harold

Most popular questions and responses by harold
1. Chemistry

Many power plants produce energy by burning carbon-based fuels, which also produces CO2. CO2 is a greenhouse gas, so over-production can have negative effects on the environment. Use enthalpy of formation data to calculate the number of moles of CO2 (g)

2. Chemistry - Redox

Balance the following redox reactions by inserting the appropriate coefficients. Al + MnO2 --> Al2O3 + Mn HNO3 + H2S --> NO + S + H20 Initially, I know the first step is to find assign all the oxidation numbers for the products and reactants listed, but am

3. Physics

In a front-end collision, a 1400 kg car that has shock-absorbing bumpers can only withstand a maximum force of 75 kN before any sort of damage occurs.If the maximum speed for a car that is nondamaged in a collision is 10 Km/h, by how much must the bumper

4. Physics

A block of weight 3.8N is launched up a 30 degree inclined plane of length 2.25m by a spring with spring constant 2.35kN/m and maximum compression 0.10m. The coefficient of kinetic friction is 0.50. How much kinetic energy does it have at the top of the

5. science

The hot coils in an electric baseboard heat the surrounding air using _____.

6. Chemistry

For each of the following precipitation reactions calculate how many grams of the first reactant are necessary to completely react with 55.8 g of the second reactant. K2SO4 + Sr(NO3)2 + SrSO4 + 2KNO3

7. calculus

A company manufactures and sells x cellphones per week. The weekly price-demand and cost equations are given below P=400-.5x and C(x)=20000+130x What price should the company charge for the phones and how many phones should be produced to maximize the

8. Math

You have 4 different markers. If you want to choose 2 , how many different combinations can you make?

9. math

Given: Vertical isosceles triangles. RS bisects QT. ∠R ≅ ∠S. Prove: ∆QRP ≅ ∆TSP 2 paragraph proof

10. science

three 10 ohm resistors are connected in parallel what is the equivalent resistance of the parallel combination?

11. chemistry

Two new metallic elements have been discovered, Cimium (Ci) and Sadowium (Sd). Both the pure elements and their solutions form simple cubic lattices. The bond strengths of the Ci-Ci and Sd-Sd bonds are known, but not the Ci-Sd bond. Bond Bond Energy

12. Physics

An asteroid heads for Earth at 12 km/s. In addition, a NASA space team is able to attach a rocket booster to the asteroid, which then allows the asteroid to move at 28 degrees to its original path to a speed of 20km/s. What is its average accleration for

13. Physical Science

Is it true that electric cars do not generate pollution because they have batteries?

14. Algebra 2

What are the real and complex solutions of the polynomial equation? 27x^3 + 125 = 0 I already got the real solution x = -5/3, I just need to figure out how to find the complex solution. Any help?

15. chemistry

How many molecules are in 0.495 mole of lactic acid?

16. math calculus

The demand function for a product is given by p = 10,000(1 − (5/5 + e^−0.001x)) where p is the price per unit (in dollars) and x is the number of units sold. Find the numbers of units sold for prices of p = \$1000 and p = \$1500.(Round your answers to

17. calculus II

(A) 2 students are sharing a loaf of bread. Student A eats half of the loaf, then student B eats half of what remains, then student A eats half of what remains, and so on. How much of the loaf will each student eat? (B) 2 students are sharing a loaf of

18. math

Given: M is the midpoint of LN . ∠LMP ≅ ∠NMO, ON⊥NM , PL⊥LM Prove: ∆NMO ≅ ∆LMP

19. the parts of speech

13. In which sentence do the capitalized words represent a prepositional phrase? A. The Maxi Deli is AROUND THE CORNER. B. Apart from his looks, I would never TRUST HIM. C. The conductor CALLED OUT, "All aboard!" D. I am not going TO RUN out of patience.

20. calculus II

(A) 2 students are sharing a loaf of bread. Student A eats half of the loaf, then student B eats half of what remains, then student A eats half of what remains, and so on. How much of the loaf will each student eat? (B) 2 students are sharing a loaf of

21. Physics

GPS satellites are at altitudes of exactly 20000 km, where the acceleartion of gravity is only 5.8% of its surface value.What is the orbital speed of the GPS satelites to the nearest hour. I got 9774, but I know this is wrong any help would be greatly

22. Physics

An asteroid heads for Earth at 12 km/s. In addition, a NASA space team is able to attach a rocket booster to the asteroid, which then allows the asteroid to move at 28 degrees to its original path to a speed of 20km/s. What is its average accleration for

23. Science

If a galaxy is 1,000 Mpc away, how fast isit recending?

24. Physics-Update

An asteroid heads for Earth at 12 km/s. In addition, a NASA space team is able to attach a rocket booster to the asteroid. The rocket booster fires for 10 min after which the asteroid is moving at 28 degrees to its original path to a speed of 20km/s. What

26. Physics

A 10 kg sled slides down a hill with an incline of 30 degrees above the horizontal. Because of friction, it maintains a constant speed. For every meter that is traveled, how much energy (in joules) does the sled lose? I say 98 sin(30) Joules?

27. Providence

Business relationships often present ethical dilemmas: not easily resolved easily resolved by following the relevant laws best resolved by creating a lose-lose situation irrelevant and therefore require no action

28. science

when a bar magnet is moved toward a stationary conducting loop which direction does the induced current in the loop flow?

29. chemistry

What is the minumum acceleration potential (V) that must be applied to a beam of free electrons for diffraction to occur in a crystal of niobium (Nb)? Express your answer in volts.

30. science

if 100g of water at 20 degrees C absorbs 5kj of heat, what amount will the temerature of the water increase?

31. science

if a 10 microfarad capacitor and a 20 microfarad capacitor are connected in series what if the equivalent capacitance of the series combination?

32. Physics

A 50 gram block is placed on a frictionless ramp 2 meters above the ground. It slides down the ramp and compresses a 140 N/m spring at the bottom. How far will the spring be compressed when the block is stopped by the spring? say 1.7 m

33. Physics

You throw a stone into some nice soft and gushy mud. It penetrates one inch, slowed by a constant force. If you wanted the stone to penetrate four inches instead of one, you would have to throw the stone into the mud? I say eight times as fast?

34. math

If there are 36 different flavors of ice cream and two types of cones are available, how many choices for a single scoop of ice cream on some type of cone do you have?

35. Chemistry

A) n=1 l=0 ml=0 ms=1/2 B) n=3 l=1 ml=-1 ms=1/2 C) n=2 l=0 ml=0 ms=-1/2 D) n=2 l=1 ml=0 ms=1/2 E) n=3 l=2 ml=0 ms=1/2 F) n=2 l=1 ml=1 ms=-1/2 Which of the above sets of quantum numbers could possibly describe an electron in the ground-state configurations

36. Physical Science

What are the noninvasive benefits of the medical technologies that rely on physics of elementary particles?

solving for X: 3000=8800(1+(0.025)x) I divided both sides by 8800 got 15/44= 1+0.025x subtracted each side by 1 then got -29/44=0.025x = -26.36.. Is that right?

38. science

what entropy changes occur whin a substance melts?

39. Phiysics

A rock is dropped from a hotel and strikes the ground with a particular speed. In order, to double the speed at impact, you would have to drop the rock from the hotel at? I say impossible to determine

40. Physics

A 1500 kg truck travels at 30m/s. It faces a force of 400 N from air resistance, what is the car's average power output? Is the answer 675 kw?If not please help me in any way you can,by showing the formula you used.

41. Physical Science

What kind of rock is below the soil in Waynoka, Oklahoma?

42. Physical Science

What direction are the plates moving that I live near?

43. Science

The Milky Way has a radius of approximately 100,000 light years. How many miles is that? How long would it take you to travel across our galaxy if you were traveling at 50% the speed of light (show work)?

44. English

Dave hoped that Steve and ____ would win the tennis tournament Him Himself He His

45. MsSue I need YOU

Hi Mssue you helped me wonderfully before and I thank you. I would also like your help again.. My teacher says from previous papers that my summaries lack clarity/elaboration.. I was hoping maybe you could help me with that.. I have the 1st paragraph which

solving for X: 3000=8800(1+(0.025)x) I divided both sides by 8800 got 15/44= 1+0.025x subtracted each side by 1 then got -29/44=0.025x = -26.36.. Is that right?

I need to know exactly what the Foreign Corrupt Practice Act in Lima, Peru states as far as for a company called Gelerex.

48. Physics

The chemical potential energy of a certain amount of gasoline is converted into kinetic energy in a truck that increases its speed from 0 mph to 30 mph. To pass another truck the driver accelerates from 30 mph to 60 mph. Compared to the energy required to

49. Physics

Thank you so much for answering my questions thus far drwrls. One more,A force of 100 N, acting over a distance of 10 meters, increases the kinetic energy of a moving object by 500 J. This information is sufficient to conclude that the object accelerated,

50. Math

I am working on linear equations. Is this answer correct? -27=8x-5x -27=8x+ -5x -27=3x -27/3=3x/3 -9=x

51. Physics

A 72kg cement block rides a crane to reach the upper floor of the building. What force does the bucket of the lift exert on the surgeon when the bucket is moving upward at a steady 2.3 m/s? Is the answer 705.6 newtons?

52. Physics

A 72kg cement block rides a crane to reach the upper floor of the building. What force does the bucket of the lift exert on the surgeon when the bucket is moving upward at a steady 2.3 m/s? I don't have an acceleration so what do i do?

53. entrepenuers

what lessons we can learn from successful entrepeneurs? Do you mean entrepreneurs? One quotation I've heard several times struck me as I read your question: "Try again. Fail again. Fail better." (Samuel Beckett, http://www.tomphillips.co.uk/portrait/sbec/)

54. math

What's the interest rate for as loan of 150,000 euros for 10 years, with an interest payment of 22,000 euros?

55. Physical Science

How can we talk about the evolution of stars over billions of years when human beings have been observing stars for only a few thousand years?

56. Physical Science

Where do electric cars obtain their energy?

57. Physical Science

How do ocean currents affect local climate?

58. Physical Science

What are the differences between ice caps and glaciers?

59. Physical Science

If I live in Oklahoma, what kind of ecosystem is near me?

60. Physical Science

How do we know that tectonic plates move?

61. Physical Science

If the Mid-Atlantic Ridg opens at the rate of 5 centemeters per year, how much farther apart will Paris and New York be in a 1,000 years?

62. Physical Science

if Mount Everest is now 8,850 meters tall and is growing 2 centemeters per year, how old is it?

63. English

Whenever i____to the grocery, I always______ for fresh produce Went/looked Went/look Go/looked Had gone/look

64. English

While I like bacon, it is not good for me. Sentence fragment Comma splice Run on sentence Complete sentence

65. english/usgov URGENT

can you guys help me write a conclusion for this and also help me elaborate my essay better. I've worked so hard and it's due tomorrow Politicians can't agree on how to create more jobs and this is a major problem. The U.S. economy is in trouble because it

solving for X: 3000=8800(1+(0.025)x) I divided both sides by 8800 got 15/44= 1+0.025x subtracted each side by 1 then got -29/44=0.025x = -26.36.. Is that right?

67. science

what are the arrangement and motions of molecules of substances in the solid phase, liquid phase, and gaseous phase?

68. science

when a reaction in solution produces energy, what happens to the temperature of the solution?

69. math

cards have been removed from a wall one at a time down to last two, a queen of spades and a queen of hearts what are odds of picking the queen of hearts

70. college

The minimum daily values (MVD)for certain foods are given. They are based on a 2,000 calorie day diet. Find decimal and fractional notation for the percent notation in each sentence. (a) 1 ounce of Tostitos provides 9% of the Mdv of fat. (c)1/2 cup of

71. math

8)State a valid conclusion for the following statements: • If a person is a senior in college, then they have completed all of their general education requirements. • Beth is a senior in college

72. Physics

A cart is launched on an air track with a certain speed from the force of a compressed spring. If you wanted to launch the cart at twice the speed, the spring should be compressed by? I say twice as much.

73. Physics

If you have two objects, one four times heavier then the other, both at rest on a frictionless surface, and a person pushes against them for a distance of 5 meters. Assuming the force applied on both objects are equal, the kinetic enrgy of the light object

74. Physics

A 1400 kg truck goes up a hilly road at a steady 60 km/h. The force of air resistance on the truck is 400 N. If the truck's engine supplies the enrgy to the drive wheels at a rate of 35 kW, what is the slope angle of the road? I get 7.1 please help, don't

75. Physics

A figure skater glides along the ice at 2.2 m/s , she then accelerates at 1.3 m/s^2 for 3.0 seconds. At the end of that time she is moving at 6.1 m/s. What would be the angle between the acceleration vector and the initial velocity vector? .. please help

76. Physics

A bullet train is traveling at 23.3 m/s when it approaches a slower train 47 meters ahead traveling in the same direction at 6.67 m/s. If the faster train begins decelerating at 2.1m/s^2 while the slower train continues at constant speed, how soon will

77. math

the LCD for the Fraction 1/3, 3/4, 5/32, and 8/9 is

78. Math

A tennis ball is hit into the air and can be modeled by h=16t*2++40t+3, where h is the height t is the time it takes the ball to travel. 1) At what time t does the ball reach its maximum height above the court? How high did the ball go? 2) How long did it

79. Algebra

f(2.4) = 4(2.4) - 2.4^2 = 3.84 If I were to continue this iteration what would be the next equation? I am just confused how to continue with a problem I'm doing.

80. economics

Suppose that the reserve ratio is .25, ad that a bank has actual reserves of \$15,000, loans of \$40,000, and demand deposits of \$50,000. Excess reserves are \$

81. us history

Describe the major military confrontations between the Native Americans and whites on the post-Civil war frontier

82. Physica Science

Describe the movement of the Earth based upon the perceived change in positions of the stars

83. Physical Science

What are three medical technologies that rely on the physics of elementary particles?

84. Physical Science

What is the question that many have about the Department of Energy and Yucca Mountain

85. Physical Science

Explain how the temperature difference between the poles and the equator drives the motion of the oceans and atmosphere.

86. Physical Science

Why do we call groundwater in most areas a "nonrenewable resource"?

87. Physical Science

Describe how energy flows through the ecosystem near oklahoma

88. Physical Science

Describe how transform plate boundaries differ from plate boundaries.

89. Physical Science

How many adjacent plates are there to the North American plate?

90. Physical Science

Descrive the "big splash" theory of the Moon's origin.

91. Physical Science

If I live in Oklahoma, and live in the North American plate, which direction are the adjoining plates moving?

92. Physical Science

If I live in Oklahoma, what tectonic plate do I live in? How many adjacent plates are there to the one I live on? In which direction are these plates moving?

93. Physical Science

How do we know that tectonic plates move? Describe how transform plate boundaries differ from plate boundaries.

94. Physical Science

What are the tallest and longest mountain chais on Earth? How were they formed?

95. Math/Science

If it is 587 quadrillion miles across our galaxy and you are traveling at 93,000 miles per second, how long will it take you to go across it?

96. Science

If you are traveling 93,000 miles per second, and you needed to travel 620 trillion miles, how long would it take you?

97. Scence

the average temperature of the universe is 2.7 Kelvin. What temperature in degrees Fahreneit?

98. English

When one buys insurance, you need to be clear about your needs Pronoun shift in number Pronoun shift in person Ambiguous reference No error

99. US Gov help URGENT

I'm very ignorant when it comes to politics. I had to write a summary on Shutdown looms: Spotlight now on Senate after Boehner wrangled House GOP votes If you go to google and type that in it's the first link.. Can someone give me some key pointers as to