# Questions Asked onApril 15, 2017

A biker traveling at his usual speed can go from his house to work in 4 hours. When the weather is bad, he travels 6 miles per hour slower, and it takes him half an hour more. How far is his work from his house?

2. ## Physics

In an elastic collision, a 300 kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 4.90 m/s and that of the trailing car is 6.20 m/s.

3. ## Statistics

Suppose x is a uniform random variable with values ranging from 40 to 60. Find the probability that a randomly selected observation exceeds 54.

4. ## math

7​. If 60 ml of water contains 12% of chlorine, how much water must be added in order to create a 8% chlorine solution?

5. ## Trignometry

In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t-800) a. Which day have about 10 hours of daylight? b. How many days of the year have more than 10

6. ## Physics

Water flows into one end of a horizontal, cylindrical pipe at 2.0 m/s. The pipe then narrows until its diameter at the opposite end is only 1/3 of that at the beginning. (a) What is the flow speed at the narrow end of the pipe? (b) What is the pressure

7. ## Physics

2) Two point charges, Q1 = 5.00 nC and Q2 = -3.00 nC, are separated by 35.0 cm. (a) What is the potential energy of the pair? What is the significance of the algebraic sign of your answer? (b) What is the electric potential at a point midway between the

Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei (4He) from gold-197 nuclei (197Au). The energy of the incoming helium nucleus was 7.58

9. ## Linear algebra

please help :( Bob and Doug play a lot of Ping-Pong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the

10. ## Physics

You have a grindstone (a disk) that is 92.0 kg, has a 0.490-m radius, and is turning at 83.0 rpm, and you press a steel axe against it with a radial force of 25.0 N. (a) Assuming the kinetic coefficient of friction between steel and stone is 0.50,

11. ## Physics

A uniform rod of length L and mass M is held vertically with one end resting on the floor as shown below. When the rod is released, it rotates around its lower end until it hits the floor. Assuming the lower end of the rod does not slip, what is the linear

12. ## Math

Triangle LMN is similar to Triangle XYZ The scale factor of triangle LMN to Triangle XYZ is 2:5 what is the length of the zx

Bob and Doug play a lot of Ping-Pong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the next game, and

14. ## Chemistry

Calculate ΔG° for each of the reactions below in kJ. (a) Sn(s) and Pb2+(aq) (b) Cr(s) and Cu2+(aq)

15. ## Math

If you flip three fair coins, what is the probability that you'll get a head on the first flip, a tail on the second flip, and another head on the third flip?

16. ## Math

To study the efficiency of its new price-scanning equipment, a local supermarket monitored the amount of time its customers had to wait in line. The frequency distribution in the following table summarizes the findings. Find the standard deviation of the

In a two-digit number, the tens’ digit is 1 less than the units’ digit. If the digits are interchanged, the sum of the number obtained and the original number is 143. Find the number.

18. ## Wayne C C C

How much work does a 55-kg person do against gravity in walking up a trail that gains 720 m in elevation?

if m

20. ## Physics

An alpha particle (4He) undergoes an elastic collision with a stationary protactinium nucleus (231Pa). What percent of the kinetic energy of the alpha particle is transferred to the protactinium nucleus? Assume the collision is one-dimensional.

21. ## Physics

A horizontal beam of length 4 m and mass 7.0 kg has a mass of 2.0 kg and width 0.8 m sitting at the end of the beam (see the following figure). What is the torque due to gravity (in N · m) on the beam–block system about the support at the wall? (Enter

22. ## Physics

you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair. I just want to make sure is it 25J because you are only doing work if you are lifting it but walking with it isn't work because

23. ## math

6​. For his birthday party, Perry mixed together 3 gallons of Jackson’s fruit punch, and 2 gallons of Bonanza’s fruit punch. Jackson’s fruit punch contains 20% fruit juice, and Bonanza’s fruit punch contains 55% fruit juice. What percent of the

24. ## math

12.​ You has investments totaling \$8000 in two accounts: a savings account paying 5% interest, and the other a bond paying 8% interest. If the amount of interest after one year from both investments was \$600, how much did you invest in both accounts

25. ## Social Studies HELP

11. How does the climate of Southeast Asia vary among regions? a. the mainland is much hotter than the islands b. the mainland receives monsoons but the islands so not c. the islands are generally wetter than the mainland**** d. the islands have a

26. ## Statistics

Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from \$2.85 to \$3.84. Use the fact that the confidence interval for the mean is in the form x − E to x + E to compute the sample

27. ## MATH

Let f(x) = m1x + b1 and g(x) = m2x + b2 be two linear functions. Answer the following, noting that answers may depend on the the ms and bs. a. Is f (x) + g(x) a linear function of x? b. Is f (x) − g(x) a linear function of x? c. Is f (x) × g(x) a linear

28. ## Math

A cyclist won a bicycle race for seven consecutive years. His "winning" times and "victory" margins (time difference of the second place finisher) are given in the figure below. -Year------Time--------Margin ----------(h:m:s)------ (m:s)

29. ## Physics

A 9 kg block on a frictionless inclined plane at 40° has a cord attached to a pulley of mass 4 kg and radius 11 cm (see the following figure). (a) What is the acceleration of the block down the plane (in m/s2)? (Enter the magnitude.) (b) What is the work

30. ## Physics

A uniform rod of mass 2.0 kg and length 8.4 m is free to rotate about one end (see the following figure). If the rod is released from rest at an angle of 60° with respect to the horizontal, what is the speed (in m/s) of the tip of the rod as it passes the

31. ## algebra

A car is moving at the rate of 80km/h. the diameter of its wheel is 60cm. a, find the number of revolutions per minute that the wheels are rotating. b, find the angular speed of the wheels in radians per second.

32. ## math

How write an equivalent expression to the expression (17*93) / (17*97)

33. ## Mathematics

A mother is 33 years older than her twin children. In 3 years her age will be twice the combined ages of the twins. How old are the twins now?

34. ## calculus

Find the exact length of the curve. x=(y^4)/8+1/(4y^2), 1 ≤ y ≤ 2.

35. ## Physics

A wheel has a constant angular acceleration of 2.5 rad/s2. Starting from rest, it turns through 200 rad. (a) What is its final angular velocity (in rad/s)? (Enter the magnitude.) (b) How much time elapses (in s) while it turns through the 200 radians?

36. ## algebra

Please correct my work. Using long division,simplify (8b^3-6),devided by (2b-1) My solution is: 4b^2+2b+1 ---------------- 8b^3 -6 8b^3-4b^2 ----------------- 4b^2-6 4b^2-2b ------------------ 2b-6 2b-1 ------------------- -5

37. ## algebra

Find a formula in terms of k for the entries of A^k, where A is the diagonalizable matrix below. A= 5 -16 2 -7

38. ## algebra

Please correct,if necessary, and simplify using long division: (-72-4x^2+8x^3-36x) devided by (x-3). My solution: 8x^2+20x+24 ------------------- 8x^3-4x^2-36x-72 8x^3-24x^2 ------------------ 20x^2-36x-72 20x^2-60x ----------------------- 24x-72 24x-72

39. ## Chemistry

lead(II)nitrate reacts with oxygen gas to produce diphosphorous pentoxide

40. ## math

p varies directly as the square of q and inversely as r when p=36, q=3 and r=4 calculate q when p=200 and r=2

41. ## English

Open ended question examples?

42. ## Chemistry

lead (II) nitrate reacts with oxygen gas to produce diphosphoroous pentoxide

43. ## Physics

Suppose that you place a square block of wood with dimensions 12.0 cm x 12.0 cm x 6.0 cm into some water as shown below. The wood has a density of 600 kg/m3. What is the distance from the bottom horizontal face of the block to the surface of the water? (In

44. ## chemistry

Calculate the concentration of Ca+2 in a saturated solution of Ca(OH)2 if the Ksp = 6.5x10-6 at 25oC. can someone explain the steps to do this please? :)

45. ## math

The area of the rectangle with length (x + 9) inches and width 6 inches is more than 72 square inches. Which inequality can be used to find x?

46. ## chemistry

zinc hyrdoxide + phosphoric acid --> zinc phosphate + water

47. ## Physics

you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair. I just want to make sure is it 25J because you are only doing work if you are lifting it but walking with it isn't work because

48. ## Caclulus

A particle is moving as given by the data below 4sin(t)-3cos(t); s(0)=0

49. ## English

Write the derivative. _____with other people's problem is a sign of kindness. (empathy) Choices: Empathy, Empathize, Empathetic, or Empathizing. answer: Empathizing

50. ## principles of economics

When the price of paper increases from ​\$250 to ​\$256 per​ ton, the quantity supplied increases from 250 to 270 tons per day. The price elasticity of supply is nothing . ​(Enter your response rounded to two decimal​ places.)

51. ## Computer program and design

Design a class called SimpleCalculator using psudoecode that contains public methods named add(), subtract(). Each of the methods accepts two numeric arguments and returns a number that represents the result of the appropriate arithmetic operation. Design

52. ## math

90 decreased by what percentage is 45.9?

53. ## math

1​. Write as a single power: 420 + 420 + 420 + 420

54. ## Physics

you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair. I just want to make sure is it 25J because you are only doing work if you are lifting it but walking with it isn't work because

55. ## Oob

an object moves from point p to q with an average speed of 60m/s and comes back from point q to p with an average speed of 144km/h . what is the average speed of whole journey in m/s?

56. ## math

If the time in months and the rate of interest per month are in the ratio 4 : 1, and the interest 16% of the principal, then what is the rate of interest? show all steps

57. ## math

How many seconds are there in 13.5% of 3 hours?

58. ## Caclulu

consider the function f(x) = 9/x^3 -10/x^7 let F(x) be the antiderivatice of f(x) with F(1)=0 then F(x)=

59. ## Calculus

Consider the equation xy2 − x2y = 6. (a) Find all points on the graph when x = 2. (b) Find a formula for dy dx in terms of x and y. (c) Find the tangent lines for the points you found in the ﬁrst part

In a two-digit number the tens’ digit is 3 more than the units’ digit. The number itself is 17 times the units’ digit. Find the number.

61. ## math

Suppose x can be expressed as a function of y by x = 5x − 3. a. How can y be expressed as a function of x? b. What is the relationship between the slopes of the two linear equations? c. How do the x-intercepts and y-intercepts of the two equations

62. ## math

Suppose that a sum of money at simple interest becomes \$840 in 1 year and \$960 in 4 years. What is the principal?

63. ## chemistry

what's the difference between experimental estimate of sugar concentration and the true sugar concentration?

64. ## math

integral of ((1+sin(2x))^0.5)/(sin(x)^2) I tried all kind of substitution, simplification but unable to solve it.Need a hint only no solution please.

65. ## English

Write the derivative. Urgent care doctors use a variety of methods to determine a patient's ______. (sentient) Choices: sentient or sentience Answer: sentience

What does an open ended question look like?

67. ## value

5/8 the number of boys in a school.if there are 240 girls.find the number of boys?

68. ## math

A \$10, 000 loan advanced on May 1 at 8 1⁄4 % requires two payments of \$3000 on July 15 and September 15, and a third payment on November 15. What must the third and final payment be in order to settle the debt?

69. ## pre calc

solve the given equation cos(θ) − sin(θ) = 1