# Questions Asked onFebruary 26, 2018

1. ## english

The students in the back of the room were talking so ________ that I couldn't concentrate ________ on my assignment. Question 2 options:

2. ## maths

Prove SinA/1-CosA = CosecA + CotA

3. ## physics

The temperature difference between the inlet and the outlet of an air-cooled engine is 30.0K. The engine generates 7.0kW of waste power that the air extracts from the engine. Calculate the rate of flow of air (in kg s^-1) needed to extract this power?

4. ## Algebra 1

A baseball is thrown into the air with an upward velocity of 30 ft/s. Its height h, in feet, after t seconds is given by the function h=-16t^2+6. How long will it take the ball to reach its maximum height? What is the ball's maximum height? What is the

5. ## Physics

Two capacitors are identical, except that one is empty and the other is filled with a dielectric (k = 4.2). The empty capacitor is connected to a 14 -V battery. What must be the potential difference across the plates of the capacitor filled with a

6. ## Physics

The equation y=5 sin(3x-4), where y is in mm, x is in m and t is in secs, represents a wave motion. Determine the frequency, period and speed of the wave

7. ## Math

Question: Can the numbers 24, 32, 40 be the lengths of the three sides of a right triangle? Please explain why or why not? My answer: Yes, the numbers 24, 32, 40 can be the lengths of a three-sided right triangle because of the Pythagorean theorem (a^2 +

8. ## Chemistry

What volume of oxygen at NTP is required to oxydize 100gram of glucose ?

9. ## Chemistry

Bromine and chlorine gas react to give bromine monochloride (BrCl) according to Br2(g)+Cl2(g)⇌2BrCl(g) Given initial concentrations [Br2]=1.50 mol L-1, [Cl2]=0.90 mol L-1 and [BrCl]=0 and K=7 determine (to two decimal places) the equilibrium

10. ## Chemistry

If the specific heat capacity of ice is 2.10 J/(g.°C), how much heat is required to heat 530 g of ice from -45.0°C to -15.0°C? 1.) 33.400 kj 2.) 32595 J 3.) 33.4 kj 4.) 33000 J I was out sick when we learned this please help

11. ## AP Chem

Which of the following conditions would most likely affect the rate of a chemical reaction? A. Increasing the number of reaction steps B. Decreasing the size of the reaction vessel C. Increasing the concentration of reactants D. Decreasing the amount of

12. ## maths

If f(x)=x3+lx+m leaves the same reminder when divided by (x-1) or by (x+1). Find values of l and m?

13. ## Math

What is an even number that has a seven in the hundreds place the thousands place is an odd number and it is a multiple to ten please help

14. ## physics

A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?

15. ## History

Which of the following statements about American citizenship are true? Select that apply (3points) A:To become a naturalized citizen, a court order must be issued. B:Natural-born citizens can be determined by location or relationship.*** C:Collective

16. ## Calculus

Use the ratio test to find whether the series diverges or converges. 1/5^n (1 to infinity) I think the limit converges to 1/5, so the series converges.

17. ## math

The sides of a square field are 32 meters. A sprinkler in the center of the field sprays a circular area with a diameter that corresponds to a side of the field. How much of the field is not reached by the sprinkler? Round your answer to the nearest

18. ## Momentum

A ball with a mass of 0.5 kg is traveling at 25 m/s and collides with a ball at rest that has a mass of 2 kg. After the collision, both balls are traveling 5 m/s in the same direction. Was momentum conserved?

19. ## physics

In the figure below, 5.2 kg block A and 6.2 kg block B are connected by a string of negligible mass. Force A = (16 N) acts on block A; force B = (27 N) acts on block B. What is the tension in the string? (Express your answer in vector form.) To see the

20. ## Mathematics

A single cell divides in two every 5 minutes and each new cell continues to divide every 5 minutes. How long does it take for the cell population to reach at least 1 million?

21. ## math

Carmen is planning to invest \$2000 in an account earning 3.15% interest, compounded quarterly, for 5 years. He used the following formula and variables to solve for the future value of the account after 5 years. FV = PV(1 + i)^nt FV = Future Value PV =

22. ## Physics

A 300 g block on a 54.0 cm -long string swings in a circle on a horizontal, frictionless table at 85.0 rpm . What is the speed of the block? Express your answer with the appropriate units. What is the tension in the string? Express your answer with the

23. ## Math

Part C Two days later, Kelly surveyed the same 13 classmates and found that none of them had been given math homework since she last surveyed them. By how much does the mean of Kelly’s second data set change in comparison with the mean of the data set in

24. ## Social Studies

What is the answer to crossword puzzle week 22?

25. ## History

What happened to airplane manufacturing after World War II? 1 Airplane manufacturers began producing goods for the oil industry. 2 Airplane manufacturing rebounded and produced airplanes, parts, and equipment. 3 Airplane manufacturing decreased in Texas as

26. ## Math

A landscape architect submitted a design for a triangle shaped flower garden with side lengths of 21 feet, 37 feet, and 15 feet to a customer. Explain why the architect was not hired to create the flower garden.

27. ## Physics

A 10,000 kg railroad car traveling north at 10 m/s collides with a 5,000 kg rail car also moving north but at an unknown speed. After the collision, the two cars lock together and move north at 8 m/s. How fast was the second car moving before the impact?

28. ## Math

Tell which number is prime: 15, 23, 45, 51.

29. ## Chemistry

I need ho design an experiment on the dissolution of NH4NO3 in water. My independent variable is the amount of solvent (water) while my dependent variable will be the difference in temperature before and after the reaction. What could the hypothesis and

30. ## Math

The volume of a cylinder varies jointly as the height of the cylinder and the square of its radius. If the height is halved and the radius is doubled, determine the effect on the volume.

31. ## Trigonometry

Someone please help me!!! I think I've found the correct formula for this but I don't understand exactly why this is a sine function and how to find the days of the year when Portland has 11 and 15 hours of daylight. PLEASE HELP!! The equation I got was: D

32. ## Conditional Probability

Please refer to the illustration at screenshotsfirefoxcom/jZoizoMJf8a3H0UZ/ds055uzetaobbcloudfrontnet to help answer the following question: Zeb's coin box contains 8 fair, standard coins (heads and tails) and 1 coin which has heads on both sides. He

33. ## Math / geometery

A science museum has a spherical model of the earth with a diameter of 6.5 m. What is the volume of the model to the nearest cubic meter? Show your work.

34. ## MATH

Solve the equation using completing the square method x^2-6x+9 Please I need your solutions

35. ## Trigonometry

a 10ft ladder is resting against the wall. the ladder touches the ground 6ft away from the wall. what angle, rounded to the nearest tenth, id the bottom of the ladder making with the ground The correct answer is 53.1 degrees Can someone explain how to get

36. ## Physics

In a closed system where kinetic, potential, and thermal energy are changing, the kinetic energy decreases by 54 J, and the thermal energy increases by 13 J. What is the change in the potential energy?

37. ## Science

Why can't we use static electricity to accomplish certain things, such as activate or charge an electric instrument?

38. ## math

the base if a jewlery box is covered with 120 square tiles that are 1 cm on each side. if the volume if the box is 600 cm what is the height of the box? a. 2cm b. 5 cm c. 10 cm d. 480 cm

39. ## LA

The Pacific islands formed by coral reefs are called volcanic ----- reefs atolls plates pls help

40. ## Physics

A 20 kg chair has 250 J of potential energy relative to the ground. If the chair is dropped from its position, what is its speed when it strikes the ground?

41. ## Maths

In a class of 45 students, 24 do arts, 20 to chemistry and 22 to biology. All the students do at least one of 3 subjects.3 do all the 3 subjects while 7 do art and biology, 6 do art and chemistry but not biology. How many do biology only, chemistry only or

42. ## maths

a car travels 42 km on 6litres of petrol how far will it travels on 7 litres

43. ## Physics

A 10 kg bowling ball sits at the top of a 10 m hill and then slides down its icy hillside. a. What is the speed of the bowling ball when it reaches the bottom of the hill? b. What is the change in kinetic energy of the system as the bowling ball travels

44. ## Maths

Factorise x^4-x^2y-6y^2 Thanks to whoever solves it

45. ## Physics

A car is traveling horizontally at 15.0 mph; raindro ps have a speed of 20.0 mph with respect to the car. A passenger in the car notices the rain is slanted at 30 ° from vertical toward the back of the car. Find the velocity of the rain with respect to

46. ## math

the base if a jewlery box is covered with 120 square tile that are 1 cm on each side. if the volume of the box is 600 cm, what is the height of the box plz help

47. ## Mathematics

If 2^x = t, express the following in terms of t: a. 2^2x+1 b. 2^1-x

48. ## Physics

Calculate the magnitude of the change in momentum in each of the following examples. A 1,200 kg car accelerates from rest to a speed of 20 m/s. A 75 g pellet moving at 18.0 m/!@#\$%^&s a tree and lodges in it. A 250 g rubber ball hits the floor at 10.0 m/s

49. ## Social Studies

What best defines Manifest Dynasty? Plz help

50. ## Physics

A 3,000 kg truck is traveling 28 m/s through a rainstorm. At the end of its journey, it has collected 500 kg of water and is now moving 24 m/s. Was momentum conserved?

51. ## Momentum

A car and an attached trailer have a combined mass of 3,000 kg. The car and trailer are moving on the highway at a velocity of 25 m/s. After going over a small bump in the road, the trailer detaches from the car. If the car’s speed after separation is 27

52. ## chemistry

At 90C the following equilibrium is established H2(g) + S(s) = H2S(g) Kc= 6.8x10^-2 If 0.17 moles of H2 and 0.4 mole of Sulfur are heated in a 1L vessel up to 90C, what will be the partial pressure of H2S at equilibrium? Dr. Bob, first is 0.32 atm correct?

53. ## Mathematics

In a simplex problem, if the most negative integer lies in the column of slack variables, can that column be used as pivot column?

54. ## Algebra

Hi, can someone please walk me through this? I forgot how to do this and I lost my notes about it from last year Audrey deposited \$2,800 in a savings account that pays 2.65% interest compounded annually. What is the total value of the account after 7

55. ## Math

Becky used 5 teaspoon mustard to make 32 ounces of potato salad how many teaspoons of mustard does she need to make four pounds?

56. ## physics

2.0kg of water at 0 degree celsius is to be changed into ice at this temperature. The same mass of water now at 100 degree celsius is to be changed into steam at this temperature. specific latent heat of fusion of water= 3.34 x10^5 J kg^-1. specific latent

57. ## science

A driver takes off with a speed of 10m/s from a 5m high diing board at 30° above the horizontal how much later doesh she strike the water A rescue plaNe carries a package of emergency supply to be dropped at a point that is very close to a target the

58. ## Physics

Two positive charges q1 and q2 fixed to a circle. At the center of the circle they produce a net electric field that is directed upward along the vertical axis. Determine the ratio q2/q1. Angle for q1 is 30 degrees from diameter. Angle for q2 is 60 degrees

59. ## Trig.

Given sin ∅ 3/5, find a, the other angle in the right triangle The answer is 30,60,90 How is this someone explain?

60. ## Physics

The coefficient of kinetic friction between a rubber tire and a dry concrete road is 0.700. What is the distance in which a car skid to a stop on such a road if its brakes are locked when it is moving at 60 km/h?

61. ## physics

Somebody please shows me step by step to the answer key for part b. I got stuck at it for days The answer key is .126yr but my answer is .687yr. It looks easy but it is not. This what I have done-->I plug in the values that I find on google into the

62. ## AP Calculus

Find x. lim (sin(x))^x x-->0

63. ## math

In triangle XYZ, the length of side XY is 29 mm and the length of side YZ is 43 mm. Which of the following could be the length of side XZ?

64. ## math

The distance between Spice island and Kay Island is 3.4 inches on a map. If the scale on the map is 1 inch = 25 miles, what is the actual distance between the two islands. Options: A : 28.4 miles B : 75 miles C : 85 miles D : 850 miles. PLEASE help me.

65. ## Literature

I am confused in how hellen keller and minnie riperton correlate with the poem "here" by aracelis girmay. So can someone please help me understand that? Thank you (:

66. ## Math

Two limo companies are represented by the equation and table below. If you're renting a limo for 8 hours which company is cheapest? What is the cost? y=50+30x x= 1 2 3 4 y \$100 \$125 \$150 \$175

67. ## Calculus

The base of a solid in the region bounded by the graphs of y = e^-x, y = 0, and x = 0, and x = 1. Cross sections of the solid perpendicular to the x-axis are semicircles. What is the volume, in cubic units, of the solid? Answers: 1)(pi/16)e^2

68. ## math

Steve is participating in a cross county bike race. Every 2 hours he travels between 42 and 54 miles. Four hours ago, Steve had traveled 56 miles from the start of the race. Which is a reasonable measure of Steve's distance from the start of the race now?

69. ## Trig

Last question! Just seeing why I’m getting these wrong In a right triangle with a leg of 4 and a hypotenuse of 8, find the measure of all angles. Correct answer: 30deg, 60deg, 90deg How?

70. ## centennial

The owner of a residential building lot has received two purchases offers.Mrs A is offering a \$20,000 downpayment plus \$40,000 payable in one year.Mr B's offer is \$15,000 downlayment plus two \$25,000 payment due one and two years from now.Which offer has

71. ## Chemistry

A 25cm aliquot of ammonium iron 2 tetraoxomanganate 7 containing 39.2g of its salt in 250cm solution, needed 25cm of potassium tetraoxomanganate 7 solution for a colour change to occur. What is the concentration of the potassium tetraoxomanganate 7

72. ## MATH

Evaluate Un=(-)^n n+1/2

73. ## Science

Can someone check my answer? ____ is anything that has mass and volume. My answer: matter. Is that correct?

74. ## Maths

The Random Variable X is normally distributed with mean 560 and standard deviation 20. Find P(X

What annual effective dose equivalent to the lungs would you receive from 210Po by smoking one pack of cigarettes per day? Calculate this first analytically; then modify the Stella lung model provided to perform the same calculation and compare. Define any

76. ## Math

Start at 500 create a pattern that subtract 4 from each number stop when you have 5 numbers

77. ## Sociology

In your everyday choices, whom do you tend to take as a reference point? Your peers? Others? I don't need the question answered, I just need someone to define "Reference point".

78. ## Math

Solve for x. x/4=3/8 A) 2/3 B) 3/2 C) 3/32 D) 7/8 Not good with fractions. Umm...d?

79. ## Science

You will be designing and carrying out your own experiment to investigate the effect different forces have on an object’s motion. The experiment you design should test at least one of the forces that affect motion that you have learned about in this

80. ## Math

Jorge's current hourly wage for working at Denti Smiles is \$12.00. Jorge was told that at the beginning of next moth, his new hourly wage will be an increase of 6% of his current hourly wage. What will be Jorge's new hourly wage? If someone could explain

81. ## intro to court suystems

Community prosecution stresses the need for the prosecutor to reach out to the community, but what does “community” mean? Is this reform based on a naïve assumption that all members of the same geographic entity share similar views? How might

82. ## Math

A survey about the Student Government program at a school finds the following results: 190 students like the program 135 students think the program is unnecessary 220 students plan on running for student government next year. If a circle graph were made

83. ## Math / geometery

you're given two congruent angles what property can we use to justify the triangle similarity? Answer is AA postulate ??

asked by am i correct ?
84. ## Language Arts

President Lincoln’s Declaration of Emancipation, January 1, 1863" by Frances E. W. Harper 1 It shall flash through coming ages, 2 It shall light the distant years; 3 And eyes now dim with sorrow 4 Shall be brighter through their tears. 5 It shall flush

85. ## LA

which of the following sentences contains a pronoun in the nominative case? A. We packed bags for a trip to the beach. B. Our bags are decorated with beach balls. C. Hand him the bags and Mark will load the car. D. His car is packed full! Please Help God

86. ## math

for math test ncca/ equations and inequal

87. ## Science

Because the tilt of Earth's axis always points in the same direction, the seasons in the Northern and Southern Hemispheres are always _______ Options: A : Same B : Opposite C : three months apart. D : six months apart. PLEASE HELP ME ASAP

88. ## Math

When baking a cake, you have a choice of the following pans: a round cake pan that is 2 inches deep and has a 7 inch diameter a 6 inch × 9 inch rectangular cake pan that is 2 inches deep a. Which of these pans has the larger volume? Justify your answer.

89. ## Physics

Thank you Damon for answering my other question.. I appreciate... The distance between two successive crests of a water wave travelling at 3.6m/s is 0.45m. Calculate the frequency of the wave?

90. ## Physics

A small spherical insulator of mass 6.53 × 10-2 kg and charge +0.600 uC is hung by a thin wire of negligible mass. A charge of -0.900 uC is held 0.150 m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical

91. ## Chemistry

Write a balance equation between ferous ammonium sulphate and kMNO4

92. ## Math

Suppose we are standing on top of a 300-ft tower and we are holding a shiny new penny.We do not hurt it down, for that would be dangerous and wrong! We toss it up at a velocity of 10 feet per second and then when it comes down it just happens to plummet to

93. ## Lang Arts

In Chapter 40, Sal receives the gift of a chicken from Ben. The chicken’s name is Blackberry. Explain the irony in Ben’s gift and the name that he gives it.

94. ## Maths

The Random Variable X is normally distributed with mean 560 and standard deviation 20. Find P(X

was is 13*13

96. ## Math

What is the rule for these numbers? 3 and 1 15 and 25 7 and 9 I am really stuck, please can someone help?

97. ## Physics

What is the change in momentum for a 5,000 kg ship in outer space that experiences no net force over a 1 hr period?

98. ## Calc 2

Find the volume of the solid whose base is the region enclosed by y=x^2 and y=2, and the cross sections perpendicular to the y-axis are squares.

99. ## math

if the product of five tenths and three tenths is subtracted from the sum of two tenths and six tenths what is the difference

100. ## Math

In economics, the demand for a product is the amount of that product that consumers are willing to buy at a given price. The quantity demanded of a product usually decreases if the price of that product increases. Suppose that a company believes there is a

101. ## Statistics

The Random Variable X is normally distributed with mean 560 and standard deviation 20. Find P(X

102. ## math

Sheets of canvas have been hung over the waiting lines to provide shade. Each canvas sheet is in the shape of a triangle with side lengths of 50 feet, 75 feet, and 75 feet. What is the area of each canvas sheet

103. ## chemistry

A 25 g gold nugget with an initial temperature of 60 °C is dropped into an insulated cup containing 100 ml of water initially at a temperature of 5°C. What is the final temperature after thermal equilibrium is established? Refer to Table 3.4 of the text

104. ## Physics

A constant net force of 20 N is applied to a 32 kg car, causing it to speed up from 4.0 to 9.0 m/s. How long is the force applied?A constant net force of 20 N is applied to a 32 kg car, causing it to speed up from 4.0 to 9.0 m/s. How long is the force

105. ## Math

Whats 5×12 Im so confused

106. ## Math

Last week meal walked on the treadmill for 13 1/4 hours she spent the same amount of time on the treadmill each day except for Sunday on Sunday she spent 1 1/4 hours walking on the treadmill how many minutes did Camille walk on the treadmill on Monday show

107. ## Language Arts

In an essay, explain how the alliteration in full fathom five helps convey the atmosphere of the poem. Think about where is the poem is set and what is described. Then, give two examples of alliteration in the poem, and describe how they add to the

108. ## ENGLISH

The music sounds beautifully. B) Run quick; otherwise, you will miss the bus. C) The boss is more happier today. D) I surely wish you would go.

109. ## math

Find the conjugate surd of the given surd square root 2 plus1