One end of a thin rod is attached to a pivot, about which it can rotate without friction. Air resistance is absent. The rod has a length of 0.59 m and is uniform. It is hanging vertically straight downward. The end of the rod nearest the floor is given a

2. Math - app of sinusoial derivatives (help+check)

An oceanographer measured a set of sea waves during a storm and modelled the vertical displacement of waves in meters using the equation h(t)=0.6cos2t+0.8sint, where t is the time in seconds. a) Determine the vertical displacement of the wave when the

3. physics

a ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. what is the period of the motion?

4. math 12

Seven year-old Sarah has nine crayons; three blue, one red, two green and three yellow. a) In how many ways can she line up the crayons on her desk? b) She is to pick up some of the crayons. How many different choices of some crayons could she make?

5. Chemistry

Draw a model of a solution in which water (h2o) is the solvent and carbon dioxide gas (co2) is the solute?

6. physics

What are the magnitude and direction of the electric field at a point midway between a -7.0 µC and a +6.0 µC charge 2.5 cm apart? Assume no other charges are nearby.

7. algebra 2

a trapezoid has one equal base to its height, x, and the other base is twice as long.write the expression for the area of the trapezoid as a common fraction in terms of x.

8. Organic chemistry

In Hydration of 2-Ethyl-1-Butene which is the major product and which is the minor product? possible products are 3-methyl-3-pentsnol with a bp of 123C and 2-ethyl-1-butanol with a bp of 146C. Thank you!

9. physics help

A 1210 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. The angle between the beam and the horizontal is 30 degrees upwards and the angle between

A sledge loaded with bricks has a total mass of 18.0 kg nd is plled at constant speed of a rope incllined at 20 degres above the horizontal. The sledge moves a distance of 20.0 m on a horizontal surface. the coefficient of kinetic friction between the

11. Math

A standard number cubes with the numbers 1 through 6 is rolled. Find the probability of rolling a number greater than 2.

12. Physics

A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)

13. chemistry

Calculate te calue of Ksp for Ca(NO3)2 using the data below. Ba(aq) delta G0f= -561 kJ/mol NO3 (aq) delta G0f= -109 kJ/mol BaNO3 (s) delta G0f= -797 kJ/mol

14. chemistry

Calculate the molar solubility of MX2, if the Ksp=3.3x10^-8 i already asked this but im confused about one of the steps. Ksp = (x)(2x)^2 = 4x^3 = 3.3X10^-8 x = solubility = 0.00202M. but i don't understand do i substitute the x in 4x^3 3.3X10^-8 and then

15. math 12

In Lisa's first-year college program she must take nine courses including at least two science courses. If there are five science courses, three mathematics courses, four language courses and five business courses from which to choose, how many different

16. chemistry

Rank the relative nucleophilicity of the indicated species in ethanol. CH3COOH CH3OH CH3COO- CH3S- CH3O- THANK YOU!

17. Chemistry

The following isotopes (listed with their half-lives) have been used in the medical and biological sciences. Arrange these isotopes greatest to least decay activity. (Use the appropriate symbol to separate substances in the list.) ^3H (12.2 years) ^24Na

18. physics help

A 1210 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. The angle between the beam and the horizontal is 30 degrees upwards and the angle between

19. Physics

A barbell is mounted on a nearly frictionless axle through its center. The low-mass rod has a length d = 0.27 m, and each ball has a mass m = 0.2 kg. At this instant, there are two forces of equal magnitude F applied to the system as shown in the figure,

A ceiling fan is turned on and a net torque of 1.6 N·m is applied to the blades. The blades have a total moment of inertia of 0.25 kg·m2. What is the angular acceleration of the blades?

21. math 12

The members of City Council are to vote yes or no on each of seven issues. In marking a ballot, each councilor has the option of abstaining on as many as six of the issues, but should not abstain in all seven cases. In how many ways can the ballot be

22. math

working together 2 people can mow a large lawn in 4 hours. One person can do the job alone one hour faster than the other person. How long does it take each person working alone to mow the lawn?

23. Chemistry

A 25 mL sample of wine is found to have a concentration of acetic acid of 0.23 M. If this was titrated with a 0.16 M NaOH solution how many mL's of NaOH would be required?

24. algebra 2

An arithmetic progression has 5 terms that have a sum of 200. The sum of the last three terms added to 6 times the sum of the first two terms equals zero. What is the first term?

A 16.0 kg box is released on a 39.0° incline and accelerates down the incline at 0.267 m/s2. Find the friction force impeding its motion

26. Physics

A bar of aluminum (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 75.5°C while the opposite end is at 30.0°C. Find the temperature at the junction when the energy

27. Physics

Two spheres A and B, where A has twice the mass of B, are projected at the same horizontal velocity off the edge of two different height shelves. Sphere A leaves from a height of 2.0 m. Sphere B leaves a shelf 1.0 m off the floor. If both spheres leave the

rectangular prism: height 7 feet, width 4 feet and length 3 feet Find the volume Cylinder: radius 3.5 feet and height 7 feet Find the volume Van cargo space measures 8 feet tall by 5 feet wide by 13 feet deep. find the volume instruments will take up about

29. math

A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue? I have seen so many different answers on this site to this question and am not sure. I

30. math

Initial Investment?? Annual % Rate= 8 Time to Double?? Amount after 10 years= \$20,000 I don't know how to figure out the initial investment and the time to double help me please?

31. Chemistry

In Hydration of 2-Ethyl-1-Butene which alcohol is predominant? Thanks!!!

32. chem

balance the formula Cu(OH)2(s) + HNO3(aq) -> H2O(l) + fine the formula here(aq) i did the H20 but i don't know the other formula i thought it was CuNO3 but that's wrong and idk what to do with the extra O

33. Physics

An FM radio station broadcasts at 80.9MHz. Determine the period of the radio waves. i know period is just 1/freq. so what would i convert 80.9 MHz into???

34. math

for the sequence:1,6,11,16,...,the 50th term would be:

35. physics

A 20-lb weight is hung on an 18-in. spring stretching it 6 in. The weight is pulled down 5 in. and 5 lb are added to the weight. If the weight is now released with a downward velocity of y0 in./sec, find the position of mass relative to the equilibrium in

36. math

A carpeted living room and dining room area measures 32 ft by 10 ft. Mark decides to install wood flooring in the 12 ft by 10 ft dining room. By what percent has he reduced the area that is carpeted?

37. MATH

Rob can complete his bus route in 6 hours. Joan can complete her bus route in 3 hours. If they left the terminal at 3:00 am and after each completed route returned to the terminal, determine the next time they would leave the terminal at the same time.

38. English

In Invisible Man, the main character disproved of Tod Clifton and didn't like that he was selling sambo dolls. Why would he then make Clifton seem like a hero, and give a grand speech about him at his funeral? Was it because he wanted to impress others

39. Physics

An FM radio station broadcasts at 80.9MHz. Determine the period of the radio waves. i know period is just 1/freq. so what would i convert 80.9 MHz into???

40. physics

A diving board length = 6.00 m that weighs 210 N is supported by two pillars. One pillar is at the left end of the diving board, as shown below; the other is distance d = 1.60 m away.Find the magnitude of the force exerted by the left pillar when a 90.0 kg

41. Chemistry2

An electrochemical cell is created using gold and magnesium half-cells. a. Determine which half-cell will undergo oxidation and which will undergo reduction, identify anode and cathode, and calculate the voltage for the cell. You do not need to diagram the

42. math

You are borrowing \$90,000.00 at an annual rate of 5% for 20 years . What is the total amount you will pay ?

43. physics

A rock stuck in the tread of a 57.0 cm diameter bicycle wheel has a tangential speed of 3.00 m/s. When the brakes are applied, the rock's tangential deceleration is 1.40 m/s^2. At what time is the magnitude of the rock's acceleration equal to g?

44. Math

Write the numeral 436eight in base ten

45. Chemistry

In hydration of of 2-Ethyl-1-Butene What important bands (include wavenumbers) would begin to disappear in an IR spectrum and what important bands would begin to appear in the IR spectrum as the reaction progressed?

46. ALGEBA

A POLE IS LEANING AGANIST A TREE SO THAT THE TOP OF THE POLE IS AT A HEIGHT OF 22FT.THE BUTTON OF THE POLE IS ON THE GEOUND 6FT AWAY THE TREE.WHAT IS THE SLOPE OF THE POLE LEANING AGAINST THEE TREE

47. physics help

A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beamThe angle between the beam and the horizontal is 30 degrees upwards and the angle between the

48. Baking

I have a recipe for a Tunnel of SugarPlum cake. It calls for a small pky of frosting mix (Jiffy). This is no longer available here. I have researched other Tunnel recipes on the web. They also call for the frosting mix. HELP PLEASE. How and what can I

49. physics help

A uniform plank of length 5.1 m and weight 235 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 458 N walk on the overhanging part of the plank before

50. Physics

I've got a question: Imagine this scenario where someone releases a marble down an inclined ramp and at the end of the ramp a block is fixed. So the marble will roll down the ramp and it will collide with the block. Since the block is fixed,

51. holy name university

the pressure of a mixture of nitrogen,carbon dioxide and oxygen is 150 kPa.Wat is the partial pressure of oxygen if the partial pressures of the nitrogen and carbon dioxide are 100 kPa and 24 kPa,respectively?

52. physics

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 7.00 g at its outer end. What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end?

53. physics help

An automobile tire has a radius of 0.280 m, and its center moves forward with a linear speed of v = 18.0 m/s. (a) Determine the angular speed of the wheel. (Assume that there is no slipping of the surfaces in contact during the rolling motion.) rad/s (b)

54. spanish

"¿Piensan ver ese programa de entrevistas más tarde?" "Sí,_____ después de las noticias." a. la pensamos ver b. pensamos verlo c. las piensan ver d. lo piensas ver C?

55. Chemistry

Each of the following nuclides is known to undergo radioactive decay by production of a beta particle, ^0_-1e. Write a balanced nuclear equation for each process. (Use 'e' for an electron, 'p' for a positron, and 'n' for a neutron. Omit states-of-matter

56. algebra 2

A regular polygon has interior angles of 120 degrees. How many siddes does the polygon have?

57. math

the dimensions of a rectangular prism are height 7 feet, width 4 feet and length 3 feet find the surface area part 2: dimensions of the cylinder are height 7 feet and radius 3.5 feet solve with a decimal then round to the nearest half foot. part 3 you have

58. physics help

wo thin rectangular sheets (0.13 m 0.52 m) are identical. In the first sheet the axis of rotation lies along the 0.13 m side, and in the second it lies along the 0.52 m side. The same torque is applied to each sheet. The first sheet, starting from rest,

59. math

im working with integers. a running back rushed for 129 yards through 3 quarters.in the 4th quarter the running back lost 5 yards per rush. the runing back rushed 5 times in the 4th quarter. 1) how many yards did the running back complete in the 4th

60. English

Thank you very much for your help. Here are the last sentences of the day. 1)The opposition between dark and white works in reverse. 2)The poet teaches men how to understand themselves better. The subject (matter?) of poetry is often a normal (common) man

61. Physics

A weight stretches one spring 3 in. and a second weight stretches another spring 9 in. If both weights are simultaneously pulled down 1 in. below their respective equilibrium positions and then released, find the first time after t = 0 when their

62. English

I need to find some fallacies in the Martin Luther King Jr. speech.. "I Have A Dream" I am happy to join with you today in what will go down in history as the greatest demonstration for freedom in the history of our nation. Five score years ago, a great

63. physics

in pl spectrum what is the red shift and blue shift and also give the interpretaion

64. English

Can you pleae tell me which alternatives are possible? Thank you very much. 1, They believed a person (better: the individual) should be free from external rules. 2.The Romanics exalted the individual as the centre of life and art.This led to the view of

65. Math

Bert has a bag with 12 blue marbles, 6 green marbles, 8 purple marbles, and 4 red marbles. If he want the probability of picking a blue marble to be 1/2 what should he do?

66. algebra

The formula t(n+1)over 2 will determine a triangular number, where n is a natural number. For what value of n will the triangular number 325 be found?

67. Eccpmonics

What % of Americans have a net worth of \$750,000?

68. physics

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 7.00 g at its outer end. What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end?

69. home economics

S and J are trying to split 100 dollars. In bargaining round 1, S makes an offer at cost 0, proposing to keep S1 for himself and J either accepts (ending the game) or rejects. In round 2, J makes an offer at cost 10 of S2 for S and S either accepts or

70. Physics

A delivery truck travels 18 blocks north, 25 blocks west and 17 blocks south. What is its final displacement from the origin? Assume the blocks are equal length.

71. College Math

Find the vertex and axis of symmetry of the graph of a function. f(x)=x^2+6x+16

What are some negative facts for the Montane Cordillera. Also I am looking for some positive and negative facts for the Prairie Ecozone and Mixed Wood Plain ecozone. Need help please thank you!

73. physics-frictional torque

A string that passes over a pulley has a 0.321 kg mass attached to one end and a 0.655 kg mass attached to the other end. The pulley, which is a disk of radius 9.50 cm, has friction in its axle. What is the magnitude of the frictional torque that must be

74. cal 1

Find the area of the indicated region f(x)=(4-x^2) between(0,2)with 4 equal subintervals (left endpoints)

75. math

How would you describe the shape that the word represents?

76. algebra

If f(x)=g(g(x))-g(x) and g(x)=2x-1, find f(3).

77. Chemistry

Hi everyone!!! Can someone please tell me the answer to the following questions? Thank you so much!!!! In Hydration of 2-Ethyl-1-Butene 1. What was the purpose of using NaBH4 in 3 M NaOH? 2. What was the purpose of using diethyl ether in the extractions?

78. english

write two paragraphs how interest rates affect our purchasing decisions underlining the topic in each paragraph

79. chemistry

The electrochemical cell described by the cell notation has an Eo of -0.37 V. Calculate the maximum electrical work (kJ) the cell has done if 331.73 g of Cu(s) (Molar Mass - 63.55 g/mol) reacts. Round your answer to 3 significant figures. Cu(s) l Cu+(aq)

80. math

I need to enclose a section that is 250 square ft with a fence that cost \$1.50 per yard, what dimension would i use to minimize the cost?

81. Science

What roadblocks might you face, working outside the science community?

82. college, teaching

Many programs that prepare teachers and paraprofessionals for their new career require students to create a professional portfolio as a record of their professional development. Use Appendix A to help you create a Professional Development Plan—a

83. math

Suppose that a market research company finds that at a price of p=\$25, they would sell x= 53 tiles each month. If they lower the price to p=\$15, then more people will purchase the tile, and they can expect to sell x = 63 tiles month’s time. Find the

84. social studies

the french and idian war was a deadly war but important. is this a good thesis statement?

85. Game Theory

I have a question on a fixed cost of bargaining problem. Can somebody help me?

86. statistics

SAT scores are normally distributed with a mean of 1518 and a standard deviation of 325. What scores correspond to P20 and P65?

87. Economics

S and J are trying to split 100 dollars. In bargaining round 1, S makes an offer at cost 0, proposing to keep S1 for himself and J either accepts (ending the game) or rejects. In round 2, J makes an offer at cost 10 of S2 for S and S either accepts or

88. math

S and J are trying to split 100 dollars. In bargaining round 1, S makes an offer at cost 0, proposing to keep S1 for himself and J either accepts (ending the game) or rejects. In round 2, J makes an offer at cost 10 of S2 for S and S either accepts or

89. Med lab tech

how many grams of KCL are required to make 5.0ml of a 35% w/v solution?

90. English

Thank you very much for your corrections. Can you help me check these ones, too? 1)The poet had to show other people the truth of real emotions. To manage this task (to achieve this goal?), the poet had to use imagination, purifying (?) human emotions and

91. math

a running back rushed for 129 yards through 3 quarters.in the 4th quarter the running back lost 5 yards per rush. the runing back rushed 5 times in the 4th quarter. 2) how many total yards did the running back have after the 4th quarter? show work

92. chemistry

For which of the following will delta S be the most positve? A) Co2(g)->CO2(s) B) C6H12O6 (s)+ 6 O2(g) -> 6 Co2(g) + 6H20(g) C) Na(aq) + Cl (aq)-> NaCl (s) D) Cl2(g) + H2(g) -> 2HCl(g) E) H(aq) + OH(aq) -> H20 (l)

93. algebra 2

three numbers in the ratio of 7:3:2 have a sum of 228. what is the difference between the smallest and the largest numbers?

94. algebra 2

how many 7-digit phone numbers are possible if the first digit must be non-zero? answer in scientific notation.

95. Chemistry!!!

3. Imagine that more than one band appeared in the GC chromatogram, but you were unable to run the standards. Instead you took the RI and corrected it to 20 oC (1.4205). RI can be used to determine the exact mole percentage of an isomeric mixture.

96. math

i need to enclose a 250 square ft section with a fence that cost \$1.50 per yard what dimensions would I use to minimize the cost?

97. microeconomics

In order to maximize profits or minimize losses, a competitive firm will produce at the point where MC = MR. Do you agree or disagree with this statement? * i am thinking that i would agree because firms have to reach a equilibrium to off set the losses

98. chemistry

i am doing problems for chemistry class, and some of them are Calculating square root/ Cube Root but some are 4 and 5 instead of 2 or 3. if in a problem the exponent is 4 or 5 how would i use my calculator to calculate the root?

Explain the Difference during the Roman Empire on what Augustus says about himself and what Tacitus says about Augustus

100. Chemistry

in Synthesis of para-Methylacetanilide What was the purpose of the sodium acetate solution

101. spanish

"Quién hace tu cama?" "Pues, yo ____." a. no hago nada b. lo hago c. la hago d. me gusta hacer D?

102. English

I still have a few more sentences to check.I hope you can look at them, too. Thank you 1) During the industrial revolution England is interested by a rise in population which caused a growing need for clothes. This led to an increase in production made

103. math

There are a total of 50 houses with two floor plans. use x to repre4sent floor plan 1 and y to represent flor plan 2 write an equation. The second floor plan has 4 times as many homes than the firs pla. Write an equation to illustrate this situation using

104. bpa 140

In health care, can you name some specific examples of how the function of control is implemented?

105. math

8. An oceanographic research vessel comes across a volcano under the sea. The top of the volcano is 300 ft below the surface and the sea floor is -7,200 ft. What is the height of the volcano?

106. Algebra/ A.S.A.P

Need help. I want to cut an extremely long problem that I just solved however I am trying to find out how -1.9 = -0.02t equals T= 93.0??? I tried dividing, multiplying and subtracting -1.9 and 0.02 together. 93.0 as the final answer was also rounded to the

107. math

A lottery game has balls numbered 1 through 15. If a ball is selected at random, what is the probability of selecting a ball showing an even number or the number 12? I thought the answer would be 7 even numbers and 1 for the 12 which would be 8/15 is not

108. Math

How do you find the value of x for a regular pentagon with its sides extended. The only information that they give is X to the 6th power inside of the circle at the top of the pentagon with an extended side.

109. Polynomials

History of Polynomials. I need to know how polynomials was created. I search for it on google but I can't find the right one.

110. algerbra

Use the graph, showing the yearly food costs of a family. What was the decrease in the cost of food from 2003 to 2004?

111. math

find all points on the hyperbola y=1/x, that are closest to the origin on (1/2,2)

112. math

a running back rushed for 129 yards through 3 quarters.in the 4th quarter the running back lost 5 yards per rush. the runing back rushed 5 times in the 4th quarter. 3) imagine that instead of losing yardage on each rush in the 4th quarter, the running back

113. calculus

1. e^ln3 - 2lnx 2. 2(lnx)^2 + lnx - 1 =0 3. d/dx (e^x . e^e^x)

114. Science

If you thought you had discovered a new element, how could you get the scientific world to accept your discovery?

115. Big Ideas in Science

If you thought you had discovered a new element, how could you get the scientific world to accept your discovery? What roadblocks might you face, working outside the science community? How could you avoid being labeled a "crackpot"?

116. maths

what is the empirical formula of a compound containing C(60%), H( 4.44)

117. college economics

What variables other than price and advertising are likely to affect the quantity demanded of a product?

118. physics

Lazydog and his tractor (1330 kg) are pulling a trailer (530 kg) up a 7° hill. The trailer wheels roll freely. What is the magnitude of the force in the coupling between the tractor and trailer when their velocity is 8.7 m/s up the hill and they are

119. Chemistry

in Synthesis of para-Methylacetanilide What important bands (include chemical shifts) would begin to disappear in a H-1 NMR spectrum and what important bands would begin to appear in the H-1 NMR spectrum as the reaction progressed?

120. Chemistry

How many moles are in 1.64 g hclo

122. College Algebra

Solve 1/3logP-2logt +2/3logr by condensing it to one

what is P if R =37% and B= 300?

124. physics

When a woman runs 140 meters north and then 60 meters west, what is the magnitude of her total displacement?

125. science

how does an ice cube melt

126. chesmistry

about how many skittlesium nuclei would remain after three half lives if the intial sample had 500 skittles?

I am doing a project on three ecozones of canada. The three which I have picked are Montane Cordillera, Praire and Mixwood plains. I am trying to find some info on their cultual and recreational activities. Does anyone know of some great websites. Thanks

128. social studies

Boston Masscure

129. science

what is the standard for measuring volumes of fluids

130. spanish

"¿Tienes que reciclar _____ en tu comunidad?" "Sí, lo tengo que reciclar." a. el cartón b. las latas c. las botellas de plástico d. los periódicos A?

I am looking for any information on the culture of the mixedwood plains.