OLGA
Most popular questions and responses by OLGA
physics
You’re sanding a table. You must exert a force of 23 N on the sandpaper to keep it moving steadily across the table’s surface. You slide the paper back and forth for 23 minutes, during which time you move it 1090 m. How much work have you done?
asked on February 10, 2011 
physics
If you were to separate all of the electrons and protons in 1 g (0.001 kg) of matter, you’d have about 96,000 C of positive charge and the same amount of negative charge. If you placed these charges 5 m apart, how strong would the attractive forces
asked on May 5, 2011 
physics
The builders of the pyramids used a long ramp to lift 20000kg (20ton) blocks. What is the gravitational potential energy of one of the blocks if it’s now 79 m above the ground?
asked on February 10, 2011 
physics
Some special vehicles have spinning disks (flywheels) to store energy while they roll downhill. They use that stored energy to lift themselves uphill later on. Their flywheels have relatively small rotational masses but spin at enormous angular speeds. How
asked on February 21, 2011 
physics
Your new designer chair has an Sshaped tubular metal frame that behaves just like a spring. When your friend, who weighs 580 N, sits on the chair, it bends downward 5 cm. What is the spring constant for this chair?
asked on March 10, 2011 
physics
As you walked on the moon, the earth’s gravity would still pull on you weakly and you would still have an earth weight. How large would that earth weight be, compared to your earth weight on the earth’s surface? (Note: The earth’s radius is 6378 km
asked on March 31, 2011 
math
lyle needs 200g of chocolate that is 86% cocoa for a cake recipe he has one kind that is 99% cocoa and another kind that is 70% cocoa. How much of each kind does he need to make the cake
asked on February 17, 2011 
bussness math
Christina Fox took out a simple interest loan at 5% for 12 months. Her previous balance is $200. What is the interest for the next payment?
asked on November 6, 2015 
chemistry
A 25g sample of a compound composed of Carbon, Hydrogen, and Oxygen was combusted. 55grams of Carbon Dioxide and 30 grams of water were collected. A) What is the empirical formula of the compound? B) If the compound has a molar mass of 120g what is the
asked on October 8, 2010 
physics
If an 75kg baseball pitcher wearing frictionless roller skates picks up a 0.145kg baseball and pitches it toward the south at 40 m/s, how fast will he begin moving toward the north?
asked on March 31, 2011 
Accounting
A company that uses the perpetual inventory system purchased $8,500 on September 25. Terms of the purchase were 2/10, n/30. The invoice was paid in full October 4. Prepare the journal entries to record these merchandise transactions.
asked on March 27, 2019 
chem
Nitrogen and hydrogen gases are combined at high temperatures and pressures to produce ammonia, NH3. If 104.6 g of N2 are reacted with excess H2, how many moles of NH3 will be formed?
asked on May 16, 2011 
physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 120 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to
asked on March 15, 2011 
physics
If a burning log is a black object with a surface area of 0.35 m2 and a temperature of 800 ¢ªC, how much power does it emit as thermal radiation?
asked on April 21, 2011 
physics
The earth exerts a downward force of 850 N on a veteran astronaut as he works outside the space shuttle. What force (if any) does the astronaut exert on the earth?
asked on February 10, 2011 
Physics
The builders of the pyramids used a long ramp to lift 21000kg (21ton) blocks. If a block rose 0.86 m in height while traveling 20 m along the ramp’s surface, how much uphill force was needed to push it up the ramp at constant velocity?
asked on February 14, 2011 
physics
When you put water in a kitchen blender, it begins to travel in a 7cmradius circle at a speed of 1 m/s. How quickly is the water accelerating?
asked on March 15, 2011 
Calculus
The measurement of the side of a square is found to be 12 cm with a possible error of 0.05 cm. Use differentials to estimate the propagated error ΔA in computing the area of the square. Please do not include the ± symbol in your answer. Round your final
asked on October 17, 2015 
Math
In one hour, Ed used 2/5 of time to complete his homework and 1/4 of the time to check his email. How much time did he spend completing homework and checking email? Write answer as a fraction
asked on February 9, 2017 
physics
Your car is broken, so you’re pushing it. If your car has a mass of 868 kg, how much momentum does it have when it’s moving forward at 4.74 m/s (17.1 km/h)?
asked on March 3, 2011 
physics
You remove two socks from a hot dryer and find that they repel with forces of 0.003 N when they’re 4 cm apart. If they have equal charges, how much charge does each sock have?
asked on May 5, 2011 
physics
A sprinter can reach a speed of 12 m/s in 0.96 s. If the sprinter’s acceleration is constant during that time, what is the sprinter’s acceleration?
asked on February 9, 2011 
9th grade
Write an algebraic expression for the phrase. the sum of b and 11 a. b/11 b. b + 11 c. 11b d. b – 11
asked on September 9, 2010 
physics
You’re using a wedge to split a log. You are hitting the wedge with a large hammer to drive it into the log. It takes a force of 3500 N to push the wedge into the wood. If the wedge moves 0.2 m into the log, how much work have you done on the wedge?
asked on February 10, 2011 
CHEM
what is the charge of a PHOSPITE ? and how do i write it?
asked on September 26, 2010 
physics
If you and a friend 10 m away each have masses of 84 kg, how much gravitational force are you exerting on your friend?
asked on March 31, 2011 
Chemistry
Some solid copper(II) sulfate is dissolved in sufficient water to make 100.0 mL of solution. Enough of a sodium hydroxide solution of concentration 0.1500 mol/L is added just to react with all of the first solution, with none left over. This turns out to
asked on February 22, 2011 
Algebra
A truck driver traveled at an average speed of 58 miles per hour on a 200mile trip to pick up a load of freight. On the return trip (with the truck fully loaded), the average speed was 37 miles per hour. Find the average speed for the round trip.
asked on January 19, 2013 
physics
A dish of hot food has an emissivity of 0.42 and emits 15 W of thermal radiation. If you wrap it in aluminum foil, which has an emissivity of 0.06, how much power will it radiate?
asked on April 19, 2011 
physics
If you sit in a good swivel chair with your feet off the floor, the chair will turn slightly as you move about but will immediately stop moving when you do. Why can’t you make the chair spin without touching something?
asked on March 3, 2011 
9gr
Is it not at all feasible to you that this guy is a genuinely good person? Which of these words is an antonym of feasible? a. understandable b. unclear c. likely d. impossible
asked on September 12, 2010 
health
Paula Patient doesn't want her violent boyfriend to know she's getting an abortion, so she asks Dr. Bob to send all communications to her to a post office box and to phone her only at work. What should Dr. Bob do, and what is the legal basis for your
asked on April 26, 2009 
Calculus
Determine the linear approximation of 21/2. Express your answer as a reduced fraction in the form a/b.
asked on October 17, 2015 
Chemistry
A1.367g sample of an unknown organic compound is combusted with oxygen to give only 1.459 g H2o and 3.055 g of Co2. What is the empirical formula of the compound?
asked on October 19, 2011 
penn foster
which suffix means pertaining to conditions present at birth
asked on March 22, 2011 
ss
what is the significance of a tributary?
asked on April 7, 2010 
Calculus
The function defined below satisfies Rolle's Theorem on the given interval. Find the value of c in the interval (3, 2) where f'(c)=0. f(x) = x + 6x1 , [3, 2] Round your answer to two decimal places.
asked on October 17, 2015 
Calculus
Which of the following is the linear approximation formula, L(x), that estimates values of y = ln(x) + 1 for values of x near 1? a) y = x  1 b)y = x c)y = x + 1 d)y = x
asked on October 17, 2015 
Chemistry
What amount of heat is required to raise the temperature of 10.0 g of aluminum by 15.0 C
asked on February 8, 2012 
Chemistry
What amount of heat is required to raise the temperature of 10.0 g of aluminum by 15.0 C
asked on February 8, 2012 
chemistry
suppose you know the values for r, theta, and phi which specify a point. what are the corresponding values of x,y,z? Write an expression for x as a function or r, theta,and phi; then do the same for x,y,z. Using the answer to the previous question write
asked on March 31, 2011 
statistics
For a sample with a mean of M 45, a score of 59 corresponds to z 2.00. What is the sample standard deviation?
asked on March 7, 2011 
Chemistry
Can someone explain to me in simple terms what is relative mass and absolute mass? And how to calculate them too. Thanks.
asked on March 4, 2011 
physics
When your car is moving at 3.33 m/s and car has a mass of 860 kg, how much translational kinetic energy does it have?
asked on February 21, 2011 
physics
If your car accelerates from rest at a steady rate of 4 m/s2, how soon will it reach 81 km/h (50.3 mph or 22.5 m/s)?
asked on February 9, 2011 
physics
If your car has a mass of 770 kg, how much force is required to accelerate it forward at 4.98 m/s2?
asked on February 2, 2011 
9gr
What is the distance between the points (5, 10) and (4, 2) in the xyplane? 12 9 15 10
asked on September 9, 2010 
calculus
Evaluate the integral. from 1 to 5 (ln(x))^2/x^3 dx.
asked on March 26, 2017 
math
3(x+4)5= n is 9
asked on February 13, 2017 
Calculus
The function defined below satisfies Rolle's Theorem on the given interval. Find the value of c in the interval (0,1) where f'(c)=0. f(x) = x3  2x2 + x, [0, 1] Round your answer to two decimal places.
asked on October 17, 2015 
Calculus
The function defined below satisfies the Mean Value Theorem on the given interval. Find the value of c in the interval (1, 2) where f'(c)=(f(b)  f(a))/(b  a). f(x) = 1.5x1 + 1.1 , [1, 2] Round your answer to two decimal places.
asked on October 17, 2015 
physics
An object traveling 339 m/s strikes a 2nd object and comes to rest 24 cm inside of the 2nd object (which does not move). What is the 1st object's average deceleration (m/s/s)?
asked on September 6, 2015 
Language art
Are the words " knowledgable and "daring" nouns in the sentence " readers admire his knowledge and daring I think readers are nouns but why would knowledge and daring be nouns.
asked on September 16, 2014 
game theory
What is the relationship between the maximin payoﬀ and the set of NE payoﬀs in a ﬁnite game?
asked on October 22, 2012 
chemistry
spherical coordinates if n=2,l=1,ml=x, add up all the probabiliity densities.
asked on March 31, 2011 
physics
A tricycle releases 60 J of gravitational potential energy while rolling 0.59 m directly downhill along a ramp. What is the downhill force (if constant) acting on the tricycle?
asked on March 3, 2011 
science
Is it not at all feasible to you that this guy is a genuinely good person? Which of these words is an antonym of feasible? a. understandable b. unclear c. likely d. impossible
asked on September 12, 2010 
9gr
3.What is the next term in the sequence below? 8, 27, 64, 125, ... 216 343 18 10
asked on September 9, 2010 
9th grade
Write an algebraic expression for the phrase. 4 times the sum of q and p a. 4 + q + p b. 4qp c. 4q + p d. 4(q + p) MY ANSWER D.?????
asked on September 9, 2010 
social studies/canada
According to the United Nations,Canada is a great place to live. How do both natural resources and government policies combine to make this true?
asked on March 21, 2010 
English
What is the subject? One of the major celebrations during the Chinese New Year is the New Year's reunion dinner.
asked on January 22, 2010

Math
A company that uses the perpetual inventory system purchased $8,500 on September 25. Terms of the purchase were 2/10, n/30. The invoice was paid in full October 4. Prepare the journal entries to record these merchandise transactions.
posted on March 27, 2019 
Math
(10,12)
posted on May 2, 2018 
English
d?
posted on October 17, 2017 
4th Grade Math
Emma says the product of a 3 digit number and a 1 digit number will be either a 3 digit number or a 4 digit number
posted on October 28, 2016 
Health
I think is D
posted on June 30, 2016 
life orientation
By m aking project.by teaching people.making a sort of media talking about human rights.
posted on May 1, 2016 
life orientation
I need your help please
posted on April 27, 2016 
Physics
r=100 perimeter 2pi r = 2x3.14x100 = 628 m 4.5 times a) 4.5 x 628 = 2826 b) 628/2 = 314
posted on October 17, 2015 
physics
600/9.8 = 61.2 kg
posted on September 27, 2015 
math
Ten
posted on August 31, 2015 
math
24!!!
posted on December 4, 2013 
Math/Statistics
A
posted on June 9, 2013 
penn foster
ical,iac,ic,ial
posted on March 22, 2011 
math
74
posted on February 26, 2011 
physics
29.2m/s= t*.40m/s^2+0 t=29.2m/s/.40m/s^2 t=73s
posted on February 9, 2011 
CHEM
okay then, what is calcium phospite?
posted on September 26, 2010 
9th grade
Thanks
posted on September 9, 2010 
9th grade
B+11
posted on September 9, 2010 
10th grade
Why?
posted on September 9, 2010 
Legal Aspects of Health Info
The answers are in the book.
posted on April 7, 2009 
health information
The answer is in your book. Read it a gain.
posted on March 22, 2009 
health information
The answer is in your book. Read it again.
posted on March 22, 2009 
confudentiality health information
The answer is in your books. Read them again.
posted on March 22, 2009 
Health Research Project
I finished this project and got a "B" on it. All the information you need is at the AMA site and in your book. Good luck.
posted on March 22, 2009 
Reseach paper
I too am working on this research project and found what was needed at the AMA site. Now I just have to write the eight paragraphs. Good luck.
posted on January 24, 2009 
Law and Ethics
I too am working on this research project, and found the information regarding ethical opinions at the AMA site. Now all I have to do is write the 8 paragraphs.
posted on January 24, 2009 
Chemistry
.0042
posted on September 8, 2008