# Questions Asked onFebruary 8, 2018

1. ## physics

A plane flies towards a ground-based radar dish. Radar locates the plane at a distance D = 41 km from the dish, at an angle of 52 degrees above horizontal. What is the plane's horizontal distance, from the radar dish.

2. ## Probability and statistics

For a single roll of two dice, are rolling a sum of 6 and rolling doubles independent events? Explain.

3. ## Physics

The radius of the Earth is about 6.37 × 106 m. a) What is the centripetal acceleration of a point on the equator due to the rotation of earth about its axis? Answer in units of m/s 2

4. ## Math

The toco toucan, the largest member of the toucan family, possesses the largest beak relative to body size of all birds. This exaggerated feature has received various interpretations, such as being a refined adaptation for feeding. However, the large

5. ## Vehicle

Is a pogo stick considered a vehicle?

6. ## math

A scientist is working with 7 meters of gold wire. How long is the wire in millimeters?

7. ## Science

How many calories of heat energy are required to melt 20 grams of ice at 0 °C? Answer: _____ calories How many calories of heat are required to evaporate 20 grams of liquid water at 0 °C? Answer: _____ calories

8. ## Chem Oxidation-Reduction Titrations

H2O2→ O2 + 2H+ + 2e- OCl- + 2H+ + 2e-→ H2O+ Cl- H2O2(aq) + OCl-(aq) → H2O(l) + Cl- (aq) + O2(g)Assign oxidation numbers to the following atoms: O in H2O2 ________; Cl in OCl- __________The oxidizing agent for this RedOx rxn is_____________. The

9. ## Physics

A particle is projected at 10ms^-1 from a height of 45m. Calculate the horizontal distance covered by the particle before reaching the ground(g=10ms^-2)

10. ## Algebra

Jack and Jill regularly run around an 800-meter track, but Jack runs 2 m/s faster. If they start from the same point on this track, and run in the same direction, Jack will eventually pass Jill in 6 minutes and 40 seconds. What is Jill's speed?

11. ## Algebra I

It is the grand opening of a local supermarket. Every 5th customer will receive a coupon for a free turkey and every 7th customer will receive a coupon for a free half gallon of ice cream. If 400 customers come in on opening day, how many people will get

12. ## Math :(

The scale of a map is 1 inch + 25 miles. How many miles does 1.25 inches represent? 25 miles 31.25 miles 62.5 miles 49.25 miles

13. ## Math

The local swimming pool is having a contest and all students are welcome to enter. The pool officials want a new logo that has rotational symmetry with 120⁰ and 240⁰ as its angles of rotation. Draw an entry for the contest.

14. ## MATH help can anyone check my answer plzz!!

1)evaluate the function for x=2f(x)=7x-5 A)9 B)19 C)-9 D)-19 2)Candy is on sale for \$0.75 each you have a coupon for \$0.25 off your total purchase write a function rule for the coast on n pieces of candy. A)C(n)=0.25n-0.75 B)C(n)=0.75n-0.25 C)C(n)=1.0n

15. ## algebra

Let A be an m×n matrix and b ∈ R m. Prove that the system of equations Ax = b is inconsistent if and only if there is a leading term in the last column of row echelon form of the augmented matrix

16. ## Physics

A particle is projected at 10ms^-1 from a height of 45m. Calculate the horizontal distance covered by the particle before reaching the ground(g=10ms^-2)

17. ## geometry

Triangle PQR is an isosceles triangle. The side QP is produced to S. Such tha PQ=PS,prove tha angle QRS=90 degree.

18. ## chemistry

Which one of the following pairs has only London dispersion forces as the intermolecular force between them? 1.) H2O; HF 2.)He; He 3.) HCl; HCl 4.) Ne; HCl please help I am so lost

19. ## Math calculus 2

The revenue, in millions of dollars, for a company in year t is given by the function: R(t)=15*e^(0.08*t), 0≤t≤15 and the cost, in millions of dollars, to run the company in year t is approximated by: C(t)=12*e^(−0.04*t), 0≤t≤15 where t is the

20. ## physics

A person standing 1.00 m from a portable speaker hears its sound at an intensity of 7.50  103 W/m2. (a) Find the corresponding decibel level. (b) Find the sound intensity at a distance of 35.0 m, assuming the sound propagates as a spherical wave. (c)

21. ## art

What was the underlying message of Georges Seurat’s A Sunday Afternoon on the Island of La Grande Jatte? People in cities interact less as a result of modern life. Modern life has united people together. A painting should be an exact, realistic copy of

22. ## science

How do I prepare 3% H2SO4 from concentrated sulphuric acid (98% with density 1.84g/ml)?

23. ## Physics

A 150m long train is moving with uniform velocity of 45km/hr.The time taken by the train to cross a bridge of length 850 meters is

24. ## Chemistry

Of the 3 elements fluorine, nitrogen, and carbon, what is the atomic number of the one that has the largest atomic radius?

25. ## physics

Q: A blue ball is thrown upward with an initial speed of 23 m/s, from a height of 0.5 meters above the ground. 2.8 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 6.6 m/s from a height of 28.9 meters above the

26. ## Math

Which of the following expressions is between 10 and 11?

S is the midpoint of RT. Which of the following completes the statement? ST = 38 ft; RT = ? A)38 ft B)19 ft C)76 ft D)96 ft I'm not sure how to find the correct answer, can someone please help?

28. ## chemistry

What is the difference between dipole-dipole interactions and dipole-induced dipole interactions? 1.) dipole-dipole interactions involve two non polar molecules. Dipole induced dipole interactions involve one polar molecule with a permanent dipole and one

29. ## Algebra

I have a pair of supplementary angles, the measure of one angle is 8 times the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

30. ## math help,,,,

solve the proportion 4/8 = w/32 w = 2 w = 7 w = 8 w = 16 i think its w = 2

31. ## math

Which of the following equations represents the line that passes through the point (0, -6) and that is parallel to the line x - 4y - 5 = 0? A x -4x - y - 6 = 0 B x 4x - y - 6 = 0 C x x - 4y - 24 = 0 D x x - 4y + 6 = 0

32. ## Chemistry

At 25oC, the equilibrium pressure of ammonia vapour above a 0.500 M aqueous ammonia solution is 0.84 kPa. Calculate the Henry's law constant for ammonia in M/bar. Do not include units. Include 4 significant figures.

33. ## Maths

A godown is 50m long. 40m broad. And10m high. Find the cost of white washing its four walls ceiling at rs 20per square metre.

34. ## Science

A man with a genetic disease marries a woman who does not carry the disease. It is not possible for their sons to have the disease. The disease must be X-linked dominat Y-linked dominat X-linked reccesive Y-linked reccesive I'm reposting this because i

35. ## Chemistry

Write down the electron configuration of the Cu(I) ion in the format 1s2_2s2_2p6_etc_etc.

36. ## physics

A sled and rider have a total mass of 57.2 kg. They are on a snowy hill accelerating at 0.5g. The coefficient of kinetic friction between the sled and the snow is 0.20. What is the angle of the hill's slope measured upward from the horizontal? You may find

37. ## Science

sample of alumium has a mass 6.3g.calculate the number of mole of alumium present and the number of atom of alumium in the sample(AL=27

38. ## chemistry

Rain: From the standpoint of solutions what processes lead to rain fall or other forms of atmospheric precipitation?

39. ## History Plz help i changed the answers

Ms. Sue, Reniy , Writeteacher . I changed my answers now can you check if they are correct? Please guys i really need a good grade 2. What role did nativism play in federal policy? A. Concern for immigrants' children led to increased public education

40. ## History

• what are the issues of Reconstruction covering its origins •what are the various reconstruction plans • how did the south show resistance •what were the factors that led to the end of this period?

41. ## Science

What are the important steps in empirical research?

42. ## science

he Bowen ratio describes how available heat at the Earth's surface is partitioned between latent heating (changes in phase of water) and sensible heating (conduction and convection). An increase in the Bowen ratio of agricultural land is the consequence of

43. ## Science

What are the criticisms of empirical research?

44. ## Math

I have a set of complementary angles, the measure of one angle is 8 degrees less than the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

45. ## Algebra

Billy was playing a trivia game. According to the rules, Billy would receive 25 points for each question he answered correctly but would lose 50 points for each question he answered incorrectly. At the end of the game, Billy had a total of 450 points. He

46. ## Math

Solve the proportion W/36=5/18 A. W=5 B. W=10 C. W=15 *** D. W=20

47. ## physic

A force of 75.0 N in the horizontal direction is required to set a 37.3-kg box, initially at rest on a flat surface, in motion. After the box begins to move, a horizontal force of 51.3 N is required to maintain a constant speed. (a) What is the coefficient

48. ## Calc 3

Describe the locus of points in R3 equidistant from the origin (0, 0, 0), and the plane x + y + z = 1.

49. ## Math

Mandy is making name tags in the shape of triangles. They all should be the same size. Explain how she can use a pattern to make 25 name tags. How does she know they will all be congruent?

50. ## Math

A pizza parlor divides a pizza into 7 equal slices. Each slice of pizza looks exactly the same. The pizza has rotational symmetry. What is the angle of rotation for the pizza?

51. ## Math

Why it is not possible to have 290 in an angle

Mandy is making name tags in the shape of triangles. They all should be the same size. Explain how she can use a pattern to make 25 name tags. How does she know they will all be congruent?

53. ## alegrba

which of the following is equivalent to 65% choose all that apply 0.065 0.65 13/20 13/25 (i tink it would be tis one)

54. ## math

the sum of a number divided by 4 and 5 is 2.

55. ## Math

What data are represented by the stem-and-leaf plot below? 3)(7 8 9 4)(1 3 7 5)(2 4 Key: 4 | 1 means 41

56. ## Physics

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 12.0 m long. His speed at the bottom of the swing is 8.3 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that

57. ## physics I need serious help please

A 1.49-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (4.00ti − 8.00j) N with t in seconds. (a) At what time t will the particle's speed be 14.0 m/s? s (b) How far from the

58. ## math

which of the following square pyramids have a volume of 24 mm. choose all that apply

59. ## mathd

A theatre has 11 riws if seats.which have 1to10 eries.unmatched numbers have fufteen sests and 16 seat have matched numbers.how many seats are there in theatre.?

60. ## math

Which of the following square pyramids have a volume of 24 mm. choose all that apply a square pyramid with a side length of 9 mm and a height of 8 mm a square pyramid with a side length of 3 mm and a height of 8 mm a square pyramid with a side length of 2

61. ## chemistry

A sample of argon initially has a volume of 5.0 L and the pressure is 2 atm. If the final temperature is 30° C, the final volume is 6 L, and the final pressure is 8atm, what was the initial temperature of the argon?

62. ## math

Which of the following square pyramids have a volume of 24 mm. choose all that apply a square pyramid with a side length of 9 mm and a height of 8 mm a square pyramid with a side length of 3 mm and a height of 8 mm a square pyramid with a side length of 2

63. ## Science

Geologist believe that The crystals inside a geode probably form when... A: Lava suddenly cools on earth’s surface B: Minerals dissolved in a solution evaporate C: Minerals dissolved in a solution crystallize D: magma cools slowly inside Earth Ok so

64. ## english

"Power tends to corrupt, and absolute power corrupts absolutely" --Do people with too much power tend to be corrupted by it? On the other hand, are there examples of people in positions of power that seem to use their status to do good? --Define what it

james is taking a test in his geomtery class. His teacher asked him to determine the equation of the line perpendicular to the line 2x-y=-3 and passing through the point (8,2) , which line should he choose. A. y+ 1/2x=6 B.y+2x=18 C. y-2x=-14 D. y +1/2x=9

66. ## Chem Oxidation-Reduction Titrations

In our lab, the data consists of 1. Volume of NaOCl (mL): Trial 1= 10 ml & Trial 2= 10 mL. How can we find the concentration (Molarity), what would the calculated value be? 2. Volume of H2O2 (mL): Trial 1= 1/ml & Trial 2= 1/mL. How can we find the given

67. ## PreCal

a circular arch of length 3ft subtends a central angle of 25 degrees. Find the Radius of the circle I got 6.875 but i think that is wrong

68. ## geometry

im not that good at geometry i need some one to check this for me XY bisects AB at point g which of the following is true about point g a. g is the mid point of AB b. g is the mid point of XY c. g is the mid point of AB and XY d. none of these*

69. ## Science

How is constructivism different from the scientific approach to research

70. ## social studies

How did textile factories improve the economy of South Carolina?

71. ## Science

A Statement : A boy pushes a shopping trolley (weight due 2 gravity of 150N) with a constant force of 75N . A constant frictional force of 20N is present 1, Draw a laballed force diagram n a free body diagram of all the forces acting on the trolley.

72. ## Maths

A wire is in the shape of a square of side 10cm. If the wire is rebent in to a rectangle of length 12cm.find its breadth which figure encloses more area and by how much.

74. ## Maths

The area of the 4 walls of a room is 168metre square the breadth and height of the room are 10m and 4m respectively. Find the length of the room

75. ## Chemistry

What is the n quantum number for the last electron added in the Aufbau procedure for forming the electron configuration of uranium?

76. ## Chemistry

What is the l quantum number for the last electron added in the Aufbau procedure for forming the electron configuration of barium?

77. ## Science

So I’m awful at summarizing and I came up with the really long answer and I know I need it shorter because it’s definitely not gonna fit on two lines. Please help! Large amounts of heat or transferred to earths mantle from earths core and the mantle

78. ## Chemistry

Of the 3 elements nitrogen, oxygen, and fluorine, what is the atomic number of the one that has the highest ionization energy?

79. ## Chemistry

Of the 3 elements fluorine, nitrogen, and carbon , what is the atomic number of the one that has the lowest ionization energy?

80. ## Chemistry

Of the 3 elements nitrogen , oxygen , and aluminum, what is the atomic number of the one that has the smallest atomic radius?

81. ## physics

Q: Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5.7 m/s2 for 3.2 seconds. It then continues at a constant speed for 8.8 seconds, before applying the

82. ## physics

can somebody shows me how to get to the answer key-- a)=2.51s, b)=19.9m, and c)=11.8i-16.1j A 1.57-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (7.00ti − 8.00j)N with t in

83. ## Chemistry

Write down the electron configuration of sodium in the format 1s2_2s2_2p6_etc_etc.

84. ## Physics

Object 1, which has mass 100 kg, is moving at 3 m/s and collides with Object 2, which has mass 50 kg and is moving at -8 m/s. If the first object stops moving after the collision, how fast would the second object be moving at that time? I think the answer

85. ## Chemistry

What is the energy in Joules of a photon of light having a frequency of 1.000 1018 typical of the gamma ray region of the electromagnetic spectrum?

86. ## Chemistry

Calculate the pressure in atmospheres in the ocean at a depth of 3.20 km assuming the constant density of sea water in the water column is 1.10 g/mL. The atmospheric pressure is 1.00 atm.

87. ## dynamics

A force F=160N is applied to the cord. Determine how high the 400N block A rises in 2s starting from rest . Neglect the weigth of the pulleys and cord.

88. ## ART

why might a college choose to use Greek architecture elements when designing the central building on campus??? A.)to symbolize Grecian ideals of peace and love. B.)to symbolize Grecian ideals of truth and knowledge. C.)to symbolize Grecian ideals of

89. ## Science

What makes “real-life” empirical research different from this ideal model

90. ## differential Equations

solve the initial value problem and find the interval of existence... cos(y) dy/dt = -t sin(y)/ (1+t^2) , y(1)=pi/2

91. ## Maths

Solve for: 4^x+4^(1/x)=18

92. ## Science

Earthquakes and Seismic Waves •If the statement is true right true if the statement is false change the underlined word or words(I’ll put them in parentheses) to make this statement true.• 1.______The shaking and trembling that results for movement

93. ## physic

A 1.57-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (7.00ti − 8.00j)N with t in seconds. (a) At what time t will the particle's speed be 19.0 m/s? s (b) How far from the

94. ## Math

It costs Luis \$5 to park his car at a parking meter for 2 hours. What is the price to park for 1 hour? Write a word sentence to help you solve the problem. Then write and solve a multiplication equation. Please help me.

95. ## Maths

What is the probability that an year will have 53 Tuesdays

96. ## Math

An architect make a model of a building with a volume of 1440 cubic centimeters? The length of the model is 15 centimeters and the width is 12 centimeters. How many centimeters tall is the model

97. ## Physics

Please show each step: Tony burns a 0.6 gram peanut submerged in 50 grams of water, which increases its temperature from 22 to 50 ° C. a) Assuming an efficiency of 40%, calculate the nutritional value of the peanut. b) Demonstrate that the nutritional

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98. ## Physics

Hammering a nail into wood makes it get hotter. Consider a 5-g long, 5-gauge steel nail and a hammer that exerts an average force of 500 N on the nail when it is introduced to a piece of wood. The nail gets warmer each time. Demonstrate that the increase

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99. ## Pre-Algebra

What are all the triangles classified by side? Click all that apply. Equilateral Acute Obtuse Isosceles Scalene Right

100. ## Physics

If you want to heat 100 kg of water at 20 ° C for your bath, calculate the amount of heat in the water. Then it shows that this is equivalent to 8360 kilojoules.

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101. ## Organic Chemistry

what would be the disadvantage of recrystallizing salicylic acid after is has already been recrystallized?

102. ## University Genetics

In humans pattern baldness is a sex-influenced trait, whose degree of expression is controlled by the sex of the individual, such that it is autosomal dominant in males while autosomal recessive in females. On the other hand, colour blindness and

103. ## Maths urgent

4^x+4^(1/x)=18

104. ## math

Kate is a salesperson. she sold a computer printer for 76.85 and earned 20% commission. how much commission did kate earn?

105. ## math

A student’s score on the first four mathematics tests of the year were 80, 95, 92 and 89. What must the student score on the fifth test so that the mean score for all five tests is exactly 90?

106. ## Math

How is 1 an even number?

107. ## geography

How might the Pacific Island Trade Agreement (PICTA) help the Pacific islands trade with major markets all over the world? A-The region as a whole could partner to sell to bigger markets*** B-It will help the islands sell to each other not other markets

108. ## math

Mr. Bigelow's garden is a rectangle with dimensions x feet long and y feet wide. Its perimeter is 70 feet. a. Write a function to represent the perimeter of his garden. b. What are the x- and y-intercepts of the function? c. Does either intercept make

109. ## science

What is mutation? 1.A mutation is a permanent change in the order of bases in the DNA. 2. A mutation is a permanent change in the way the cell carries out mitosis I think #1 Thanks

110. ## Physics

If you want to heat 100 kg of water at 20 ° C for your bath, calculate the amount of heat in the water. Then demonstrate that this is equivalent to 8360 kilojoules. 20° C x 100 kg = 2000000 cal I'm unsure what to do after converting it to calories as to

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111. ## physics

Harry Potter decides to take Pottery 101 as an elective to satisfy his arts requirement at Hogwarts. He sets some clay (m = 4.00 kg) on the edge of a pottery wheel (r = 0.730 m), which is initially motionless. He then begins to rotate the wheel with a

112. ## Math

Akio and 7 friends will share 3 liters of juice equally. How much juice does each person get?

113. ## Math

Nafi can row down a 20- mile stream in 2 hours and can return in upstream in 5 hours.What is his average rate,in miles per hour,for the entire trip? a.10/7 b.7/2 c.20/6 d.3 e.40/7

114. ## Pre calc

Use half angle indentites to find an exact value without a calculator Cos(11π/12)

115. ## Chemistry

Now if your lab partner determined that there were 1.157 x 1020 atoms of Mn in an unknown sample of KMnO4, how many milligrams would the unknown sample weigh?

116. ## Science

Egg-laying land animals have evolved to produce eggs with tough shells to ensure that 1 external fertilization can take place. 2 the egg and sperm can fuse 3 parental care is unnecessary*** 4 the developing embryo does no dry out

117. ## Chemistry

Now if your lab partner determined that there were 3.824 x 1023 atoms of H in an unknown sample of C2H4Cl2, how many milligrams would the unknown sample weigh?

118. ## Math

Find the equation of the horizontal line that divides the area of the region in half y=18−x^2, y=0.

119. ## math calculus 2

Find the area of the region RR bounded by y=sin(x), y=cos(x), x=−π/3, x=13/6.

120. ## Calculus 2 (math)

A factory installs new machinery that will save 1250−38x dollars per year, where x is the number of years since installation. However, the cost of maintaining the new machinery is 81x dollars per year. Find the accumulated savings that will occur before

121. ## math

In 2010 the birthrate in a certain country increases from 11*(e^(0.04*t)) million births per year to 16*(e^(0.04*t)) million births per year, where t is the number of years since January 1, 2010. Set up the integral and find the projected increase in

122. ## Web Design 1 B

Web Design I B Unit 1: Basics of HTML Lesson 7: Cascading Style Sheets (CSS) 1. In the following piece of CSS code, what is the rule? p { color: #676767 } A- #676767 B- color C- p D- p { color:3676767 } 2. In the following piece of CSS code, what is body