beth

Newest questions and responses by beth
1. chemistry

A 0.850 m aqueous solution of KBr has a total mass of 66.0 g. What masses of solute and solvent are present?

2. Physics

Find the size of the net force produced by a 4 N and a 14 N force in each of the following arrangements. (a) The forces act in the same direction. N (b) The forces act in opposite directions. N (c) The forces act at right angles to each other. N

3. Physics

Find the size of the net force produced by a 4 N and a 14 N force in each of the following arrangements.

4. Physics

The gravitational force between two very large metal spheres in outer space is 57 N. How large would this force be if the mass of each sphere were

5. Physics

What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m?

6. Physics

The planet Mars has a radius of about 0.53 Earth radii and a mass of only 0.11 Earth masses. Estimate g on Mars.

7. Physics

If you were located halfway between the Earth and the Moon, what acceleration would you have toward Earth? (Ignore the gravitational force of the Moon as it is much less than that of the Earth.)

8. Physics

If the rotational speed of a CD changes from 650 rpm to 250 rpm as it plays 30 minutes of music, what is the CD's average rotational acceleration?

9. Physics

What is the rotational speed of the minute hand on a clock?

10. Math

Four years ago, Danielle was 2/3 as old as Jim was. Now she is 3/4 as old as he is. How old is each now?

11. Calculus

An airplane flies at an altitude of y = 5 miles toward a point directly over an observer. The speed of the plane is 500 miles per hour. Find the rates at which the angle of elevation θ is changing when the angle is θ = 45°, θ = 60°, and θ = 80°.

12. Chemistry

What volume of a 0.125 M solution of NaOH is needed to neutralize 25.0 mL of a 0.285 M solution of HCL

13. math

what is 8x2x4?

14. Math-Geometry

Starting from the point (0,0), a grasshopper makes a series of moves on the coordinate plane. The grasshopper's first move takes her to (3,4). She then proceeds via this rule: Move Rule: After a move which adds (x,y) to the grasshopper's coordinates, her

15. Chemistry

Does SO2 also make Ca(OH)2 milk white in colour, like CO2?

16. Math

If Vr=[sin(B/2)]*{cos[A+(B-1)r],how do we write Vr in the form, Vr=f(r) - f(r-1) ? Thank you!

17. Chemistry

We are asked to find the pH of a buffer solution of Dinitrophenol and NaOH,with the necessary data given. Do they react at 1:1 ratio? What would be the products?

18. Corporate Finance

Jason's opportunity cost rate is 8 percent compounded annually. How much must he deposit in an account today if he wants to receive \$5,400 at the end of each of the next 10 years? Use a financial calculator to determine the amount to be deposited today.​

19. Math

Suppose you have 5 marbles in a bag: 3 red and 2 black. If you reach into the bag without looking and randomly pick out two marbles, what is the probability that both marbles are red?

20. Math 120

The results of a certain medical test are normally distributed with a mean of 128 and a standard deviation of 19. ​(A score above 140 is considered​ unhealthy.) Use the given table to find the percentage of people with readings below 137.

21. programming

Describe use cases for a department store credit card system. Name at least two actors and four use cases. Do not do a diagram, just write it up by giving a name for each use case, a brief description of the use case and name the actors involved.

22. Calculus - Integrals

Consider the region enclosed by the graphs of x=y^2-5 and x=3-y^2 a)Express the area of this region by setting up an integral with respect to x b) Express the area of this region by setting up an integral with respect to y c) Find the area of this region

23. Math 120

A construction company is planning to bid on a building contract. The bid costs the company \$1800. The probability that the bid is accepted is 1/5. If the bid is accepted, the company will make \$46,500 minus the cost of the bid A) what is the expected

24. Math 120

You are dealt one card from a​ 52-card deck. Find the probability that you are not dealt an ace.

25. Pre calc

A water tower is located x = 375 ft from a building (see the figure). From a window in the building, an observer notes that the angle of elevation to the top of the tower is 39° and that the angle of depression to the bottom of the tower is 25°. How tall

26. Math 120

A die is tossed. Find the odds against rolling a number greater than 2 The odds against rolling a number greater than 2 are __ : ___

27. Math 120

A box contains 10 ​transistors,4 of which are defective. If 4 are selected at​ random, find the probability that a. All are defective. b. None are defective.

28. Math 120

The table shows the​ distribution, by​ age, of a random sample of 3990 moviegoers ages​ 12-74. If one moviegoer is randomly selected from this​ population, find the​ probability, expressed as a simplified​ fraction, that the moviegoer is not in

29. Math 120

A city council consists of eight Democrats and seven Republicans. If a committee of six people is​ selected, find the probability of selecting three Democrats and three Republicans.

30. Chemistry

When 22.50 mL of 0.500 M H2SO4 is added to 22.50 mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate ΔH of this reaction. (Assume that the total volume is the sum of the individual volumes and that the

31. Math

So far, you have used synthetic division and factoring to find x-intercepts. What additional information do you need to create an accurate sketch of the function ? How do you propose we find this information using the equation ?

32. Math

Use the remainder theorem to evaluate f(k), then determine if k is a factor. f(x)=10x^3-41x^2+32x+20; 5/2

33. math

A pilot estimates that 5/8 of the fuelin the planes tank will be used when the plane reaches its destination. The tank contained 42,300 gallons at take-off. How much fuel does the pilot expect to use?

34. Physics

The large disk-shaped flywheel illustrated below has a radius R of 0.25 m. It is made to spin by the small wheel that contacts it at its rim. The small wheel applies a constant force of 1430 N. Friction in the bearing exerts a retarding torque 22 Nm on the

35. Physics

A cube of ice, 28 cm on each side,is melted into a measuring cup. What is the volume of the liquid water -------cm^3

36. physics

A cube with a mass of 40 g is made from a metal with a density of 6 g/cm3. What is the volume of the cube and the length of each edge? ----volume cm^3 -----length cm^3

37. Physics

In physics, work is defined as the product of the A) net force and the distance traveled B) net force parallel to the motion and direction traveled C) net force parallel to the motion and the time it is applied

38. physics

A ham sandwich consists of one slice of ham (9 grams) and two slices of bread (25 grams each). You have 1 kg of ham and 1.2 kg of bread. You make as many sandwiches as you can. How many sandwiches did you make? 1) How many sandwiches? 2) What is the mass

39. math

If a car agency charges 240.00 per week to rent a car plus 0.25 per mile. How many miles can you travel in one week for 385.00

40. physics

Given that 1 g of hydrogen combines completely with 8 g of oxygen to form water, how much water can you make with 10 g of hydrogen and 24 g of oxygen?

41. physics

A 1400 kg car is traveling at 28 m/s around a curve with a radius of 116 m. What is the angular momentum of the car?

42. Chemistry

The principal quantum number (n): (1) specifies the subshell of the orbital. (2) specifies the principal shell of the orbital. (3) specifies the 3-D shape of the orbital. (4) specifies the maximum number of electrons. (5) none of the above

43. physics

The work that a force does by acting on an object is equal to what? 1) the product of force (in the direction of motion) and distance and is negative if the force and motion are in the same direction 2) the product of force (in the direction of motion) and

44. physics

When a force acts on an object from an angle other than either 0° or 180° to the direction of motion: 1) The force is perpendicular to the direction of motion, so no work gets done. 2) The parallel and perpendicular component of the force both do work.

45. physics

The work that a force does by acting on an object is equal to what? 1) the product of force (in the direction of motion) and distance and is negative if the force and motion are in the same direction 2) the product of force (in the direction of motion) and

46. physics

A 5 kg toy car with a speed of 6 m/s collides head-on with a stationary 1 kg car. After the collision, the cars are locked together with a speed of 5.00 m/s. How much kinetic energy is lost in the collision?

47. Chemistry

The principal quantum number (n): 1) specifies the subshell of the orbital. 2) specifies the principal shell of the orbital. 3) specifies the 3-D shape of the orbital. 4) specifies the maximum number of electrons. 5) none of the above

48. Chemistry

What happens to an atom when it absorbs energy? 1) The atom stores the energy for later use. 2) The atom re-emits the energy as electromagnetic radiation. 3) The extra energy increases the speed of the electrons in their orbitals. 4) The extra energy

49. Chemistry

Magnesium oxide can be made by heating magnesium metal in the presence of oxygen. The balanced equation for the reaction is: 2Mg(s)+O2(g)→2MgO(s) When 10.1 g of Mg are allowed to react with 10.5 g of O2, 14.5 g of MgO are collected. a) Determine the

50. Physics

You have a mass of 84 kg. How fast (in mph) would you have to run to have the same momentum as an 18-wheeler (m = 28,000 kg) rolling along at 1 mph

51. physics

You have a mass of 84 kg. How fast (in mph) would you have to run to have the same momentum as an 18-wheeler (m = 28,000 kg) rolling along at 1 mph

52. Chemistry

Calculations involving a limiting reactant Now consider a situation in which 20.0 g of P4 is added to 54.0 g of Cl2, and a chemical reaction occurs. To identify the limiting reactant, you will need to perform two separate calculations: 1) Calculate the

53. Chemistry

What is the maximum mass, in grams, of NH3 that can be produced by the reaction of 1.0 g of N2 and 1.0 g of H2 using the reaction below? N2+H2→NH3 (not balanced) What is the maximum mass, in grams, of that can be produced by the reaction of 1.0 g of and

54. Physics

A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy, be 4 seconds later? B) what will be the x and y displacements of the rock be 4 seconds later?

55. Physics

Al the astronaut has a weight of 1600 N when he is standing on the surface of earth. What is the force of gravity action on him when he is in space station orbiting earth at a distance of four earth radii from the center of the earth?

56. Physics

Angela and Paul are opposite ends of the 4.0 m long bar. Paul, whose mass is 78 kg feels attraction to Angela, whose mass is 55 kg. A: If the attraction is gravitational, how strong, in Newtons, is it? B: What are their individual weights?

57. Math

|x - 8|- 15 = -6 How do I solve this.. Please don't do it for me..

58. Math

3x + 9 = 7x - 11 How do I solve this? You said subtract three x from each side, then all eleven to both side then divide each side by 10? I'm confused...

59. Math

The equation of a line is -6x-2y= -18 What is the x-intercept of the line? -3 3

The equation of a line is -6x-2y= -18 What is the x-intercept of the line? -3 3

62. Chemistry

Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2Na(s) + Cl2(aq) → 2NaCl(s) 3. 2Mg(s) + O2(g) → 2MgO Identify the oxidation-reduction reactions among the following: 1 and 2 only 2 and 3 only 1

63. Physics

When an item has been launched into orbit, what happens? 1: It continues to fall but its path never reaches the ground. 2: Centripetal force from Earth's gravity keeps it from being accelerated toward Earth. 3: It no longer falls because the weakness of

64. Science

How many grams of sodium bicarbonate (NaHCO3) are needed to make a 0.6M solution?

65. Math

The union of sets P = {1, 2, 3, 4, 5, 6} Q = {4, 5, 6, 7, 8, 9} is given by which of the following? {1, 2, 3, 4, 5, 6, 7, 8, 9} {1, 2, 3, 4, 4, 5, 5, 6, 6, 7, 8, 9} ø {4, 5, 6}

66. Research Methods

Thinking of a survey you might design for a commercial client such as a software company or a restaurant, what are the ethical implications of using the survey results to publicize your own research firm? Looking forward to some ideas! Thanks!

67. Math

A flag has a length of 1 1/4 feet when the width is 1 2/7 feet. Write the ratio to the width as a fraction in simplest form.

68. Math

Consider an airplane headed N 60 degrees W at a speed of 400 mph. What wind direction at a speed of 75 mph will produce a resultant direction of N 50 degrees W?

69. Pre Calc

visually show on compass/vector graph n 60 degrees w at 400 mph, n 40 e at 75 mph

70. Pre Calc

Airplane going N 60 degrees W at a speed of 400 mph. What wind direction, at a speed of 75 mph will produce a resultant direction of N 50 degrees W

A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the acceleration of the crate? (Hint: remember to find net force first) a=6.00 m/s2 a=28.1 m/s2

A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the normal force? A. 480 N down B. 480 N up C. 2300 N down D. 2300 N up

A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. The forces acting on the crate are __________________. A. balanced B. unbalanced

74. Math

Help please. .6 is 266 2/3% of what number?

75. MATH HELP

Zoro Manufacturing Company manufacturers wooden picture frames. Each piece of wood yields 15 frames. Each piece of wood costs \$18.75. The direct labor charge is \$13.50 per hour. Sixty-five frames can be produced each hour. To the nearest tenth of a cent,

76. Math

I need help please. the mean distance of earth from the sun is 92,960,000 which is 258% of the mean distance of mercury from the sun. What is mercury’s mean distance from the sun in ten millions of miles?

77. Math

I need help please. the mean distance of earth from the sun is 92,960,000 which is 258% of the mean distance of mercury from the sun. What is mercury’s mean distance from the sun in ten millions of miles?

0.0293262879789 Rounded to nearest hundredth percent.

79. MATH HELP

Determine the annual dividend and the annual yield to the nearest hundredth of a percent. Joyce buys 350 shares of KOW, Inc, that has a high of 42.50 per share and a low of 23.60. Last year the company paid annual dividends of \$0.58 per share. (a) What is

80. MATH HELP

Determine the annual dividend and the annual yield to the nearest hundredth of a percent. Ella Franklin owns 325 shares of ITA stock. Purchase price was 37.85 per share dividends are 1.11 per share

81. MATH

Ben Garrison invested \$15,000 at 5% compounded daily in a credit union account that matures in 1 year. He also invested 20000 at 5.25% compounded monthly in a Silver Screen account that matures in 4 years. (a) What is the interest earned at maturity for

82. Math

May Wattson has 50000 to invest in a 4-year certificate of deposit that earns an interest rate of 3.75% compounded monthly or 3.50% compounded daily. Based on annual yield which is the better investment?

83. MATH

Mabel has \$35,000 to invest in a certificate of deposit for 4 years. The certificate of deposit earns interest at 4.75% compounded daily. What is the annual percentage yield to the nearest thousandth of a percent?

84. MAth

Tammy Smith Deposits \$5000.00 in First Internets Bank 5-year CD which pays 5.22% interest compounded monthly how much interest will she have in the account in 5 years?

85. Physics

Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west. a) Determine the magnitude and direction of the resultant

86. Math

Find the intervals on which the function is increasing, decreasing, concave up, or concave down and find any local extreme values and inflection points. So I know how to do the above, but not with piece wise functions. Someone help me out? Y={3-x^2, x=0} I

87. Physics

Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west. a) Determine the magnitude and direction of the resultant

88. Physics

Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west.

89. Intro to Paralegalism I

In what state a person may take the bar examination without a formal legal education?

90. calculus

It is estimated that t years from now, the value of a small piece of land, V(t), will be increasing at a rate of 1.6t^3/(0.2t^4+8100)^(1/2)dollars per year. The land is currently worth \$420. Find V(t) and also find the value of the land after 10 years to

In trademark term, what is acquiring secondary meaning?

92. Check My work ( math)

1.) Years: 1 2 3 4 5 6 7 8 Height: 2.1 3.2 6.8 7.3 11.2 12.6 13.4 15.9 about about tall would you expect these trees to be after 22 years ? a.)22.31 ft b.)35.2 ft c.)44.25**** d.)46.2ft 2.)temp:68 77 83 85 89 94 96 99 number of cones:403 447 457 465 489

93. buisness communication

Repeating in your own words the verbal content of the critic's message is: paraphrasing. checking for feelings. checking for inferences. buying time with limited agreement.

94. Math

y=arccos(sin(x)), find dy/dx. I got -1, is this correct? When I tried to check on wolfram alpha I didn't get this right.

95. Math

y=arccos(sin(x)), find dy/dx and sketch it's graph(I guess I can do this on wolframalpha after I'm done solving the question). And by arcsin I mean inverse of the expression(written like cos^-1(sin(x)), but is not 1/cos(sinx) but the inverse of cos). I am

96. Math

Write an equation for the tangent to the curve y=sinmx at the origin. I got y=mx, is this correct? Please help by showing work! Thanks

97. Math

If f(u)=u+1/(cos^2u) , u=g(x)=pi(x), x=1/4 , find the derivative of f(g(x)). I can't seem to get this one, step by step please?

98. Math

A line 'l' intersects line 'm' at point A at 45 degree angle. B and C are points on line m, where the distance from B to A is equal to the distance from A to C. How many points on line 'l' are equidistant from points B and C? How is it one point? And this