Saturday

October 10, 2015
Total # Posts: 832

**Physics**

A rowboat passenger uses an oar to push the boat off the dock by exerting a force of 60.0 N for 2.0 s. What impulse acts on the boat?
*January 29, 2012*

**statistics**

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?
*January 28, 2012*

**statistics**

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?
*January 28, 2012*

**Physics**

A 44 kg child jumps off a 2.2 kg skateboard that was moving at 8.0 m/s. The skateboard comes to a stop as a result. Find the speed at which the child jumped from the board. Show all your work. Assume a frictionless, closed system.
*January 27, 2012*

**Physics**

Explain why a rapidly spinning gyroscope, mounted in a frame that allows it to rotate in any direction independently of the frame’s rotation, tends to maintain its axis pointed in the same direction in space.
*January 27, 2012*

**Physics**

A 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. Find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earth’s velocity. Earth’s mass is 6.0 × 1024 kg. Show all your ...
*January 27, 2012*

**Business **

How many years would it take for money to triple in value at 20% per year simple interest?
*January 25, 2012*

**algebra**

simplify and reduce this fraction 21m/11m+12 - 10m-12/11m+12
*January 17, 2012*

**Physics**

Summarize two observations that are contrary to the predictions based on Newton’s laws but that confirm Einstein’s explanation of gravity. Indicate how the predictions based on Newton’s theory differ from Einstein’s.
*January 11, 2012*

**Physics**

A 6.0 kg block of ice rests on a surface that is tilted by = 12°. Find the acceleration of the block ignoring any friction.
*January 11, 2012*

**Physics**

A ball is thrown horizontally from a platform so that the initial height of the ball is 6.0 m above the level ground below. The ball lands 24 m from its original horizontal location. Find how fast the ball was thrown. Show work i just don't understand
*January 11, 2012*

**Physics**

A ball is thrown horizontally from a platform so that the initial height of the ball is 6.0 m above the level ground below. The ball lands 24 m from its original horizontal location. Find how fast the ball was thrown. Show work i just don't understand
*January 11, 2012*

**Physics**

You drive your car 2 km to the gas station, 4 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20 min. What is your velocity in m/s?
*January 9, 2012*

**Physics**

Cheryl runs a race on a 400.0 m circular track. She starts running east of the starting line and then circles the track and falls, stopping 1.00 m west of the starting line. Her time is 80.0 s. What was her average velocity? I know the correct answer is -1.25 x 10-2 m/s. But ...
*January 9, 2012*

**Physics**

A car travels 10.0 m/s. What is its velocity in km/h?
*January 8, 2012*

**Physics**

A 70.50 kg man rides a Ferris wheel with a radius of 10.3 m at a velocity of 5.00 m/s. What is the centripetal force that she experiences expressed with the correct number of significant figures?
*January 8, 2012*

**ALGEBRA**

Why are there two possible answers to an absolute value equation?
*November 28, 2011*

**Physics**

A 12 kg barrel is pulled up by a rope. The barrel accelerates at 1.2 m/s2. Find the force exerted by the rope. Show all your work.
*November 21, 2011*

**math**

subtract and simplify 3/4 minus 5/8
*November 15, 2011*

**business communication**

if i had to guess i would choose a.
*November 7, 2011*

**business communication**

Which of the following is not a good guideline to follow when writing to international audiences? a. write in the reader's language if you have any knowledge of the language at all; doing so greatly increases goodwill, even if you make mistakes. b. Be aware that the reader...
*November 7, 2011*

**business communication**

im choosing between b or c. costs are generally mentioned near the end of the body and are connected to specific benefits. c. shows generally, the price is not mentioned until the last fourth of the message, after the content makes the audience want the product. according to ...
*November 6, 2011*

**business communication**

The exact price of the product should be mentioned: a. early in the letter, as soon as the offer is first mentioned. b. in the middle of the letter, as soon as benefits are first mentioned. c. in the last fourth of the letter, after the copy makes the reader really want the ...
*November 6, 2011*

**business communication**

i agree with you ms. sue
*November 5, 2011*

**business communication**

im guessing it has to be c.
*November 5, 2011*

**business communication**

i know its not a my text states that a series of questions can be an effective opener. i know b is wrong is well because startling statements can be used to capture a readers attention so im leaning on choice c or d.
*November 5, 2011*

**business communication**

effective openers to a sales letter may include all of the following except: a. a series of questions that intrigues the reader and gets her thinking. b. a starting statement that captures the reader's attention. c. a direct suggestion that the reader purchase a new and ...
*November 5, 2011*

**Physics**

A bicyclist is coasting down a road that is sloped downward at an angle of 8°. The bicycle and bicyclist have a total mass of 80 kg. If the bicycle wheels roll freely, without any effect from friction or air resistance slowing the motion, how fast would the bicyclist ...
*November 3, 2011*

**Algebra**

Is the square root of 362-a real number, irrational number, rational number, integer, whole number and or counting number?
*October 23, 2011*

**Physics 3**

9x^2y-7,3x^3
*October 20, 2011*

**physics **

A 23- bullet traveling 230 penetrates a 3.6 block of wood and emerges cleanly at 170 . If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?
*October 14, 2011*

**math**

Urn I and urn II each have two red chips and two white chips. Two chips are drawn simultaneously form each urn. Let X1 be the number of red chips in the first sample and X2 the number of red chips in the second sample. Find the pdf of X1+X2.
*October 9, 2011*

**physics**

A man walks 15m north then 20m at 32° E of N and then 11 m at at 15° S of W determine his net displacement
*September 28, 2011*

**physics**

A man walks 15m north then 20m at 32° E of N and then 11 m at at 15° S of W determine his net displacement
*September 28, 2011*

**ALGEBRA2**

HAS THE CONTENT in this course allowed you to think of math as a useful tool? if so how? what concepts investigated in this course can apply to your personal and professional life? in what ways did you use my mathlab for extra support?
*September 25, 2011*

**English**

to settle an argument.. is it correct to hyphenate She will be placed into a short-leg walking cast? I say yes! Thank you !
*September 22, 2011*

**English**

Similarly, on the left ear, the eardrum, itself, did not appear infected and we simply talked about watching the number of infections that pop up this winter, as well as our potential need to replace tubes, if the infections become too bothersome or frequent. I cannot change ...
*September 21, 2011*

**English**

I have asked her family to let me discuss this with our cochlear implant team to see if this would be a reasonable option from their perspective. Is cochlear implant team capitalized?
*September 21, 2011*

**English**

She does need preferential seating in the front of her classes, which she is not getting in history currently. Is "history" capitalized in this sentence.
*September 21, 2011*

**Geometry**

Referring to the figure below (not to scale), the perimeter of the rectangle is 48. The length of the rectangle is W + 6, where W is the width. Find the length.
*September 14, 2011*

**science**

talking on your cell pohon e in your beddroom, when suddenly the reception goes bad for a minute
*September 13, 2011*

**physics**

displacement for walking 100m east than 125m west
*September 3, 2011*

**Accounting**

March 3 Inventory units 60 per unit $1,500 total $90,000 March 8 Purchase 120 units $1,800 per unit total $216,000 March 11 Sal units 80 per units $5,000 total $400,000
*August 28, 2011*

**trig**

If a, b are the solutions of the equation log base 3 (5-2x)+ log base 3 (5+2x)=2 find the value of the product ab.
*August 26, 2011*

**trig**

find the value of x when: x= 5 log base 2 (1/16)+ 8 log base 3 (27)
*August 26, 2011*

**Oceanography**

How much heat must be added to turn 3 grams of water at 100°C into a vapor and what will be the final temperature after this much heat is added
*July 7, 2011*

**physics**

A child is pushing a shopping cart at a speed of 1.5 m/s. How long will it take this child to push the cart down an aisle with a length of 9.3 m?
*June 29, 2011*

**science**

How is potiential evaporation measured?
*June 27, 2011*

**physical science**

A rocket blasts off. In 10.0 seconds it is at 10,000 ft, traveling at 3600 mph. Assuming the direction is up, calculate the acceleration. 5280 ft/sec2 528 ft/sec2 100 ft/sec2 100. ft/sec2
*June 27, 2011*

**physical science**

A rock tied to a string is swung around in a circle at a constant speed of 25 ft/sec. The length of the string is 1.765 ft. Calculate the acceleration. = _____ . 354.1 ft/sec2 350 ft/sec2 14.16 ft/sec2 14 ft/sec2
*June 27, 2011*

**physical science**

A weight attached to a wire is swung in a circular path. Its speed is 12 meters/sec, and it has a centripetal acceleration of 9.0 meters/sec2. Calculate the diameter of the circle. 1.3 meters 2.6 meters 16 meters 32 meters
*June 27, 2011*

**physical science**

While traveling south on an expressway, a car traveling 60 mph (miles per hour) slows down to 30 mph in 12 minutes due to traffic conditions. Calculate the acceleration. = -2.5-6.0-150-450 mi./hr2 NSWEn/a
*June 27, 2011*

**physical science**

If a car goes along a straight road heading east and speeds up from 45 ft/sec to 60. ft/sec in 5 sec, calculate the acceleration. = Note: If the speed were given in miles per hour, and the time were given in minutes, you could change the minutes to a fraction of an hour and do...
*June 27, 2011*

**physical science**

If a car goes along a straight road heading east and speeds up from 45 ft/sec to 60. ft/sec in 5 sec, calculate the acceleration. = 3-3 ft/sec 2 NESn/aW Note: If the speed were given in miles per hour, and the time were given in minutes, you could change the minutes to a ...
*June 27, 2011*

**physical science**

A rock tied to a string is swung around in a circle with a radius of 10 ft. The centripetal acceleration is 16.9 ft/sec2. Calculate the speed of the rock.
*June 27, 2011*

**physical science**

A car slams on its brakes, coming to a complete stop in 4.0 sec. The car was traveling north at 60.0 mph. Calculate the acceleration.
*June 27, 2011*

**physical science**

A car goes around a curve (the arc is part of a circle with a radius of 25 ft.) with a speed of 20.0 ft/sec. What is the magnitude of acceleration?
*June 27, 2011*

**physic**

How do you find the average speed?
*June 23, 2011*

**Physics**

Calculate the work done by non conservative forces of a hockey stick hitting a tennis ball using elastic potential energy, and kinetic energy if the mass of the ball is 0.058kg and the ball is shot at 34m/s for .41s and travels 5.09m, and the hockey stick bends 0.10m.
*June 13, 2011*

**Ethics **

I am so tired of seemingly educated students not knowing how to form complete sentences or spell. If you really want to make an impression, or even get anyone to read the posts, take the time to act like someone who's opinion is something we want to consider. In other ...
*June 10, 2011*

**Geometry**

Thanks
*June 6, 2011*

**Geometry**

A 4-in. by 6-in. drawing is enlarged to put on a poster that measures 20 in. by 24 in. What are the dimensions of the largest possible enlargement?
*June 6, 2011*

**world geography **

007690RR, 007691, 007692, 007693 pls help me. penn foster exam for world geography.
*June 5, 2011*

**world issuse**

Passage
*May 24, 2011*

**Alkaline Dry Cell**

I need to be able to label all parts of battery
*May 22, 2011*

**trig**

In triangle XYZ, angle X = 90°, angle Y = 38°, and z = 4'5". Find y
*May 20, 2011*

**chem**

You have a series of four chemical reactions (1 2 3 4). How do you calculate the H2 if you know the other H values?
*May 17, 2011*

**chem**

Two hundred grams of a substance requires 0.52 kJ of heat to raise its temperature from 25°C to 45°C. q = mCT. Mass (m) is in grams. Temperature is in degrees Celsius.
*May 17, 2011*

**Chem**

What is the change in enthalpy when 250 g of steam condenses at 100oC? (Hv = 40.67 kJ/mol)
*May 17, 2011*

**chemistry**

calculate the mass, in grams, of NaCl present in each of the following solutions. 6.25 g of 11.5% NaCl solution 452 g of 12.3% NaCl solution please show me how to do these. Thanks.
*April 29, 2011*

**chemistry**

how does an ionic solute dissolve in water?
*April 27, 2011*

**chemistry**

It was that easy. I think I was trying to make it harder than it was. Thanks for the help
*April 17, 2011*

**chemistry**

A hexane solution contains as impurities 5.2% (by mass) hepatne and 2.9% (by mass) pentane. Calculate the mass of each component present in 93g of the solution.
*April 17, 2011*

**world history**

How total was the transformation brought about by the industrial revolution?
*April 17, 2011*

**math**

assume that the edge of a square is 1 unit add squares to this shape so that it has a perimeter of 18
*April 6, 2011*

**geometry**

Find the area of a pentagon ABCDE with verticles A(0,4),B(3,2),C(3,-1), D(-3,-1) and E (-3,2)
*April 6, 2011*

**geometry**

Find the area of a pentagon ABCDE with verticles A(0,4),B(3,2),C(3,-1), D(-3,-1) and E (-3,2)
*April 6, 2011*

**Chemistry**

what role does barometric pressure play in the boiling point of water?
*April 3, 2011*

**stressed and unstressed syllables**

how do you know a stressed or unstressed syllable
*March 28, 2011*

**math**

For the set X={m,n.p,q,r,s}, let R be the relation on P(X) (power set) given by A R B iff A and B have the same number of elements. List all the elements in {m}/R (equivalence class); in {m,n,p,q,r,s}/R. How many elements are in X/R? How many elements are in P(X)/R?
*March 27, 2011*

**math**

define the concept of sampling error
*March 27, 2011*

**health**

What would be the risk od a young healthy person choosing a managed care plan,
*March 25, 2011*

**Chemistry**

N2O4(g) 2 NO2(g) The ΔH° for the reaction above is +57.2 kJ. The system is initially at equilibrium. Which of the following changes will favor the reverse reaction? NO2 is removed. N2O4 is removed. A catalyst is added. The temperature is increased. The temperature is ...
*March 12, 2011*

**5th grade math**

I need help with this problem ! 5 2/5 - 3 4/5= ? 6 1/10 - 3 4/10 = 10 - 4 2/5= ? PLEASE! SHOW ME EACH PROBLEM STEP BY STEP SO , I CAN FINISH MY HOMEWORK! THANK YOU!
*March 3, 2011*

**math**

Use the Generalized PMI to prove: 2^n > n^2, for all n > 4 First of all, it's true for n=5. Then to prove it for n+1... Assume 2^n > n^2. Then 2^(n+1) = 2*2^n > 2*n^2 > 2*(4n) since n>4 => n^2>4n I'm stuck there.
*March 3, 2011*

**math 4th grade**

each student brought in 9 cans to recycle. write an equation to represent the total number of cans (c)for any number of students(s)
*February 24, 2011*

**society**

two ways American institutions have brought oppressed groups closer to the American dream
*February 23, 2011*

**english 101**

how do you plan to support this thesis on healthy eating
*February 21, 2011*

**education**

how do you implement your educational philosophy in the classroom and what educational theories would be at work.
*February 20, 2011*

**math**

Prove that if x ∉ B and A ⊆ B, then x ∉ A.
*February 19, 2011*

**algebra**

factor 1 36x^12 40x^8
*February 17, 2011*

**algebra**

multiply and simplify 5a^7. 6q^5 4q^2 25a
*February 17, 2011*

**english 101**

Identify the topic and three subtopics for healthy eating
*February 14, 2011*

**english 101**

i need help on healthy eating what 3 credible sources from the internet
*February 14, 2011*

**Immediate accounting**

make a journal entry received cash for 1600 frome customer for rent from dec 2009 thru mar 2010 I have more room than I need so i rented out the area
*February 12, 2011*

**5th grade math**

Which answer shows data with a range of 49? A. 45,69,92,59 B. 95,59,52,89 C.99,66,51,52 D.55,99,78,50 if you select one of the answer .How do you solve the problem.? i was wonder how ?please explain your answer please!! so the next problem i try to solve by myself.for me thank...
*February 9, 2011*

**5th grade math**

In 2000 the population of goddard was 5,554. The population of Valley Center was 7,323. What is the Approximate difference between the populations, to the nearest one hundred people. please! help I'm totaly confuse with this question?? do you substract it?
*February 9, 2011*

**Chemistry**

Which of the following can be amphoteric? A) Cl¯ B) H3O+ C) HPO4¯ D) PO4¯³ E) HCl
*February 8, 2011*

**college algebra**

GCF -x^7,-7x^3,-35x^6
*February 5, 2011*

**college algebra**

factor by grouping 6x^3-6x^2-x+1
*February 5, 2011*