# Questions Asked onOctober 21, 2013

1. ## Science help! URGENT. Check answers

1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity ← rolling friction sliding friction air resistance 3. A

1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity ← rolling friction sliding friction air resistance 3. A

3. ## Vocabulary skills

How do you respond when your parents deny you permission to do something? For example, if you want to travel and work around the country for the summer, but your parents say you’re too young, do you become furious and angrily demand that they stop

4. ## poetry

Scan the following lines from Lowell's poem to identify the spondee. By placing the accent mark (') over stressed syllables and the (-) over the unstressed syllables. Who loved his charge but never loved to lead' One whose meek flock the people loved to

5. ## college physics

One athlete in a race runnng on a long, straight track with a constanct speed v1 is a distance d behind a second athlete running with a constant speed v2. (a) Under what circumstances is the first athlete able to overtake the second athlete? (Use v_1 for

6. ## Chemistry

How much heat, in kilojoules (kJ), is required to raise the temperature of 2.50kg Hg(l) from -20.0 to -6.0C? Assume a density of 13.6g/ml and a molar heat capacity of 28.0 J mol -1 C -1 for Hg(l). Please helpppppp .... thanks in advance

7. ## Calculus

If C(x) = 18000 + 400x − 2.2x^2 + 0.004x^3 is the cost function and p(x) = 2800 − 7x is the demand function, find the production level that will maximize profit. (Hint: If the profit is maximized, then the marginal revenue equals the marginal cost.)

8. ## Chemistry

When 1.00 kg lead (specific heat = 0.13 J g -1 C -) at 100.0 C is added to a quantity of water at 28.5C, the final temperature of the lead-water mixture is 35.2 C. What is the mass of water present?

9. ## CHEMISTRY

The concentration of Pb2+ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluble lead (II) carbonate (267.2092 g/mol) according to

10. ## algebra

simplify the number using the imaginary unit i. √-16

11. ## chemistry

If 2.0 Grams of anhydrous sodium sulfate are mixed with 2.0 grams of calcium chloride dihydrate and 2.0 grams of calcium sulfate dihydrate are collected, what is the percent yield? DO NOT ROUND A NUMBER IF USED IN A SUBSEQUENT CALCULATION

12. ## Calculus

If C(x) = 18000 + 400x − 2.2x^2 + 0.004x^3 is the cost function and p(x) = 2800 − 7x is the demand function, find the production level that will maximize profit. (Hint: If the profit is maximized, then the marginal revenue equals the marginal cost.)

13. ## Science

Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil? I need some ideas for answering this question.

14. ## math

the cost of 5 similar digital cameras and 3 similar video cameras is \$3213 each video camera costs 4 times as much as each digital camera. john buys a digital camera and a video camera. how much does he pay?

15. ## Science

Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil? I need some ideas for answering this question.

16. ## CHEMISTRY

The concentration of Pb2+ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluble lead (II) carbonate (267.2092 g/mol) according to

17. ## math

Estimate the product by finding two numbers the exact answer is between. 3x558

"Everyone in our neighborhood mows their lawn on Saturday, and my street, as a result of that, is pretty." This construction: has one error, a pronoun with no appropriate antecedent. has two errors, a pronoun with no appropriate antecedent and a shift in

19. ## Alegebra

Eleven less than 5 times a number is 24.

20. ## Geography (Ms. Sue)

1). If population were the only consideration, what cities would you select for the location of a new football team? A new basketball team? A new baseball team? 2). Why are there so few team located in the Rocky Mountain and Great Plains states? 3). Some

21. ## Physics

A disc has charge distribution sigma and radius R . What is the Electric Field in N/C at a point P , located a distance x directly above the center of the disc?Write your answer in terms of sigma, R ,x , k, and pi (type "pi"). Indicate multiplication with

22. ## English

When the United States voted in 1845 to annex Texas as the 28th state, Mexico A.)agreed to move its border to accommodate U.S. need B.)broke off diplomatic relations *C.)moved troops into Texas Thank you.

23. ## Personal fitness

2._____ training must target the muscle group that is needed for the activity you are training for. the best way to train your body to be able to do more push ups is to do push ups. (1 point) muscular endurance. cardio strength. aerobic. speed.

24. ## math

11. In the fiscal year of 1991-1992, a total of 109,782 child labor permits were issued, 2/3 of which were for males. The monthly average for males was closest to (A) 3659 (B) 6099 (C) 6861 (D) 9149

25. ## Math - Limits/Derivatives

The demand x is the number of items that can be sold at a price of \$p. For x = p^3 - 4p + 400, find the rate of change of p with respect to x by differentiating implicitly.

26. ## PHYSICS HELP!!!

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

27. ## CHEMISTRY

The concentration of Pb2+ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluble lead (II) carbonate (267.2092 g/mol) according to

"Martha, Gates, and Zuggy lifted the piano onto the bed of the truck and Kate tied the legs to the frame with ropes and grounding cable and I watched from the sofa." This statement: includes an inappropriate combination of modifier and noun. includes a

29. ## physics

1.what is the final velocity of a hoop that rolls with out slipping down a 3.00m high hill starting at rest? 2. a 1.80 m radius playground merry go round (disk = 1/2 m r^2) hass a mass of 120 kg and is rotating with an angular velocity of .600 rev/s. what

"After I had laid in the sun for two hours each day for two weeks, however; I was finished with the idea of looking like her." This statement: has one error: a verb in the wrong form. has two errors, a pronoun with no appropriate antecedent and a verb in

"The study will be conducted with all haste by the Office of Public Mendacity; nevertheless, the Office will fail to blame the culpable." This statement: includes a shift in tense. *** includes a passive construction-one in which the subject receives the

32. ## math

Mandy has collected 4 times as many seashells as Jackson. Mandy has 36 shells. How many seashells does Jackson have?

33. ## World History

Even though Robespierre was not a defender of women's equality in France, how are his and Etta Pal d'Aelders's arguments similar? When might Sieyes claim that women would be eligible for the equal rights that Etta Palm d'Aelders states that they rightfully

"Dr. Smith had argued that the cure for insomnia could be found in the seeds of apples, and although it was not true, he had made money giving lectures." This statement: *** includes a shift in tense. is a sentence fragment. includes an inappropriate use

35. ## Statistics

During September, the average temp of laurel lake is 64.2 degrees. the standard deviation is 3.2 degrees. Assume the variable is normally distributed. For the randomly selected day, find the probability that the temp will be a. above 62 degrees b. below 67

36. ## physics

Olaf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400kg that is traveling horizontally at 11.5m/s . Olaf's

"When they came to our house to visit, although they had never met either of us before, the governor and his wife were nice to my sister and I." This statement: (Points : 1) includes an inappropriate use of a comma. includes a lack of agreement between

38. ## URGENT ALGEBRA

The formula for the circumference of a circle is C = 2(pi)r , where r is the radius of the circle. What is the formula when solved for r?

39. ## algebra

At a local gym, there is an initial fee of \$59.95 to join the gym and a monthly membership fee. Sam and Maria both joined the gym. Their combined cost for 12 months was \$1319.90. How much is the monthly fee?

"Our dog LuLu had broken her leash, and rounding the corner of the house, the shrub caught her in the eye." This statement: includes an inappropriate combination of modifier and noun. *** includes a passive construction-one in which the subject receives

41. ## math

You need 2b cups of flour for making b loaves of bread. You have 8 cups of flour. Do you have enough for 5 loavesof bread

42. ## English

"Going to Cedar Point, fields of soy beans all around, in the seat of the car, Joyce riding, and Sue, together." This construction: has a subject and predicate that do not agree in number. *** is a sentence fragment. includes a pronoun that has no

43. ## Stats

A car rental agency currently has 43 cars available, 27 of which have a GPS navigation system. Two cars are selected at random from these 43 cars. Find the probability that both of these cars have GPS navigation systems. Round to four decimal places.

44. ## Biology

In mitosis, if a cell has 4 chromosomes in prophase, how many chromosomes will this cell have in metaphase? a. 64 b. 32 c. 16 d. 8 e. 4 If a cell has 20 chromosomes in G1, how many chromatids will be present during prophase? a. 30 b. 20 c. 5 d. 40 Which of

"Wondering what to do to avoid punishment and humiliation, now that she was fully alert; Judy took the eggs out of the carton, broke them into the skillet, stirred them with a fork, and cried." This construction: includes a comma splice. includes a lack of

46. ## chemistry

A tuning fork produces a sound of musical note middle C. It moves back and forth 256 time each second. what is the frequency of the tuning fork?

47. ## mah

a sewing box is 24cm by 18cm by 9cm. it is to be completely covered with silk material. what is the total surface to be covered?

48. ## Algebra

The difference between 5 times a number and 4 is 16.

49. ## Math- Urgent

2e= 4e-16 What does e equal? Please show all work.

50. ## Math

Theo is constructing a miniature putting green in his backyard. He wants it to be similar to a putting green at the local golf course, but one third the size. The area of the putting green at the golf course is 1,134 square feet. What will be the area of

51. ## Physics Classical Mechanics

A bungee jumper jumps (with no initial speed) from a tall bridge attached to a light elastic cord (bungee cord) of unstretched length L. The cord first straightens and then extends as the jumper falls. This prevents her from hitting the water! Suppose that

52. ## math >.<

for your birthday party, you make a map to your house on a 3-inch-wide by 5-inch-long index card.what will be the perimeter of your map if you use a copier to enlarge it so it is 8 inches long? Please explain!:(

53. ## Statistics

The average teacher's salary in North Dakota is \$41,027. Assume a normal distribution with standard deviation of \$5200. A. what is the probability that a randomly selected teachers salary is less than 40,000? B. What is the probability that the mean for a

54. ## math

Mrs. daniels pays \$324 for a handbag and 3 pairs of shoes. the handbag costs half as much as the 3 pairs of shoes combined. find the cost of the handbang.

55. ## PHYSICS

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is

56. ## physics

a motor car accelerate for 10sec to attain a velocity for 20msec it comtinue with uniform velocity for a further 20sec and then disccelerate so that it stop in 20sec,calculate.(1)acceleration,(2)deceleration

57. ## Calculus

y = tan^-1(sqrt(5x^2-1)) find dy/dx

20. Which one of the following passages best suggests an indirect cause? A. Because the cold front arrived, it snowed. B. Jack slew the giant because he sold the cow for magic beans. C. If you mix pleasure and business, business suffers. D. We've learned

59. ## World History

Who were the patricians and plebeians and why were they in conflict with each other?

60. ## Algebra

The total cost of a suit and 4 ties is \$292. The suit cost \$200. Each tie cost the same amount. Find the cost is one tie.

61. ## math

Omaha, Nebraska, and Sioux City, Iowa, are 90 miles apart. If the distance on the map is 1 1/2 inches, find the scale of the map.

"In Shakespeare's Romeo and Juliet, Juliet's mother rejected her, because of the power of Lord Capulet, and Juliet rejects the Nurse in the same scene, calling her a 'wicked fiend.'" This statement: has a subject and predicate that don't agree in number.

63. ## Physics

A ball whirls around in a vertical circle at the end of a string. The other end of the string is fixed at the center of the circle. Assume that the total energy of the ball-Earth system remains constant. (a) What is the tension in the string at the bottom?

64. ## Chemistry

What kind of reaction is this (redox, precipitation, acid-base, or complex ion formation reaction)? 1. 3 Ca(s) + 2 Al^3+(aq) -> 3 Ca^2+(aq) + 2 Al(s) 2. LiHCO3(s) + heat -> Li2CO3(s) + CO2(g) + H2O(g) Complete the reaction: Ni(s) + 2 Na^+(aq) -> ?

65. ## Geography (Ms. Sue)

1). If population were the only consideration, what cities would you select for the location of a new football team? A new basketball team? A new baseball team? A: ? 2). Some of the cities seem to have a population that is too small to support a team. What

66. ## Algebra

The quotient of a number and -9 increased by 10 is 11.

67. ## ALGEBRA HELP

When solving the equation, what property was used to go from step 3 to step 4? Step 1: -(2x+3= x-18 Step 2: -2x-3=x-18 Step 3: -3=3x-18 Step 4: 15=3x A)APOE B)SPOE C)MPOE D)DPOE

68. ## World History

Why were the etruscans considered to be the greatest influence on early rome?

69. ## chem 1211

P2 +3H2=2ph3 How many grams of ph3 can be formed when 37.5 grams of p2 and 83 L of h2 gas are reacted at 1 atm and 273.25 K? I really need a step by step of this problem. Thanks in advance!

70. ## algebra

In a computer game, there are four levels. At the end of each level, a player gets three times as many points as he does in the previous level. At the end of finishing the fourth level, a player gets 5400 points. How many points did the player get at the

71. ## AP Macroeconomics

3. You buy a certificate of deposit (CD) that pays a nominal rate of 12% annually. You have a tax rate of 25%, so if the interest on this CD is taxable (which it may not be) your after-tax nominal rate is (1 ñ 25%) • 12% = 9%. Since 10% equals .1, we

72. ## Physics

A juggler throws a ball straight up into the air and it takes 2.80 seconds to reach its peak. How many seconds will it take after that to fall back into his hand? Assume he throws and catches the ball at the same height.

73. ## english

Locate the complete gerund or infinitive phrase and identify its noun use. "Her motive was to keep peace in the family."

A disc has charge distribution sigma and radius R . What is the Electric Field in N/C at a point P , located a distance x directly above the center of the disc?Write your answer in terms of sigma, R ,x , k, and pi (type "pi"). Indicate multiplication with

75. ## edu 650

The idea of Gardener’s theory of multiple intelligences suggests that there are specific intelligences that are inherent in all individuals. The author, however, suggests that a preferred style may not necessarily be the best way an individual learns.

76. ## physics

a particle of mass m moves in a x-y plane. The coordinates of the particle at any instant are given by x = acos(wt) and y = bsin(wt). where a,b,w, are constant. Determine the angular momentum of the particle with respect to the origin of the coordinate

77. ## MATH

Suppose 10,000 is invested at 6 percent.how much additional money must be invested at 8 percent to produce a yield on the entire amount invested of 7.2 percent. ( Please show each and every steps of this math with the rough works) THANK YOU SO MUCH.

78. ## Computer hardware

What circumstance would be the only reason for one to toil with processor and system bus frequencies? A. Purchasing a multi core processor B. Purchasing a chip with static ram C. Overclocking a processor D. Purchasing an AMD chipset I think it's c, but I

79. ## math

Felicia paid \$125 to join tennis club. paid \$5 every time she used the court write an equation that describes Felicia's total cost for playing tennis as a function of the number of times she plays. let c =the total cost and let n = the number of times she

80. ## Math HELP

When a Superball bounces it is claimed that the height of any bounce is 90% of the height of the last bounce. If a Superball is dropped out of a second story window at the height of 200 feet. On which bounce would it bounce just one foot?

81. ## Physics

A skier skis from rest from a vertical height h1 = 19.1 m over two successively lower hills of vertical heights h2 = 15 m and h3 = 5.2 m. (Fig. 7-30). The summit of the third hill fits a circle of radius h3 centered at height 0 m. Friction with the snow

Craig is making a model version of his neighborhood that uses model trains. The ratio of the model train to the actual train is 1:64. His neighborhood covers an area o 200,704 squared feet. What will the area of the model neighborhood be?

83. ## Science, Chemistry

A cylinder containing 11.0L of helium gas at a pressure of 165atm is to be used to fill birthday balloons to a volume of 2.50L per balloon and at a pressure of 1.10atm. What is the maximum number of balloons that can be inflated at a constant temperature?

84. ## chemistry

n an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?

85. ## Math (Ms.Sue)

A company wants to reduce the size of its logo by one fourth to use on the business cards.if the area o the original logo is 4 square inches what is the area of the logo that will be used on the business cards? PLEASE help!!

86. ## math`

mr. jacob is 55 years old and tony is 7 years old. in how many years will mr. jacobs be 4 times as old as tony?

87. ## math

three times as many children as adults attended a concert on saturday. an adult ticket cost \$7 and a child ticket cost \$3. the theater collected a total of \$6000. how many people bought tickets?

88. ## MATHS

In 2006, the digits in Perry's age were the same as the digits in Laura's age, but in reverse order. In 2005, Perry was twice Laura's age. What is the difference between Perry's and Laura's ages?

89. ## Math...again

Two circles have circumferences of π and 3π. What is the ratio of the area of the circles? the diameters? the radii?

90. ## World History (last one promise)

Name three famous roman writers. Name their works and explain why these works are important. :-)

Two rectangular pieces of wood are similar. The ratio of the perimeters of the two pieces is 2 : 3. If the area of the smaller piece is 12 square inches, what is the area of the larger piece?

92. ## English

1. Which of the following is not a type of folktale? (1 point) A. cautionary tale B. mystery** C. legend D. myth Read the following sentence: Some friends from my dance class went to the museum's ballet exhibit. Which of the following is an adjectival

93. ## Chemistry

The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179E-18/n2 J where n is the quantum number that specifies the energy level. What is the frequency in Hz of the radiation emitted when an electron falls

94. ## Physics

Three negative charges with charge -q occupy the vertices of an equilateral triangle with sides of length L What is the magnitude of the electric field in units of k*q/L^2 at the center of the triangle? Give a numerical answer that is the number that would

95. ## World History.. again :x

Name new ideas in technology that occurred during the Greco-Roman time?

96. ## Alegra

Five less than the product of -3 and a number is -2.

97. ## Math...anyone?

Two circles have circumferences of π and 3π. What is the ratio of the area of the circles? the diameters? the radii?

98. ## Water Treatment

a)What would be the advantage of placing softening before cascade aeration? (Only one answer can be correct). Low oxygen concentration /Less pumping phases /High ammonium concentration /Less carbondioxide removal during cascade aeration b) What would be

99. ## math

cos2x-sinx=0. Factor and solve for sinx

100. ## U.S. History

I have to have an introductory paragraph with thesis statement and a good tone is this good? John D. Rockefeller, Andrew Carnegie, Cornelius Vanderbilt, were all big business leaders in the 19th century. But many people questioned whether America should

101. ## Math

cameron is making bead necklaces. he has 90 green beads and 108 blue beads. what's the greatest number of identical necklace he can make if he wants to use all the beads

102. ## Physics Classical Mechanics

Consider a double star system under the influence of the gravitational force between the stars. Star 1 has mass m1 = 2.32 × 10^31 kg and Star 2 has mass m2 = 1.76 × 10^31 kg. Assume that each star undergoes uniform circular motion about the center of

103. ## Physics

A 5 kg ball rolls down a 10meter long slope. Ignoring friction, how fast will the ball be rolling when it reaches the bottom?

104. ## Natural science

I want a balanced chemical equation for iron+oxygen=iron oxide please

105. ## Algebra

Ozark furniture company can obtain at most 3000 board feet of maple lumber for making its classic and modern maple rocking chairs. A classic maple rocker requires 15 board feet of maple and a modern rocker requires 12 board feet of maple. write an

106. ## Geography Report (Ms. Sue)

This is what I have written for the conclusion paragraph so far. "Therefore, to summarize this report, the city of Chicago, located in northeastern Illinois in the Great Lakes Region, has become a highly industrialized city, possessing a large population

107. ## algebra

Andrew is making a plan to complete a class math assignment. He has 48 problems to complete over 5 days. He decides to complete the assignment is such a way that his total number of completed problems doubles every day. He realizes that that number must be

108. ## math

1. What is the product of (5.1 × 10^3) • (3.2 × 10^3)? (1 point) 16.32 × 10^6 1.632 × 10^7 16.32 × 10^9 1.632 × 10^10 2. What is the product of (7.28 × 10^-2) • (9.1 × 10^-2)? (1 point) 6.6248 × 10^-3 66.248 × 10^-4 6.6248 × 10^4 66.248 ×

109. ## Physics

Superman rushes to save Lois Lane, who has fallen (has been pushed?) from a window 120 m above a crowded street. Superman swoops down in the nick of time, arriving when Lois is 2.0 m above the street and stopping her just at ground level. Lois has a mass

110. ## physics

a projectile with mass (m)=35grams is placed on a vertically positioned spring. the spring constant (k)=6500N/m. the projectile is launched straight up into the air by compressing the spring a distance (x)=8cm.How high does the projectile go?

111. ## chemistry

a tuning fork produces a sound of musical note middle C. It moves back and forth 256 time each second. What is the frequency of the tuning fork?

112. ## chemistry

When a photon of light hits the surface of a metal, a photoelectron may be emitted. Some of the photon's energy is required to free the electron from the surface. The remaining energy becomes the kinetic energy of the photoelectron. The minimum energy for

113. ## World History

Who was Hannibal? What happened to him? Why was he important?

114. ## Math

Jim ate 3/8 of pie and Jung ate 0.25 of the same pie. Shade the amounte that Jim and Jung ate. Who ate more pie?

115. ## Finance

The U.S. financial system is composed of: (1) policy makers, (2) a monetary system, (3) financial institutions, and (4) financial markets. Indicate which of these components is associated with each of the following roles

116. ## Physics

An oxygen cylinder of volume 7 cubic metre has oxygen pressure 150 kg/cm^2. In OPEN state, the nozzle has diameter 1 cm. How much time is required for pressure to come down to 4 kg/cm^2 if nozzle is opened?

117. ## Quantum Physics

Recall how the Schrödinger equation was motivated by the non-relativistic dispersion relation E=p22m. If we follow the same procedure for the case of a relativistic dispersion relation (E2=p2c2+m2c4), what equation do we arrive at? (For simplicity

118. ## ALGEBRA HELP

The perimeter of a rectangle is 60cm. The length (L) of the rectangle can be represented by (2x-7). What are the dimensions? A) length=10 width=14 B) length=6 width=18 C) length=9 width=15 D) length=10 width=1 or 15

119. ## Law Plzzz help!!!

After graduating grade 12 what are the steps one should take to become a lawyer i know that one needs a bachelors degree and a law degree but what are steps before and after that to achieve that certain point of being a lawyer. PLEASE EXPLAIN!!!

120. ## History

Will you please check my answers? 1. Which of the following is an example of new economic divisions in the European peasantry that began to occur during the fifteenth century? A. Peasants throughout Europe became poorer. B. Peasants living in the Balkans

121. ## Algebra

Fifteen more than twice a number is -23

122. ## Math

Combine the three simple statements below in a compound sentence of the form . That is, provide a written statement in which you translate this symbolic statement to English. p: the ball is lost q: he will drink wine r: the boy rides the bike

123. ## Physics

An airplane at 410 miles per hour at 40 degrees east of south is blown off course by a wind of 50 miles per hour at 25 degrees east of south. Find the resultant speed of the airplane.

124. ## Biology

Your thermocycler is broken, and can only reach a temperature of 72 degrees Celsius maximum. What effect will this have on your PRC? Will you still get DNA replicated? Explain

125. ## math

Solve for z in z + 8 + 20/z = 0. Answer in a+bi form.

126. ## physics

On earth, two parts of a space probe weigh 19200 N and 4130 N. These parts are separated by a center-to-center distance of 6.38 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the

127. ## Physics

One can work out by either lifting weights or using a tension band, which is like a big rubber band. If we model the rubber band as a big spring with spring constant 400 N/M how far in meters must I stretch the the band so it applies a force equivalent to

128. ## Physics Classical Mechanics

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

129. ## water

When water temperature is 10 °C, calculate the saturation concentration for oxygen (at atmospheric pressure).

A small sphere of mass m and charge +q with zero velocity falls under the influence of gravity (acceleration = g from height h onto an infinite uniformly charged plane with positive charge density sigma as shown below. What will the velocity of the sphere

131. ## Calculus

Find the limit: as x approaches 0 lim((5/x)-(5/sin(x))

132. ## physics

A 3.0-kg sphere with a radius of 6.0 cm rolls from rest without slipping 4.0 m down an incline, reaching a speed of 7.0 m/s after rolling for 5.0 s. What is the torque that the friction interaction between the sphere and the incline exerts on the sphere?

133. ## Geography Report (Ms. Sue)

This is what I have written so far. Do you suggest any improvements? Location: Chicago's absolute location is about 42 degrees North latitude and 87 degrees West longitude. It is located upon the southwestern shore of Lake Michigan in the northeastern part

134. ## Quantum Physics

The variance σ2X=⟨(X^−⟨X^⟩)2⟩ of an operator, X^, is a measure of how large a range its possible values are spread over (the standard deviation is given by σ=σ2−−√). Suppose that |X⟩ is an eigenstate of some operator X^, what is the

135. ## algebra 2

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS).

136. ## physics

An electron floats at rest above a sheet of charge with uniform charge density x. What is x in C/m^2

137. ## Physics Classical Mechanics

A planet has a single moon that is solely influenced by the gravitational interaction between the two bodies. We will assume that the moon is moving in a circular orbit around the planet and that the moon travels with a constant speed in that orbit. The

138. ## English

I was hoping someone could check my answers? We are supposed to underline the nouns in the following sentences. 1. Remove the pencils, papers, and rulers from your desk.(pencils, papers, rulers, desk) 2. Our total bill for the delightful lunch was twelve

139. ## Math

How do you divide power property with exponents?

140. ## Chemistry

The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the electromagnetic radiation absorbed

A small sphere of mass m and charge +q with zero velocity falls under the influence of gravity (acceleration = g from height h onto an infinite uniformly charged plane with positive charge density sigma as shown below. What will the velocity of the sphere

142. ## math

Simplify the expression. (x − 3)(2x − 4) − (x + 2)(x − 6)=

143. ## algebra

A pipe manufacturer makes pipes of four different sizes. The diameter of each pipe is two times the diameter of the pipe of the next smaller size. The diameter of the biggest pipe is 16 centimeters. What is the diameter of the pipe of the smallest size?

144. ## AP Macroeconomics

I need help!!! I don't understand this at all, and neither does my history teacher. Please help explain it in a simpler way if possible. Thank you!!!! question: which of these is not a component of the interest rate on a 30 year us government bond? A.)

145. ## Physics

A small sphere of mass m and charge +q with zero velocity falls under the influence of gravity (acceleration = g from height h onto an infinite uniformly charged plane with positive charge density sigma as shown below. What will the velocity of the sphere

146. ## Quantum Physics

The ground state wavefunction for a particle in a shallow potential well in 1 dimension is of the form: Ae−|x|2d. Given that the particle must be found somewhere in the range x∈[−∞,∞], the born rule then places a constraint on the modulus of A.

147. ## Quantum Physics

What is the probability current density of a particle with wavefunction ψ(x,t)=exp(iℏ(px−Et))?

148. ## calculus

Let y =x arcsin x, x is an element of ]-1, 1[. Show that d^2y/dx^2 = 2-x^2/(1-x^2)^3/2

149. ## Mathematics

Don is planting flowers in the school garden's planter box. The planting are is five and one-half feet long and 10 inches wide. Each plant is 2 inches wide. There must be 8 inches of space between the flowers. What is the largest number of plants he can

150. ## Economics

A market failure occurs when a free market is unable to A. distribute resources efficiently. B. provide open opportunity C. meet government regulations. D. encourage innovation.

151. ## MATHS

This question has mentioned 'pattern of numbers', does that means not just do simple calculation from left to right OR there is a fast way to solve this question, please help. Look at this pattern of numbers. 7x 11 x 13 x 1 = 1001 7x 11 x 13 x 2 = 2002 7x

152. ## chemistry

balance the following ionic equation: Sn(2+)(aq)+ Mn(2+)(aq)----- Mn(5+)(aq)+ Sn (s)

153. ## math

Simplify the expression. 5(x − 1) − 3(x^2 + 4x + 5)- 8(x+7)=

154. ## Calculus

If f(x) = 2sin(5x)arcsin(x), find f'(x).

155. ## proportions (math)

At ABC Inc, 7 out of 15 people got a raise. If ABC Inc employs 3,000 people, how many employees got a raise?

156. ## math

8 gallons per hour each gallon wt. 7 1/4 in six hours what is the amount in pounds?? and how did you arrive at this solution??

157. ## physics

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

158. ## Combinatorics

A movie company wants to make movies featuring various monsters. They want each movie to have at least 2 different monsters and no two movies to have the exact same set of monsters. What is the minimum number of monsters the company must use in order to

159. ## Quantum Physics

Suppose we have a particle in 1-dimension, with wavefunction Ae−|x|2d. What is the probability to find the particle in the interval [0,d]? Please provide your answer in terms of A, d, mathematical constants such as π (entered as pi) or e (entered as e).

160. ## Quantum Physics

Suppose that ψ1 and ψ2 satisfy the time independent Schrödinger equation for some potential. Which of the following necessarily also satisfies the Schrödinger equation? Cψ1ψ∗2 aψ1+bψ2 Aψ1/ψ2 Cψ1ψ2 In accorda

161. ## maths

solve 3cos^2 2x +4 sin 2x =1 0

162. ## MATHS

Please help! Pedro and Alice raced two model trains along two straight tracks. Pedro's train travelled 7.5 cm every minute. Alice's train travelled 7.5 cm every second. How many centimeters had Alice's train travelled when Pedro's train had travelled 2.75

163. ## science

Some plants grow best rich, well drained soil ? which kind of soil would be best for these plants ? a) clay b) sand c) clayey loam d) sandy loam

164. ## Physics Classical Mechanics

A body of mass m= 1 kg is moving along the x-axis. Its potential energy is given by the function U(x)=2(x2−1)2 Note: The units were dropped for the numbers in the equation above. You should note that 2 would carry units of J⋅m−4 and 1 would carry

165. ## Report (Writeacher or Ms. Sue)

Does my report require any editing? "Incorporated as a city in 1837, Chicago has experienced great changes, rapid growth, and an immense amount of industrialization since the time of its original creation. From once being inhabited merely by a Native

166. ## algebra

Daniel and Ethan raises money for a charity one week. Daniel manages to raise \$125.25. Ethan raises \$20 less and decides to donate only 25th of the money this week. Together they donate \$187.51 this week. How much money did Ethan raise?

167. ## science

Based on the treatment scheme, what type(s) of raw water is / are being treated? Groundwater River water Riverbank filtrate Lake water Infiltrated river water

168. ## Mathematics--Urgent

Don is planting flowers in the school garden's planter box. The planting are is five and one-half feet long and 10 inches wide. Each plant is 2 inches wide. There must be 8 inches of space between the flowers. What is the largest number of plants he can

169. ## Creative Writing

My topic is "a fictional character falls in love with its writer". I have the PERFECT ideas, but I just don't know how to write them. Does the character fall in love with ME, as the writer? Or should the story be about someone writing a book, and in THAT

170. ## Economics

Income not used for consumption is: A. savings B. spending C. donations D. none of the above

171. ## social studies

1. why did the french conflict with the Natchez over land? a) The Natchez were enemies of the Choctaw b) The Natchez were a warring tribe with no societal structure c) The Natchez lived on best farmland d) The Natchez invaded the land that the French

173. ## chem

Nuclide X has decay constant 1.08 h-1. It can decay in 2 branches, to nuclide Y or to nuclide Z: X --> Y, with decay constant 0.43 h-1, and X --> Z, with unknown decay constant. If there are 10 moles of nuclide X at time t = 0, how many moles of each

174. ## math analysis

also i don't understand this problem. i need help and to prove....the symbol ⊂ is subset. here the problem: Prove that There exist an open interval B = (c,d), and sets A and C, with B ⊂ C, and a function f: A-->C such that f^(-1)(B) is not an open

175. ## GEOMETRY

5√3/3 Can somebody evaluate this PLEASE!!!!!!

176. ## chemistry

Al(NO3)3+ NaCl

177. ## math

What does partial products mean in multiplication I'm confused

178. ## prealgebra

easy one OK. so if jack has a bike that he got for 50 dollars less than the original price so if the bike was 50 dollars less than the original price how much did he pay for the bike. write and equation and solve it.

179. ## algebra

A pipe manufacturer makes pipes of four different sizes. The diameter of each pipe is two times the diameter of the pipe of the next smaller size. The diameter of the biggest pipe is 16 centimeters. What is the diameter of the pipe of the smallest size?

180. ## Physics

A laborer is throwing 12 bricks per min from the ground and these just reach the roof which is 3.3 meters high. if the weight of each bricks be 3.75 kg then find the horse power with which the laborer is working.

181. ## sociology

Which theoretical approach overemphasizes some of the more negative aspects of older people? a. conflict theory b. Functionalist perspective c. the Thomas Theorem If I am a gerontologist studying whether the Federal government is providing sufficiently for

182. ## PHYSICS (HELP)

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

183. ## PHYSICS

Fish achieve neutral buoyancy (so they don't have to swim constantly to stay in place) via a swim bladder. A swim bladder is a little internal sack that they can inflate/deflate with air, which changes their volume but not their total mass. To see how this

184. ## math

write an equation that describes Felicia's total cost for playing tennis as a function of the number of times she plays. let c =the total cost and let n = the number of times she plays. Describe the domain and range of the function.

185. ## physics

a projectile with mass (m)=35grams is placed on a vertically positioned spring. the spring constant (k)=6500N/m. the projectile is launched straight up into the air by compressing the spring a distance (x)=8cm.How high does the projectile go?

186. ## college algebra

Let f(x) = square root (x + 2) and g(x) = x^2 − 2. Determine the domain of the composite function. (Enter your answer using interval notation.) f compose f ______? & Find the composite function. (f compose f)(x) = _____?

187. ## college algebra

Let f(x) = 1/x − 2 and g(x) = 1/x − 3 . Determine the domain of the composite function. (Enter your answer using interval notation.) g compose f _____? & Find the composite function. (g compose f)(x) = _____?

188. ## math

Let y = arcsin x, x is an element of ]-1, 1[. Show that d^2y/dx^2 = 2-x^2/(1-x^2)^3/2

189. ## Geography Report (Ms. Sue)

Is this an adequate beginning? "Chicago, like many of its surrounding cities in which share similar characteristics such as in architecture, large populations, and culture influences, is a part of the Great Lakes Region, in which includes Illinois,

190. ## water treatment

Which five quality parameters of the raw water may not meet drinking water standards?

191. ## Math

Is -6/5 greater than -5/6?

192. ## chemistry

oxidation of 1,methyl-propanone with the presence of KMnO4 & conc H2SO4 under heat.

193. ## math

can you help me factor this one? x^2 + x - 20=?

194. ## math

Can you please help me figure out what is "M"? 3 = 2M - + 9 3

195. ## Math

log a = 2 Find the vaule of A

196. ## Calculus

Simplify sin(tan^(-1)x)

197. ## Calculus

Simplify cos(sin^(-1)x)

198. ## Fossils

Do the actual organism remains exist in a cast fossil? Or is it just filled with minerals, mud, etc?

199. ## algebra

is there even a solution to this problem: x^2 − 10x + 20 = 0 I think this answer is no solution , please confirm I am right...

200. ## math

28E − 7 = 0 would I add 7 to the 0 then divide 28 by 7 but the answer don't check out

201. ## Economics

What types of machines are used to make stained glass windows in the 21st century? Could you also please tell me the prices of each machinery.

202. ## Economics... Last one!

What types of machines are used to make stained glass windows in the 21st century? Could you also please give me at least a website that tells me the prices of each machinery.

203. ## Maths

Three tired and hungry men went to sleep with a bag of apples. One man woke up, ate 1/4 of the apples, then went back to sleep. Later a second man woke up and ate 2/3 of the remaining apples, then went back to sleep. Finally, the third man woke up and ate

204. ## math

the sum of a number and four is -8 write in algebraic equation

205. ## PHYSICS

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

206. ## Physics Classical Mechanics

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end

207. ## English

Should this be who or whom and why? _____ did the general salute as he walked by?

208. ## Chem 1

Suppose 1.624g of salt FeSO4 is placed in a 250mL flask to which 50mL of water and 10 mL of 3M H2SO4 are added. How many mL of .1062 M KMnO4 solution are required to reach the endpoint?

209. ## Chem 1

Suppose 1.624g of salt FeSO4 is placed in a 250mL flask to which 50mL of water and 10 mL of 3M H2SO4 are added. How many mL of .1062 M KMnO4 solution are required to reach the endpoint?

210. ## Math

How do I write -2.3 as a rational number?

211. ## math

please factor this: x^2 + 9x +18=?

212. ## math

3L=7 what would L be? i was multipling - 7*5= 35 then divide by 3..but that 5 does not check right

213. ## algebra

Solve the equation. I need to know what W would be? 5(W + 2) − 6(W + 4) = 0

214. ## English

I have a few more questions about my English paper that I hope someone could check? 1. During our break, Stephanie's mother brought in drinks and cookies. (break, mother, drinks, cookies) 2. In Bert's report, he wrote about zoo animals. (report, animals)

215. ## Biology

Why wasn't PCR possible until Taq polymerase was discovered?

216. ## Algebra 2

How would you find x and y? [2x 1] [1 3] [-4 -9] = [2 0] [2 -y] [2 6]

217. ## college algebra

Let f(x) = x + 2 and g(x) = x2 − 2. Determine the domain of the composite function.

218. ## math

Two numbers are reciprocals if ___________________________

219. ## Quantum Physics

Suppose a particle has wavefunction ψ(x,t=0)=Aexp(−x22l2). What is the average value (expectation value) of p^, ⟨p^⟩, for this state at t=0?

220. ## math

I completely forgot the rules but.... if you have ((1-x)^1/2)^2 Then would you multiply the exponents to get 2/2 = 1 or add them to get 3/2

221. ## pritchett

what does D.A.R mean in S.S need to know ASAP

222. ## science

Since 1932 Louisiana has been losing approximately twenty four square miles of it's coastal wetlands per year. which process is least responsible for this loss of land? a) saltwater intrusion b) the building of levees c) the building of canals d) falling

223. ## Child Develpoment

Why should teachers avoid holiday crafts in the early childhood setting?

224. ## A Curious Question

What is this question asking? "What appears to be the smallest population needed to support a professional sports franchise?"

225. ## History

The Titanic was a ship that sailed between which 2 countries? a.Britain b.United States c.England What 3 countries make up the triple entente? a.France b.Russia c.Great Britain d.England Each word can only be used once for each question.

226. ## algebra 2

simplify the expression -5+i/2i

228. ## math analysis

i need help.. im not really sure how to start. There exist an open interval A=(x,y), x set B, and a function f:A-->B such that f(A)≠ f(x),f(y).. prove

229. ## GEOMETRY

simplify 5 squareroot(3)/3

231. ## MATH HELP

Log 1000 =a Log a =1 Log a = -1 What is the vaule of A

232. ## math

please simplify the expreesion: (2x − 1)(x^2 + 3x − 3)=

233. ## books (death of a salesman)

Which of the brothers will lead a more satisfying life, Happy or Biff?

234. ## college algebra

what is the domain of (square root of x) +7?

235. ## math

what is 2x+y=-7 in slope intercept form?

236. ## Math

If I had the math problem: 2^4 x 3^9 ---- ---- 3^5 2^7 And I used the method of sorting the bases and subtracting the exponents. Would my answer be 2^-3 x 3^4?

237. ## math

the sum of a number and four is -8 write this in algebraic expression

238. ## JVHS

What will the ratio of ions be from a group 1A metal and a group 7A non-metal?

239. ## GEOMETRY

simplify 5√3/3