Thursday

April 2, 2015

April 2, 2015

Total # Posts: 1,169

**Physics**

A stationary 3.0-m board of mass 6.0 kg is hinged at one end. A force is applied vertically at the other end, and the board makes a 30° angle with the horizontal. A 40-kg block rests on the board 80 cm from the hinge as shown in the figure below. a) Find the magnitude of ...
*April 28, 2011*

**Trigonometry**

convert polar equations to rectangular coordinates. 1.) θ=π 2.) r=6 cos θ 3.) sec θ=2
*April 28, 2011*

**Math Word Problem**

jesse bought 6 one-quarter pound bags of grape.how many pounds of grapes did jesse buy ?
*April 27, 2011*

**chemistry**

I- is converted into I2 by the addition of an aqueous solution of KMnO4 to an aqueous solution of KI. What is the oxidation number assigned to I2??
*April 26, 2011*

**Physics 203**

An object is projected upward from the surface of the Earth with an initial speed of 4.6 km/s. Find the maximum height it reaches.
*April 26, 2011*

**Physics 203**

A satellite with a mass of 310 kg moves in a circular orbit 7.00*10^7 m above the Earth's surface. (a) What is the gravitational force on the satellite? (b) What is the speed of the satellite? (c) What is the period of the satellite?
*April 26, 2011*

**physics**

Two masses m1= 35.0 Kg and m2= 15.0Kg are connected by a mass less string over a smooth pulley (no friction), the mass m1 being on a horizontal frictionless table. The motion of the system involves m1 moving horizontally to the right and m2 vertically downward, both with ...
*April 23, 2011*

**math**

For 6z=126 mike wrote that z=756 explain what mikes mistake was then tell the cor4rect answer.
*April 14, 2011*

**Physics 203**

A 2.4 m long rod of mass m1 = 11.0 kg, is supported on a knife edge at its midpoint. A ball of clay of mass m2 = 5 kg is dropped from rest from a height of h = 1.1 m and makes a perfectly inelastic collision with the rod 0.9 m from the point of support. Find the angular ...
*April 13, 2011*

**Chemistry**

thank you!
*April 11, 2011*

**Chemistry**

Explain how t make 1.5L of a 2.25M solution of H2SO4 from 6.0M stock solution.
*April 11, 2011*

**Physics 203**

5m=1/2(5/7*(9.81*sin(theta))*((2.7*sqrt(1/2))^2)/((sqrt(5/7)-sqrt(1/2)))^2) All you need to do is solve for sin(theta) you do 5*((sqrt(5/7)-sqrt(1/2)))^2)*2*7/((5*9.81*((2.7*sqrt(1/2))^2)) sin(theta)=0.00746 then you do the inverse of sin(theta) to get your degree. degree ...
*April 9, 2011*

**Physics 203**

A hollow, thin-walled cylinder and a solid sphere start from rest and roll without slipping down an inclined plane of length 5.0 m. The cylinder arrives at the bottom of the plane 2.7 s after the sphere. Determine the angle between the inclined plane and the horizontal.
*April 9, 2011*

**Physics 203**

The system shown below is released from rest. The mb = 35 kg block is 2 m above the ledge. The pulley is a uniform disk with a radius of 10 cm and mass M = 5.0 kg. Assume that the string does not slip on the pulley. (a) Find the speed of the 35 kg block just before it hits the...
*April 6, 2011*

**Physics**

A hollow, thin-walled cylinder and a solid sphere start from rest and roll without slipping down an inclined plane of length 5.0 m. The cylinder arrives at the bottom of the plane 2.7 s after the sphere. Determine the angle between the inclined plane and the horizontal.
*April 6, 2011*

**Physics 203**

A hollow, thin-walled cylinder and a solid sphere start from rest and roll without slipping down an inclined plane of length 5.0 m. The cylinder arrives at the bottom of the plane 2.7 s after the sphere. Determine the angle between the inclined plane and the horizontal.
*April 6, 2011*

**Physics 203**

A wheel has a thin 2.7 kg rim and four spokes each of mass 1.3 kg. Find the kinetic energy of the wheel when it rolls at 6.0 m/s on a horizontal surface.
*April 6, 2011*

**Physics 203**

A 4 kg block resting on a frictionless horizontal ledge is attached to a string that passes over a pulley and is attached to a hanging 2 kg block. The pulley is a uniform disk of radius 13.0 cm and mass 0.50 kg. (a) Find the speed of the 2 kg block after it falls from rest a ...
*April 6, 2011*

**Physics 203**

A 1.3-kg 10-cm-diameter solid sphere is rotating about its diameter at 77 rev/min. (a) What is its kinetic energy? (b) If an additional 5.0 mJ of energy are supplied to the rotational energy, what is the new angular speed of the ball? rev/min
*April 6, 2011*

**Physics 203 ( College)**

Equation: I=M*L^2 M is the mass of the object. I is the moment of inertia. L is the length squared or radius squared. I=(2.5^2(m2+m1))+ (2.5^2(m2+m3)) I= 6.25*(9)+6.25*(9) I=112.5 kg*m^2
*April 4, 2011*

**Physics 203 ( College)**

Four particles, one at each of the four corners of a square with 2.5-m-long edges, are connected by mass less rods. The masses of the particles are m1 = m3 = 2.0 kg and m2 = m4 = 7.0 kg. Find the moment of inertia of the system about the z axis.
*April 4, 2011*

**Physics 203 ( College)**

I don't know how to find ac, but I can help you with at and angular velocity of the disk. (a) (7.8 rad/s^2)/4.0s = 31.2=angular velocity at=7.8*.12=0.936
*April 4, 2011*

**Physics 203 ( College)**

A disk of radius 12 cm, initially at rest, begins rotating about its axis with a constant angular acceleration of 7.8 rad/s2. What are the following values at t = 4.0 s? (a) the angular velocity of the disk (b) the tangential acceleration at and the centripetal acceleration ac...
*April 4, 2011*

**Chemistry**

What is the minimum amount of ice (at 0 degress C) that must be added to 250mL of water at 23 degrees C in order to cool it to 0 degrees celsius? (Density of water= .98 g/cm^3; heat of fusion= 333J/g; heat capacity of water= 4.184J/g C; and heat capacity of ice= 1.86 J/g C)
*April 3, 2011*

**math 4th grade**

the corrct answer is 4,000,000
*March 30, 2011*

**Physics 203 **

A puck of mass 0.60 kg approaches a second, identical puck that is stationary on frictionless ice. The initial speed of the moving puck is 5.0 m/s. After the collision, one puck leaves with a speed v1 at 30° to the original line of motion. The second puck leaves with speed...
*March 29, 2011*

**English**

Oh. So on the first sentence, would the adverb be certain?
*March 28, 2011*

**English**

What is the adverb in these sentences? I got the answer, but can you check? In the past, scientists did not have much information about certain animals. Adverbs: Past, much With modern technology that has already changed. Adverbs: modern, already A cat will angrily claw. ...
*March 28, 2011*

**Math**

1) There are 3 adults per 15 students, so you can make a ratio 3adults/15students. 2) Next, set up the second ratio and combine where 3adults/15students = X/125students. X is the number of adults needed. 3) Arrange the equation by cross muliplying and you get 375 = 15X 4) X= ...
*March 24, 2011*

**6th grade math**

1) The first part of the of the problem means that for every 10 gallons of gas, you can drive 240 miles. 2) You can make a ratio where 240mi/10gal = 216mi/Xgal. 3)Then cross multiply to get 240X=2160. 4) X = 9gal
*March 24, 2011*

**math**

from 4 feet above a swimming pool, susan throws a ball upward witha velocity of 32 feet per second. how long does it take the ball to reach the water?
*March 24, 2011*

**Trigonometry**

rewrite the expression in terms of the first power of cosine. cos^3(x)sin^4(x)
*March 23, 2011*

**Math**

rewrite the expression in terms of the first power of cosine. cos^3(x)sin^4(x)
*March 22, 2011*

**Math**

Rewrite the expression in terms of the first power of cosine sin^4(x)
*March 22, 2011*

**Math**

if I have sin(6x)+cos(6x)how would I write it in terms of sin only?
*March 22, 2011*

**Trigonometry**

Yeah I got the exact value I just needed it in trigonometric function of one number which would be the degrees of cos. Thanks!!!
*March 22, 2011*

**Trigonometry**

cos(20 degrees+70 degrees) i mean
*March 22, 2011*

**Trigonometry**

so it would be cos(20+70)?
*March 22, 2011*

**Trigonometry**

ok I made a mistake in the formula. it's cos(20 degrees)cos(70 degrees)- sin(20 degrees) sin(70 degrees). so it's a subraction equation not an addition.
*March 22, 2011*

**Trigonometry**

Write the expression as a trigonometric function of one number. (cos 20 degrees)(cos 70 degrees)+(sin 20 degrees)(sin 70 degrees)
*March 22, 2011*

**acc. alg 2**

i dnt get bwat u did after x^2+5x-21=0. that is were i keep gettin stuck on
*March 20, 2011*

**acc. alg 2**

exponentiating to solve equations: solve the eaquation, cheack for extraneous solutions log5(x+4)+log5(x+1)=2
*March 20, 2011*

**English**

I have to write a story in the perspective of a 2 year old and I need a plot for the story. Any suggestions?
*March 20, 2011*

**Chemistry**

Use the chemical reaction below to answer the questions that follow. CuO(s) + H2(g) → Cu(s) + H2O(g) a. What is the limiting reactant when 19.9 g CuO react with 2.02 g H2? b. The actual yield of copper was 15.0 g. What is the percentage yield? c. How many grams ...
*March 16, 2011*

**math**

2x=x+3
*March 16, 2011*

**high school chem**

How many grams of a stock solution that is 92.5 percent h2s04 by mass would be needed to make 250 grams of a 35% by mass solution?
*March 9, 2011*

**math**

order from least to the greatest 3/10,4/5,18,20,1/20,7/10
*March 9, 2011*

**math**

fixed installment loan of $13,500 with 60 months to pay back, monthly payments of $280.24. instead of making 36th payment, pays remaining balance on loan. how much interest saved? use acturial method u= n*p*v/100+v
*February 27, 2011*

**math**

you intend to create a college fund for your baby. if you get an interest rate of 5.3% compounded monthly and want the fund to have $123,875 after 17 years, how much needs to be deposited each month? and 1 more jessica used a fixed installment loan from bank. she borrowed $13,...
*February 27, 2011*

**APUSH**

in the late nineteenth century: how could trusts purchase a senate seat? what were the sympathies of the national government like?
*February 27, 2011*

**Math**

Need to calculate the amount of building and finishing materials that you must purchase for your room. Purchases must include: Flooring Wall covering/treatment Baseboards, casing, trim Ceiling lighting In order to calculate these amounts, you must consider the following: •...
*February 24, 2011*

**physics**

A skier starts from rest 7m above the horizontal and slides down a frictionless slope the skier then hits a rough horizontal surface (uk= 0.3), How far does the skier travel along the rough surface before she stops?
*February 19, 2011*

**science**

I beleive it has something to do with cognitive
*February 18, 2011*

**world literature **

list two of the red herrings that The Thinking Machine sets up for the warden in "The Problem of Cell 13"
*February 16, 2011*

**THE AGE OF DISCOVERY TO THE AMERICAN EXPERIMENT**

. Which of the following best describes the Columbian Exchange that occurred during the Age of Discovery? A. It was a genetic shift due to population interbreeding. B. It was a cultural transformation. C. It was a religious transformation. D. It was an exchange of trade foods.
*February 16, 2011*

**algebra**

the y-coordinate of a point decreased by 3 times the x-coordinate is greater than or equal to 2. what is that written as an equation?
*February 15, 2011*

**Physics**

Sketch the velocity vs. time graph for an object that: • from 0 to 2 seconds has moved with constant velocity of 3 m/s • from 2 to 5 seconds was at rest • from 5 to 10 seconds increased its velocity, reaching 5 m/s at t =10 s. Could you please help in describing...
*February 10, 2011*

**physics**

The picture shows a uniform ramp between two buildings that allows for motion between the buildings due to strong winds. At its left end it is hinged to the building wall , at its right end it has a roller that can roll along the building wall. There is no vertical force on ...
*February 7, 2011*

**chemistry**

How many milliliters of 1.9 M HCl must be transfered from a reagent bottle to provide 24 g HCl for a reaction?
*January 27, 2011*

**Math**

i got 7/10 for my answer but i do not kno i its right.
*January 25, 2011*

**Literature- Frankenstein Novel**

Please check my answer to this question: Consider the protagonist in the novel that you read this semester. In a response of no fewer than three paragraphs, explain how this character changes over the course of the novel. Include examples of these changes in your response. ...
*January 24, 2011*

**Literature- Frankenstein**

Victor Frankenstein changed in a few of ways throughout the novel, Frankenstein. Victor changed mentally and personality wise the most. In the beginning, Victor Frankenstein starts out acting sensibly. But, the death of his mother changed him mentally. Victor became obsessed ...
*January 24, 2011*

**Literature- Frankenstein**

Consider the protagonist in "Frankenstein". Explain how Victor Frankenstein character changes over the course of the novel, Frankenstein. Please include examples of these changes in the response. I have to write no fewer than three paragraphs, so please help. Thanks...
*January 24, 2011*

**Literature- Frankenstein**

Victor Frankenstein changed in a few of ways throughout the novel, Frankenstein. Victor changed mentally and personality wise the most. In the beginning, Victor Frankenstein starts out acting sensibly. But, the death of his mother changed him mentally. Victor became obsessed ...
*January 24, 2011*

**Literature- Frankenstein**

I know that "the doomed protagonist and narrator of the main portion of the story. Studying in Ingolstadt, Victor discovers the secret of life and creates an intelligent but grotesque monster, from whom he recoils in horror. Victor keeps his creation of the monster a ...
*January 24, 2011*

**Literature- Frankenstein**

Consider the protagonist in "Frankenstein". Explain how Victor Frankenstein character changes over the course of the novel, Frankenstein. Please include examples of these changes in the response. I have to write no fewer than three paragraphs, so please help. Thanks!
*January 24, 2011*

**geometry**

rectangular prism? (brick)
*January 24, 2011*

**Grammer! Am i correct?**

Choose the answer that identifies the underlined word. Well, I must say that your ideas are quite creative. ("creative" is underlined) direct object indirect object objective complement x predicate adjective
*January 24, 2011*

**Grammer! please check my answers!**

Thank you!!!!!!!! :D
*January 24, 2011*

**algebra**

WHAT IS THE AMOUNT OF MONEY PAID OR EARNED FOR THE MONEY USED
*January 24, 2011*

**chemistry**

What is the mass of 4.80 multiplied by 10-2 moles of zinc chloride (ZnCl2)?
*January 21, 2011*

**hellppp meee**

its not in my book
*January 20, 2011*

**hellppp meee**

describe the kinds of conflicts that developed as europeans settled the americas. Anaylze the effects of these developing conflicts
*January 20, 2011*

**social studies**

describe the kinds of conflicts that developed as europeans settled the americas. Anaylze the effects of these developing conflicts
*January 20, 2011*

**algebra 2**

what are the roots of the equation v^2+8v+6=0?
*January 19, 2011*

**algebra 2**

solve by using the quadratic equation: 5x^2+3=-7x
*January 19, 2011*

**AED 204**

Thank you very much, Writeacher. I corrected the mechanical errors in my paper. Thank you again for pointing these out!
*January 16, 2011*

**AED 204**

Write a 350- to 500-word statement that reflects on how your ethnicity influences your personal behavior, attitudes, and values. While my ethnicity is important to me, it does not control me or who I am. Ethnicity can influence my personal behavior, attitudes, and values, ...
*January 16, 2011*

**World History**

Thank you.
*January 13, 2011*

**World History**

I'm trying to answer an essay question asking me to describe Islamic principles or characteristics that are unsettling when an American considers the role that Islamic extremists have played in terrorist attacks. Any idea where to look for good examples?
*January 13, 2011*

**Science**

A day on Pluto lasts 6.39 times longer than a day in earth.If an Earth day lasts 24 hour how many hours is a day in Pluto?
*January 12, 2011*

**Chemistry**

How do I determine the noble gas configuration of Sm+3? I know the normal noble gas configuration of Sm is[Xe]6s2 4f6. Thanks!
*January 8, 2011*

**Math**

A cube has a volume of 24 cubic units. What is the APPROXIMATE length of each side of the cube?
*January 6, 2011*

**math**

a 9 foot street sign casts a 12 foot shadow. the lamppost next to it castss a 24 foot shadow. how tall is the lamppost?
*January 3, 2011*

**Math**

If the sales tax is 6.5%, how much tax will you pay on a jacket that costs $48?
*December 19, 2010*

**Math**

Thank you very much :)
*December 15, 2010*

**Math**

-x^2+4x=-43 I forgot how to do this? Any help would be appreciated.
*December 15, 2010*

**Chemistry**

How do I do molarity,molality,and normality
*December 14, 2010*

**Chemistry**

How do I do molarity,molality,and normality
*December 14, 2010*

**Chemistry**

Determine the freezing point depression of H20 in 1.50 m solution of C12H22011?
*December 14, 2010*

**5th grade**

I think the answer is....x=0.5 and y=1
*December 8, 2010*

**science**

describe how radioactive isotopes decay
*December 5, 2010*

**science**

Why do I have brown eyes? can it change color?
*December 5, 2010*

**Chemistry**

1 cal = 4.184 joules Both units are kilo, sou you can just divide by 4.184 5.72kJ/4.184J = 1.367112811kcal With sig figs it will be 1.37kcal
*December 2, 2010*

**6th grade**

Yay! thanks! that helped :)
*December 1, 2010*

**Chemistry**

The element X has an atomic mass of 12.80 amu. It is known to have two isotopes 12X and 13X. Which of the following is true about the relative abundancies of 12X and 13X? a) both isotopes occur with the same frequency. b)12X occurs more frequently than 13X c)12X occurs less ...
*December 1, 2010*

**english**

PLEASE HELP!!!!!!!!!!
*November 30, 2010*

**english**

i have to make analogys for my vocab words and i need help apex:peak;________:__________ Assimilate:_____;_______:_________ interim:interval;_____:_______ and also for Meander,metropolis,momentous,obstrepous,pensive perilou'shoddy,surly,and tirade
*November 30, 2010*

**science**

sequence the steps involved in the making of the cast of a shell 1)sdiment buries shell 2)??? 3)??? 4)mold results 5)??? 6) cast results
*November 29, 2010*

**science**

create a concept web to summarize the types of presevation - thnx
*November 29, 2010*

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