Tuesday

February 28, 2017
Total # Posts: 538

**Engineering**

A force of 26 lb. acts through a point (4; 5; -7) ft. and is equally inclined to the positive ends of the orthogonal axes. What is the moment of this force about the origin So i'm assuming vector r is 4i+5j-7k? And using the fact that cos^2α + cos^2β + cos^2γ...

*February 12, 2012*

**Engineering**

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; -2) ft. and (-3; -2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k vector r2= (3,2,5) - (...

*February 11, 2012*

**Engineering**

Such as (2i-7k+2k) + (-2i-6j+26k)? To get to get my final vector in which I take the squareroot of the sum of the squares? Also thanks I didn't recognize my conceptual error. But I still believe it would be M1 + M2.

*February 11, 2012*

**Engineering**

Thank you, I reevaluated my work and found all the errors. Though I'm not sure sure why you would subtract M1 and M2 if you are looking for the total force applied? Wouldn't M1 + M2 make more sense in this case?

*February 11, 2012*

**Engineering**

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; -2) ft. and (-3; -2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k vector r2= (3,2,5) - (...

*February 11, 2012*

**Physics/ Engineering**

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; 2) ft. and (3; 2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k vector r2= (3,2,5) - (5,4,...

*February 11, 2012*

**chemistry**

Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3NO2(g) + H2O(`) −! 2HNO3(`) + NO(g) If 745 L of NO2 gas react with water, what volume of NO gas will be produced? As- sume the gases are measured under the same conditions.

*February 7, 2012*

**Physics**

A plane is headed east with an air speed of 294.0 m/s. The wind blows southeast at 42.0 m/s. Find the velocity of the plane relative to the earth.

*February 2, 2012*

**Physics**

A sleepy man drives a car along a straight section of highway at a constant speed of 89.6 km/h. His eyes begin to close, and his car moves at an angle of 4.90° relative to the road. For how long can his attention lapse before the car begins to move across the lane divider...

*February 2, 2012*

**Physics**

A boy tosses a football upward. If the football rises a vertical distance of 1.1 m and the boy catches it at the same point he released it, what is the velocity of the ball just before he catches it?

*January 27, 2012*

**Physics**

A football player carrying the ball runs straight ahead at the line of scrimmage and directly into a wall of defensive linemen. The ball carrier has an initial speed of 8.48 m/s and is stopped in a time interval of 0.186 s. Find the magnitude and direction of his average ...

*January 26, 2012*

**Physics**

A cyclist starts at the top of a straight slope with an initial velocity of 3.02 m/s. Five seconds later, she is at the bottom of the incline, having traveled 49.6 m. Find her velocity at the bottom of the hill and her acceleration, assuming it to be constant. (Let down the ...

*January 26, 2012*

**Calculus**

y= [(x-3)/(x^2+1)]^2 find the derivative. I know i would start off with the chain rule. but would i then continue on and use the quotient rule next?

*January 19, 2012*

**Calculus**

y= ln3x *e^2x^2 + sin5x^2 find the derivative. i know what to do. but what is the derivative of ln3x? I can plug it into the product rule then nd solve

*January 19, 2012*

**Calculus**

Correction**** I would use the chain rule. not product rule

*January 19, 2012*

**Calculus**

y= [(x-3)/(x^2+1)]^2 I know that I would use the product rule on the whole equation inside the brackets. But would i also do the quotient rule bc of the division?

*January 19, 2012*

**math**

The Answer is AB

*January 16, 2012*

**Fine Art 7**

How does The Good, The Bad and the Ugly fit into the history of the western? Be as specific and as detailed as you can be. Bring up material from the text, your own research, etc. Have you ever seen a western before? Did any of the characters conform or not conform to your ...

*December 21, 2011*

**Physics**

Two bars of identical mass are at 34 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 97 °C, ...

*December 8, 2011*

**geometry**

this diagram show isosceles trapezoid QRST. What is the length , in units of _ QS when Q x-1 and 2x-2

*December 5, 2011*

**6th grade math**

2.70 is bigger

*November 7, 2011*

**7thgrade math**

Thank you, I came up with 5/64

*November 5, 2011*

**7thgrade math**

3/4 +3/20 / 2/5 * 7/8 -1

*November 5, 2011*

**7th grade math**

Ok , I came up with 5/64

*November 5, 2011*

**7th grade math**

Can you help me understand the other question I posted. These are problems I missed the time in math class.

*November 5, 2011*

**7th grade math**

Thank you

*November 5, 2011*

**7th grade math**

8/9 \1/4

*November 5, 2011*

**Chemistry**

pH 4 is a weak acid, so there will be a relatively high concentration of H20 and H+ which makes H3O+. Therefore, there can't be a high concentration of OH-, but that concentration IS NOT 0, because the pH is not very low.

*October 22, 2011*

**English**

And no-one has answered my question. How is conference call an expression? I had the ones mentioned by Ms. Sue + "followed up"

*October 22, 2011*

**English**

I had those... How is "conference call" an idiom/expression? English is my 3rd language and I never really paid attention in English class because I know how to speak and write the language. Could you please give all expressions and idioms in the text?

*October 22, 2011*

**English**

FIND 15 EXPRESSIONS OR IDIOMS IN THIS TEXT Devils Lake, ND — WASHINGTON – Federal Emergency Management Agency (FEMA) officials today assured Senator John Hoeven and Congressman Rick Berg that the agency would work with city, county and state officials to develop a ...

*October 22, 2011*

**math**

the area of a rectangle is it length multiplied by it width

*October 11, 2011*

**Algebra**

What is 18 over 52 as a decimal rounded to the nearest thousandth

*October 9, 2011*

**Language arts**

Is "white as a ghost" an idiom?

*October 5, 2011*

**physics**

A 10.0 kg mass is 1.00m to the left of the origin, and a 20.0 kg mass is 3.00 m to the right of the origin, both on x-axis. Find the gravitational potential energy and the gravitational field on x-axis at a) x =-2.0m b.) the origin, c.) x = 4.00 (set Zero P.E @ infinity in ...

*October 2, 2011*

**earth**

A satellite moves in a circular orbit about our earth exactly four times a day. Find its orbit, radius , speed and weight.

*October 2, 2011*

**Algebra**

What is 54 over 72 in simplest form

*September 30, 2011*

**Algebra**

What is 7u+3v-4 simplified using like terms

*September 29, 2011*

**Algebra**

A cat can jump the height of up to 5 times the length of it's tail.How high can a cat jump if it's tail is 13 inches long? Please write a multiplication or division equation

*September 9, 2011*

**Math**

What is 5+7x+2x-3+6 simplified, x+y+4x-3x+2y+3y simplified

*September 6, 2011*

**Math**

What is 2x+7+5x-4-x simplified

*September 6, 2011*

**algebra**

What is 2x+7+5x-x

*September 6, 2011*

**7th grade math**

Needing to write an algebraic expression, 14 less than the quantity k times 6 Then another one, I don't understand the books answer, 35 multiplied by the quantity r less 45

*August 31, 2011*

**7th grade math**

Is "quantity of" same as a multiplication problem?

*August 31, 2011*

**science**

two identical 200 gram balls of diameter 3.0 cm are 5.0 cm apart. each carries a charge of 6.5 micro coulombs. one of the balls is realesed. find its acceleration if gravitational force is negligible small?

*August 19, 2011*

**6th grade math**

Ok thank you I did get same thing

*August 18, 2011*

**6th grade math**

2 2/3 \ 1 5/6

*August 18, 2011*

**writing**

We are working on a worksheet asking if that part of sentence is a complete subject or complete predicate

*August 17, 2011*

**writing**

Is "a newborn kitten" considered a complete subject?

*August 17, 2011*

**6th grade math**

Ok.. Understand. Thank you

*August 16, 2011*

**6th grade math**

Length of of a side of a cube, if the volume is 1000 cubic meters?

*August 16, 2011*

**6th grade math**

I don't understand is I don't know any of the side as factors

*August 16, 2011*

**6th grade math**

Length of of a side of a cube, if the volume is 1000 cubic meters?

*August 16, 2011*

**math**

find the solution of the system of equations 10x-5y=-20 and 7x-5y=-20

*August 10, 2011*

**math homework**

log 7 (80)

*July 10, 2011*

**physics**

A 2.9-m nylon fishing line used to hold up a 5.2 kg fish has a diameter of 1.4 mm How much is the line elongated?

*June 12, 2011*

**physics**

Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth : An oak barrel with a lid of area 0.25 m^2 is filled with water. Along, thin tube of cross-sectional area 5.5×10−5 m^2 is inserted into a hole at the ...

*June 12, 2011*

**english**

i need to unscramble ahootnerr.

*June 11, 2011*

**algebra**

what is t=p+3r/6. (the slash is a divided sign)

*May 24, 2011*

**geometry**

you are to design, draw and label the dimensions of 3 boxes that will hold enough detergent to do 18 loads of laundry. Each scoop of detergent does one load. The size of the scoop is 3in.x2in.x2in. all work must be shown on the work page. At the bottom of the page select one ...

*May 18, 2011*

**physics**

A car has an initial speed of 23.0 ms-1. In addition, there is also wind blowing in direction similar to the car with a force of 30 N. If the brakes are applied and the car skidded for 10 meters before coming to a halt, determine the kinetic friction of one of the car’s ...

*May 15, 2011*

**physics**

A car has an initial speed of 23.0 ms-1. In addition, there is also wind blowing in direction similar to the car with a force of 30 N. If the brakes are applied and the car skidded for 10 meters before coming to a halt, determine the kinetic friction of one of the car’s ...

*May 15, 2011*

**Women Studies**

I have to explain it in 4 sentences, i think that will get me there. thanks alot.

*April 26, 2011*

**college math 120**

50 ft per .63 sec = 79.3651 ft per sec 79.3651 ft per sec = 54.112568 mph every 10 ft the speed drops 9 mph, so 54.112568 mph - (5 x 9) = 9.112568 mph I'm not sure I understood the question completely, but I think this is the right answer.

*April 12, 2011*

**AC 323CT**

. Harold Stevenson purchased substantially all of the business assets of the Troy Creamery on January 17. As part of the purchase price he paid $200,000 for the patent on an ice cream making process. Harold also pays $20,000 for the business's goodwill and another $20,000 ...

*March 31, 2011*

**6grade math**

How many millimicrons are in 2.5 meters

*March 29, 2011*

**physics**

A 1500 kg car moving at 10 m/s is stopped by the action of its brakes. The work done by the car's brakes is ____ Joules.

*March 28, 2011*

**physics**

A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water. True or False

*March 28, 2011*

**physics**

The density of a solid ball with a mass of 231 g and a volume of 110 cm^3 is ____ g/cm^3.

*March 27, 2011*

**physics**

A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water.

*March 27, 2011*

**Trig**

(2/y+2)+(3/y)=(-y/y+2)

*March 22, 2011*

**physical science**

If the asteroid is moving at a constant speed in its orbit, does this also mean it is moving at a constant velocity? Explain your answer.

*March 21, 2011*

**physical science**

Assume this asteroid has the shape of a sphere. A rock sitting on the surface of the asteroid has a weight of 100 newtons. What would the weight of this rock be if it were moved to a distance above the surface equal to the radius of the asteroid? It may be helpful to draw a ...

*March 21, 2011*

**Chemistry**

someeone answerrr thiss s

*March 16, 2011*

**Physics**

A single conservative force F(x) acts on a 1.6 kg particle that moves along an x axis. The potential energy U(x) associated with F(x) is given by U(x) = -2.9xe-x/3 where x is in meters. At x = 3.4 m the particle has a kinetic energy of 7.2 J. (a) What is the mechanical energy ...

*March 7, 2011*

**Chemistry**

A 20.0 ml sample of an unknown HCl solution requires titration with 15.0ml of 0.1MNaOH solution to reach equivalent point. What is the concentration of the HCl solution? HCl + NaOH ¨ H2O + NaCl A. 0.000075 B. 75 C. none of these D. 0.075

*March 5, 2011*

**physics**

Anyone? ive got a test tomoz and i need this answering

*March 1, 2011*

**physics**

The table shows the power ratings of four electrical appliances. Fan heater 2 kW Oven 3 kW Kettle 2 kW Microwave oven 0.75 kW The kettle is used for a total of 30 minutes a day. It has an efficiency of 0.9 What is the cost of the energy wasted by the kettle each day? 1 0.6 p 2...

*March 1, 2011*

**physics**

Shy1236mg

*February 20, 2011*

**Accounting**

Starfax, Inc., manufactures a small part that is widely used in various electronic products such as home computers. Operating results for the fi rst three years of activity were as follows (absorption costing basis): In the latter part of Year 2, a competitor went out of ...

*February 8, 2011*

**6 grade math**

Dividing 22/7 / 5

*January 10, 2011*

**Physics**

A model airplane of mass 0.9 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.2 m, making 1.2 revolutions every 8 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the plane.) The ...

*December 21, 2010*

**Physics**

A model airplane of mass 0.9 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.2 m, making 1.2 revolutions every 8 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the plane.) The ...

*December 21, 2010*

**Math**

/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

*December 2, 2010*

**Math**

/Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

*December 2, 2010*

**chemistry**

pKa=4.5

*November 22, 2010*

**geometry**

In an isosceles triangle ABis congruent to BC. Measure of angle A is x +3y and the measure of angle C is 3x +2y. The measure of angle C is 63 degrees. Find x and y.

*November 15, 2010*

**Physics**

1. Free-fall: A ball is thrown vertically upward. What are its velocity and acceleration when it reaches its maximum altitude? What is its acceleration just before it hits the ground?

*November 10, 2010*

**Calculus I**

Consider the function f(x)=((2)/(x^2))-((3)/(x^5)). Let F(x) be the antiderivative of f(x) with F(1) = 0. Find F(3).

*November 6, 2010*

**4th grade**

if jen has X pogs then we have the following: Marty: JEN x+6 : X X+6-10 :x+10 X-4 : X+10 then to find the difference we substract X+10 -(X-4) = 14 Jen has 14 pogs more than Marty

*October 24, 2010*

**american gov**

Of the roles that the press plays in the American political system, which is it least equipped to carry out properly? a. common-carrier b. signaler c. watchdog d. public-representative e. news interpreter i think its E but im not sure

*October 8, 2010*

**math**

An adult cheetah weighs about 130 pounds. An adult mountain lion weighs about 170 pounds. A sutdent estimates that a mountain lion weighs about twice as mush c as a cheetah. Is the estimate reasonable? Explain why or why not?

*September 29, 2010*

**2nd grade**

i need a sentence with the word slid

*September 21, 2010*

**physics**

Compute the order of magnitude of the mass of (a) a bathtub filled with water, and (b) a bathtub filled with pennies. In your solution list the quantities you estimate and the value you estimate for each.

*September 20, 2010*

**Physics**

A solar still is used to make fresh water from salt water by evaporation. Assume that during a summer day that 1000 BTU/ft sq of solar energy falls on the surface of the salt water. Determine how many inches of water are evaporated in 30 days. Assume that 1040 BTUs is needed ...

*September 19, 2010*

**Physics**

A nuclear power plant generates (output) 500 mw. It is 34% efficient. The waste heat going in the Connecticut River with an average flow of 3*10 exp 4 (kg/sec). How much does the water temperature rise?

*September 19, 2010*

**Physics**

Can you do this for 3m/s^2?

*September 16, 2010*

**geometry**

Find the measure of each exterior angle of a reguler 11-gon. round your answer to two decimal places if neccesary?

*September 8, 2010*

**12th grade - Math**

1x1=1x10000+9+9+9=10027

*September 1, 2010*