Thursday

April 24, 2014

April 24, 2014

Total # Posts: 68,389

**Math algebra**

1) Charlie plans to sell twice as many magazine subscriptions as Patrick. If Charlie and Patrick need to sell at least 100 subscriptions in all, what inequality could be used to determine how many subscriptions, x, Charlie needs to sell? I really don't understand this.

**Human biology please help**

A) Enzymes B) Proteins

**Math**

-23m - (-35m) = -48 -23m + 35m = -48 12m = -48 m = -4

**physics**

A 50-kg box is being pushed a distance of 7.1 m across the floor by a force whose magnitude is 175 N. The force is parallel to the displacement of the box. The coefficient of kinetic friction is 0.19. Determine the work done on the box by each of the four forces that act on th...

**physics**

B) W = Fd (1.5 x 10^-4) = (0.37 - Fg)d (1.5)(10^-4) = (0.37 - 9.8m)d (1.5)(10^-4) = [0.37 - (9.8)(2.1)(10^-4)]d 0.00015 = 0.368d d = 0.0004076 meters A) KE + PE = KE + PE (1/2)mv^2 + (0) = (0) + mgh (1/2)mv^2 = mgh (1/2)v^2 = gh v^2 = (2)(9.8)(0.0004076) v = 0.08938 meters per...

**physics **

Starting from rest, a 2.1x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.37 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground?...

**Math**

Write a division equation that has a solution of -20

**Math**

You mean like an algebraic equation? 7x = 2 If that's not what you're looking for, maybe 2 x 1/7 = 2/7 will work.

**Math**

Write a multiplication equation that has a solution of 2/7

**PHYSICS**

The model airplane in Figure 5.6 is flying at a speed of 13.6 m/s on a horizontal circle of radius 19.1 m. The mass of the plane is 1.20 kg. The person holding the guideline pulls it in until the radius of the circle becomes 10.6 m. The plane speeds up, and the tension in the ...

**math**

Inversely means they're on opposite sides of the fraction (meaning one is the numerator, one is the denominator). So: 8/10 = 6/Y 8Y = 60 Y = 60/8 = 7.5 The answer is C.

**k**

A pole-vaulter just clears the bar at 4.07 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3900 J. What is his weight?

**ph**

A 64.4-kg skateboarder starts out with a speed of 1.95 m/s. He does 119 J of work on himself by pushing with his feet against the ground. In addition, friction does -260 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ska...

**biology**

This isn't too scientific or anything, since it's been a while since I took chem, but it could be that the solution was only able to hold a certain concentration of CO2. If your shortest blowing time was enough to completely saturate it, then the other trials with long...

**PHYSIC**

PEi + KEi = PEf + KEf mgh + (0) = (0) + (1/2)mv^2 mgh = (1/2)mv^2 (9.8)(4.07)m = 3900 m = 97.8 kg Fg = mg = (9.8)(97.8) Fg = 958 N

**PHYSIC**

A pole-vaulter just clears the bar at 4.07 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3900 J. What is his weight?

**U.S. History**

1. True 2. False 3. False 4. True

**U.S. History**

TRUE OR FALSE (The First World War) 1. Until 1915, most Americans thought of the war as a European conflict that would have little effect in the United States. 2. Big Berthas were massive ships used to transport German troops. 3. The Treaty of Versailles demanded that Russia a...

**Math**

It's kind of tricky to answer these, since more than one graph could work. However, I'd say that a line or bar graph (leaning more toward bar graph) would be good for #1, and a bar graph for #2 (unless you're allowed to use pie charts, in which case that would be t...

**Math**

What kind of graph would you use to show the number of twins born each year? I think a line graph Would you use a line plot or bar graph to display a survey of what teens do for entertainment after school? I think line plot

**US History**

Define beatnik.Why was such a person dissatisfied?

**Math**

Claudia weighed her puppy each moth. Explain which data display you would use to show the puppy's growth and why you think this is the best method of displaying the data. A line graph because it shows change over time

**Math**

The data shows how a family budgets it's weekly income. It uses percentages and weekly bills in dollars. Which graphs could you choose to display your data? I think the circle graph because your using percentages, and maybe a line graph

**Math**

What kind of graph would you use to show the number of twins born each year? I think a line graph Would you use a line plot or bar graph to display a survey of what teens do for entertainment after school? I think line plot

**math**

Brittany has a gift box in the shape of a cube.Each side of the box measures 15 cm. What is the volume of the gift box?

**physics**

Carmen is standing on a giant skateboard that is initially at rest. If we ignore frictional effects with the floor, what is the momentum of the skateboard if Carmon walks to the right with a momentum of 500 ? A. 500 to the right B. 500 to the left C. zero D. 500 thought it wou...

**physics**

C. Matter (mass) cannot be created or destroyed, it can only change.

**physics**

Under what conditions is mass conserved? A. Whenever the system is isolated or closed. B. Only when the change is a chemical one. C. Always. D. Only when the change is a physical one. I was thinking A.

**physics**

If Earth's mass were suddenly and magically reduced to half its present value, the Sun's gravitational force on Earth would A. be reduced by a factor of 2. B. be reduced by a factor of 4. C. increase by a factor of 2. D. remain the same. I was told it remained the same...

**physics**

22. On the surface of a certain planet, there is one unit of gravitational force exerted on every 0.4 units of mass. The gravitational field strength on this planet has numerical value A. 0.4 B. 2.5 C. 1.6 D. 1 C.1.6 is wrong

**physics**

V = (4/3)(pi)(r)^3 V = (4/3)(pi)(2r)^3 V = (4/3)(pi)8r^3 (4/3)(pi)(8)(r)^3 ÷ (4/3)(pi)(r)^3 Everything cancels out but the 8, so the answer is A.

**physics**

If you double the radius of a sphere, its volume increases by what factor? A. 8 B. 6 C. 2 D. 4 I thought maybe C.2 or D.4

**physics**

B. Centripetal acceleration goes inward, so it follows that centripetal force would do the same. The velocity of the horses and everything is tangent to the circular path, though.

**physics**

Your instructor rides on a merry-go-round turning at a constant rate. In which direction does the net force on your instructor point? A. away from the center B. toward the center C. down D. tangent to the circular path I choose D.tangent to the circular path (wrong again)

**physics**

A bug rides on a phonograph record. In which direction does the change in velocity of the bug point? A. toward the center of the record B. tangent to the circular path C. away from the center of the record D. up I thought C.away from the center of the record.

**physics**

If a ball is dropped from rest, it will fall 5 m during the first second. How far will it fall during the second second? A. 15 meters B. 10 meters C. 5 meters D. 20 meters the way the question is worded it seems it should be 10meteres but I think it wants total so would it be ...

**physics**

Which of the following could be considered to be an 'accelerator' in an automobile? A. brake pedal B. gas pedal (choose this one but says wrong) C. steering wheel D. All of these can cause the car to accelerate.

**probability**

???

**L.A.**

Has anyone here read A Retrieved Reformation? I have to write a dramatic scene about a conflict in that story. What conflicts can I use?

**Physics**

A group of swimmers is resting in the sun on an off shore raft. They estimate that 2.9 meters separates a trough and an adjacent crest of surface waves on the lake. In addition, they count 12 crests that pass by the raft in 16 seconds. What is the Period of these waves?

**Physics**

A hiker shouts towards a vertical cliff 305 meters away. The echo is heard 1.85 seconds later. How fast did the sound wave travel in air?

**physics**

A father (m= 90 kg) and son (m= 45 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 after they have separated. How fast is the father moving?

**physics**

A friend is making an iMovie and wants your help designing a skateboard stunt. You estimate that your friend�s mass is four times greater than that of the skateboard. For the following questions, ignore friction. In one scenario, your friend starts by standing at rest o...

**physics**

Two air-track gliders are held together with a string. The mass of glider A is twice that of glider B. A spring is tightly compressed between the gliders. The gliders are initially at rest and the spring is released by burning the string. If glider B has a speed of 3 m/s after...

**physics**

A tennis ball (m= 0.2 kg) is thrown at a brick wall. It is traveling horizontally at 16 just before hitting the wall and rebounds from the wall at 8 , still traveling horizontally. The ball is in contact with the wall for 0.04 s. What is the magnitude of the average force of ...

**physics**

A 600-kg geosynchronous satellite has an orbital radius of 6.6 Earth radii. What gravitational force does Earth exert on the satellite? A. 13.8 N B. 90.9 N C. 138 N D. 909 N

**physics**

A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540 N (about 120 lb). How large would this gr...

**physics**

An ashtray slides across a table with a speed of 0.9 and falls off the edge. If it takes 0.4 s to reach the floor, how far from the edge of the table does the ashtray land?

**physics**

What is the change in velocity if a car traveling 30{m}/{s} north slows to 20{m}/{s} north? A. 20{m}/{s} north B. 10{m}/{s} north C. 30{m}/{s} south D. 10 {m}/{s} south

**physics 1**

A 64.4-kg skateboarder starts out with a speed of 1.95 m/s. He does 119 J of work on himself by pushing with his feet against the ground. In addition, friction does -260 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ska...

**physics 1**

The model airplane in Figure 5.6 is flying at a speed of 13.6 m/s on a horizontal circle of radius 19.1 m. The mass of the plane is 1.20 kg. The person holding the guideline pulls it in until the radius of the circle becomes 10.6 m. The plane speeds up, and the tension in the ...

**physics**

A sled is being pulled across a horizontal patch of snow. Friction is negligible. The pulling force points in the same direction as the sled's displacement, which is along the +x axis. As a result, the kinetic energy of the sled increases by 47.5 percent. By what percentag...

**Help**

i'm sorry for not typing my answers first.

**Help**

Thank you very much.

**Help**

Oh. uh.. #1, A or c. but i'd go with A #2,B

**Help**

What is an example of bias in media? a website that presents a controversial opinion as though it were fact a television news program that presents both sides of a particular issue a podcast expressing an author’s opinion a blog about the history of the Civil War Why is m...

**physics**

A pole-vaulter just clears the bar at 4.07 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3900 J. What is his weight?

**Science :(**

Which of the following describes the correct sequence of events during the water cycle? precipitation → condensation → evaporation → runoff condensation → precipitation → runoff → evaporation runoff → condensation → evaporation &...

**:(**

pllzzz help

**math. plzz help**

calculate the slant height for the given square pyramid. Round to the nearest tenth. Pyramid base= 6cm height=5 cm 6.2 cm 5.8 cm 7.8 cm 7.2 cm Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth. Length= 10 cm widith= 4cm height= 10...

**math**

if venom A is three times as potent as venom B and venom C is 2.2 times as potent as venom B. how much more potent is venom C compared to venom A?

**math**

if four out every seven individuals in a population of armadillos carry a gene for a defective enzyme, how many individuals carry the normal gene in a population of 869 armadillos?

**Algebra 1 Answer Check**

Factor this trinomial. -16x + 20x + 6 A: -2(4x + 1)(2x - 3)

**Algebra 1 Answer Check**

Factor this trinomial. 9x^2 - x + 2 A: (3x + 2)(x - 1)

**math**

Factor. 18x^3+24x^2-45x

**algebra**

If you multiply a number by six and then subtract negative ten, the difference is negative twenty. What is the number?

**Math (check answers)**

C.multiply

**Physics**

How many watts of power do you expend when you exert a force of 0.50N that moves a book 2.1m in a time interval of 1.1s ? Express your answer to two significant figures and include the appropriate units.

**Physics**

What is his kinetic energy when his potential energy reduces to 1000 J? Express your answer to two significant figures and include the appropriate units

**Physics**

What change in kinetic energy does an airplane experience on takeoff if it is moved a distance of 480m by a sustained net force of 5400N ? Express your answer to two significant figures and include the appropriate units.

**Physics!**

How many joules of potential energy does a 1.2-kg book gain when it is elevated 4.0 ? Express your answer to two significant figures and include the appropriate units.

**Physics!**

Calculate the watts of power expended when a force of 2.0N moves a book 2.4m in a time interval of 1.0 s. Express your answer to two significant figures and include the appropriate units.

**Physics**

the work done in lifting a 600-N barbell 1.6m above the floor. What is the gain of potential energy of the barbell when it is lifted to this height? Express your answer to two significant figures and include the appropriate units.

**Physics**

Calculate the work done in lifting a 600-N barbell 1.6m above the floor. Express your answer to two significant figures and include the appropriate units.

**Math**

2x^10 - 6x^10 = ? Is this -4x^10?

**Algebra 1 (Step-by-Step) **

Factor this trinomial. -4x^2 - 8x + 5

**fractions **

12 dogs were in the park.2 of them were Dalmatians.what fraction of the dogs were Dalmatians

**math**

Calculate the slant height for the given cone. Round to the nearest tenth. Diameter = 8cm height = 9 cm 10.2 cm 11.4 cm 9.8 cm 12.0 cm

**physics**

A spring can store 25 J of energy when compressed by 0.13 m. What is the spring constant of the spring? Use SI units in your answer. k =

**Math 2 questions**

1.5.652 rounded to the nearest tenth. 2. The two triangles below are similar. Find the value of x. triangle 1: base: 4 height: 10 triangle 2: base: x height: 20 what would X be? my guess 8.

**Physics**

The electric field on the axis of a uniformly charged ring has magnitude 370kN/C at a point 6.2cm from the ring center. The magnitude 17cm from the center is 150kN/C ; in both cases the field points away from the ring.Find the ring's radius.

**Math help plz check my answers!**

Ooooohhhh. Thanks alot.

**Math help plz check my answers!**

nah. I think B.

**Math help plz check my answers!**

is it A?

**Math help plz check my answers!**

Name the quadrilaterals that have four equal sides. rhombus, square square, rectangle parallelogram, rhombus rhombus, trapezoid*** is this right?

**Math help plz check my answers!**

Lol thanks!! :-)

**Math help plz check my answers!**

11. Name the triangles that are classified by sides. right, scalene, isosceles scalene, isosceles, equilateral*** acute, right, obtuse obtuse, isosceles, acute

**Algebra 1 Answer Check**

Factor each trinomial. 1. -2x^2 + 5x + 12 A: -1(2x + 3)(x - 4) 2. 4a^2 + 8a - 5 A: (2a -1)(2a + 5) 3. -4x^2 - 8x + 5 A: -1(2x - 1)(2x + 5) 4. -5x^2 + 7x + 6 A: -1(5x + 3)(x - 2)

**math**

47. (-3,0),(1,4),(-1,6),(2,0) can some help me graph this

**English**

Leonardo da Vinci believed in soper vedere, or the power of observation. While his contemporaries looked for scientific truth in the writings of ancient scholars, da Vinci's theories were based on empirical research, that which he observed and recorded in his many notebook...

**Chemistry**

Predict the standard cell potential and calculate the standard reaction Gibbs free energy for galvanic cells having the following cell reactions: 2H2+O2=2H2O in acidic solution 2H2+O2=2H2O in basic solution I understand the idea behind the problem, but I am not sure how the ac...

**US History**

What is the second great awakeing?

**English**

I am assuming the rest of the answers to the questions were correct.

**English**

Choose the best answer 1. What do you get if you mix common bacteria and vinegar. The word common means a. multiple b. ordinary - the answer c. lower-class d. poisonous 2. It is a serious question. The answer is you get bacteria that eat toxic waste and turn that waste into sa...

**Algebra**

When I factor an expression completely, I get 6(v^2 + 9)(3v - 5). Is it possible to write this as 6(v + 3)(v + 3)(3v - 5)?

**algebra 1**

Divide the following radical and simplify the answer. 2003-04-05-00-00_files/i0160000.jpg

**programming**

Write an algorithm to compute average score for each student in the Computer Science Continuous assessment test. Assume each student sat for ten courses for the semester

**statistics**

1. A company decides to add a new program that prepares randomly selected sales personnel to increase their number of sales per month. The mean number of sales per month for the overall population of sales people at this national company is 25 with a standard deviation of 4. T...

**math**

1200

**physics**

A piece of metal has a mass of 85cg and a volume of 450L. What is its density in g/cm3? What would be the mass of 300 cm3 of this metal? What would be the volume of 00 ounces of this metal?

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