Friday

January 20, 2017
Total # Posts: 226

**Physics**

You push your couch a distance of 3.6 m across the living room floor with a horizontal force of 198.0 N. The force of friction is 151.0 N. What is the work done by you, by the friction force, by gravity, and by the net force?

*May 27, 2012*

**Physics**

A car of mass m = 1450 kg is traveling at a speed of v0 = 79 km/h (21.9 m/s). Calculate the work that must be done by the brakes to completely stop the car in kJ

*May 27, 2012*

**Physics**

That's what I figured but I wasn't sure because it talks about the negative side of the x-axis. However, looking at the question again, a) is the only answer that makes sense. Thank you.

*May 23, 2012*

**Physics**

1. A particle moved from point A to point B on the x-axis and had a positive displacement. Which one of the following is true? a. particle moved in the positive direction but it is on the negative side of the x-axis b. particle moved in the negative direction but it is on the ...

*May 23, 2012*

**Physics**

1. A particle moved from point A to point B on the x-axis and had a positive displacement. Which one of the following is true? a. particle moved in the positive direction but it is on the negative side of the x-axis b. particle moved in the negative direction but it is on the ...

*May 23, 2012*

**Biomaterials**

What is the theoretical density of tantalum (Ta) with the following characteristics: Crystal structure: BCC Atomic radius: 14.6 Angstroms Atomic weight: 180.9 g/...

*May 22, 2012*

**physics**

An outfielder throws a baseball with an initial speed of 30 m/s at an angle of 13° to the horizontal. The ball leaves his hand from a height of 1.75 m. How long is the ball in the air before it hits the ground?

*May 21, 2012*

**Mathematical Reasoning**

Just the floor and thanks Steve

*April 4, 2012*

**Mathematical Reasoning**

the circumference is 29.5 inches

*April 4, 2012*

**Mathematical Reasoning**

How many Men size basketballs fit into a 25' by 25' room?

*April 4, 2012*

**physics**

This problem was done wrong. same equation but the answer was solved incorrectly. Your solving for v2. so 72 should be divided by the 208 not the other way around. The answer should be less the 1. around 0.346.

*March 27, 2012*

**Math**

Suppose you invest $8000 at a nominal interest rate of 5.75% for 5 years. Find the accumulated amount if your account is accumulated yearly.

*March 20, 2012*

**Living ENvironment**

HOW do you know if it is snthesis or hydrolosis

*February 16, 2012*

**Living ENvironment**

can you give me a picture lock and key diagrams. I need to make my own lock and key diagram. I don't know the difference between synthesis and hydrolosis so can you give me some pictures and label them if they are hydrolosis or synthesis.

*February 16, 2012*

**math**

How do I figure the degree of measure from 18-24 people = 11%

*February 15, 2012*

**Physical Chemistry**

A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168Pa at this temperature. a) what is the volume of the dry air if the pressure is 1 bar? b) what is the final volume of the air saturated...

*February 6, 2012*

**chemistry**

How many grams of magnesium metal are produced by the decomposition of 19 grams of magnesium chloride?

*February 6, 2012*

**Math**

Show why the below equation is true using the areas of rectangles: 2p+5p=(2+5)p 3(4-1)=3x4-3x1

*January 30, 2012*

**Reading**

What's a description of Nicholas II and his Family that would go with the story Animal Farm?

*January 25, 2012*

**math (geometry)**

If p∨q is true, then what must be true about the truth values of p and q?

*January 15, 2012*

**Question**

Newport News is in VA dude

*December 20, 2011*

**calculus**

If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate at which the diameter decreases when the diameter is 9 cm. (Give your answer correct to 4 decimal places.)

*November 29, 2011*

**calculus**

The force F (in Newtons) required to move a box of mass m kg in motion by pulling on an attached rope is F(x) = f m g/(cos(x))+ f (sin(x)) where x is the angle between the rope and the horizontal, f is the coefficient of static friction and g = 9.8 m/s^2. Find the angle x that...

*November 14, 2011*

**calc**

Use the Mean Value Theorem to show: -x < sinx < x for all x > 0 (and where I have the inequalities, it's supposed to be less than or equal to for the first two and greater than or equal to for the last one, I just didn't know how to type it)

*November 3, 2011*

**Intermediate Algebra**

Find the x- y-intercepts and graph the function f(x)=5x-10

*October 18, 2011*

**Chemistry**

Alkali metals are so reactive that they react directly with water in the absence of acid. For Example... 2 K(s) + 2 H2O(l) ¨ 2 K+(aq) + 2 OH− (aq) + H2(g). How many milliliters of hydrogen will be evolved over water when 4.52 g K reacts with an excess of. H2O (l)?

*October 12, 2011*

**U.S HISTORY**

What are two reasons the French felt threatened by British interest in the Ohio River Valley?

*September 28, 2011*

**chemistry**

undersaturated. NaCl is about 36 grams when its temperature is 20 degrees C.

*July 10, 2011*

**Languge arts**

Who are the major characters in the book MAUS?

*April 11, 2011*

**Math Help**

a to the 9 power b to the 3 power / a to the 7 power b to the 8 power.( a^8b^8/ a^7b^8)

*April 3, 2011*

**Trig**

A Person is riding a bike with wheels that have a 14 inch radius at 15 mph. The bicyclist rides over some gum which sticks in the tire, assume this is t=0. 1. Find a function that gives the height in inches above the ground of the gum, with input is second

*March 30, 2011*

**math**

thank you!

*March 7, 2011*

**4th grade math**

does it have anything to do with division FIND the Mean: 11, 18, 13, 14. help please!

*March 7, 2011*

**math**

Find the mean of 11, 18, 13, 14. how do i go about it?

*March 7, 2011*

**chemistry**

The molar mass is an indirect relection of the polarizablity. Because molecules with higher molar masses often have more protons and thus more electrons the molecule will be more suseptable to polarizablity. Polarizing a molecule is deforming its electron cloud. Some molecules...

*March 4, 2011*

**chemistry**

Use the equation PV=nRT (pressure times volume equals moles of gas times constant times temperature). Assuming you aren't with-holding information, the number of moles of gas and the temperature must remain the same, so the initial Pressure and Volume must be equal to the ...

*March 3, 2011*

**Math - Nash equilibrium**

Part 1 Consider a variant of electoral competition on the line that captures features of the US presidential election. Voters are divided between two states. State 1 has more electoral college votes than does state 2. The winner is the candidate who obtains the most electoral ...

*February 28, 2011*

**chemistry**

You could definately check the boiling points to see if they are pure but that would kind of defeat the purpose of steam distillation. What compounds are you working with? Could you do some other test?

*February 17, 2011*

**geometry**

a rectangular-shaped garden has a length of 40 feet and a width of 15.how many more square feet of garden could be obtained by increasing both the length and width by 10 feet

*February 14, 2011*

**physics**

A crow sits on a clothesline midway between two poles as shown. Each end of the rope makes an angle of θ = 16° below the horizontal where it connects to the pole. If the combined weight of the crow and the rope is 8.4 N, what is the tension in the rope?

*February 14, 2011*

**Chemistry**

An ideal gas with an initial volume of 2.30L is cooled to 12.00 Celsius where its final volume is 1.85L. What was the temperature initially?

*February 7, 2011*

**college physics**

A cube of ice is taken from the freezer at -9.5 degree Celsius and placed in a 99 g aluminum calorimeter filled with 327 g of water at room temperature of 20.0 degree celsius. The final situation is observed to be all water at 17.0 degree Celsius. What was the mass of the ice ...

*January 18, 2011*

**physics**

A rock is dropped. How fast will the 5.0 kg rock be traveling in 4.0s if a 5.o N force of air resistance acts on it?

*December 16, 2010*

**Algebra 1**

6x^2+6x

*December 13, 2010*

**trig**

the height of a projectile is modeled by the equation y=-2x^2+38x+10, where x is a time, in seconds, and y is height, in feet, During what interval of time, to the nearest tenth of a second, is the projectile at least 125 feet above ground

*December 10, 2010*

**chemistry**

How many mL of a 0.90% (m/v) NaCl stock solution will you need to to prepare 250 mL of a 0.225% m/v NaCl solution?

*December 5, 2010*

**physics**

A 25 kg chair initially at rest on a horizontal floor requires 393 N horizontal force to set it in motion. Once the chair is in motion, a 301 N horizontal force keeps it moving at a constant velocity. a) Find the coefficient of static friction between the chair and the floor. ...

*November 18, 2010*

**Info. Tech (Computer Science)**

1.)(a) CPU 1 has speed of 2.6 GH (steps per second) and runs a program which needs 10.9 T steps. (b) CPU 2 has speed of 2.2 GH and runs program which needs 7.3 T steps. ---How long does it take for CPU 1 and CPU 2 to finish the work? (Show all work!) 2.)How many more more 4 ...

*November 17, 2010*

**chem**

The answer should actually be C6H8O7. The other user should have multiplied by 2.

*November 14, 2010*

**11th grade Math**

Two cars travel the same distance. The first car travels at a rate of 37 mph and reaches its destination in t hours. The second car travels at a rate of 54 mph and reaches its destination in 3 hours earlier than the first car. How long does it take for the first car to reach ...

*November 3, 2010*

**Math Grade 11**

Solve for d in this triangle |\ 1 | \ M| \ I | \ d L | \ E |___ \ | 90| x\ ------- x Is 60 Degrees The 90 Box is a right angle. THank you!

*November 3, 2010*

**Physics**

A 69.5 kg painter is on a uniform 30.0 kg scaffold supported from above by ropes . There is a 5.0 kg pail of paint to one side, as shown. The scaffold is 6 m long. 1.0 m on both ends and 4 m in the middle. From the left end at 1.0 m to the pail is 1.0 m. How close to the end ...

*November 3, 2010*

**10th grade**

If you have a graphing calculator just plug in y= (-4/3)x+(4/3) 4x+3y=4 -4x -4x 3y = -4x+ /3 /3 y = (-4/3)x+(4/3) I used (parenthesis) to show fractions.

*October 27, 2010*

**AP Chemistry**

insoluble bases include, Ni(OH)2 and Mg(OH)2.

*October 13, 2010*

**chemistry**

Fe(S)+ 2 HCl(ag) --> FeCL2(ag)+ H2(g What mass of H2 (g) is produced from the reaction of 5.2 Fe(s) with excess hydrochloric acid?

*October 13, 2010*

**Chemistry**

10.4

*October 13, 2010*

**Physics**

A small object of mass 3.00 g and charge -13 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?

*October 4, 2010*

**physics**

Two particles are in a uniform electric field whose value is +4000 N/C. The mass and charge of particle 1 are m1 = 1.0x10-5 kg and q1 = -15 µC, while the corresponding values for particle 2 are m2 = 3.0 x10-5 kg and q2 = +35.0 µC. Initially the particles are at ...

*October 4, 2010*

**physics**

I already figured it out MYSELF

*September 30, 2010*

**physics**

A 6.6 nC charge is located 2 m from a 4 nC charge. Find the magnitude of the electrostatic force that one charge exerts on the other.

*September 30, 2010*

**math**

You have a five gallon bucket and a three gallon bucket. How do you get exactly four gallons of water with using the five gallon and three gallon bucket?

*September 29, 2010*

**physics**

A Carnot engine operates between 170°C and 20°C. How much ice can the engine melt from its exhaust after it has done 6.0 104 J of work? i need a step by step process. you don't have to give me the answer.

*September 29, 2010*

**Physics**

One gram of water changes from liquid to solid at a constant pressure of 1.00 atm and a constant temperature of 0°C. In the process, the volume changes from 0.60 cm3 to 1.14 cm3. Find the work done on the water? Find the change in the internal energy of the water?

*September 29, 2010*

**physics**

A tennis player standing 11.5 m from the net hits the ball at 2.60° above the horizontal. To clear the net, the ball must rise at least 0.252 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racquet?

*September 19, 2010*

**Pre Calc**

find the magnitude and direction angle of the vector v, v=-2i+5j please help i have no idea how to do this. could you show me step by step?

*June 2, 2010*

**physics**

A merry go round has a radius of 3.5 meters. How far does a child standing at the edge travel (path length) if the wheel is rotated 13.0 radians?

*April 11, 2010*

**physics**

The force produced by Earth's gravity on a 70 kg man standing on the moon is more than 0.5 N True or False?

*April 11, 2010*

**physics**

A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth? I know how to do the work, but i can't...

*March 29, 2010*

**physics**

A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth?

*March 26, 2010*

**science**

Colon?

*March 19, 2010*

**5th grade math**

Wow thanks Ms. Sue!

*March 19, 2010*

**5th grade math**

What is the highest number of pi?

*March 19, 2010*

**English**

What type of writing dominated the American Age of Reason?

*March 19, 2010*

**English**

Why is Taylor's passage 'With rivers like green ribbons smaragdine' rich in imagery?

*March 19, 2010*

**english**

Upon passing the site of her burned home, Bradstreet

*March 19, 2010*

**english**

What happened to John Howland?

*March 19, 2010*

**English**

How long did the journey to Virginia actually take Smith and the colonists?

*March 19, 2010*

**physics**

A 755 N man stands in the middle of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a ...

*March 1, 2010*

**physics**

Barry Bee is flying through the air when he is struck by a truck. Which encounters more force, him or the truck?

*February 24, 2010*

**Physics**

While blowing its horn of f=524 Hz a car accelerates at 0.8m/s^2 the car starts from rest by your side and moves away. Find the time it taked for the frequency you hear to decrease by 5%. Hint: Don't forget to include the time it takes for sound to reach you any help would...

*February 22, 2010*

**physics**

i figured out everything except A)the force on tarzan from the vine

*February 21, 2010*

**physics**

Tarzan, who weighs 820 N, swings from a cliff at the end of a 20.0 m vine that hangs from a high tree limb and initially makes an angle of 22.0° with the vertical. Assume that an x axis extends horizontally away from the cliff edge and a y axis extends upward. Immediately ...

*February 21, 2010*

**physics-energy**

A toy gun uses a spring to project a 5.3 g soft rubber sphere vertically. The spring constant is 8.0 N/m, the barrel of the gun is 15 cm long, and a constant frictional force of 0.032 N exists between barrel and projectile. How high does the projectile go if the spring was ...

*February 19, 2010*

**math**

(x2-x1)/(y2-y1)

*February 19, 2010*

**Biology**

19. a 20. b 21. b 22. d

*February 19, 2010*

**Politics**

If an individual decides to drop out from running for office (Senate), what happens to the money that was donated and raised for the campaigning? Where does it go?

*February 18, 2010*

**Physics -energy**

A 80 kg diver steps off a 10 m tower and drops from rest straight down into the water. If he comes to rest 5.0 m beneath the surface, determine the average resistance force exerted on him by the water.

*February 18, 2010*

**Physics**

A horizontal force of 150 N is used to push a 33.0 kg packing crate a distance of 6.65 m on a rough horizontal surface. If the crate moves at constant speed and the work done is 997.5 joules. What is the coefficient of kinetic between the crate and the surface.

*February 18, 2010*

**Physics**

The answer is 433.719 joules. You find the sum of the x forces by taking 110*cos31.1 - 19.5*9.81*.156 which gives you 64.35 Newtons. You put that answer in the Work formula. Work equals force * distance so take 64.35*6.74 meters and you get your answer, 433.719 Joules.

*February 18, 2010*

**Math**

which fraction is the greatest 1/2 2/6 3/4 3/8

*February 17, 2010*

**Physics**

I got all but this problem. A 0.145-kg baseball is pitched at 42.0 m/s. The batter hits it horizontally to the pitcher at 58 m/s. A. Find change in momentum? Is it =.145*58-(-.145*42)=1.45-kg m/s? B. If bat and ball are in contact for 4.6 x 10-4 s, what is average force ...

*February 14, 2010*

**Physice**

I got all but this problem, I A 0.145-kg baseball is pitched at 42.0 m/s. The batter hits it horizontally to the pitcher at 58 m/s. A. Find change in momentum? Is it =.145*58-(-.145*42)=1.45-kg m/s? B. If bat and ball are in contact for 4.6 x 10-4 s, what is average force ...

*February 14, 2010*

**Physics**

Thank you.

*February 12, 2010*

**Physics**

An ice skater spins with his arms outstretched. When he pulls his arms in and raises them above his head he spins much faster than before. Did a torque act on the ice skater? If not how could his angular velocity have increased?

*February 12, 2010*

**french**

what does le premier etage mean

*January 25, 2010*

**6th grade**

Is as cool as ice an idiom?

*January 19, 2010*

**economics**

As tradition has it, Santa Claus is coming on the 5th of December from Spain to the Netherlands to bring gifts to Dutch children. Help is needed to distribute the gifts for which the Santa Claus committee is hiring helpers, so-called Zwarte Pieten. There are two types of ...

*December 30, 2009*