compounded quarterly for 6 years?

113. chemistry

consider the reaction in which 410g of Ca(NO3)2 react with just the right amount of lithium metal in a single replacement reaction ?

114. chemistry

The new vapor pressure of a solution of 3.25g of an unknown compound in 22.35g of H2O is 114.9mmHg at 55 degrees Celcius. What is the molar mass of the unknown compound?

115. chemistry

How many photons of frequency 2.7*10^14 Hertz would be needed to light a 60 Watt light bulb for 1hr?

116. biology

a fruit is most commonly _______? A. modified root B. a mature female gametophyte c. mature ovary d. a thickened style e. enlarged ovule

117. MATH HELP!!!

Gail spent 3/10 of her day at school, and 3/9 of her day sleeping. About how much of her day is left? A:about 7/10 B:about 1/3 C:about 1/5 D:about 4/10 My answer: I am stuck choosing between 4/10 or 1/3.

118. algebra 1

Determine which real number corresponds to the situation. The record low temperture for a date is 25.6 degrees below zero. The corresponding number for this sentence is-----.

119. physics

What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?

120. Microeconomics

Are monopolies evil? who regulates most monopolies? Are those regulators evil?

121. Chemistry

What is the empirical formula of a compound that has a carbon-to-hydrogen ratio of 2 to 6? Is it CH3?

122. Physics - electric field intesity (check +help)

Points A and B are 13.0 apart. A charge of +8.0mu is placed at A and another charge at +5.0mu is placed at B. Point P i located 5.0cm from A and 12.0cm from B. What is the magnitude and direction of the electric field intensity at P? Ans: i got the

123. physics

The single cable supporting an unoccupied elevator breaks when the elevator is at rest at the top of a 155 m high building. With what speed does the elevator hit the ground?

124. Math070

Is (x-3)(3x+6) factored out completely? Also will a trinomial always factor as the product of two binomials.

125. CHEM

HOW MANY GRAMS OF SALT ARE REQUIRED TO PREPARE 300 G OF 15% SALT SOLUTION? HOW MANY GRAMS OF WATER ARE NEEDED?

126. physics

A solid sphere of radius 3 cm and mass of 100 g rolls down a 30 degree incline from a height of 1 m. A hoop of the same mass and radius rolls down the same incline from the same height. What is the linear velocity of each body at the bottom of the incline?

127. Applied Reseach

For my research paper I wrote about the affects of music on standardized test scores. Basically I tracked scores of elementary and middle schoolers. I compared those who participate in music and those who didn't (quantitative research). Then i wrote a

128. statistics

A large number of samples of size ‘n’ are selected from a population and the mean of each sample is determined. What can be said about the mean of the sample means

I need to know the web site for information on the UCITA and UCC.

130. math

the lengths of the sides of four triangles are listed as follows. which two triangles are similar? explain. a~ 5 cm, 6 cm, 8 cm b~ 6 cm, 7 cm, 8 cm c~ 8 cm, 10 cm, 12 cm d~ 12 cm, 15 cm, 18 cm

131. physics

Two blocks with mass m1 = 4.2 kg and m2 = 4.7 kg are connected by a massless string over a frictionless and massless pulley. The angle of the incline is equal to 27.5°. The kinetic coefficient of friction between m1 and the incline is 0.28. What is the

Which of the following is the BEST advice for increasing the number of "hits" on a scannable résumé? (Points: 5) Avoid jargon of any sort. Use a Keywords section under your name, address, and phone. Use more verbs than nouns. Use only one page. I think B

133. phy

2 kg of water at 5 celsius is added to ice at 0 celsius. The ice and water make up a closed system. Calculate how much of the ice melts

134. MATH

Which statement is true about a triangular prism? a. It has exactly 1 pair of parallel faces b. It has not parallel edges c.It has atleast 2 pairs of parallel faces d.It has no parallel faces

135. physics

two particles of mass m1 and m2 are joined by a massless spring of spring constant k and natural length L.Initially m2 is on table and m1 is above m2 at a vertical height h.At t=0 m1 moves with velocity v0.find the position of the masses

what is the velocity of a boat traveling 60 km in 2 hours?

137. chem 122

2H2+O2=H=-121k?1molH2O how many grams of hydrogen are needed to produce 1.20x10power3 Kj of heat?

138. Physics

I need help with b... I found that k=.750880 for part a but I can't figure out what y would be to get potential energy. A 52 g mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 0.8 * sin( 3.8 * t )

139. physics

A solid sphere of radius 3 cm and mass of 100 g rolls down a 30 degree incline from a height of 1 m. A hoop of the same mass and radius rolls down the same incline from the same height. What is the linear velocity of each body at the bottom of the incline?

140. chem

An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams?

141. Physics

#1.) A solar photovoltaic panel has an area of 3 m^2. The panel's maximum power output is 595 W @ 1100 W/m^2. a) What is its efficiency? b) If the panel receives 1300 W/m^2 of irradiance, what is its new power output? #2.) A solar voltaic module has a

142. history

how does the history of cuba connect to the current problems it has today? i know that fidel castro came to power and established a communist ditatorship, but what was it before that? and i kinda need more info for the whole question, any websites would be

143. physivs

A certain CD has a playing time of 68 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude of the average angular

144. english

this is the assignment can you tell me if i covered what was needed of the assignment? Write two paragraphs, with a total minimum word count of 350 words, explaining what your point of view will be and what you plan to accomplish in your paper. My point of

145. Physics - mass of a galaxy

A star at the edge of the Andromeda galaxy appears to be orbiting the center of that galaxy at the speed of about 200km/s. The star is about g*10^9AU from the center of the galaxy. Calculate a rough estimate of the mass of the Andromeda galaxy. Earth

146. physics

A phonograph record of radius 6 cm and mass 15 g is rotating with an angular velocity of 33.33 rev/min. A Penny of mass 1 g suddenly falls on the record and lands at the radial distance of 4 cm from the record’s center. What is the angular velocity after

147. college

An essay on- To what extent was president andrew jackson one of the nation'smost effective president?

148. maths

find the value of (24-16)*8-64/(10-2)+4

149. Statistics

Suppose that a set of test scores from a class you teach is symmetric and bell-shaped. That's means that there are some scores significantly below the mean and some significantly above the mean, so that it would be inappropriate to "give everyone an 'A',"

150. physics

What is the longest wavelength for a standing wave, in the same length tube, that is open at one end and closed at the other?

151. science

My science teacher gave me a site to go to and it would do the references for me. But I forgot the site. I remember that it Had APA, Print and non print. Can someone please help me with the site address? Thank you so Much!

152. Chemistry

I am doing a report on ethylene glycol, AKA antifreeze, and I need to figure out if it is naturally occurring or if it is man-made. I can't seem to find this answer anywhere! Please help!

153. com155

Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used The role of education

154. Chemistry

One other question that I cannot figure out what I'm doing wrong is this.. If .002 L of .650 M NaOH are added to 1.0 L of 0.9 M CaCl2 what is the Q value? I keep getting 0.0011 because I thought the answer was [Cu+][OH-] but that's not correct

155. english

Hi I really would appreciate your help.I am freshman in college and I want to be "Women's health nurse pracitioner". However, English is not my native language and even though this is exactly what I am interested in I am doubting my performance in labs. I

156. statistic

the mean of adult men is 172 pounds with a standard deviation of 29 pounds. ask 20 men thier weight and use excel to calculate the mean. test the hypothesis that the mean is not 172 pounds at the .10 significance level. and how many men should be sampled

157. english (Frederick Douglass)

Why do you think Douglass says of the killing of slave Demby ‘in an instant poor Demby was no more. His mangled body sank out of sight, and blood and brains marked the water where he stood.”?

158. college Chemistry

1. If 25 grams of Iron (III) hydroxide is dissolved in a 500mL volumetric flask, what is the Molarity of the solution? 2. An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams? 3. An unknown metal,

159. physics/rollercoaster

how would an increase in mass inside of a rollercoaster affect the sturdiness of the coaster

160. algebra 2

What is 6y^2-33y-63?

161. physics

A mobile is constructed from a thin rod of mass 50 g and length 50 cm. Two hanging masses are positioned at each end of the rod. The mass of one of the hanging masses is 100 g. What must be the mass of the other hanging mass so that the mobile is in static

162. college

To what extent was president andrew jackson one of the nation'smost effective president?

163. biology

Produce a family tree for at least three generations of your family or a friend's family following these genetic traits: Eye color Hair color

164. social studies

How did imperialism lead Germany into World War I? thanks for help !

165. Department of Health and Human Services

WHAt do you think of hhs

166. US History

the earliest large cities were located on waterfronts. How might new changes in transportation affect the location of cities ?

167. marketing planning

Define and comment on the Marketing Concept. Outline and comment on the role of marketing management within the wider context of the operation of a business enterprise as a whole unit.

168. math

the measures of the angles of a quadrilateral are in the ratio of 1:2:3:4, find the measure of each angle

169. subtracting two digit numbers

bathany has 40 apples write a subtraction story about apples that would require regrouping

170. earth

the earth has a limited amount of water true or false

171. physics

One of two 207.0 kg crates is dragged across the floor at a constant speed with a horizontal force of 197.0 N. How much force would it take to drag them both across the floor if they are tied together one behind the other? How much force would it take to

172. Math

Fill in the blank so that the given statement is true. The median is 77 65,68,78,82,89,__

The interviewer wants to know why you got a "D" in all your English classes until this year, when you got a "B." Your best response is: (Points: 5) “I had problems writing and never thought it was important. Then, I realized that it is important, so I

174. 122

i need help pls to understand bohrs model

175. english

question How would you think a writer would hope to see themselves as a writer in the future? What should they still need to learn to strenghten it to make it better?

176. physics

A mobile is constructed from a thin rod of mass 50 g and length 50 cm. Two hanging masses are positioned at each end of the rod. The mass of one of the hanging masses is 100 g. What must be the mass of the other hanging mass so that the mobile is in static

177. Microeconomics

same question about the are monopolies evil?....i wanted to know if the regulators are evil?

178. Math

(x+5)(x-3)=9 I am not sure how to work this out?

179. math

a country has 221 mobile cellular telephones per 250 inhabitants. if the country's population is about 2,800 how many mobile cellular telephones does the country have? in your own words, using complete sentences solve the problem

180. calculus

A line in the first quadrant is tangent to the graph of y=1/x^2. How can we minimize the area between the line and the axes?

181. polymer science

how can we get copolymer from polymer give the reaction condition and how can its possible and the equation for the copolymerization.

182. Social Studies

What articles would you recommend for a project where I must connect politics in europe to the world?

183. chemistry

If you hit the surface of Copper with a photon of energy and find that the ejected electron has a wavelengt of .8nm what is the frequency of the incoming photon?

184. chemistry

Using the ionization energy chart, how much energy will it take to remove only 1 electron on the surface of Nickel? If you hit the surface of Nickel with a photo that has a wavelength of 90nm, what will the wavelength of that ejected electron be?

what is the metalloids of shininess

186. Chemistry

what is a common physical property of ester?

187. PHL/323

roles of key players, ethical issues involved fo the scott paper company

188. classe to learn english

i have a home woork i w'ant to writhe evrething abaout the CLOOK the big hand ,the little hand ?

189. social studies

Why did Germany want to become an empire ?

190. law & ehtics

I,m doing aresearch paper and i have to answer questions. Do i write the question in my paper or do i just put them in my intro? the question has number so do i put them in there too?

191. algebra 1

what is the solution for this equation -9/16 - 7/16 =

192. algebra 1

can you help with this one -7 - (-2)=

193. ethics

What protects whistleblowers from retaliation? What federal law or federal act stands up for them?

194. math

Multiplication of fraction 21/25*3 8/9

195. math

can anyone help

196. math

Wow there is no one is there to help here

197. Biology

Identfing the mixture soil and water

asked by General lab
198. Physics-I would like to ask once more!

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. (Figure

asked by Marco Tsang
199. science

Baceria are placed into two different areas . these area are??

200. physics

One of two 207.0 kg crates is dragged across the floor at a constant speed with a horizontal force of 197.0 N. How much force would it take to drag them both across the floor if they are tied together one behind the other? How much force would it take to

201. English

In Life of Pi, which is the true story? To me, I think the answer can go either way... Can someone help me? :S

202. chemistry

For the following strong base solution 0.40 M NaOH, determine [OH-] and [H30+]. thanks

203. Discrete Math

Let a, b, c, and d be integers, and let n be a positive integer. Prove that if a is congruent to c mod n and b is congruent to d mod n, then (a-b) is congruent to (c-d) mod n

204. discrete math

Let A= {for all m that's an element of the integers | m=3k+7 for some k that's an element of positive integers}. Prove that A is countably infiite. Note: you must define a function from Z+ to A, and then prove that the function you definied is a bijection

205. math

_4y_____ _ ___3y________ y^2+6y+5 y^2+5y+4

206. science

Does a jellyfish reflect or refract light when it gives off light. If yes, can u please include a ray diagram

207. phy

During an isovolumetric process, the pressure on the gas is doubled and the amount of gas is tripled. If the initial temperature of the gas is 300k, what is thefinal temperture.

208. chm122

how many kilojouels of heat are produced when 670gof oxygen react with sufficient hydrogen?

209. college Chemistry

After subtracting the weight of the container, the Vanadium metal inside is found to weigh 8.34 grams. After reacting with Oxygen the newly formed compound weighs 21.43 grams. What is the empirical formula?

210. science

what layer of the earth did the chile miners reach

211. science

how did the miners of chile get into the earth

212. science

how does the miners jobs help the earth

213. science

what was the chile miners looking for

214. Math

1.x(x-3)=4 means that x=4 and x-3=4 Is that right? 2.Is the sum of squares prime???

215. science

how far did the chile miners enter into the earth

216. College physics-oscillations

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume

217. Engligh 101

I need help analzying this quote. The fantastic. . . lasts only as long as a certain hesitation. . . [in deciding] whether or not what they [the reader and the protagonist] perceive derives from “reality” as it exists in the common opinion. . . If he

218. english (Frederick Douglass)

Whatis the most important description of Mr. Gore?

219. algebra

how do you figure this equation step by step 4x-3y=11 2x+3y=13

220. Com 220

I need help in how do I go about incorporating statistics, graphs and iiustrations. My topic is about probation is apporiate for drug offenders

221. the clook in english

i have a home woork i w'ant to writhe evrething abaout the CLOOK the big hand ,the little hand ?

Why is it essential to consider each domain when studying and discussing the theories of adult development? Provide an example of how one domain of development impacts the other two.

223. english

i need three strong reason to convince people to go bowling

224. English 101

What does uncanny and marvelous mean?

225. English 101

What does uncanny and marvelous mean?

226. US History

1) Why was Ralph Abernathy a reliable source for information about the civil rights movements ? 2) How might the association with Martin Luther King Jr., have affected his point of new toward those events?