# Posts by don

Total # Posts: 598

1. ### physics

A box is pushed a distance of 2 m with a force of 20 N. How much work is done on the box?
2. I think the first one is 0<Sdelta<or =to 2 b)? c)?
3. ### Calculus

Let f(x)= (x^2 -4)/(x-2) and note that lim as x approaches 2 , f(x)=4. For each value of E, use a graphing utility to find all values whenever 0<|x-2|< delta . looks like an S. a) e=2 b) e=1 c) For any e>0, make a conjecture about the value of delta S that satisfies ...
4. [A] 0.01 0.02 0.01 [B] 0.02 0.02 0.04 Rate(mol l^-1 S^-1) 0.0005 0.0010 0.0020
5. ### CHEMISTRY

A(aq) + B(aq) + C(aq) ? D(aq) [A]. [B]. Rate (mol) 0.01 0.02 0.0005 0.02 0.02 0.0010 0.01 0.04 0.0020 Determine : a) The order of the reaction of each reactant b) The rate law c) The rate constant K, Using result from experiment 1. Please working answers please
6. ### Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?
7. ### Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?
8. ### Physics

Jason while driving on Kukum highway at 70 m.s – 1 seeing the traffic light turn red, he applies the brake and comes to rest in a time of 2 seconds. What is his deceleration?
9. ### Math

How do you write ln(n) in log form? I know that you can convert log of some base by doing ln of the variable over ln of the base, but I don't know how to do the opposite.
10. ### math

Anna has \$15 more than Lala does. If I gave Lala \$60, she will have three times as much as Anna. Find how much Lala has at the first place?
11. ### probability

the probability of winning a carnival game is 15%. Elaine plays 10 times. find the probability that Elaine will win 2 times.
12. make an equation to find out the cost of 7 apples
13. 5 apples cost =7 kg costs of apples. Cost of 7 apples = x. Find out 7 apples cost?
14. ### math

5 apples costs 7 kg. Let x be the cost of 7 apples, make an equation to find out the cost of 7 apples
15. I would tell that friend that when he or she denies that there is a conflict he or she will make things to be more difficult and that conflict won't be solved which will lead to a negative relationship which will cause commotion or unnecessary fights so advise that friend ...
16. ### Algebra

Six times a number less ten is equal to two times the same number plus four.
17. ### Finance

Ron starts with a \$100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?
18. ### Finance

Ron starts with a \$100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?
19. Please, Damon, I need the rule write in Formulas.
20. ### Maths

Four numbers 2, -3, 5 and -7 are arranged in a pattern as shown. 2, -3, 5, -7, 2, -3, 5, -7, 2, -3 .......... what is the 2005 number?
21. ### easy math

What value of c makes x^2 + 6x + c a perfect square trinomial? 3 6 9 12
22. ### easy Math

A soccer ball is kicked upward from a hill and then falls to the ground. The height, in feet, of the ball after t sec is modeled by the function h(t) = –16t2 + 26t +12. What is the initial height of the ball? –16 ft –12 ft 12 ft 22 ft
23. y: T cosq - mg = may = 0 x: T sinq = mac = mv2/r [T sinq]/[T cosq] = tanq = [mv2/r]/[mg] = v2/gr. Then, v = [gr tanq]1/2 = 25.9 m/s
24. ### Math

Bakery salary \$24,000 Kitchen salary \$26,000 Catering salary \$30,000 Bar salary \$30,000 Server/host \$25,000 What department has the largest difference between the highest and lowest employee
25. ### Math

Number of employees in Kitchen is 2 Salary is \$52,000 Avg. cost of employee 26 If the avg. cost per salaried employee increase by \$4,000 in the kitchen department, what is the new average cost per employee in the department
26. ### Language

What word means the opposite of offensive Affable Zealous Acclivitous Intimate Synergetic
27. ### Math

Start at 5. Create a pattern that adds 3 to each number. Stop when you have 5 numbers.
29. I believe South, but I could be wrong.
31. Never mind. I figured it out. I'm not trying to be rude.
32. Are you there?
33. Microsoft
34. ### Technology

To insert clip art into a document, what step should I take immediately after i find the clip art I want to insert? a. Use scroll bars to view more choices of clipart. b. Click on the clip art image. c. Click on the clip art button. d. Click insert tab at the top of the screen...
35. ### Math

100(1+100) Example : 1+2+3+…+100= ----------- 2 Simplify: (x+1) + 2(x+1)+ …+1000(x+1)
36. What you want to do is cross multiply since 2/3 = 6/x, when you cross multiply, you get 2x=18 x=9 2:4 = 1:2 so you can just double 6 or 2/4 = 6/x 2x=24 x=12 Therefore the perimeter of the triangle is 6+9+12 Answer: 27
37. ### English

It is not from the benevolence of the butcher the rewer, or the baker, that we expect our dinner, but from their regard to their own interest.
38. ### math

If you place \$2,000.00 in a saving account with an interest rate of 4.5% month versus an account with a rate of 3.75% month, how much more interest could you earn in that month using the first account?
39. S**t.... Not proper
40. Okay I'll try I hope I don't make a bad grade
41. Then 4,5,6... I just need to get the understanding of how t do them
42. Okay I'll show my steps. 2. Yeah I see D is wrong now. I say B.... 7x2=14 3. I still don't know that one cause I need a little more help
43. Oh sorry. 1.C 2.D 3 Idk. 4.C 5.A 6.D Am I right

1. Which of the following shows how this expression can be simplified? 2x + 6 + 3x − 4 A. x − 2 B. x + 2 C. 5x + 2 D. 5x − 2 2. Which is equivalent to the expression below? 7(2p − 1) A. 7p B. 14p − 1 C. 14p − 7 D. 14p − 8 3. Factor ...
45. 6. A 20 ft. beam leans against a wall. The beam reaches the wall 13.9 ft. above the ground. What is the measure of the angle formed by the beam and the ground?
46. a= -25.67 and d= 0.28
47. ### FIN 301

1. Cliff Arthur has equally attractive job offers in Miami and Los Angeles. The rent ratios in the cities are 8 and 20, respectively. Cliff would really like to buy rather than rent a home after he moves. Explain how to interpret the rent ration and what it tells Cliff about ...
48. ### Physics

a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job
49. ### physics

Show that the kinetic energy of two particles with mass m1 and m2 split into the energy of the centre of mass and the kinetic energy of relative motion.
50. ### physics

A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?
51. ### English LAST 1. (:

It's about MLk I Have A Dream speech. Why does King use the rhetorical technique of parallel structure in his speech? A)to show that he is aware of the time that has passed B)to show that others are not aware of the time that has passed C)to show that two or more ideas ...
52. thank you :-)
53. ### English **One Question**

In a sense we have come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to fall heir. This note...
54. correct ans &798.25
55. \$643.75
56. ys
57. This is similar to what I just answered earlier. x = total cost y= # of motors bought 150 = x*y solving for y: 150/y= x <--- (1) now we know: 150=(x-2)*(1+y) <--- (2) substitute using (2) and (1) we get : 150=((150/y)-5)*(1+y) 30 = y^2+y y^2+y -30= 0 (y+6)(y-5)=0 y = -6...
58. Sorry, made an error. once you complete the square: (y+10)^2 = 3600 solving for y gives you 50 so 50 calculators. you could also used the quadratic formula to solve for y and get the same answer.
59. x=cost of calculator y=number of calculators 350=(x-2)*(20+y) <-- equation 1 we know that total cost = cost per calc * number of calc bought 350 = x*y so 350/y = x <-- equation 2 we can substitute x from equation 2 into equation 1 350=((350/y)-2)*(20+y) solving this you ...
60. You will have two roots (two answers).
61. reciprocal means 1 over the number x + 1/x = 29/10 solve for x to get your number
62. Momentum formula: p=mv where p=momentum m = mass v= velocity p/m = v once you solve for v now apply: v^2=v_i + 2*g*h v=what you got from momentum v_i = starting speed = 0 g= 9.81 h=?????
63. Beth's time = 7.8 seconds Amy = 7.8 -2.5 = ???
64. conservation of momentum.. (1/2)*m*v = (1/2)*m2*v2 m = 3 v = ?? <-- speed of spitball m2 = 40 + 3 = 43 (added the sum because assuming that the spitball sticks to the carton, that's the total mass) v2 = .3 solve for v
65. Conservation of momentum problem since system is a rest before firing 0 = m1*v1 + m2*v2 everything is given in problem besides v1 So solve for v1
66. Another conservation of momentum problem m1*u1+m2*u2 = m1*v1+m2*v2 m1 = 250 = .25kg u1 = 1.5 m2 = 4 v1=.89 solve v2
67. Is there a figure that comes with this?
68. Area of a square: A=s^2 You are given the area so: 160=s^2 solve for s So I agree with your answer.
69. F=ma where a=9.81m/s^2 (gravity) solve for m now use the formula: (1/2)m*v^2 + m*g*h = m*g*h2+(1/2)*m*v2^2 m=755 v=0 h=10 (starting height) h2=0 (final height) v2 = ?? this is what we're trying to find. try to solve for v2 given the equation.
70. For constant velocity: F = μk*W
71. I'm guessing it depends on the direction of the magnitude. if both are positive |3+4|=7 if one is negative |-3+4|=1 if the other is negative |3-4|=1 So considering all the possibilities, it can't be anything besides 7 and 1
72. Could you post the whole question? From what's given, there are lot of questions you can ask from that statement.
73. Given: 96 calories in a 3/4 cup serving We need to find out how many calories in 5 cup. Solution: Set up a equation for the ratio of calories to cup serving. 96/(3/4) = x/5 Solve for x to get your answer
74. ### Market Research

Let N  6 and n  3. For purpose of studying sampling distributions, assume that all population values are known. Specically, y1  98, y2  102, y3  154, y4  133, y5  190, and y6  175. We are interested in yU, the population mean. Two ...
75. Ah, that is true! at 12 minutes he did climb 12 meters and it took him another .45 seconds to climb the rest. Wow, I completely neglected some stuff here. Thanks for clarifying Steve!
76. Hmm… The wording in this problem is a little tricky to me, so I'm assuming that its an alternating pattern (poor monkey). For the first minute the monkey is at 4 meters For the second minute monkey is at 2 meters ( because he slips down) So basically every 2 minutes, ...
77. I guess this is a calculus problem. When I drew this out, I got a right triangle x = length the foot is from the wall = 4 6 = length of ladder = hypothenuse h = unknown height of wall dx/dt = .5 m/sec use pythag theorem to find h: x^2 + h^2 = 6^2 4^2+h^2 = 6^2 h =4.47 Now find...
78. w w w.physicsclassroom. com/class/1DKin/Lesson-1/Scalars-and-Vectors
79. First break your vector up into x and y components. Since its angled at 30 degrees with the horizontal, the x component with have cosine in it and sin for the y component. x component = 170cos30 y component = 170sin30 where y is your vertical component.
80. Number of periods = 20 Years * 2 (periods per year) = 40 PV= \$1600 i/2 = 13.5%/2 = 0.0675 FV = ? = PV * (1 + i/2)^N = 1600 * (1 + 0.0675)^40 = \$21,819.02
81. g + 3 > 6 move 3 to right side g > 3
82. Did you draw the free body diagram first?
83. Look at the original equation: 6x^3 + 12x^2 + 4x + 8 You can factor a 2 out of the whole equation: 2(3x^3 + 6x^2 + 2x + 4) Now try to factor inside of the parenthesis: How I factored it was I just did trial and error lol, I just takes some practice, when once you get good at ...
84. Total number of socks = 6+4 = 10 For the first pull: There are 6 purple socks out of 10 total socks 6/10 At his second pull, lets assume that he luckily pulled a purple sock out There are now 9 socks total because he pulled one out, and 5 purple socks left because we assumed ...
85. m = (-2-(-5)5)/(6-1) should be m = (-2-(-5))/(6-1) m = 3/5
86. Also, for the first question the answer is y = 0*x - 3 I think you just made a typo
87. To find the equation for a line we use the formula Y = mx+b where m = the slope where b = the intercept So you are given two points (1,5), (6,-2) You first need to find the slope of that line: m = (y2-y1)/(x2-x1) m = (-2-(-5)5)/(6-1) m = 3/5 <---- slope now that you have ...
88. 20/25 = F/50 F = (20/25)*50 F= 40 N
89. No need for gravity. F1/Area1 = F2/AREA2 Solver for F1
90. They key thing you need to know is what the center of mass formula is. Center of mass: (m1*x1+m2*x2)/(m1+m2) So at initial center of mass: (86*9+55*2)/(86+55) = 6.27 m So now do apply the same equation when they switch position: (55*9+86*2)/(86+55) = 4.73 m So now find the ...
91. How did you start this problem?
92. Just a quick question… Did this problem come with a figure? I can't tell if those angles are along the horizontal or vertical.
93. Veocity = distance / time You are given a distance of 40m and time of 1.9s
94. When doing these types of physic problems or actually any physics problem, write down what's given. m=57.5 kg v_f= 58.9 m/s v_i = 0 (because it was a rest, not moving) t = 14.4 s g=9.81 m/s^2 The apparent weight is: W = F + m*g F=ma Everything is given to us in the problem...
95. I almost agree with Aaliyah. Expressions do not need an equal sign so you can just write: 2m+7 but everything else that Aaliyah has posted is on point.
96. Set this up as a system of equation then solve: x = chalk y = stapler x+2y = 10 <--- equation 1 3x+2y = 18 <---- equation 2 Now, there are many methods when solving systems of equation, but I would use substitution method for this problem. Look at the first equation: x+...
97. Actually after reading the problem, I think I rounded wrong. 338700 should be the correct answer.
98. Set up an equation then solve: 320000 = x - x*(.055) where x is the amount they must sell their house for minus the 5.5 interest rate and still maintain 320000 x = 338624 But it says to round to the nearest \$100, so x = 338600
99. Whoops, I think my units are off because since k is measured in N/m I need to convert cm to m Answer should be .03 Joules
100. Potential Energy of the compressed string at x=3.0cm: W = (1/2)*k*x^2 where k = spring constant = 15 N/m x = distance = 3.0 cm W = (1/2)*15*3^2 W = 67.5 Total work: W_t = (1/2)*k*x^2 where x = 4+3 = 7 W_t= (1/2)*15*7^2 W_t = 367.5 W_t - W = 367.5 - 67.5 Work needed for the ...