Saturday

December 20, 2014

December 20, 2014

Total # Posts: 360

**Calculus**

Two ships are leaving port at the same time. The first ship is sailing due east at 20 km/hr and the other due north at 15 km/hr. How fast are the ships moving away from each other 2.0 hr later?
*March 10, 2012*

**Calculus**

A cicular metal plate is being heated and expands so that its radius increases at the rate of 0.25 mm/min. How fast is the area increasing when the radius is 10 cm?
*March 10, 2012*

**Calculus**

A closed box is to be a rectangular solid with a square base and volume of 12 ft^3. Find the most economical dimensions if the top of the box is twice as expensive as the sides and bottom.
*March 10, 2012*

**Calculus**

The strength of a beam with rectangular corss-section is directly proportional to the product of the width and the square of the depth (thickness from the top to bottom of the beam). Find the shape of the strongest beam that can be cut from a cylindrical log of diameter d= 3 ft
*March 10, 2012*

**Calculus**

Water reaches its maximum density above its freezing point. The volume V (in cubic diameters) of 1 kg of water at temperature T between 0 degrees C and 30 degrees C can be approximated by the formula V=999.87 - 0.06426T + 0.0085043T^2 - 0.0000679T^3. Find the temperature at ...
*March 10, 2012*

**Calculus**

The total charge in an electrical circuit as a function of time is given by q=t/(t^2+1) coulombs. Find the maximum charge of q.
*March 10, 2012*

**Calculus**

A box with an open top is to be made from a square piece of cardboard by cutting equal squares from the corners and turning up the sides. If the piece of cardboard measures 12 cm on the side, find the size of the squares that must be cut out to yield the maximum volume of the ...
*March 8, 2012*

**Physics**

Two identical cars (m = 1350 kg) are traveling at the same speed of 23.9 m/s. They are moving in the directions shown in the drawing. What is the magnitude of the total momentum of the two cars?
*February 29, 2012*

**Physics**

A high-jumper clears the bar and has a downward velocity of -6.00 m/s just before landing on an air mattress. The mass of the high-jumper is 50.4 kg. What is the magnitude and direction of the impulse that the air mattress exerts on her? Assume that upward is the positive ...
*February 29, 2012*

**Physics**

One kilowatt-hour (kWh) is the amount of work or energy generated when one kilowatt of power is supplied for a time of one hour. A kilowatt-hour is the unit of energy used by power companies when figuring your electric bill. Determine the number of joules of energy in one ...
*February 29, 2012*

**Physics**

A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 73 kg, and the height of the water slide is 12.0 m. If the kinetic frictional force does -6.9 × 103 J of...
*February 29, 2012*

**Physics**

A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill, as the drawing illustrates. The crest of the second hill is circular, with a radius of 38.3 m. Neglect friction and air resistance. What must be the height h of the first hill ...
*February 29, 2012*

**Physics**

The drawing shows a skateboarder moving at 5.55 m/s along a horizontal section of a track that is slanted upward by 40.9 ° above the horizontal at its end, which is 0.724 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
*February 29, 2012*

**Physics**

A roller coaster (491 kg) moves from A (1.09 m above the ground) to B (26.3 m above the ground). Two non-conservative forces are present: friction does -2.39 x 104 J of work on the car, and a chain mechanism does +5.18 x 104 J of work to help the car up a long climb. What is ...
*February 29, 2012*

**physics**

A skier slides horizontally along the snow for a distance of 22.3 m before coming to rest. The coefficient of kinetic friction between the skier and the snow is 0.0500. Initially, how fast was the skier going?
*February 27, 2012*

**Physics**

A 279 N force is pulling an 75.9-kg refrigerator across a horizontal surface. The force acts at an angle of 26.3 ° above the surface. The coefficient of kinetic friction is 0.259, and the refrigerator moves a distance of 9.14 m. Find (a) the work done by the pulling force...
*February 27, 2012*

**Physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 73.0-kg water-skier has an initial speed of 7.1 m/s. Later, the speed increases to 10.9 m/s. Determine the work done by the net external force ...
*February 27, 2012*

**PLEASE PLEASE HELP!!!!**

I'm almost getting ready 2 go 2 sleep and i really really need help. Just show me how to set the problem up and I can just solve it from there. Thanks :)
*February 15, 2012*

**Algebra-Trig Please Help ASAP**

A balloon isin the vertical plane of two consecutive milestones of a road. The angles of depression of the stones as viewed from the balloon are 15 degrees and 17 degrees. Find the height of the balloon if (a) the stones are on opposite sides of the balloon, (b) the stones are...
*February 15, 2012*

**Physics**

A penny is dropped from rest from the top of a very tall building. Assuming the height of the building is 406 m and ignoring air resistance, find the speed with which the penny strikes the ground.
*January 27, 2012*

**physics**

A jetliner, traveling northward, is landing with a speed of 65.7 m/s. Once the jet touches down, it has 817 m of runway in which to reduce its speed to 5.93 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the direction of the ...
*January 27, 2012*

**Finance**

Company A wants to issue new 20-year bonds for needed projects. The company currently has 10 percent coupong bonds on the market that sell for $1,063, make semiannual payments, and mature in 20 years. What coupon rate should the company set on its new bonds if it wants them to...
*November 10, 2011*

**geometry**

1.what is the base of the rectangle for stage # 12? 2.what is the height of the rectangle for the stage #14? 3.what is the perimeter of the rectangle for stage #10? 4.if the base of the rectangle in 36,what is the stage number?
*October 3, 2011*

**Math**

Thank you!
*July 12, 2011*

**Math**

Find the range of the data set. {11.3, 7.3, 8.8, 6.4, 9.2} Highest 11.3 lowest 6.4 11.3-6.4 = 4.9 Answer: 4.9 Right?
*July 12, 2011*

**Math**

50 degrees
*July 12, 2011*

**Math**

What is the measure of the dent angle for a star-shaped polygon 9^ 10 degrees ? A) 170° B) 30° C) 50° D) 130°
*July 12, 2011*

**math**

.63 Thanks!
*July 12, 2011*

**math**

The probability that Luis will pass his statistics test is 0.37. Find the probability that he will fail his statistics test.
*July 12, 2011*

**Math**

so false, right?
*July 12, 2011*

**Math**

True or false? Three concurrent lines can be parallel to one another.
*July 12, 2011*

**Math**

Thanks!
*July 12, 2011*

**Math**

True or False?? Although the surface area of a sphere may be decreasing, the value of the volume will remain the same. True right?
*July 12, 2011*

**Math**

What is the measure of the dent angle for a star-shaped polygon 9^ 10 degrees ? A) 170° B) 30° C) 50° D) 130°
*July 12, 2011*

**Math**

Find the number of degrees in the point angle of a {9/2} star polygon.
*July 12, 2011*

**math**

Thanks!
*July 12, 2011*

**math**

-31°F = °C -31+(-31)=-62 -62 + 33 = -35°C Answer: -35°C Correct?
*July 12, 2011*

**math**

Thanks Ms. Sue!
*July 12, 2011*

**math**

A room measures 15 ft by 19 ft. The ceiling is 10 ft. above the floor. The door is 3 ft. by 7 ft. A gallon of paint will cover 78.2 ft2 . How many gallons of paint are needed to paint the room (including the ceiling and not including the door). Round your answer up to the next...
*July 12, 2011*

**Math**

(0, -7); 2 Is this correct?
*July 12, 2011*

**Math**

Find the center and radius of the circle. x^2 + (y + 7)^2 = 4
*July 12, 2011*

**math**

Great, Thanks!
*July 12, 2011*

**math**

Write the answer to the problem as an algebraic expression. A theater ticket for adults is a dollars and the price of a child's ticket is C dollars. If 29 adults and 45 children attend the theater one night, how much money did the theater make? 29a + 45c Is this correct?
*July 12, 2011*

**Math**

How many matchsticks are needed for a 6 × 6 design? A) 42 B) 72 C) 40 D) 84 C)40
*July 12, 2011*

**Math**

Sorry, And you are right. Thanks!
*July 12, 2011*

**Math**

23/x=2 23/3=2 23 divide by 3 is not 2 So No. Right?
*July 12, 2011*

**Math**

Decide if the given number is a solution to the given equation. 24/x = 2; 3
*July 12, 2011*

**Math**

x^2 + (y-2)^2 = 25 Is this correct?
*July 12, 2011*

**Math**

Give the equation of the circle with the given center and radius. Center at (0, 2); radius = 5
*July 12, 2011*

**Math**

I don't have work. it is a Yes or No question in my exam. Q)Decide if the given number is a solution to the given equation. Yes or No
*July 12, 2011*

**Math**

6^x^2=600; 10 Correct?
*July 12, 2011*

**math**

I understand, Thanks
*July 7, 2011*

**math**

Sketch the graph of a quadratic function for which the related quadratic equation has only one solution. Then, sketch one that has two solutions. Explain how you know by looking at the graph the number of solutions there are.
*July 7, 2011*

**Math**

I got it. Thank you!
*July 7, 2011*

**Math**

4x - 18 + 18 = 65 + 18 4x = 83 4x/4 = 8 ¾ x = 8 ¾ Right?
*July 7, 2011*

**Math**

Solve each equation by using the properties of equality. Check. 4x – 18 = 65
*July 7, 2011*

**math**

Taxicab Distances Problem. Imagine that the grid lines on a coordinate grid are streets and that the distance between two points must be measured by the number of “blocks” a taxicab would have to travel horizontally and vertically to get from one point to the other. ...
*July 7, 2011*

**Math**

T=4 then N=86 T=5 then N=89 T=6 then N=90 T=7 then N=89 T=8 then N=86 We see that N is maximum when t=6 Answer: 6 seconds OR..... The maximum will be at the vertex of the graph. You can get the t coordinate by taking: -b/2a = -12/(2*-1) = -12/-2 = 6 The max is at 6 seconds.
*June 28, 2011*

**Math**

The amount of background noise is important to television news reporters. One station developed the formula N = -r^2 + 12t + 54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How many seconds after the speaker ...
*June 28, 2011*

**drawing**

21.A 22.B 23.B 24.A 25.D
*June 10, 2011*

**drawing**

21) The number of oil spills occurring off the Alaskan coast A) Discrete B) Continuous Find the odds. 22) When a single card is drawn from an ordinary 52-card deck, find the odds in favor of getting a red 10 or a black 6. A) 2: 25 B) 1 : 13 C) 1 : 25 D) 1 : 12 23) If the ...
*June 10, 2011*

**Math**

Consider the box-and-whisker graphs shown. They suggest that a U.S. Department of Agriculture study shows that “poultry dogs” have fewer calories per “dog” than either “beef dogs” or “meat dogs.” Yet, one dietitian claims that some hot ...
*May 20, 2011*

**PSY/315**

Is a coefficient of variation a better measure of dispersion than variance?
*May 5, 2011*

**chemistry **

Which of the following are properties of basic solutions? a.They turn the dye litmus red. b.They taste sour. c.They feel slippery. d.They react with active metals to produce hydrogen gas.
*May 4, 2011*

**Literature quick question**

Thanks for all the help!!
*April 28, 2011*

**Literature quick question**

I am doing an argumentative essay on chemtrails and I need some help on the opposing side (what's their agrument). I have 2 points so far and I need three the 2 so far are: 1. Some say that the lines are contrails 2. Some say it's condensation from the jet engines when...
*April 28, 2011*

**chemistry**

I AM NOT SURE EXACTLY WHAT I SHOULD DO
*April 17, 2011*

**chemistry**

Which molecule or compound below contains a polar covalent bond? Student Response A. NCl3 B. C2H4 C. ZnS D. AgCl E. LiI
*April 17, 2011*

**Chemistry-help needed**

Posted by candy on Monday, March 28, 2011 at 3:15pm. 0.3g of clotrimazole (C22H17ClN2) was dissolved in 80ml of anhydrous acetic acid. This was titrated with 0.1M perchloric acid using 0.3ml of naphtholbenzein as indicator until the colour changes from brownish-yellow to green...
*March 29, 2011*

**chemistry - help**

0.3g of clotrimazole (C22H17ClN2) was dissolved in 80ml of anhydrous acetic acid. This was titrated with 0.1M perchloric acid using 0.3ml of naphtholbenzein as indicator until the colour changes from brownish-yellow to green. 1ml of 0.1M perchloric acid is equivalent to 34....
*March 28, 2011*

**Chemistry-help needed**

0.3g of clotrimazole (C22H17ClN2) was dissolved in 80ml of anhydrous acetic acid. This was titrated with 0.1M perchloric acid using 0.3ml of naphtholbenzein as indicator until the colour changes from brownish-yellow to green. 1ml of 0.1M perchloric acid is equivalent to 34....
*March 9, 2011*

**Chemistry-help needed**

Can we use an ACS/AR grade chemical for UV spectrophotometric analysis? Or is it a must to use a chemical that is specially designated (SpectrAR grade) for UV analysis?
*February 21, 2011*

**business**

4. List at least three steps that make-up a workable plan and explain why each is important.
*February 21, 2011*

**Chemistry-pls help**

Can we use an AR grade chemical for UV spectrophotometric analysis? Or is it a must to use a chemical that is specially designated (SpectrAR grade) for UV analysis?
*February 17, 2011*

**Chemistry-help needed**

Can we use an AR grade chemical for UV spectrometric analysis? Or is it a must to use a chemical that is specially designated (SpectrAR grade) for UV analysis?
*February 17, 2011*

**Chemistry - help thanks**

A supplier provides "Chemical A, 98%, for synthesis". Another supplier provides "Chemical A,98%, Lab grade" Are they equivalent? Which is better for analytical use? Thanks.
*January 13, 2011*

**Chemistry-help**

How does a "chemical for synthesis" compare with the same chemical(ACS grade)when used in analytical testing? Posted by candy on Tuesday, January 11, 2011 at 2:10pm. Chemicals are supplied in different grades,e.g. ACS,AR...etc.What do we mean when we say that the ...
*January 12, 2011*

**Chemistry**

Chemicals are supplied in different grades,e.g. ACS,AR...etc.What do we mean when we say that the chemical is for synthesis?
*January 11, 2011*

**Chemistry**

We are always told to use freshly prepared potassium iodide (KI) for titrations. Why?
*January 8, 2011*

**Chemistry**

Are the following chemicals light sensitive? 1) Potassium Iodide (KI) 2) Sodium thiosulphate (Na2S2O3)
*January 8, 2011*

**geometry**

For an octahedron, V =__8__, F = __6__, and E = __12___.
*December 13, 2010*

**soc 120**

These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. Date Taken: 6/26/2011 Time Spent: 1 h , 21 min , 13 secs Points Received: 22 / 25 (88%) Question Type: # Of ...
*December 12, 2010*

**Algebra/ A.S.A.P**

thank you
*November 27, 2010*

**Algebra/ A.S.A.P**

Need help. I want to cut an extremely long problem that I just solved however I am trying to find out how -1.9 = -0.02t equals T= 93.0??? I tried dividing, multiplying and subtracting -1.9 and 0.02 together. 93.0 as the final answer was also rounded to the nearest tenth. Thank...
*November 27, 2010*

**ALGEBRA/ PLEASE HELP**

oh yes!! ur right. my mistake...thank u so much :)
*November 22, 2010*

**ALGEBRA/ PLEASE HELP**

Am I correct? Find the slope and the y intercept of y = - 10/3x - 9/2. The slope is -10/3 because this is what is in front of x and the y - intercept is (0, -9/2)? The second question is I need to find the slope of a graph that was provided for me. The y intercept is (0,6) and...
*November 22, 2010*

**ALGEBRA**

A-HA! I see now. Thank you.
*November 20, 2010*

**ALGEBRA**

I need to find a slope and y intercept of the line and write the fractional answers in lowest terms. 2y+8x+3=12+8x; I would like to try this one and get your input. 2y+8x-8x-12-3; 2y/2 = 9/2; y = 9/2 however I did not find the slope. I don't think there is one in this ...
*November 20, 2010*

**PLEASE HELP/ALGEBRA 1**

Thank you so much
*November 19, 2010*

**PLEASE HELP/ALGEBRA 1**

PLEASE HELP THANK YOU. I need to evaluate this equation with the following inputs. F(x) = 5x -12 Input: 3 and 2
*November 19, 2010*

**math**

I got it. Great! Thanks!
*November 17, 2010*

**Chemistry**

A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. A. What is the molarity of the iodine solution? B. What is the titer of the iodine solution?
*November 10, 2010*

**Chemistry**

A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. A. What is the molarity of the iodine solution? B. What is the titer of the iodine solution?
*November 10, 2010*

**English**

Which sentence is correct? 1) Check the manufacturing dates of the products. or 2) Check the manufacture dates of the products.
*October 17, 2010*

**English**

Which sentence is correct? 1) This product is due for retest. or 2) This product is due for retesting.
*October 17, 2010*

**Chemistry-pls help urgent**

Hi, if I want to prepare a w/v solution, how do I prepare it? Thanks a lot.
*October 12, 2010*

**Chemistry-pls help urgent**

this 17% ammonia is to dissolve my chloride ppt
*October 12, 2010*

**Chemistry-pls help urgent**

Posted by candy on Tuesday, October 12, 2010 at 5:04pm. 1) How do I prepare 2M nitric acid from 65% concentrated nitric acid? 2) How do I prepare 17% ammonia from 25% concentrated ammonia? Please show calculation steps. Thanks. Chemistry -pls help urgent - DrBob222, Tuesday, ...
*October 12, 2010*

**Chemistry -pls help urgent**

Assuming it is w/w as is the case for most acids and conc ammonia, can you show me the steps using 69% HNO3 and 28% ammonia? I have density of 69% HNO3 as 1.42g/ml & 28% ammonia as 0.88g/ml.
*October 12, 2010*

**Chemistry -pls help urgent**

1) How do I prepare 2M nitric acid from 65% concentrated nitric acid? 2) How do I prepare 17% ammonia from 25% concentrated ammonia? Please show calculation steps. Thanks.
*October 12, 2010*

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