Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 929

**physics please help**

A 8.6 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 186 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.

**Physics**

A ski gondola is connected to the top of a hill by a steel cable of length 620 m and diameter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 14 s for the pulse to travel the len...

**Physics**

A mass of 1.66 kg stretches a vertical spring 0.312 m. If the spring is stretched an additional 0.136 m and released, how long does it take to reach the (new) equilibrium position again?

**Science**

How many atoms of aluminum can be produced by the decomposition of 47.1 g of Al2O3? (Hint: Write and balance the equation first.) The products are oxygen gas and aluminum metal (Al) A) 1.11 X 10^24 Al atoms B) None of these C) 1.39 X 10^23 Al atoms D) 5.56 X 10^23 Al atoms E) ...

**physics**

A 0.01-kg baseball traveling in a horizontal direction with a speed of 12 m/s hits a bat and is popped straight up with a speed of 15 m/s. (a) What is the change in momentum (magnitude and direction) of the baseball? (b) If the bat was in contact with the ball for 26 ms, what ...

**physics**

An object of mass 4.3 kg is projected into the air at a 45° angle. It hits the ground 3.8 s later. What is its change in momentum while it is in the air? Ignore air resistance.

**physics**

A 0.105 kg baseball is thrown upward with an initial speed of 12.0 m/s. (a) What is the force on the ball when it reaches half of its maximum height? (b) What is the force on the ball when it reaches its peak?

**physics**

its not 9.8 or 9.81, ive already tried that

**physics**

A 2.22 kg book is dropped from a height of +3.2 m. What is its acceleration? can you help?

**Calculus**

Your problem doesn't state the original population, so you need to rephrase your homework question to give all the information. You can use a program like Winplot to plot this function, and pick off the relevant data.

**calculus**

Lim= x-Infinite x+0/(x2+1)=? please show work

**Physics**

never mind, found the mistake I was making.

**Physics**

Using the definition of the scalar product, find the angles between the following pairs of vectors. A = - 4 i + 2 j + 2 k and B = - 3 j - 3 k I understand to do [(A).(B)]/|A|*|B| = cos theta; but I'm getting 0 for |A| and don't know how to access it from there.

**calculus**

A particle moves along the curve y=square sqrt 1+x^3. As it reaches the point (2,3), the y-coordinate is increasing ata a rate of 4cm/s. How fast is the x-coordinate of the point changing at that instant?

**physics**

73.5 miles south

**science**

Name some ways the wind and rain change the Earth's top layer(soil).tell why?

**9th grade**

Use the distributive property to simplify: 25(2x + 1/5).

**Check a chemistry answer**

So I think I have done this problem right, I was just wondering if anyone would check over it for me. What mass (in grams) of P2O5 contains 1.20 x 1023 atoms of phosphorus? 1.20E23 atoms of P x (1 mol/ 6.022E23 atoms) x (5 mol O/ 2 mol P) x (1 mol P2O5/ 5 mol O) x (79.995g/ 1 ...

**science**

can you list the things that causes weathering?Please.

**Algebra**

What is the domain of the function f(x) = square root of (12x-24) I don't get this concept and I have a ton of these problems-can you please explain how to get it Thank you

**buisness and tecnoligy**

How can lean manufacturing and near-sourcing help a company gain a competitive edge and prepare for the future

**social studies**

New York city is located in the northeastern part of the united states.It has an area of 47,377 square miles and a total inland water area of 1,731 square miles.New York city is one of the 62 counties of New York state and is consist of many road and railways.The capital of Ne...

**social studies**

I think New york is located more to the south of the map. Its capital is Albany and it sits at the mouth of the Hudson River.

**social studies**

by helping me write the paragraph

**social studies**

write a paragraph describing the location of the New York City on the map of the New York State using compass rose

**Physics**

A 6-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2430 N for 0.1 s. One piece of mass 2 kg travels backward at a ...

**Physics**

A bob of mass = 0.250 is suspended from a fixed point with a massless string of length = 23.0 . You will investigate the motion in which the string traces a conical surface with half-angle = 25.0. What tangential speed must the bob have so that it moves in a horizontal circle ...

**Physics**

A bob of mass = 0.250 is suspended from a fixed point with a massless string of length = 23.0 . You will investigate the motion in which the string traces a conical surface with half-angle = 25.0. What tangential speed must the bob have so that it moves in a horizontal circle ...

**social studies**

Can you please help me write a funny story using these ten(10) words,about,shape,house,urban,suburban,value,what,when,contrast and said.

**chemistry **

What is the total vapor pressure4 at 20° C of a liquid solution containing 0.30 mole fraction benzene, C6H6, and 0.70 mole fraction toluene, C6H5CH3? Assume that Raoult’s law holds for each component of the solution. The vapor pressure of pure benzene at 20° C is ...

**math**

if a roof has a pitch of 5 degrees and the horizontal lenght is 5.29 metres how high is the vertical?

**math**

Give your own example of a function using a set of at least 4 ordered pairs. The DOMAIN will be any four integers between 0 and +10. The RANGE will be any four integers between -12 and 5

**Amercain history **

Due to the costs of production, the major news source that would NOT emerge as a major entity until the creation of cable television would be: Answer ABC. FOX. CBS. NBC.

**College Chemistry**

In this lab: we demonstrated the method of evaporation of a saturated sodium chloride solution. The following question ask: 1) why is sodium chloride chosen for the solute? 2)Suggest reasons why the following were not chosen for the solute? a)Calcium carbonate (CaCO3)= b)Sodiu...

**vocabulary**

a group of similar things together is called?

**4th grade**

what part of speech is batteries

**social studies**

thats what i thought too but I just used Monarchs for the king question and the colonies for Colubus founded the first spanish "colony" in the americas. appreciate the help

**social studies**

middle passage monarch missionary mayflower compact northwest passage colony city-state conquistador parliament ..thanks for the help

**social studies**

profits from trade helped strong ??? develope in east africa

**7th grade social studies**

in the feudal system of Europe, lords owed their loyalty to the ???

**graphing an equation**

how would you graph 12x-3y=7 and x=2+13y?

**college**

explain why the graph of f(x)=(x+3)^2-4 looks similar to graph of f(x)=x^2

**calculus**

Use the ratio test to determine whether each series is convergent or divergent. 4/(1*2*3) + 8/(1*2*3*4) + 16(1*2*3*4*5) + ... How exactly do I do this? The example problem says to first find the nth term, but I don't know how. Help is much appreciated.

**Algebra**

Please Help me with this!

**Algebra**

Find the variation constant and an equation of variation where y varies directly as x and y=50 when x=10

**Battle of jericho(book0**

the hazing was all the stuff the warriors of destruction put on him and made him do.

**Battle of jericho(book0**

i have but i didnt understand it.

**Battle of jericho(book0**

what is the tragedy in the book? i cant find it !

**statistics**

In a contest in which 8 contestants are entered, in how many ways can the 5 distinct prizes be awarded?

**statistics**

In a class of 50 students, 31 are Democrats, 13 are business majors, and 3 of the business majors are Democrats. If one student is randomly selected from the class, find the probability of choosing a Democrat or a business major.

**Chemistry**

2.7×10−39 atm

**advenced functions**

determine the exact value of 3^-1 -2(1/8)^-2/3

**advanced functions**

the height in meters, of a passenger on a Ferris wheel is given by the function h(t)=11-10cos(0.1pit), where t is the time in seconds. How long will it take a passenger to reach a height of 5 meters the first time? Express your answer to 3 decimal places.

**advanced functions**

simplify the rational expression x^4+3x^3-2x^2-6x/x^3-2x stating all restrictions on the variable.

**Physics**

(iv) A tangential force of 20N is applied to one of the masses in the plane of rotation of (iii) above for 3.0 s . (Both the instantaneous velocity of the mass and the applied force are pointing in the same direction at all times). What is the final angular velocity of the rod...

**Physics**

thats great thanks very much (ii) Using the parallel-axis theorem or otherwise, find the moment of inertia of the dumbbell about an axis through one of the masses but perpendicular to the rod and for this question i need : I = Ic.m. + Md2 thats right isnt it?

**Physics**

A dumbbell consists of two equal compact masses of 2 kg each, connected by a massless rod of length 0.8 metres. What is the moment of inertia of the dumbbell about an axis through the centre of, but perpendicular to, the rod? could someone just tell me how to get started on th...

**Physics**

The rigid object shown in Fig. 10-63 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. Fig. 10-63 The balls may be treated as particles, and the connecting rods have negligible mass. Determine the rotational kinetic energy of...

**math**

a landscape architect plans to enclose a 3000 square foot rectangular region in a botanical garden. she will use shrubs costing 25$ per foot along 3 sides and fencing costing 15$ along the fourth. write a function that gives the architect's total cost as a function of the ...

**math**

What is the factor or 12x^2 -78x + 93.5

**Chemistry 2**

Consider the system I2 (g) <----> 2I (g) with H=+151 KJ. Suppose the system is at equilibrum at 1000 degree celsius. In which way will the reaction occur under each of the following conditions? 1. 1 atoms are added? 2. The temperture is increased? 3. The temperature is d...

**art 101**

looking for an in-text citation for impressionism.

**Chemistry**

Andre did you bother checking that the answers were in a different order this quarter? dumb!@#$%^&. The answer is Low, High, High

**Chemistry 2**

I am still confused could you work the problem out.

**Chemistry 2**

The rate constant nearly doubles for some reaction when there is an increase in temperaure from 17 degree celsius to 32 degree celsius. Calculate the activation energy.

**Math**

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and Proportion to complete the following table. Hat Size: 6 and 7/8 Head Circumference (to the nearest 1/5 in): 21 and 3/5 Head Circumference (to the nearest cm...

**Science**

The effects are simple. Mass produced non-organic foods contain more toxins (herbicides, pesticides, fungicides and heavy metals). Hybrids between various plants have produced more allergies in people. Control of most of the food chain is now in the hands of multinational comp...

**college**

A. Send the hard disk off to have what data can be recovered, recovered and pay the $1000 bucks to have it done quickly. B. Talk with the system manager about disaster management and the need for regular backups. C. Ask all staff if by chance they may have kept copies of neede...

**Math**

Hi, how can i enter d=3.5+2sin(2pit/13),where t is time. into ti-83 calculator and sketch the graph for time 0 to 30 hours.

**Math help**

Hi again how can i get the growth factor by using exponential regression from the function Y = a(b^x) and i have calculated the value of a and b.

**Math help**

what does a and b represent in linear regression Y=aX+b.

**Math help**

thankyou

**Math help**

d=0.005s^2+0.2s where d is the stopping distance in meter and s is the speed in km per hour. use the formula to find the stopping distance when a car is travelling at 70km per hour. my answer is 38.5 is that right.

**Math **

The park has an area of about 25cm^2 on the map and a map has a scale of 1:15000. calculate the area of the park on the ground. give answer to Km^2

**Macroeconomics**

a a c d

**math**

I posted this early, I don't understand, Two angles are complementary. The sum of the measure of the first angle and one-fourth the second angle is 87.75 degrees. Find the measures of the angles? What is the measure of the smaller angle? What is the measure of the other an...

**math**

A cellular phone company offers a a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-600) + 40.95, where it is assumed that t ¡Ý600 minutes. What times will keep costs between $83.45 and $104.20? For the costs to be betwe...

**Math**

I am very confused?

**chemistry**

Which half-reaction represents reduction? Choose one answer. a. Cu → Cu^+2 + 2e- b. Fe^+2 → Fe^+3 + 1e- c. Ag^+1 + 1e- → Ag d. Al → Al^+3 + 3e-

**science**

if continental crust were thinner than its average thickness of 40 km would it depress the mantle more or less

**Math**

A manufacturer produces certain devices. The fixed cost of production is $2000. The first unit produced cost $2 and the cost per unit increases by 20 cents or each additional unit produced. What is the total cost C of producing x units?

**algebra**

for the system of inequalities y >= 2x - 1 and y <= 3x - 1, which of the following statements best descibes the ordered pair (1,1) a)The point (1,1) is a solution for y >= 2x - 1, but not y <= 3x - 1. b) The point (1,1) is not a solution for either equation. c)The ...

**algebra**

for the system of inequalities y >= 2x - 1 and y <= 3x - 1, which of the following statements best descibes the ordered pair (1,1) a)The point (1,1) is a solution for y >= 2x - 1, but not y <= 3x - 1. b) The point (1,1) is not a solution for either equation. c)The ...

**algebra **

Together, Jared's age and his grandfather's age total 100. But Jared's grandfather is 70 years older than him. How old is Jared's grandfather?

**Chemistry**

A characteristic of benzene is: C6H6 aromatic planar all of the above I think it is all of the above but I'm not sure Thank you for the assistance

**Chemistry**

Thank you-sorry I didn't think it was posted and I just posted it again

**Chemistry**

A characteristic of benzene is which of the following? C6H6 aromatic planar all of the above I think it is all of the above but I'm not sure- Thank you for the assistance-

**Geometry**

If I have 21.95 = r cubed, how do I find the r? Thank you

**medical insurnce Billing and coding**

I need a paper in apa formatt with introdution,thesis statement,outline and reference

**Math**

Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not?

**MATH**

77z

**MATH**

Use multiplying by one to find an expression equivalent to 12/11 with a denominator of 77z. I have an entire worksheet of problems like this. Could someone please explain to me how to complete this type of problem.

**Algebra2**

I can't get the right answer to this problem...what am I doing wrong? (2x-4)(x+1)^2 (2x-4)(x^2+2x+2) 2x^3+4x^2+4x-4x^2-8x-8 2x^3-4x-8 but the answer I'm supposed to get is 2x^3-6x-4 what am I doing wrong? Please help! thanks

**math estimate areas**

estimate areas of parallelogram

**Chem.**

I haven't found any "Really" good ones but this is ok webclass.lakeland.cc.il.us/iali/CHM151Folder/CHM151%20OrgChm.htm

**Statistics**

Normally distributed means that median = mean = mode. Median = 50th percentile. Does that give you answer to a?

**sms**

a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation. x + y=56 The sales representative later indica...

**algebra**

if e=1/1! + 1/2! + 1/3! ... and i = the sqrt(-1) then C = -(-1)^(3/4) sqrt(e) or (-1)^(3/4) sqrt(e) both being complex numbers

**Math(Please help)**

you get x+4

**Math**

For the graph of (3-x)/(5x+2)^3: is the following information right? x-intercept: (3,0) y-intercept: (0,0.375) vertical asymptote: x= -0.4 horizontal asymptote: y=0 increasing: (4.7, infinity) decreasing: (-infinity, -0.4) (-0.4, 4.7) concave up: (-0.4, 6.4) concave down: (-in...

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