# Questions Asked onJanuary 29, 2017

1. ## solar science physics

Which of the following statements is NOT true about solar inverters? A stand-alone inverter is supposed to work as an AC voltage source for a specified range of AC loads. An ideal grid-tied inverter has its operational voltage and frequency synchronized

2. ## Precalculus

Let $\mathcal{G}$ be the graph of the parametric equations \begin{align*} x &= \cos(4t),\\ y &= \sin(6t). \end{align*}What is the length of the smallest interval $I$ such that the graph of these equations for all $t\in I$ produces the entire graph

3. ## solar science physics

On the left-hand side of the figure below a III-V triple junction solar cell is shown. On the right-hand side, the J-V curves of the individual component cells and the multi-junction solar cell are shown. Which junction corresponds to sub cell 3?

4. ## math

So a moped travels at 40km/h for part of a trip and 10km/h for the remainder. If it takes 5.75 hours to travels 185km, how far did it travel at each speed?

5. ## physics

A piece of copper ball of mass 20g at 200°c is placed in a copper calorimeter of mass 60g containing 50g of water at 30°c ignoring heat losses.calculate the final steady temperature of mixture.(specific heat capacity of water=4.2jg-1k-1)

6. ## English

peer pressure destroys character yes or no?.

7. ## English

1.) Read the following lines from the poem Africa. "Impetuous son that tree young and strong. that tree there in splendid loveliness amidst white and faded flowers. that is Africa your Africa. that grows again patiently obstinately. and its fruit gradually

8. ## math

An ice cream van sells 3 different ice-cream flavours with 4 different toppings. How many different choices can be made using only one of the ice-cream flavours and only one of the toppings?

9. ## English

Please please please check my answers and explain to me why they are right or wrong!!! 24.) Choose the correct voice of the underlined verb. (1 point) The pitcher THREW the ball to the catcher. a.) active** b.) passive 25.) Choose the correct voice of the

10. ## economics

Indicate if each newspaper headline below deals with a microeconomics (micro) or a macroeconomics (macro) issue. Pepsi to Introduce a New flavor - micro Russia Devalues Currency - macro Red Cross Needs Blood- micro Microsoft Still Tied-Up in Legal battle -

11. ## Chemistry

Given Ka values of 5.76×10^-10 & 4.8×10^-10, for NH4+ anf HCN.what is the equilibrium constant for following reaction? NH4+ + CN- >< NH3 + HCN

12. ## Math

one track coach wants his athletes to race 8 miles around a track to measure how fast each person can run if the track is 2/3 of a mile around. How many laps around the track will the athletes have to run to complete the race?

13. ## English

Read the following line from "The Pin": I felt like a character in an old Jimmy Stewart movie. The reference to "Jimmy Stewart" in this line is most likely intended as a (an) _________ allusion. a.) biblical b.) literary** c.) historical d.) mythological I

14. ## Science

A white eyed male Drosophila is crossed to a red eyed female all the resulting progeny have red eyes. A. This shows that eye colour is sex linked. B. This shows that eyes are recessive to white eyes. C. Both of the above. D. None of the above I think it is

15. ## Math

Solve the Identity cot (x)/ (csc(x)-1)= (csc(x)+1)/cot (x)

16. ## Algebra

Last year the population of Spoon Forks grew from 1250 to 1300. If the population of the town grows by the same percent this year, what will the population be?

17. ## Maths

A store marks up the price of a lounge by 80%. What percentage discount would bring the price of the lounge suite back to its original price?

18. ## Help -Social Impact of Technology

Respecting energy, in Leslie White’s formula, E=P*T, “T” stands for: A. the measure of energy efficiency. B. the sum of energy produced. C. energy production per capita. D. a measure of energy dissipation per capita. An:D

19. ## Earth Science

What are the maximum and minimum dimensions (the size range) for the following particle sizes? a) cobble: b) pebble: c) sand: PLEASE HELP

20. ## Chrmisty

Find the pH at each of the following points in the titration of 25 ml of 3.0M HF with 0.3 M NaOH. The Ka value is 6.6x10-4. After adding 25 ml of 0.3M NaOH

21. ## Physics

On the map, let the +x-axis point east and the +y-axis north. A)An airplane flies at 990 km/h northwestward direction (i.e., midway between north and west). Find the components of its velocity. B)Repeat for the case when the plane flies due south at the

22. ## Maths

There are m boys and 12 girls in a class what is the probability of selecting of random 1 a girl 2 a boy from class

23. ## mico vs. macro

Indicate if each newspaper headline below deals with a microeconomics (micro) or a macroeconomics (macro) issue. Pepsi to Introduce a New flavor - micro Russia Devalues Currency - macro Red Cross Needs Blood- micro Microsoft Still Tied-Up in Legal battle -

24. ## organic chemistry

The constants for Antoine’s equation for TCE (based on log10 and o C) are: A= 6.5183, B = 1018.6 and C = 192.7. If a container (negligible volume) is placed in a sealed room 1000 m3 at 30 oC, how many grams of TCE will evaporate upon reaching equilibrium

25. ## Math

Seth has three more than twice as many baseball cards as Aaron. Together they have 33 baseball cards. How many cards does Seth have? Answer: I dont understand please help

26. ## linear algebra

Hello, how can I proof the next theorem? I have a linear transformation T(X) that can be express as T(X)=AX and A is an orthogonal matrix, then ||T (X)||=||X|| , I was doing this: ||T (X)||=sqrt() But I don't know what to do with the orthogonal matrix..

27. ## Trigonometry

A plane at an altitude of 12,000 feet finds the angle of depression for a building ahead of the plane to be 10.4 degrees. With the building still straight ahead, two minutes later the angle of depression is 25.6 degrees. Find of the plane relative to the

28. ## English

.) Read the following sentences from "The Pin". "That all changed when my family moved. My new school is three times bigger than my old school. At first, no one here knew me. The kids were polite, but they did not treat me like a good friend. For a few

29. ## english

Identify the compoundâ€‹ verb: On theâ€‹ weekends, I exercise and do things with friends. A. â€‹exercise, do things B. â€‹exercise, do C, on the weekends

30. ## so

Which junction corresponds to sub cell 3? Sub cell based on Ge. Sub cell based on GaAs. Sub cell based on GaInP. Sub cell based on GaInAs.

31. ## statistics

. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?

32. ## mathematics

a(x+b)=c by making x the subject of the formula. ax+ab=c divide both sides by an a(x+b)÷ab=c ÷ a+b ax=c/a+b

33. ## solar science physics

Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. What is the total capacity of energy in watt-hours that can be stored in the battery?

34. ## Physics

You drive 109 km/h east for 31 min , then 82 km/h north for 42 min . Let the +x-axis point east and the +y-axis north. A)Find your average velocity for the entire trip. B)Find your average speed for the entire trip. You should probably do part b first.

35. ## Physics

A baseball hit just above the ground leaves the bat at 27 m/s at 45∘ above the horizontal. A)How far away does the ball strike the ground? B)How much time is the ball in the air? C)What is its maximum height? Find the time for the ball to go the

36. ## 7th G science

What is/are the main factor(s) that determine(s) the height of a plant (genetics, environment, or both)? Explain your answer. I think that only genetics play a role but I am not sure.

37. ## Math

A plane flies from city x to city y against the wind in 8 hours and flies back from city y to city x with the wind in 5 hours. If the speed of the wind is 650 mph, find the wind speed in mph?

38. ## Math

From 1980 to 1990 the population of London increased by 6%. From 1990 to 2000, the population of the city decrease by 3%. What was the overall percentage change in the population of London from 1980 to 2000?

39. ## Physics

A dram of mass 100kg is rolled into the deck of long 1.5m above a horizontally floor using a plank 4m long.calculate the work done against gravity during the process [Take g=10ms'2]

40. ## Physics

The velocity graph of a particle moving along the x-axis is shown. The particle has zero velocity at t=0.00s and reaches a maximum velocity, vmax, after a total elapsed time, t total. If the initial position of the particle is x0 =6.22m, the maximum

41. ## Coordinates

prove that the points (-4,-3), (-2,2),(8,-2)are the vertices of a right angled triangle.

42. ## Geometry

find the equation of an elipse whose vertices are (2, -2) and (2, 4) and whose eccentricity is 1/3

43. ## Geometry

a regular triangular pyramid has all of edges of length 36. What is the angle between any two faces of this pyramid.

44. ## physics

starting from rest, a car accelerates at a constant rate of 3 m/s^2for a time of 5 s; a. compute the velocity of the car at 1 s, 2 s,3 s, 4 s, and 5 s and plot these velocity values against time. b. compute the distance traveled by the car for these same

45. ## math

1. a number is subtract from 20 the result is 10 what is the number 2.i multiply a number by 10 and where 12 is remove the result is 18 what is the number 7

46. ## Discrete math

(a) Use the Euclidean Algorithm to nd gcd (2017; 271) and use this to nd integers x and y so that gcd(2017; 271) = 2017x + 271y. (b) Is it true that for all integers a and b, if not both a and b are zeros then not both

47. ## Help -Social Impact of Technology

According to a report on 18 scientific associations, __________ that we are in an age of human-caused climate change. A. all of the 18 affirm B. about half of the 18 agree C. only two of the 18 disagree D. about two thirds of the 18 affirm An: A

48. ## chemistry

a pipet can be calibrated. we expected the volume to be 25.00ml, but the actual volume was significantly less. if you had measured the density of an unknown with this pipet and assumed that v=25.00ml, your result would not be correct. would it be too high

49. ## Physics

for an egg drop project, does putting straws at the bottom of an egg protect it from crashing?

50. ## Math

At what point of the curve y= x^4 is the normal line parallel to 2x + y = 3? Find the equation of the normal line.

51. ## Math

fred is more than 3 years more than twice the age of jane. the sum of their ages is 48. how old is each?

58. ## Math

Simplify the follow)ing to the simplest form (tan(x) +cot(x))/ (tan(x)*cot(x))

59. ## Physical sci

The Density of aluminum is 2.70 g/cm3. What volume does 2000 g occupy?

60. ## math

On a test you answered six 5-point questions and eight 2-point questions. You earned 92% of the possible points. How many points is the test worth?

61. ## Math

cos(x)/(1-tan(x)) + (sin (x))* cos(x))/ sin (x)-cos(x))

62. ## Physics

A cannon ball is fired horizontally from a cannon that is 40.7m above the ground. The initial velocity of the cannon ball is 234m/s. How much time does the cannon ball spend in the air?

63. ## sociology

Sociologist argue that unlike scientifice knownledge common sense conclusion are

64. ## biology

what role doescarbon dioxide play in plant processes

65. ## Math

The sum of 23 and Hans height is 54

66. ## Chemistry 112

Can rate of law be a decimal??

67. ## English

Insert colons as needed. 1. Uncle Jerry likes the following authors Alex Haley, Mark Twain, and Willa Cather. 2. Remember these tips when you drive courtesy, caution, and judgment. 1. Uncle Jerry likes the following authors: Alex Haley, Mark Twain, and

68. ## chemistry

Calculate ∆S universe for the process H2O (s) → H2O (l) given that ∆Hfusion = 6.02 kJ/mol and ∆S system = 22.1 J/K mol . Remember that ∆S surrounding = -∆Hsystem / T. a) -20oC b) 0oC c) 20oC

69. ## Chemistry

How many liters would 1.000g of helium gas occupy at STP?

70. ## Math

Six groups of students sell 162balloons at the school carnival there are three students in each group if student sells the same number of balloons how many balloons does each to student sell

71. ## Chemistry 112

Can someone please explain to me how to calculate reaction order with respect to something? I've read this in my textbook, and I watched videos on YouTube, but I still don't understand. Please help.

72. ## physics

A car traveling at 100 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.85 m . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of

73. ## English

Write the correct form of the word cliche. By now, the "damsel in distress" plot is not only ______, but outdated. Answer: cliched

74. ## Calculus

I am having trouble with this question and I am unsure how to solve it... True or False (with justification) The function sin(x) if x ≤ 0 f(x) = 1+cos(x) if x>0 has a jump discontinuity at x = 0.

75. ## Geology

Which of the following is a mineral?

76. ## Algebra2

let f (x)=x-3,and g(x)=x^2 find f(g)(4)

77. ## English

Express how the device below and structure helps acheive the purpose of chapter 4. The book is called Narrative Of The Life Of Fredrick Douglass. I just need to write a paragraph. given: brutality of slavery device: diction and structure All i know is for

78. ## chemistry

A solution of 25.0mL of 0.10mol/L hydroiodic acid is titrated with 0.10mol/L ammonia.Determine the pH at equivalence.

79. ## applied calculus

From a height of 25 meters a ball is thrown vertically upwards at a velocity of 5 meters per second. a.What time in seconds will the ball reach its maximum height? b.What is its maximum height? c.When will the ball strike the ground? d.What will be the

80. ## probability

a teacher holds 40 class cards of 14 girls and 26 boys. shes huffles the cards and drawn one. a. what is the probability that the card drawn is a girl's card? b. what is the probability that the card belongs to a boy? c. what is the probability that the

81. ## physics

is the height of a ball be thrown directly related to the initial velocity? if i were to graph initial velocity as y and height as x,would it be a linear trend?

82. ## verbal reasoning

write the word of four letters which could go after each word in this line losing winning in out be thank you if you help. if you dont help its OK at least you got my question

83. ## English

The following sentences lack necessary end marks, commas, semicolons, and colons. Insert the correct punctuation in each sentence. 1. In the final most exciting quarter of the game Brian kicked two field goals 2. That price however does not include the

84. ## Astronomy

Neptune can complete a rotation at 18 to 20 hours. You're rania's can make one in 16 to 28 hours. What is the average time it takes Neptune to complete rotation? What is the average time it takes uranus to complete a rotation? What is the average for both

85. ## Physics

A boy kicks a rock off a cliff with a speed of 15.5m/s at an angle of 53.5° above the horizontal. The rock hits the ground 5.37s after it was kicked. How high is the cliff? I found the height of the cliff which is 7.45*10^1 m. What is the speed of the

86. ## verbal reasoning

unscramble this anagram to make one word with the meaning given in brackets. GREEN MEAT (holding the same opinion) thank you to all who help:D

87. ## English

Most of the following sentences lack at least one period, question mark, exclamation point, comma, semicolon, or colon. If a sentence is already correct, write C. 1. When the hurricane began to tum toward land the governor issued an evacuation order for

88. ## Probability, Stats

For every 1000 batteries produced by a manufacturer 15 are defective. What is the probability that 100 randomly chosen batteries will have exactly 2 defective batteries?

89. ## verbal reasoning

which letter of the alphabet makes BERT a hat? write the new word in brackets and write the letter thank you helpers:D

90. ## math

I need help here log2^(3) + log4^(7)

91. ## science

n a cross between homozygous red-eyed "Drosophila" females and white-eyed males,? A. All the offspring will have white eyes or B. Ditto to A.> red eyes or C The male offspring will have red eyes and female offspring white eyes. I thin the answer is B or A

92. ## math

Jacky is cutting 4 yards of fabric into 7 pieces of equal length. Which expression represents the fraction of a yard each piece will be? 7-4 4-7 7/4 4/7

93. ## Physics

How much force does it take to push an 80 lb. steel cart on wheels?

94. ## Math

what is the sqaure root of -3/2*81

95. ## English

The following sentences lack necessary end marks, commas, semicolons, and colons. Insert the correct punctuation in each sentence. 1. After you make the salad please set the table Jorge 2. What a great time we had at the beach 3. No you may not stay up

96. ## math2

When s is measured in meters and t is measured in seconds, find the velocity at t = 2 of the following a. s = t^2 + 3t b. s = t^3 - 3t^2 c. s = squareroot t + 2 Help plz

97. ## Math

The sides of triangle are in ratio 5:3:4 and it's perimeter is 180m find altitude of the triangle corresponding to its largest side

98. ## Math

what is 2x+2=4?

99. ## math

a school has 720 pupils. one day 36 pupils were absent, what fraction represented those who are present?

100. ## Chemistry

The vapor pressure of pure water at 30C is 31.8Torr. What is the vapor pressure of a solution of NaCl dissolved in water when the mole fraction of NaCl is 0.111? I am wondering if this would be correct. 0.11*31.8= 3.5 Torr Is there another way to solve

101. ## La state history

in 3-5 sentences describe the apportionment system for state legislative districts I cant seem to think of any please help. Ms.Sue

102. ## statistics

For a sample of 50 days, George Murnen made an average of 5.02 calls per day. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?

103. ## science

What is the balanced molecular equation for titration of oxalic acid?

104. ## calculus

I have a definition lim theta approaching 0 sin theta/theta = 1 so show if the limit x approaching 0 sin2x/5=2/5

105. ## English

Most of the following sentences lack at least one period, question mark, exclamation point, comma, semicolon, or colon. Add the correct punctuation where it is needed. I have added punctuation in second set of sentences. 1. African American author Maya

106. ## math

the aquarium's height is 11 inches, width is 8 inches, and length is 20 inches, he wants to replace the water. how much water does the aquarium hold?

107. ## Math

Four subtracted from 3 times a number is 29. Find the number

108. ## math

use the method of substitution to solve the following pairs of simultaneous equation. 2m+n=0,m+2n=3

109. ## Science

Starting from rest an airplane moves with a constant acceleration of 2m/s for 30 seconds before it takes off A. How far does it travel down the runway before it takes off ? B. What's it's final velocity ?

111. ## math

The sum of ages of Sam ang thomas is 27 years. Seven years ago, Toma's was three years more than one fourth as old as Sam. Find their present ages

112. ## math

One leg of a right triangle is one less than twice the other. The area of the triangle is 18 square feet. What is the length of the 3rd side of the triangle? Solve by factoring. A= 1/2 (b)(h) 18= 1/2 (x)(2x-1)

113. ## Math

The third term of an A.P is 20, the fourteenth term is 64. Find the first term, the common difference and the nth term

114. ## Mathematics

Of the 82 pupils in grade 9, 73 take mathematics 56 take science, all those who take science take mathematics. Show the information on the venn diagram. How many take neither mathematics nor science?

115. ## Science

If a tree lost all its leaves, is it dead?

116. ## calculus

Let g(x)={x^2-x-2 if x is not equal to 1 {0 if x=1

117. ## Math

I am stuck on the question Jeremy collected nickels for one week he is making stacks of his nickels to determine how many he has the thickness of one nickel is 1/6 inch what is the combined height of 3 nickels 2 nickels and 1 nickel help me I don't get

118. ## Physics

Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 38 km away, 19deg north of west, and the second team as 28.7 km away, 35deg east of north. When

119. ## calculus

Define h(x)={x^2 if x>=-1 {ax+b if x

120. ## Algebra

Can you please help me with this math problem: 5 6 2 9 12 3 (4X Y Z) X (5X Y Z) The numbers at the top are exponents.thank you

121. ## math

evaluate without using L'Hopital theorem the following limit lim x-->0 [(sin(x)-x)/(x-tan(x))] the answer is 0.5 but I want to know the steps to calculate such a problem

122. ## calculus

define f(x)={x+a if x>2 {-1 if x=2 {ax+b if x

123. ## English

Most of the following sentences lack at least one period, question mark, exclamation point, comma, semicolon, or colon. Add the correct punctuation where it is needed 1. I looked for my keys in the kitchen on the porch and under the bed but still couldn't

124. ## math

evaluate without using L'Hopital theorem the following limit lim x-->0 [(sin(x)-x)/(x-tan(x))] the answer is 0.5 but I want to know the steps to calculate such a problem

125. ## Need Help

Which is the intransitive verb? The judge who presided over that controversial case last year now seeks another term in the upcoming election "Seeks" is the intransitive verb

126. ## Maths

The length of a chord of a circle of radius 10 cm is 12 cm. Some the distance of the chord from the centre of the circle.

127. ## Math

Find the smallest integer value of N such that f(x)=O(x^N). a) f(x) = x^7 - 150x^6 + 3x^3 + 111 b) f(x) = (x^3 + 2x^2) / (x^4 + x^2 + 1) c) f(x) = ⌈x⌉ d) f(x) = ⌊x⌋

128. ## Science

A battery of 3cells in series each of emf 2v and internal resistance0.5 is conected to a 2resistor in series with a par

asked by Monday Japheth, SALAMA High School, Physics
129. ## Algebra

Can you please help with this problem: my previous post didn't come out correctly: (4X5Y6Z)2 x (5X9Y12Z)3 The number after the letter is an exponent....4X to the fifth power Thank you

130. ## physics

Uranium 235 has 92 protons in its atoms. Calculate the number of neutrons in this atom

131. ## Chemistry

Compunds formed by NH4+ and NO3-

133. ## Physics

state the finctions of double wall,silver wall and cork sttoper -

134. ## des school

the volume of a cylinder 288picm3 the base radius is 8 cm find its tsa leave the answer in terms of

135. ## Physics

determine the magnitude and direction of the net force acting on q0 where q0=1uC ,q1=-1uC,q2=2uC and q3=-4

136. ## Spanish

Hello, Can someone please help me edit the answers to my reading response questions for grammatical correctness. It would be greatly appreciated! 1. ¿Cuál es el ambiente de este cuento? --Answer below: El ambiente de este cuento es de una el camino a

142. ## Statistics

3 batteries are chosen at random from 15 batteries of which 5 are defective. Find the probability if: 1) none of 3 are defective 2) exactly one is defective 3) 2 defective and 1 non-defective 4) at least one is non-defective What should I do? Is it

143. ## Science

Suppose you are pulling a wagon with th handle at an angle.how can you make your task easier

144. ## Maths

A fighter accelerates from rest at 120,000 m/s^2 for a time of 4 seconds. How far did the jet fighter travel?

145. ## Vision

Write A Speech For The Sendforth To Your Teacher Travelling To The Usa

146. ## Math

Garage charges one time rate of $8 plus$1.50 per half hour. What function represents total cost C(x), for parking for x hours

147. ## Geometry

What is the relative position of two lines if their orthogonal projection onto the projection planes are a) parallel lines b) coinciding lines c) intersecting lines

148. ## Physics

Two spheres are cut from a certain uniform rock. One has radius 3.54 cm. The mass of the other is 3 times greater. Find its radius.

149. ## Geometry

Angle C and Angle D are supplementary angles. If the measure of Angle D is nine less than twice the measure of Angle C, find the measure of Angle D. PLEASE HELP!!! I have no idea where to even start!

150. ## Math

Comparison of bottles 1/3 and 2/6

151. ## math

JOhn hs 2 apples, Many has 9 apples, how many apples are in total?

152. ## Math-Geometry

I am having a difficulty with solving proofs, such as triangle proofs for my homework, is there any tips and tricks to be able to solve them?

153. ## Science

The surface r of a liquid depends on the density p acceleration due to gravity g nd height h use the method of dimension to derive the actual relationship between this quantities. An object is tie to the end of a string move in a circle the force exerted

154. ## Math

The difference of two consecutive numbers is 15 the greater number is X then find the smallest