Monday

February 27, 2017
Total # Posts: 3,796

**Physics**

How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?

*February 17, 2017*

**math**

A college student takes a standardized test and scores a 163. If the mean is 155 and the standard deviation is 7, what is the student’s percentile rank? (Assume a normal distribution.)

*February 14, 2017*

**Physics**

1. Calculate the kinetic energy of a 5.2kg object moving at 2.4 m/s 7. Calculate the potential energy of a 5.2kg object positioned 5.8m above the ground 21. Calculate the speed of a 5.2 kg object that possesses 26.1 J of kinetic energy.

*February 12, 2017*

**Grade 6: money and measures**

12

*February 7, 2017*

**chemistry**

a student performs the lab on an unknown metal and obtain the following data

*February 2, 2017*

**Physics**

a=47.6-0/17.6 a=2.705 seconds

*January 29, 2017*

**Physics**

The velocity graph of a particle moving along the x-axis is shown. The particle has zero velocity at t=0.00s and reaches a maximum velocity, vmax, after a total elapsed time, t total. If the initial position of the particle is x0 =6.22m, the maximum velocity of the particle is...

*January 29, 2017*

**Physics**

t= sqrt (8.306) = 2.88s d= 234m/s * 2.88s = 674.40m Thanks!

*January 29, 2017*

**Physics**

A cannon ball is fired horizontally from a cannon that is 40.7m above the ground. The initial velocity of the cannon ball is 234m/s. How much time does the cannon ball spend in the air?

*January 29, 2017*

**Math**

cos(x)/(1-tan(x)) + (sin (x))* cos(x))/ sin (x)-cos(x))

*January 29, 2017*

**chemistry**

the value would be too high because the density should have had a denominator that was a bit lower and a numerator of grams

*January 29, 2017*

**chemistry**

a pipet can be calibrated. we expected the volume to be 25.00ml, but the actual volume was significantly less. if you had measured the density of an unknown with this pipet and assumed that v=25.00ml, your result would not be correct. would it be too high or too low? Explain

*January 29, 2017*

**Science**

The surface r of a liquid depends on the density p acceleration due to gravity g nd height h use the method of dimension to derive the actual relationship between this quantities. An object is tie to the end of a string move in a circle the force exerted by the string depend ...

*January 29, 2017*

**chemistry**

Express the composition of each of the following compounds as the mass percents of its elements...? 59) Express the composition of each of the following compounds as the mass percents of its elements. a) formaldehyde, CH2O b) glucose, C6H12O6 c) acetic acid, HC2H3O2

*January 26, 2017*

**Math**

How do you find P if A=1/2a+P, and you have both the values of a and A?

*January 24, 2017*

**Writing Skills**

Just took the test and it actually was C. reference book

*January 17, 2017*

**Writing Skills**

B. Medicine, Thank you for the help

*January 17, 2017*

**Writing Skills**

The call number of the book that you're looking for is R865.2. What do you know about the book based on this information? A. It's a book of or about Roman literature. B. It's a book about medicine. C. It's a reference book. D. It's a book that can be gained...

*January 17, 2017*

**History**

If The British Government Could Do It Over Again The British governing policy of salutary neglect gave the young colonial governments a chance to "experiment" with their own self-governance. Gaining confidence in their abilities to rule the people without the British...

*January 17, 2017*

**Math**

Susie spent 4 1/4 hours on Monday and 3 5/8 hours on Tuesday working on a history project. About how long did she spend working on the project?

*January 16, 2017*

**Civic education**

alienable fundamental rights to whichie inherently entitled sumply because he or she is a human being.

*January 13, 2017*

**algebra**

I have to write and solve as literal equation.

*January 9, 2017*

**algebra**

I want to visit a friend that lives 200 miles away. Gas is $4 a gallon. My car gets 50 miles every 2 gallons of gas. How can I solve this using an literal equation?

*January 9, 2017*

**Maths**

A right circular cone of base radius 5 cm and depth 20 cm is held with its vertex downwards. If water is leaking through a small hole in the vertex at the rate of 8 cm^3/s, find the rate of change of the water level in the cone when the radius of the water surface is 4cm, ...

*January 7, 2017*

**Math**

The total number of football (x) and basketball (y) is 180. There are 30 more football than basketball. How many of each basketball and football are there?

*December 20, 2016*

**Physics**

Hello, Could anyone help me with something about rolling motion? Well the question is the next: Does static friction cause a positive work in the rolling motion? I really don't get how the static friction is involved in rolling and if it causes work Please help

*December 17, 2016*

**Algebra**

Hello....I was helped on this question earlier, but I don't understand why we divide by 2? Please help, please see the below: The president will order 5 turkey sandwich combos and 7 steak lunches and spends $124.00. The other president will get 10 turkey combos and 5 steak...

*December 12, 2016*

**Algebra**

Please help: The president will order 5 turkey sandwich combos and 7 steak lunches and spends $124.00. The other president will get 10 turkey combos and 5 steak combos for $140.00. How much is a turkey sandwich combo? Write a system of equation. 5x + 7y = $124.00 10x + 5y= $...

*December 11, 2016*

**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**

eat this hw t

*October 12, 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*