Popular questions and responses by Chad
1. ## physics

A block with mass m =7.3 kg is hung from a vertical spring. When the mass hangs in equilibrium, the spring stretches x = 0.21 m. While at this equilibrium position, the mass is then given an initial push downward at v = 4.5 m/s. The block oscillates on the

2. ## Math

An Adult male's heart pumps about 2.8 million liters of blood a year. If his heart beats 70 times a minute, how much blood does his heart pump with each beat? Show work

3. ## Physics

When you see a traffic light turn red, you apply the brakes until you come to a stop. Suppose your initial speed was 12.9 m/s, and you come to rest in 35.0 m. How much time does this take? Assume constant deceleration. What equation do I use to solve this

4. ## chemistry

A 8.60-g sample of solid CaSO4·2H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?

5. ## Physics

A rowboat passenger uses an oar to push the boat off the dock by exerting a force of 40.0 N for 3.0 s. What impulse acts on the boat? What formula do I use?

6. ## Math

On the leeward side of the island of Oahu, in the small village of Nanakuli, about 80% of the residents are of Hawaiian ancestry. Let n = 1,2,3.... represent the number of people you must meet until you encounter the first person of Hawaiian ancestry in

7. ## history

margin required to elevate a president's nominee to a seat on the Court

8. ## Physics

In the school cafeteria, a trouble-making child blows a 12.0 g spitball through a 25.0 cm straw. The force of her breath as a function of the distance along the length of the straw can be modeled as 10-50x^2-70x^3 where force is in newtons and x is in

9. ## Chemistry

A sample of 2-methyl-1-butanol has a specific rotation of -3.25°. Pure (R)-2-methyl-1-butanol has a specific rotation of +5.75°. Determine the %ee and molecular composition of the sample.

10. ## Math

Jennifer bought a brand new treadmill on a credit plan at BeFit Exercise Equipment. BeFit will charge her 15% per year compounded monthly. If her monthly payments will be \$150 for 4 years, how much was the original price of the treadmill? a) \$5,390.72 b)

11. ## Math

Deborah deposits \$200 into an account that pays simple interest at the rate of 7%. How much will she have at the end of 4 months? a) Present Value with simple interest b) Future Value with simple interest c) Future Value with compound interest d) Simple

12. ## chemistry

calculate[OH-],[H+] of a .20 M solution of triethylamine Kb=4.0*10^-4

13. ## chemistry

2NO2(g)⇌N2O4(g). ΔH∘f for N2O4(g) is 9.16 kJ/mol.

14. ## Math

Congratulations! You were the 10th caller on the KMTH morning show and you just won \$9,000.00. After you calm down, you decide to put the money into a bank account so that you will have even more money for a trip to Europe. Snurling Bank tells you that

15. ## Physics

The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration -5.40 m/s2 for 4.40 s, making straight skid marks 63.1 m long ending at the tree. With what speed does the car then strike the tree?

16. ## Chemistry

PLEASE help because I'm really confused on how to do the entire thing. I don't know how to find the mL. Am I suppose to do anything with the 250mL? A person stops in every day and orders 250 mL of house coffee at precisely 95°C. but enough milk at 10°C

17. ## Physics

Two identical masses are connected by a (massless, stretchless) string across a (massless, frictionless) pulley. The mass on the right is held so that the string connected to it is horizontal. Everything is initially at rest; the tension is the string is

18. ## Chemistry

An electrical heater is used to supply 200.0 J of energy to a 30.0 g sample of water, originally at 285.0 K. Determine the final temperature in degrees Kelvin. (the specific heat capacity for water is 75.291 Jmol-1K-1)

19. ## physics

A ball is thrown horizontally from a height of 18.18 m and hits the ground with a speed that is 4.0 times its initial speed. What was the initial speed?

20. ## Trig

Evaluate the expression cos75°sin15°+sin75°cos15°

21. ## physcis

a flight attendant pulls her 70 kg flight bag in an airport terminal holding the handle 50 degrees above the horizontal. she pulls the bag a distance of 200 m while exerting a 40 n force acting along the handle with a constant speed how much work does the

22. ## CHEM 1A

Balanced equation, 4KNO3(s) ----->2K2O(s) + 2N2(g) + 5O2(g) To produce 51.8kg of O2, How many moles of KNO3 must be heated? How many grams of KNO3 must be heated? Do you calculate like KNO3 and O2 is just one mole or do you divide 4/5 at the end of the

23. ## Physics

A dart gun is fired while being held horizontally at a height of 0.90 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 4.00 m. A college student holds the same gun in a horizontal

A patient takes vitamin pills. Each day he must have at least 630 IU of vitamin​ A, 5 mg of vitamin Upper B 1​, and 80 mg of vitamin C. He can choose between pill​ 1, which contains 150 IU of vitamin​ A, 1 mg of vitamin Upper B 1​, and 10 mg of

25. ## Algebra

In 2009, a diabetic express company charged \$39.95 for a vial of type A insulin and \$30.34 for a vial of type B insulin. If a total of \$1747.64 was collected for 50 vials of insulin, how many vials of each type were sold?

There are 50 questions on a test. If a 60% is considered passing, how many questions do you have to get right to pass?

27. ## Chemistry

How many moles of H_2 are needed to produce 13.27g of NH_3?

28. ## algebra

suppose you have 60\$ ro buy a shrimp and chicken wings for a party. shrimp costs \$10/lb and wings cost\$6/lb. write a linear equation that could be used to determone the number of pounds of each food that can be purchased with 60\$

29. ## Chemistry

A gas occupies 275 ml at 0°C and 610 Torr. What final temperature would be required to increase the pressure to 760 Torr, the volume being held constant?

30. ## Chemistry

If 125 grams of KClO3 decomposes completely, how many moles of oxygen gas is produced?

31. ## Science: Physics

A force of 50 N directed at an angle of 45 degrees from the horizontal pulls a 70 kg sled across a frictionless pond. The acceleration of the sled is most nearly (sin 45 degrees = cos 45 degrees = 0.7).

32. ## physics

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,

33. ## Math

Which of the following polynomials could have the same end behavior as f(x)=ax^6+bx^5+c? There may be more than one correct answer. Select all correct answers. a. nx^5+bx^4+c b. kx+b c. dx^4−bx^3−cx^2+dx+e d. −jx^8+bx^7+cx^4 e. −mx^2 can someone

34. ## Math

Least number possible with 5 in thetousand place

35. ## Physics

When a 226/88 Ra nucleus decays by emitting an alpha particle, what is the atomic number of the resulting nucleus? What is the resulting atomic mass?

36. ## Math

402 students were surveyed about their preferences of sports. 140 students like football, 144 students like baseball, and 42 students like both sports. How many students like exactly one of the two sports? a) 200 b) 140 c) 284 d) 98 e) 102

37. ## physics

A dart gun is fired while being held horizontally at a height of 0.90 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 4.00 m. A college student holds the same gun in a horizontal

38. ## Economics

In 1988 interest on the national debt was \$214 billion and in 2018 it was \$532 billion. In 1988 10% of the interest was paid to the foreign sector and in 2018 28% was paid to the foreign sector. In percentage terms, how much did interest paid to the

39. ## Computer Programming

I must write a program using Java that calculates the amount a person would earn over a period of time if his or her salary is one penny the first day, two pennies the second day, and continues to double each day. The program should display a table showing

40. ## Physics

A cart is coasting at a speed v A along a straight and level road. When ten percent of the wagon’s mass is thrown off the wagon, parallel to the ground, and in the forward direction, the wagon stops. However, if this same amount of mass is thrown out the

41. ## stats

A human resources manager at a large company wants to estimate the proportion of employees that would be interested in reimbursement for college courses. If she wishes to be 95% confident that her estimate is within 5% of the true proportion, how many

42. ## Math

Lisa ate 1/3 of pizza. Kate ate 4/12 of same pizza. What fraction did they eat altogether

43. ## physics

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,

44. ## Physics

A block of mass m has a spring –spring constant k and length L –connected, vertically, to the bottom. The block is dropped from height h, towards the floor. Assuming the spring is stiff enough that it does not compress fully at the floor, what is the

45. ## Math

(Car Sales) Of the cars sold during the month of July, 89 had air conditioning, 99 had automatic transmission, and 74 had power steering. 5 cars had all three of these extras. 24 cars had none of these extras. 24 cars had only air conditioning, 65 cars had

46. ## Dynamic n vibration, physics

A system is represented by the equation: 2x”+128x = f(t) Obtain the free response of the system in the form a) x = A sin wn (t ) + B cos wn (t) b) x= A sin wn (t) + ϕ The initial conditions are x(0) = 0.05m and x’ = 0.3m/s.

47. ## Math

The manager of a manufacturing company knows that they will need a new machine in one of their factories. The new machine will cost them \$13,700. The manager has determined that they can afford to pay 10% of the cost of the machine in cash. They can then

48. ## Physical science

the space shuttle typically orbits 400 km above the earth's surface.the earth hass a mass of 5.98*10 to the 24 squared kg and a raduis of 6,380 km.A)how much would a 2000 kg part form the space station weight when it has been lifted to that orbit in the

49. ## physics

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,

50. ## algebra

assume that a jeweler needs 80 grams of an alloy that is 30% gold. He has avaliable one alloy that is 5% gold and another that is 85% gold; he will mix some of each If x equal the number of grams of the first alloy (so the number of grams of the second is

51. ## Math

A license plate consists of 3 letters followed by 2 digits. How many license plates are possible if the 1st letter cannot be I nor O, the 1st digit cannot be 0, and no letters or digits may repeat? a) 1,080,000 b) 1,166,400 c) 1,757,600 d) 1,460,160 e)

52. ## Math

A problem is listed below. Identify its type. John bought a new house. He made a \$4,500 down payment and financed the rest, \$280,000, through his credit union. The credit union charged him 11% per year compounded monthly for 22 years. How much were his

53. ## Physics

The weight of an object is the same on two different planets. The mass of planet A is sixty percent that of planet B. Find the ratio of the radii of the two planets, rA/rB

54. ## Algebra

A store mixes red fescue worth \$10 per pound and ryegrass worth \$13 per pound. The mixture is to sell for \$12 per pound. Find how much of each should be used to make a 120 pound mixture.

55. ## Physics

A friend has journeyed to the mountain foothills to escape the effects of radioactivity altogether. While bathing in the warmth of a natural hot spring, she wonders aloud how the spring gets its heat. What do you tell her?

56. ## CHEM 1A

Can someone please help me..... I have limited reactant formula problem. I am completely lost. 2Ca(s) + O2(g) ----> 2CaO(s) Calculate the mass of Calcium Oxide that can be prepared from 6.87g of Ca and 4.58g of O2. I calculated 2Ca to .171mol and O2 to

57. ## Statistics

1. The finishing times for the population of all swimmers performing the 100-meter butterfly are normally distributed with a mean ƒÝ of 55 seconds and a standard deviation ƒã of 5 seconds. a.) The sponsors decide to give certificates to all swimmers

58. ## physics

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,

59. ## Physics

a siren has a frequency of 1099 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1185 Hz. What is the speed of the observer?

60. ## physics

A solid uniform cylinder of mass 4.6 kg and radius 0.051 m rolls without slipping at a speed of 0.78 m/s. What is the cylinder’s total kinetic energy? please show some work so that I can learn from it.

61. ## physics

A child pushes a merry-go-round with a force of 80.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merry-go-round has a radius of 1.15 m, how much work does she do?

62. ## Algebra

Solve using the substitution method. -5x + y = 16 9x + 13y = 60

63. ## physics

A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature of the room at the end of 54.0 min if

64. ## Government

If no presidential candidate wins a majority of electoral votes, who can choose the president. http://www.usconstitution.net/const.html#A2Sec1 In addition to the above excellent answer please consider the following. The lack of any candidate receiving a

65. ## Physics

A low friction cart of mass m, traveling at speed v, collides (perfectly) elastically with a cart of triple the mass, initially at rest. What is the result of this collision? (What are the final, after-collision velocities?) Do NOT use the derived

66. ## Physics

A car, starting from rest, accelerates down a hill reaching 30.0 m/s in 6.00 s. During this time, the driver notices that the fuzzy dice hanging by a string from the ceiling is perpendicular to the ceiling. Find (a) the angle θ of the hill and (b) the

67. ## Physics

A 565 N mountain climber moves across a rope strung across a canyon. When she is more than halfway across, she notices the rope makes a 10 degree angle (from horizontal) behind her and a 25 degree angle (from horizontal) ahead of her. What are the tensions

68. ## calculus

Find the volume of the solid region which lies inside the sphere x^2 + y^2 + z^2 = 2 and outside the cone z^2 = x^2 + y^2 Set up the integral in rectangular, spherical and cylindrical coordinates and solve using the easiest way. Any help would be greatly

69. ## physics

A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,

70. ## Chemistry

3. 0.1825 g of Fe(NH4)2(SO4)2•6H2O is dissolved in 250.00 mL of solution; this is Solution A. 5.00 mL of Solution A is transferred to another flask, and it is diluted to a total of 100.0 mL to make another solution, which is Solution B. Next, 3.00 mL of

71. ## physics

A diffraction grating with 1000 slits/cm is oriented parallel to the y-axis and its center is located on the x-axis at x = -5.00 m. A source of light of wavelength 650 nm is located on the x-axis at x = -125 m. At how many locations does constructive

72. ## Algebra

One canned juice drink is 15% orange juice another is 5% orange juice. How many liters of each should be mixed together in order to get 10L that is 12% orange juice?

73. ## physics

suppose your car is on a 5% grade,if your car weighs 15,000N what is the component of its weight parallel to the road?

74. ## Math

Diane took a math test. The ratio of the number of problems Diane got incorrect to the number of problems she got correct was 2:7. If the test had 36 questions on it, how many problems did she get correct?

75. ## Chemistry

A student uses 57.4 ml of 0.2m of RbOH to titrate 25.0ml of HcLo3. What is the concentration of HcLo3?

76. ## physics

Just wanted to say a quick thanks to Steve and Damon, figured it all out, thanks guys, awsome!!!

77. ## algebra

Determine the slope of a line passing through the points (2, 9) and (0.66, 9).

78. ## physical science

a race car having a mass of 2550 kg is accelerated by a force of 127,500n.what is the accelerration?

79. ## chemistry

Which number is the greatest number or significant digits 17.500 or 6.022 x 10^23

80. ## chemistry

A sample of gold is at a initial temperature of 350 k. Once dropped into a coffe cup calorimeter of heat capacity 400 k^-1 it contains 50 g of water at 300 k. Specific heat capacity is 0.129 for gold and 4.18 for water. what is the final temp of all gold,

81. ## chemistry

What mass of benzoic acid can be made from a reaction where 4.87g benzyl alcohol is combined with 300mL of bleach? The reaction is conducted in water and dichloromethane. Describe a method of separating the benzoic acid from the sodium chloride byproduct

82. ## Chemistry

An alloy contains 39.5 mass% silver (Ag) and has density og 7.86 g/ml What volume of alloy would be needed to contain 12.0g of pure Ag?

83. ## Physics

Box, mass m 1 , at rest against a compressed spring, spring constant k and compression of Δx, at the top of a ramp, height h, is released. It slides down the ramp, angle θ, with friction, coefficient μ. Half way down the ramp, it bumps into and sticks

84. ## math

If there are 36 buttons in a jar and there are 3 times as many white buttons than red, how many of each are in the jar? What is the equation and how do I solve?

85. ## Physics

A ball with a mass of 0.25 kilogram is swung on the end of a rope that is 3.0 meters long. The ball travels with a linear velocity of 10.00 meters per second. What centripetal force is acting on the ball?

86. ## Physics

A missile launcher, mass M, at rest on a horizontal track fires a missile, mass m, horizontally. a) If the launch speed of the missile is v o , what (effective) coefficient of (kinetic) friction is required in order to stop the launcher within x meters?

It is a beautiful sunny day at Canada’s Wonderland. The U.V. index for this day is 8, or high, so sunscreen is a must for all people. The effectiveness of sunscreen is indicated by the sunscreen protection factor (SPF). The higher the SPF number the

88. ## arithmetic

A model airplane takes 2.7 hours to contruct and 13.5 hours to finish. Determine the ratio of construction time to finish in simplest form

89. ## High School

What are the compulsory and optional subjects in high school?

90. ## algebra

solve the inequality (x-3)/10 >_ (greater or equal to) (x-2)/3 how would you do this? I don't understand how to do the fractions

91. ## Biology

What animals are found on mangrove islands

92. ## physics

A block of mass m is pushed along a horizontal table by a force F= 70 N a an angle 55 degrees with the horizontal. The coefficient of kinetic friction is 0.3 Write Newtons second law using vectors. Write newtons second law using x scalar components

93. ## science

: how much work is done by 0.020 meters squared of gas if its pressure increases by 2.0 multiplied by 10 to the 5th power Pa and the volume remains constant ?

94. ## math

what amount of principal would yield an interest of \$36 in 3 years at a 3% simple interest rate?

95. ## Physics

A 750 kg car traveling 22.0 m/s due north crashes into a 1500 kg truck traveling 20 m/s due west. The two vehicles become locked together and travel 19.0 m before stopping. Find the average frictional force (magnitude and direction) that brings the two to

96. ## Physics

A 5.0 kg shell is fired vertically upward. At its max height of 350.0 m, it explodes into 3 pieces. A 1.0 kg chunk lands 15.0 m away, 45 O due northeast from the launch site. A second 1.0 kg piece lands 25.0 m, 60 O south of east from the launch site. If

imitating Could someone please tell me what the prefix, base word, and suffix would be of above word?

(sqr8) {(sqr9ab)/(sqr3b) + (sqr27a)} How do you solve this

99. ## Math

Put these fractions in order from least to greatest.2/5 3/4 and 1/2. I am trying to help my daughter with her homework. Would you please explain to me how the easiest way to do this.