Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 1,666

**physics**

a skater holds her arms outstretched as she spins at 140 rpm. What is the speed of her hands if they are 125 cm apart?

**Physics**

A 36 kg box hangs from a rope. What is the tension in the rope if the following are true? (a) The box moves up a steady 5.0 m/s? (b) The box has vy = 5.0 m/s and is slowing down up at 5.0 m/s2?

**physics**

thank you!

**physics**

A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that μs = 0.6 and μk = 0.3. (c) What is the maximum acceleration the belt can have without the crate slipping? (d) If acceleration of the belt exceeds the value determined in part (c), what...

**physics**

How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?

**physics**

How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?

**PHYSICS**

A 900 kg car pushes a 1900 kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4800 N. (a) What is the magnitude of the force of the car on the truck? (b) What is the magnitude of the f...

**PHYSICS**

Zach, whose mass is 67 kg, is in an elevator descending at 12 m/s. The elevator takes 3.5 s to brake to a stop at the first floor. (a) What is Zach's apparent weight before the elevator starts braking? (b) What is Zach's apparent weight while the elevator is braking?

**physics**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from the castle wall does the cannonball hit...

**physics**

A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 92 m above the glacier at a speed of 135 m/s. How far short of the target should it drop the package?

**physics**

A go-cart has an initial speed of 23.4 m/sec. Fifteen seconds later the go-cart has a final speed of 36.8 m/sec. What is the magnitude of the go-cart's displacement?

**algebra**

How do I write this number in scientific notation 1. 8.68x10^1 2.1,900,000

**Physics **

A bullet with mass 4.91 g is fired horizontally into a 1.981-kg block attached to a horizontal spring. The spring has a constant 6.25 102 N/m and reaches a maximum compression of 6.38 cm. a) find the initial speed of the bullet-block system. b) find the speed of the bullet

**Pre-Calc**

1. Square both sides. (x+5)^5=(x+5) 2. FOIL the left side. x^2+10x+25=x+5 3. Subtract x and 5 from both sides. x^2+9x+20=0 4. Factor. (x+5)(x+4)=0 5. Solve using the zero product property. x+5=0 x+4=0 x=-5 and x=-4

**grammar**

Is this sentence. Mr. and Mrs. Lopez's plane tickets, incidentally were found in the lobby. Is this correct punctuation?

**Algebra**

I could use some help on this please. Write a linear function that satisfies the given conditions: h(-1) = 4, h(0) = -5 Thanks!!!

**Physics**

In a physics lab experiment, a spring clamped to the table shoots a 18 g ball horizontally. When the spring is compressed 20 cm, the ball travels horizontally 4.9 m and lands on the floor 1.3 m below the point at which it left the spring. What is the spring constant?

**statistics**

The following data lists the average monthly snowfall for January in 15 cities around the US: 37 33 35 27 9 45 22 8 42 48 37 39 9 15 12 Find the mean, variance, and standard deviation

**calculus**

the derivative of f(x) = e^(sin x)cos(x)

**calculus**

f(x) = e^(sin(x))cos(x)

**calculus**

f(x) = e^(sin(x))cos(x)

**calculus**

i missed something in it sorry. it was ∫sec 2x tan 2x dx

**calculus**

its sec 2x

**calculus**

i dont get what you mean?

**calculus**

∫sec 2x tan x dx

**freshman chem**

if 5.00 g of ethanol is added to 15.0g of whater, what is the % concentration of ethanol in water??

**chemistry**

if 5.00g of ethanol is added to 15.0g of water, what is the % concentration of ethanol in water? THANKYOU

**English - Macbeth**

Think about Macbeth’s position at the conclusion of Act III. In what ways has his ambition, which allowed him to obtain the Scottish throne in the first place, begun to be detrimental to him? Cite specific examples from the play in your response. What does this question m...

**math**

16-4+1 = 13 13 to the 2nd power = 13 *13 13 * 13 = 169

**English**

I just finished reading Macbeth for school. My teacher assigned a essay for us to do. She asked if we think the witches' predictions were right or if the witches' predictions were disappointing because of duality and doublespeak. I said that I believe in neither and I ...

**math**

the answer ie 30

**Math**

$307,$330,$440,$405 (range

**chemistry**

A 1.00-L sample of dry air at 25 °C contains 0.0319 mol N2, 0.00856 mol O2, ... The main components of dry air, by volume, are N2, 78.08%; O2, 20.95%; Ar, ... by volume, of the following main gaseous components: N2, 74.1%; O2, ... What is the partial pressure of each gas i...

**allied health part 2**

I go to a medical high school, so this isn't to unfamiliar, but aren't C and D both medical care operations? I'm leaning towards D....

**Physiology**

The BP cuff constricts arteries and veins, so when the blood pulses to try and get through, that's what you'd hear. (The pounding) If that makes sense....?

**Chemistry**

Calculate the amount of heat required to raise the temperature of a 33 g sample of water from 6 Celsius to 24 Celsius.

**stereotypes in psychology**

Sorry. But who generally fit these based off of beliefs.

**stereotypes in psychology**

are good dancers. drive Hummers. have more fun. are great lovers. cause trouble. are ditzy. are on welfare. live off other people. have hot tempers. are good with money. drink a lot. eat a lot.

**statistics**

Among 17 metal parts produced in a machine shop, 6 are defective. If a random sample of four of these metal parts is selected, find: (a) The probability that this sample will contain at least three defectives. (Do not round the intermediate answers. Round your answer to 4 deci...

**Logarithms**

Solve for x: {{{ln(x)+x=5}}}

**calculus**

determine the dimensions of a rectangular solid (with a square base) with maximum volume if it's surface area is 289 meters

**World history**

Try and do your own homework instead of posting the whole worksheet onto here

**Geometry**

Solve for x: 2 to x+1=x+2 to 3 or 2 to x+3= x+2 to x+5 (the proportions end up being the same in the end) I keep getting to the part after you FOIL, and then I get stuck

**math**

Well, when you know how many hours, you multiple that by 2 (for both days he will work), and then the answer to that by his salary of a whopping $750.

**math**

I agree. He surely doesn't work 24 hours a day for 2 days straight with a $750 salary? Come to think of it, I might if I made that much an hour!

**elapsed time**

I'm sorry 10:52 - 2:37 = ____ PM PM not AM :)

**elapsed time**

Subtraction is key! 10:52 - 2:37 = ____ AM? Solve it to find the answer.

**elapsed time**

2:48

**math**

Specify please??

**English**

On most you can say "References provided if needed" Normally size 12 font, it's standard for most.

**English**

It means what might affect you and just you in a big way might have "ripple effects" on everyone else. Like dropping a pebble into water. It affects the immediate space where the pebble landed in a big way (SPLASH), but the whole area around it is still affected, but...

**Islam in India...Economic effects?**

Thank you I have a bit more information now

**Islam in India...Economic effects?**

Thank you! For more specified information, I'm studying it from around 962-12th/13th century Ahhh AP work =[

**Islam in India...Economic effects?**

What economic effects did Islam have in India? I'm having a tough time finding any info for an ESP (Economy, Society, Politics) chart in my book. Any info is welcome and thanked :)

**Psychology**

I quote: "In a 1893 ruling, the U.S. Supreme Court declared that "children under the age of 7 years could not be guilty of felony, or punished for any capital offense, for within that age the child is conclusively presumed incapable of committing a crime." This ...

**Psychology**

These are not my words: "In the US, no. Children 6 yrs old can not be held responsible for their actions. They may be remanded, by the juvenile court to a psychiatric hospital, if they are found to be a threat to themselves or others, up to the age of 18 to 21 yrs old, de...

**Psychology**

In the context of criminal intent -- a 6 year old is considered an infant. Every state has a state penal code section that defines "infant" as it relates to criminal intent and the law. Here's a sample: California Penal Code Section 26 All persons are capable of ...

**reading**

Ahahaha Ms. Sue! Well, she gave you a paragraph. This isn't so hard. Just sit down and open up a dictionary :)

**Physics helpp please!**

A 8000-kg freight car rolls along rails with negligible friction. The car is brought to rest by a combination of two coiled springs as illustrated in the figure below. Both springs are described by Hooke's law and have spring constants with k1 = 1700 N/m and k2 = 3700 N/m....

**AP Chemistry**

A mixture of aluminum and zinc metal is used in 2 experiments described below: A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and 25...

**AP Chemistry**

Okay, thank you so much! You really know your chemistry

**AP Chemistry**

Where does the Al(OH)3 come from and how do you know and how do you tell how much of the 2.70g of ppt is Al(OH)3 or Zn(NH3)4^+2?? Thanks

**AP Chemistry**

Im mainly confused on how you know what amount of aluminum or zinc is in the samples of the mixture

**AP Chemistry**

A mixture of aluminum and zinc metal is used in 2 experiments described below: A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and 25...

**Chemistry**

Determine the final concentration of 20ml of 5M NaCl of solutions after 30ml of water has been added.

**Physics**

A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 600 N. As the elevator later stops, the scale reading is 396 N. Assume the magnitude of the acceleration is the same during starting and stopping. A)Determine the wieght of t...

**english - Contrast Advertising**

What are some companies that sell produtcs to the average consumer?

**english**

what does this quote mean "We'll have to tighten the belt a little bit and make due"

**science**

what r some good websites to look up river streams ponds lakes wetlands marsh and swaps plants and animals

**math **

try (20*4)+(20*3)

**chemistry**

will the pH be 11.20

**chemistry**

Can you give the steps for working this?

**chemistry**

a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine, Kb=3.72*10^-4 and the vapor pressure at 25C is 215 torr. (a)What should be the pH of the aqueous solution? (b) How many mg of NaOH dissolved in 0.500...

**essay**

What are some suggestion regarding should the driving age be raised to 18?

**Physics**

A certain piece of wire has a resistance of 250 ohms. if the wire is cut in three pieces and the cross sectional area of each piece is halved, what is the resistance of each piece?

**geometry**

Quadrilateral QRST has two pairs of congruent sides, but it is not a parallelogram. What figure is it? What further condition would it have to satisfy to be a parallelogram? A. The figure is a square. To be a parallelogram, it would have to have pairs of opposite congruent sid...

**geometry**

Can you prove ABCD is a parallelogram based on the given information? Explain. Given: x = 5, y = 4 Prove: ABCD is a parallelogram. A. The figure is a square. To be a parallelogram, it would have to have pairs of opposite congruent sides, not just congruent sides. B. The figure...

**calculus **

How do I find the x values at which the tangents to the graphs f(x)=2x^2 and g(x)=x^3 have the same slope?

**Chem- PLZ HELP!**

Ok that looks wrong. 100g should be under solution for the mass, 18.02g/mol for the solvent of H2O and 85g/mol for the solute of NaNO3. I have to find mass of solute and solvent and the moles of solute and solvent. Pls help anyone!

**Chem- PLZ HELP!**

Consider 100g of 5.5% (mass) solution of NaNO3. Complete the following table, before calculating molarity, molality and mole fraction of NaNO3. Solute(NaNO3)|Solvent(H2O|Soln Mass(g) 100g Moles ---- RefInfo 85g/mol 18.02g/mol Density=1.00g/mol (This goes under "soln"...

**english **

what are some Controversia topics in regards to what is happening in the news currently?

**SCience**

Would you want someone looking through CLEAR GLASS at you? I think not. . .

**Saint Louis University**

He probably misread it to be "your school"

**World History**

I actually have a fairly good paragraph for the cultural aspect, but I'm not so sure where I should start for it economically. . . .

**World History**

How did a newfound sense of commercialism aid in the development of Europe as global power culturally and economically during the modern period?

**chemistry**

2.) Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of A is mixed with one ...

**chemistry**

2.) Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of A is mixed with one ...

**calculus**

The antiderivative of arctan(4t)dt by integration of parts.

**english**

What are some product that are essential to your quality of life besides cell phones and ipod

**chemistry**

The specific heat of the dilute NaCl solution formed during the neutralization of the HCl is about 2% less than the 4.184 J/k g assumed in the calculation for the molar heat of neutralization of the acid. How will this affect your final result for the heat of neutralization?

**geometry**

Width of label=height of can=8 cm Length of label=circumference of can=2*pi*radius or pi*diameter. Circumference=7*pi, this is the length of the label also.

**Advertising-HELP**

How about the KY ads? They're a little much.

**Physics**

A 20.0 g marble sliding to the right at 58.8 cm/s overtakes and collides elastically with a 10.0 g marble moving in the same direction at 14.7 cm/s. After the collision, the 10.0 g marble moves to the right at 73.5 cm/s. Find the velocity of the 20.0 g marble after the collision.

**chemistry**

The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. °C results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to that of pure water. ...

**math **

This requires trig. The sine of an angle is the (opposite side)/(the hypotenuse.) So sin(38) = 36/x. x = 36/sin(38) You can type that in your calculator. Make sure your calculator is in degree mode.

**chemistry**

2.) A 48 g sample of water at 75 °C is mixed with 32 g water at 18 °C. Find the temperature of the mixture.

**Survey of Math 140**

sorry. you could try changing the 80 to 79 in the first part. I was debating with myself, which one to use.

**Survey of Math 140**

First calculate the number of days between March 8 and May 26. 24 days in March, 30 days in April, and 26 days in May. Add those together=80 days. 4000(1+.10)^(80/365)= 4084.44. This is how much you owe on May 26, before the $1300 payment. Then subtract 4084.44-1300. This is y...

**Math **

You may want to look up "unit circle" on google. There's an excellent picture with all the angles and their measures labeled.

**Math **

When you draw the angle in standard position, the ray will be in the second quadrant. Draw a line segment from the end of the ray down to the x-axis to make a triangle. The reference angle is pi/3. Along the horizontal part of the triangle write -1/2. Along the vertical part o...

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