Saturday

November 1, 2014

November 1, 2014

Total # Posts: 434

**Chemistry 400/ Chem 1A**

Assuming that the resolution of an electron microscope is equal to the deBroglie wavelength of the electrons used, what is the resolution of an electron microscope (in nm) when the electrons are accelerated to a speed of (5.60x10^5) m/s?
*October 29, 2014*

**NH4NO3 explosive?**

Ammonia is used in its anhydrous form gas and the nitric acid is concentrated. This reaction is violent owing to its high exothermic nature.
*October 6, 2014*

**NH4NO3 explosive?**

Yes it is. it is used at mining
*October 6, 2014*

**Calculus**

A light is hung 15 ft above a straight horizontal path. If a man 6 ft tall is walking away from the light at the rate of 5 ft/sec, how fast is his shadow lengthening and at what rate is the tip of the man’s shadow moving?
*October 6, 2014*

**Chem 400**

Direct reaction of solid iodine (I2) and gaseous chlorine (Cl2) produces an iodine chloride,(IxCly), a bright yellow solid. 0.678 g of iodine (I2) is mixed with 0.851 g of chlorine (Cl2). After the elements react, some chlorine is left over along with a single compound that ...
*October 1, 2014*

**Chemistry**

M1V1=M2V2 so 0.1 M x 1.5 L= 2.52 x ?L ?L of 2.52 M stock solution= 0.05 L To find out how much water you need to add just subtract 1.5 L of original solution from 0.05 L. so 1.5 L - .05 L = amount of water in L then just convert you answers to mL.
*October 1, 2014*

**Chem 400**

What about microliter conversion to ml?
*October 1, 2014*

**Chem 400**

A 55 uL of hexane is injected in a mass spectrometer. how many protons are in the 55 uL injection? (density Hexane= 0.6548 g/mL)
*October 1, 2014*

**Chemistry**

Yeh its 14.9 lb/in^2
*September 24, 2014*

**Chemistry**

Assume that the width of your body (across your shoulders) is 50.8 cm inches and the depth of your body (chest to back) is 25.0 cm. If the atmospheric pressure is 14.9lb/in^2, what mass of air (lb) does your body support when you are in an upright position?
*September 24, 2014*

**Chemistry 400/ Chem 1A**

I got 4.854 g of H2SO4. Thank you so much. I did it right the first time just has trouble understanding the problem in my head. To find grams of excess reactant I just have to convert moles of ethanol to g right?
*September 15, 2014*

**Chemistry 400/ Chem 1A**

A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows: 4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20 What mass of sulfuric acid is consumed in this reaction, assuming that...
*September 15, 2014*

**physics, math**

Part A & B are 0.10m apart. A point charge of +3.0*10^-9C is placed at A and a point charge of +1.0*10^-9C is placed at B. X is a point on the straight line through A and B. If a third charge C or charge 1.5*10^-9 is placed at X, where must X be for the resultant force to be ...
*September 14, 2014*

**algebra**

1. x=Y/2+3 2. y= -y/2 - 1/3
*August 21, 2014*

**Math Question**

Five students measure their height using different units. Andrew is 176 cm, Brittney is 5'4", Calvin is 1.8 yards, Don is 54 inches, and Elisha is 1.6 metres. Arrange the students from shortest to tallest. I don't know how to deal with different units! A truck ...
*July 18, 2014*

**science**

A force of 20 n gives a ball an acceleration of 4.0 m/s3 on a lever frictionless surface. what is the mass of the ball?
*June 17, 2014*

**Physics**

A 250g wood block firmly attached to a horizontal spring slides along a table with a coefficient of friction of 0.40. A force of 30.N compresses the spring 20cm. If the spring is released from this position what will be the block's speed when it passes equilibrium position?
*June 4, 2014*

**physics**

help?
*May 15, 2014*

**sitcom analysis**

raising hope: what does jimmy see in sabrina?
*April 24, 2014*

**sitcom analysis**

why does jimmy feel his relationship is doomed? raising hope:
*April 24, 2014*

**statistics**

only be is right! the other parts are wrong
*April 15, 2014*

**Precalculus**

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of -0.4 . Suppose that the height of the candle after 13 hours is 24.8 centimeters. What was the height of ...
*March 24, 2014*

**trig**

Find csc(theta), tan (theta), and cos (theta), where theta is the angle shown in the figure. Give exact values, not decimal approximations c=10 b=7 a=7.14 the right angle is locate between sides a and b and the theta angle is an acutle angle sides b and c. i have sin theta as ...
*March 24, 2014*

**trig**

Suppose that Magnus' blood pressure can be modeled by the following function {{{p(t)=83-18sin(71pi*t)}}} Magnus' blood pressure increases each time his heart beats, and it decreases as his heart rests in between beats. In this equation, p(t)is the blood pressure in ...
*March 23, 2014*

**Applied Math (Biological application)**

I basically need help finding the rest of the solutions.
*March 19, 2014*

**Applied Math (Biological application)**

The deformation y(t) of heart muscle from its rest position after t seconds can be modelled as a spring-mass system, described by the differential equation: my" + vy' + ky = F(t) where m, v, and k are positive constants denoting the mass of the myocardial tissue, and ...
*March 19, 2014*

**Trigonometry**

Looks like its a triangle within a triangle problem. Still researching to try to find out how to solve
*March 18, 2014*

**Trigonometry**

figures above are correct not sure why it has me listed as Stephen. Also, hypotenuse of CB is 2537.98496522845. they are two attached triangles. CAB is the outermost triangle. CD is the opposite side of both triangles. CAD with the angle of 32 degrees. CAD has a hypotenuse of ...
*March 18, 2014*

**Trigonometry**

Mountain officials want to build a new ski lift from B to C as shown in the figure below. The distance from A to C is 1480 feet. They measure angle DAC to be 32 degrees and angle DBC to be 18 degrees. What is the distance A from to B? Round your answer to the nearest tenth of ...
*March 18, 2014*

**English**

Thank you Ms. Sue... Thank you Emmanuel
*January 25, 2014*

**English**

I am 3/7 of a chicken,2/3 of a cat and 2/4 of a goat. What am I?
*January 25, 2014*

**math**

4x7-9^4= please help me im super stuck
*January 14, 2014*

**evolution article. Please help!!!**

Hi , I am having a very difficult time finding an article that contains a misconception about evolution . The article had to be be published within in this past year. Please help !!! thank you!!
*November 29, 2013*

**Physics**

A 55.0kg cheerleader uses an oil-filled hydraulic lift to hold four 130kg football players at a height of 1.20m. If her piston is 19.0cm in diameter, what is the diameter of the football players' piston?
*November 14, 2013*

**phyics**

A hand exerciser utilizes a coiled spring. A force of 86.9 N is required to compress the spring by 0.0231 m. Determine the force needed to compress the spring by 0.0432 m.
*November 12, 2013*

**phyics**

An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from it.
*November 12, 2013*

**phyics**

When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 5.0 x10-7 m and a maximum speed of 3.3 x10-3 m/s. (a) What is the frequency (in Hz) of the eardrum's vibrations? (b) What is the ...
*November 12, 2013*

**phyics**

An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from it.
*November 12, 2013*

**phyics**

A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 1.1 m/s. Determine the amplitude A of the motion.
*November 12, 2013*

**phyics**

An object in simple harmonic motion has an amplitude of 0.202 m and an oscillation period of 0.620 s. Determine the maximum speed of the motion
*November 12, 2013*

**math**

celeste hiked 1.8 miles in 0.75 hour. What is her average rate of speed?
*November 10, 2013*

**Science **

How long will a skateboarder be out if they decide to travel for 654 meters with a velocity of 1.2 m/s
*November 5, 2013*

**Statistics**

A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution, with a population standard deviation of 5.10 gallons. A random sample of 60 days shows that the mean daily ...
*October 27, 2013*

**math**

25/5 -4 * 2/9
*September 5, 2013*

**math**

express each answer in exponential form using the indicated bases 4x4x4x4,base 2
*June 25, 2013*

**biology**

what is answer
*May 28, 2013*

**math**

order the fractions 1/3 2/5 2/9 1/3 and 4/1 from least to greatest
*April 23, 2013*

**physics**

4(a) What is the magnitude of the gravitational force of the Earth on a surveillance satellite of mass 1040 kg that is in a grazing circular orbit 100 km above the surface of the Earth. (b) Find the magnitude of the acceleration of a satellite in such a grazing orbit. (c) ...
*April 22, 2013*

**3rd grade math**

they are all bigger than 2/5
*March 20, 2013*

**math 3rd grade**

hey bud, the rule is y=x ... input x =1 and output y = 1 then 1 = 1 and y = x
*March 13, 2013*

**physics**

I still dont get it. cna you explain
*March 10, 2013*

**physics**

At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.60%?
*March 10, 2013*

**english**

one purpose of the summary is to ?
*March 2, 2013*

**science**

Suppose that the 1.3 km span of the golden gate bridge had no expansion joints. Calculate how much longer the bridge would be if the temperature of the bridge increases by 35 degrees celsious
*March 1, 2013*

**physics**

The four tires of an automobile are inﬂated to a gauge pressure of 1.7 × 10 5 Pa. Each tire has an area of 0.023 m2 in contact with the ground. Find the weight of the automobile. Answer in units of N
*February 12, 2013*

**physics**

A bicycle wheel has a diameter of 57.7 cm and a mass of 2.66 kg. The bicycle is placed on a stationary stand and a resistive force of 156 N is applied tangent to the rim of the tire. Assume that the wheel is a hoop with all of the mass concentrated on the outside radius. In ...
*February 8, 2013*

**Science**

What is electrolysis and what is the purpose of it? Is it dangerous?
*January 23, 2013*

**Biology- check my answer (diff one)**

Which of the following are true concerning living things? Check all that apply. A)They contain a vital force absent in nonliving things. B)They are composed of molecules that contain carbon-carbon bonds. C)They undergo chemical reactions to use energy they acquire from the ...
*December 19, 2012*

**math**

ms sue can you check my answers please?!?!
*December 19, 2012*

**Biology-check my answer**

can someone PLEASE check this?
*December 19, 2012*

**Biology-check my answer**

Hershey and Chase used the 35S isotope to label proteins. How does this isotope differ from the 32S isotope found in greatest natural abundance, and why did they choose 35S instead of 32S? A)35S has more protons than 32S; Hershey and Chase used it because it has a greater mass...
*December 19, 2012*

**geometry**

Find the slope between the two points and then use whichever point and plug it into this equation: y-y1 = m(x-x1) where y1 and x1 are the coordinates of whichever point you pick and m is the slope
*December 13, 2012*

**calculus**

Yes
*December 13, 2012*

**calculus**

y=x^3?
*December 13, 2012*

**math**

The formula is: P(1+r)^n Where p is the principal amount (or amount you start with) r is the rate (.076) and n is the frequency in years
*December 13, 2012*

**math**

I don't think you asked a question
*December 13, 2012*

**math**

Multiply 11x5x4 = 220.
*December 13, 2012*

**Geometry- Preferably Ms. Sue**

No disrespect intended, but you disproved your point with those links Ms. Sue. The second link, at the very bottom it asks this question: Example: A rhombus has diagonals of 6 m and 8 m, what is its Area? Squares have equal diagonals.
*December 13, 2012*

**Geometry- Preferably Ms. Sue**

In order for it to be a square, the diagonals need to be the same length. In a parallelogram (if you are talking about a rhombus), they do bisect, but the diagonals are not equal in length.
*December 13, 2012*

**Geometry- Preferably Ms. Sue**

Its B, sorry for not being Ms. Sue
*December 13, 2012*

**Help please!!health**

Yes. Children can catch a lot of diseases really fast due to the lack of a proper immune system.
*December 13, 2012*

**math hurry please**

Easiest way, SAT tip of the day... Is to plug each answer in and see which works.
*December 13, 2012*

**Science**

I've never seen anyone use g/cc before. The usual standard is g/L as they are the standard metric values. However you can definitely use g/mL if used properly.
*December 13, 2012*

**math**

In order to void the absolute value bars, it needs to stand by itself. So 4=|x-3| Now get rid of the value bars and you get: 7 = x Plug it in and see !
*December 13, 2012*

**ap world history**

I'm just giving back ;)
*December 13, 2012*

**ap world history**

Definitely. If you want to be more in depth, you can also include the cultural extent! But I'm sure that's a little too much
*December 13, 2012*

**ap world history**

Now it's been a while.. But I'm guessing the nature of an empire is similar to the nature of an animal or human. Like human nature, is our human tendencies. So in a similar fashion, the nature of an empire would be the tendencies of an empire: were they more trade ...
*December 13, 2012*

**Business Ms.Sue**

Well I've never taken a business class... but I think it would depend on the sales coming from wholesale or retail. If there was more wholesale, he would have to incur more expenses initially due to the fact that he wouldn't get paid until the end of the month, ...
*December 13, 2012*

**Differential Calc (Math)**

WOW! Thank you so much! You rock!
*December 13, 2012*

**Differential Calc (Math)**

Hm... Never learned this before, so I'm not quite sure if I can use this. However, I appreciate the effort!
*December 13, 2012*

**Differential Calc (Math)**

I'm not quiet sure how e^2x equals what you put, and lim (1+3x)^1/(3x) = lim (1+u)^1/u = e doesn't seem to make sense either.. Maybe a more dumbed down version? And it is in fact ^1/(3x)
*December 13, 2012*

**Differential Calc (Math)**

Stuck... can't seem to use l'hopitals, nor can I use logrithmic differentiation... lim (e^(2x)+ x)^(1/3x) x->0+ Thank you so much
*December 13, 2012*

**Algebra help**

This is one of those problems where you have to set up the peppers as variables. Lets say green peppers are "x" and red peppers are "y". You can then make up a systems of equations to solve for each variable. Dave: 3x + 2y = 3.45 and Ruth: 4x + 3y = 5.00 ...
*December 13, 2012*

**science**

You didn't give me the scenarios, but I'm assuming that you want the other variable? Since yellow is dominant, the only way to get green is to have two recessive's.
*December 13, 2012*

**math**

Is it possible to have a figure an area of 9 square units and a perimeter of 30? If not, why? (PS I dont think it is possible.)
*December 6, 2012*

**History**

i have no clue what so ever so ya sorry !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*December 5, 2012*

**Physics**

A ball is thrown straight up in the air at an initial speed of 30 m/s. Using conservation of energy, find the maximum height of the ball.
*November 20, 2012*

**statistics**

Which of the following is NOT true with respect to the properties of probability? 0 < x < 1 P(S) = 1, where S is the sample space P(A) + P(Ac) = 0 If two events are independent then P(A and B) = P(A) * P(B)
*November 15, 2012*

**statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 15, 2012*

**statistics**

Which of the following is NOT true with respect to the properties of probability? 0 < x < 1 P(S) = 1, where S is the sample space P(A) + P(Ac) = 0 If two events are independent then P(A and B) = P(A) * P(B)
*November 14, 2012*

**statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 14, 2012*

**Physics**

A file cabinet weighing 1500 N is at rest on the floor. The coefficient of static friction between the floor and the cabinet is 0.5. What is the minimum force required to make the file cabinet move horizontally
*November 9, 2012*

**trig**

A tree growing on a hillside casts a 121-foot shadow straight down the hill. Find the height of the tree (in feet) if the slope of the hill is 8 degrees and the angle of elevation of the sun from the horizontal is 50degrees.
*November 5, 2012*

**Differential Calc**

If: 0 = f(1) = a+b+c+d 2 = f(-2) = -8a+4b-2c+d 0 = f'(1) = 3a+2b+c 0 = f'(-2) = 12a-4b+c "since we now have four equations and four unknowns, we can determine unique solution. Solving for "a" and "b", a=, b=" Please show the steps, I am so...
*November 5, 2012*

**Algebra**

If you're not sure how I got that, be sure to ask!
*October 20, 2012*

**Algebra**

x = 3
*October 20, 2012*

**World History Please Help ASAP Ms. Sue?**

I was talking about thesis for the topic not really how to write a thesis statement.
*October 19, 2012*

**World History Please Help ASAP Ms. Sue? **

I am doing a research paper on the opium wars in China. Any suggestions for key points for thesis statement?
*October 19, 2012*

**Science**

111/23 = Temp per degree or x x(475)= ?
*October 18, 2012*

**math**

Multiply 360 by the percentage which in decimal form is : .07 360(.07) = ???
*October 18, 2012*

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