Wednesday
December 7, 2016

Posts by Mary

Total # Posts: 3,755

Math
The rating for a tv show dropped a total of 10 points in 2 weeks. What integer represents the average change in points per week?
December 5, 2016

Physics
ou build a loop-the-loop in your backyard. It has a diameter of 3.10 m. a) How fast will you have to be moving at the top of the loop to avoid falling off? b)If you'll be coasting from the time you get to the bottom of the loop, how fast will you have to be going at the ...
December 5, 2016

Physics
A 15 kg box is given an initial push to start it moving up a frictionless ramp with angle theta = 30 degree and length delta r = 22m. What horizontal force F will keep the box moving with constant speed to the top of the ramp?
December 4, 2016

Physics
Material X has a coefficient of linear expansion a = 0.00000271/degree C. What value would you expect its volume coefficient of expansion to be
December 3, 2016

physics
Suppose Captain Marvel leaps from the top of a 20 m tall building. If his initial speed is 12 m/s, then what is his speed just before he lands on the ground?
November 30, 2016

maths
if a room is 5500 sq metres the romm lenth is 6 times the width what is the length of the room
November 29, 2016

Physics
An aluminum (with Young's modulus 7 x 10^10 Pa) rail is 88.0 m long and has cross-sectional area 0.00050 m^2. The rail is fixed at one end and a 4000 N force is applied at the other end. By how much does the bar stretch?
November 27, 2016

AP Calculus
I am doing the 100 meter men's freestyle swimming lab (in case you know what I am referring to) and I need to fibd the lower limit analytically. I am given a table of data containing the years after 1900 and the time in second of each country , for example: Time. Country. ...
November 26, 2016

math
A(x)=x^2+6x^2 A(x)= 7x^2
November 26, 2016

Physics
A satellite orbits the Earth in an orbits 750 km high. Find (*) the satellite's orbital speed and (**) period. (The mass and radius of the Earth are 5.98E + 24 kg and 6370000 m, respectively.)
November 26, 2016

English comp 1
Revise the following paragraph, improving it without changing its overall meaning. Pay particular attention to any potential sentence fragments.     I love Impressionist art. When I was a child, I went to the museum. The art museum. I stood in front of Monet'...
November 22, 2016

science
Thanks , that's exactlywhat I thought, but did something wrong when solving and thought I was wrong . THANKS!!
November 21, 2016

science
If a penny prior to 1982 weighted 3.1 grams and a current one weighs 2.5 grams how many pennies weighing 3.1 and 2.5 will I need in a combination of ten in total to have 25 grams??
November 21, 2016

Physics
An angle of a circle with a 2 m radius is delta theta = 20 degree. What is the corresponding arc length delta s?
November 20, 2016

Physics
A wheel is rotating with angular velocity 14 rev/s. What angular acceleration would be needed to bring the wheel to rest in a single rotation?
November 20, 2016

math
78, 69, 45, 89, 74, 37, 99, 77, 100, 82. What is the interquartile range of these scores?
November 19, 2016

Math
Test 62,004 for divisibility by 2, 3, 5, 9, or 10. Please help!!
November 9, 2016

Math
How do you write 1,840 in scientific notation?
November 9, 2016

Math
Write the expression using an exponent. 4^2 - (2 • 2^4) a -16 b 30 c -240 d 224 (-3)^3 a 0 b -9 c -27 d 27 37 • 5^2 - 9 • 4^2 a 9,472 b 781 c 256 d 2,816
November 9, 2016

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2
November 8, 2016

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2
November 8, 2016

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2
November 8, 2016

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2
November 8, 2016

Chemistry
What mass of hydrogen gas is produced when 3.0 mol of iron react with excess hydrochloric acid according to the reaction below 2Fe + 6HCl --> 2FeCl3 + 3H2
November 8, 2016

physics
A can of Coke moving 15.6 m/s toward the right(the positive direction) collides with a can of Pepsi moving 3.21 m/s toward the left, and both cans are badly crunched. If the final velocity of the can of Coke is 2.48 m/s still toward the right, then what is the final velocity ...
November 1, 2016

SS
how did Alexander Hamilton plan to pay off the national debt? by creating a population tax by printing new currency by taxing imports** by increasing exports
November 1, 2016

Statistics
Please help me with this homework you roll two fair dice, a green one and a red one? (a) are the outcomes on the dice independent? (b)Find P(1 on green die and 2 on red die) (c)Find P(2 on green die and 1 on red die) (d)Find P(1 on green die and 2 on red die) or (2 on green ...
October 30, 2016

physics
The answer is #4. I had that same question and got it right.
October 25, 2016

Physics
Several forces are applied to an object. If the object 40 m along the horizontal, and if one of the forces is a constant 5.0 N in the opposite direction, then what is the worst done on the object by that force?
October 25, 2016

Ela
Can you help me with the final check:Relating to Parents chapter 17
October 25, 2016

calc
How do I find the inverse of a picewise function???
October 24, 2016

Math
The diameters of a circle is 50cm how far does the wheel travel for 1 turn
October 24, 2016

Physics
You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.3 m above the ground, and it is moving at a speed of 7.4 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...
October 23, 2016

Statistics
Write an inequality that represents all of the data values X, that fall between the values of the mean +/- the standard deviation
October 21, 2016

college algerbra
Describe how you know if an inequality is an “and” or an “or” problem. (use -3 < x+5 < 8).
October 21, 2016

pre-calc
e^-1 cost +sint(-e^-t)=0
October 20, 2016

pre-calc
Solve for t if 0<t<2pi Note: both are less than or equal to . Please help!! I am not sure what I should do.
October 20, 2016

physics
Two objects are positioned and moving . m 1 = 7 kg ,m 2 =11 kg, and the coefficient of kinetic friction between object 1 and the tabletop is uk = 0.14. Find the acceleration of object 2(assuming up is the positive direction) as well as the tension in the string.
October 18, 2016

Chemistry
These were all correct 100%
October 18, 2016

Chemistry
What do you mean "ok"? Are they correct?
October 18, 2016

Chemistry
1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation? A) A positive charge...
October 18, 2016

Math
How many square tiles with sides 1 foot long would be needed to cover the floor of an 8' x 10' room
October 17, 2016

Engineering
Would someone please help me to set this problem up. Thanks
October 17, 2016

Engineering
If the cost of a .75 x 6.o x 19.0 sheet of ABS plastic is $18.00, what is the cost to make 20 parts? each part has a mass of .437lb.
October 17, 2016

Engineering
.437 lbs
October 17, 2016

Engineering
Damon the mass is .437 per part. It should be a simple problem for me but I am not sure right now. Thanks for your help.
October 17, 2016

Engineering
If the cost of a .75 x 6.0 x 19.0 sheet of ABS plastic is $18.00, what is the cost to make 20 parts?
October 17, 2016

Chemistry
1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation? A) A positive charge...
October 17, 2016

Science/Math
You put 50 mL of water in a graduated cylinder, then you place an object in the water. The level rises to 55 mL. What is the volume of the object?
October 16, 2016

Physics
A projectile is launched horizontally from a cliff and has initial speed 30 m/s. The projectile will hit the ground 10 s later. What is the horizontal component of the projectile's velocity 5.0 s after launch. Assume air resistance is negligible.
October 14, 2016

Physics
A man chased by the army, leaps with speed 12 m/s at a 47 degree angle above the horizontal from the top of a building. If he lands 40.0 m from the base of the building, then finds the height of the building
October 13, 2016

math
Before 1986, a gold bullion in the Federal Reserve Bank was rectangular and had a volume of approximately 727.7 cm3. The density of gold is 19.3 g/cm3. A pound is approximately 454 g. Find the weight of one gold bullion to the nearest tenth of a pound
October 11, 2016

Chemistry
#3 was wrong.
October 10, 2016

Chemistry
1) The letter "p" in the symbol 4p^3 indicates the ___. A) spin of an electron B) orbital shape*** C) principal energy level D) speed of an electron 2) If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that orbital? A) ...
October 10, 2016

French
I have a Windows PC and thank you!
October 10, 2016

French
Thank you
October 10, 2016

French
Check answers? 1) Write a comparative sentence: La tortue est intelligente mais le poisson est tres intelligent. A) La tortue est moins intelligente que le poisson.*** B) La tortue est aussi intelligente que le poisson. C) La tortue est plus intelligente que le poisson. 2) ...
October 10, 2016

Math
Byong Sun withdraws $15 from his bank account once each day for four days. what integer represents the change in the amount in the account? find the integer that would represent the change in the amount in the account if Byong Su deposits $15 into his bank account once each ...
October 9, 2016

American Government
Check answers? 1) What is the main difference between the formal and informal qualifications for the House of Representatives? A) Formal qualifications are outlined in the Constitution**** B) Formal qualifications do not have to be followed C) Informal qualifications deal with...
October 7, 2016

Precalculus
For this problem, we will use the formula for position of an object. y=1/2at^2+vot+ho, where t is time in seconds, a is acceleration in meters per second squared (in this case gravity so -9.8 m/s2), v0 is the initial velocity in meters per second, and h0 is the initial height ...
October 7, 2016

Geometry
1) What are the converse, inverse, and contrapositive of the statement? Which statements are true? If the figure is a rectangle with sides 2 cm and 3 cm, then it has a perimeter of 10cm. My A: the statement is not true. 2) What are the hypothesis and the conclusion of the ...
October 7, 2016

MS. SUE HELP- Chemistry
Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...
October 7, 2016

Chemistry
Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...
October 7, 2016

Physics
A cute puppy walks 20 m at 30 degrees north of east and then continues another 45 m at 15 degrees south of east. Find the magnitude of the puppy's net displacement (or the distance from the starting point)
October 6, 2016

physics
If a vector K has component Kx = 4.1 and Ky = -13, then find the magnitude K and direction (as a positive rotation angle relative to the +x axis) of the vector.
October 6, 2016

Math
How many complete sets of aprons could you make out of 5 1/2 bolts of material and 1 bolt is equal to 15 yards? there are adult size which needs 3/4 yard material to make and child size which takes 1/2 yard to make.
October 5, 2016

Physics
A net force is applied to an object, the same net force is then applied to a second object with 6.2 times the mass of the first then the acceleration of the second object will be how many times the acceleration of the first object?
September 30, 2016

Physics
If a 350 kg object is moving with constant velocity 22 m/s due east then what is the magnitude of the net force acting on the object?
September 30, 2016

Physics
A taxicab moves 5 blocks due north, 5 blocks due east, and another 2 blocks due north. Assume all blocks are of equal size. What is the magnitude of the taxi's displacement?
September 27, 2016

Physics
A science student is riding on a flatcar of a train along a strait, horizontal track at a constant speed of 12.0 m/s. The student throws a ball into the air along a path he judges to make an initial angle 65. deg with the horizontal and to be in line with the track. The ...
September 25, 2016

HCC
A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 19.5 m/s , and the distance between them is 57.0 m . After t1 = 4.00 s , the motorcycle starts to accelerate...
September 25, 2016

Algebra
A coaxial cable 10 feet long is cut into two pieces such that the length of one piece is two-thirds of the length of the other piece. Find the length of the shorter piece of cable.
September 25, 2016

Math
Solve the inequality: 1/4w +3 is less than -6
September 25, 2016

Chemistry
What is the volume of the oxygen produced when 1.00L carbon dioxide reacts with 20.0 g of Na2O2 based on the following unbalanced reaction at 25C and 2.00 bar? Na2O2 + CO2 -> O2 + Na2CO3 R = 0.083145 L bar K-1 mol-1 I got 1.57L but the answer is 500mL
September 25, 2016

economics
This chart shows the components of nominal GDP for the years 2000 and 2001. All figures are in billions of current dollars. Components 2000 2001 Consumption $6,684 $6,987 Investment $1,755 $1,560 Government Spending $1,751 $1,858 Exports $1,101 $1,034 Imports $1,467 $1,383 ...
September 23, 2016

Math
Emma estimated the first digit in the quotient of 2,183 ÷ 42 as 4. She adjusted the quotient. What did zhe do wrong? Explain
September 22, 2016

Algebra
The difference of two numbers is 47. The larger number is three less than six times the smaller number. Find the numbers.
September 16, 2016

Linear Algebra
Please , I don´t know how to do this demonstration: If A and B are mutually perpendicular vectors( different to zero vector) and "c" is any number show that : || A +cB ||>= ||A||
September 15, 2016

math
I would say around 5 or 6
September 15, 2016

Calculus
Hello I need help with this excersise of derivative of a inverse function. The excersise says: If f(x+2)=x^3+1 and g(x)=f(arctg x), find the derivative of the inverse function of g(x) and then calculate (g^-1 (9))'[the derivative of the inverse function evaluated in 9] . I...
September 14, 2016

math
half the difference of 4 from 14 added to 5
September 13, 2016

math
A hare is in a 100m race. it starts the race at a particular speed s. halfway through the race, it notices its losing, and increases its speed by an additional 15m/s. Write a formula for how long the hare took on the first half of the race, in terms of s.
September 12, 2016

mac1105
A driver averaged 43-miles per hour and took 6 hours to travel between two cities? What is the distance between the two​ cities?
September 12, 2016

Calculus
Well I cannot use L´Hopital´s Rule. :c
September 12, 2016

Calculus
Hello, I need help with this limit: Lim ((arctanx-x)/x^3) X->0 I can't use L'Hospital Rule or series. I don't get what to do. Can you give an idea?
September 12, 2016

Math
Sam ranks movies on a scale of 1-100. If he adds 2 points to each movie in his collection, and the range of the ranking was 54, what is the range when the 2 points are added ?
September 11, 2016

Math
If P^2+q^2 = 25 and 2 pq=10. What is the value of (p-q) ^2?
September 11, 2016

Statistics
.2
September 10, 2016

Calculus
I really need help. Create an appropriate table of values for the function f(x)=tan3x/7x and use the reslut to estimate lim as x approaches 0 tan3x/7x
September 7, 2016

Chemistry
Hello I need help with this excersise: How many moles of NH4Cl are neccesary to add to 1 liter of solution of Co2+ 0,20 M in order to prevent the precipitation when the solution is saturated with H2S (0,1M) and the pH is 7,50. It 's known that pKbNH3=4,75 ; Kps(CoS)=2,0&...
September 2, 2016

CHEMISTRY
CALCULATE THE DECREASE IN TEMPERATURE FOR 22.0 G SILVER THAT LOSES 625 J
September 2, 2016

Math
Blake watched 1/6 of a movie on Friday,3/5 of amovie on saturday, and the rest on sunday. What fraction of the movie did he watch on Sunday?
August 30, 2016

Algebra2
Is it y=6x?
August 29, 2016

Science
What science field is Vantablack considered to be part of?
August 13, 2016

statistics
A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4 and 1 kilograms of ...
August 8, 2016

Social studies
if a savings account can suddenly buy much more than before does that mean deflation is occuring?
August 1, 2016

counseling
D: All of the above
July 24, 2016

Algebra
An aeroplain flies at a constant altittude of 4000 flies above sea level.at it start to land it descend at a constant rate at X rate per mins .at what altittude is the plane Ymins after it begins to descend
July 21, 2016

penn foster child care
A pre schooler should drink ____________ ounces of milk each day
July 18, 2016

pre algebra
A flower bed is in the shape of a triangle with one side twice the length of the shortest​ side, and the third side is 30 feet more than the length of the shortest side. Find the dimensions if the perimeter is 138 feet
June 30, 2016

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