Wednesday

September 28, 2016
Number of results: 56,316

**Math**

The formula W = 35.74 + 0.6215T - 35.75V^4/25 + 0.4275TV^4/25 relates the wind chill temperature W to the air temperature T in degrees Fahrenheit and the wind speed V in miles per hour. Use a calculator to find the wind chill to the nearest degree when the air temperature is ...

*January 12, 2015 by Anonymous*

**physics**

A person is stretching by putting their arms straight over their heads and bending forward at their ankles until their hands are pushing against the wall in front of them. As they stretch, they keep stepping back from the wall, leaning further forward. The coefficient of ...

*July 12, 2012 by Jessica*

**soil mechanics**

The following results were obtained from a CU on two samples: Test no. Confining stress (kPa) Deviatoric stress (kPa) Pore pressure (kPa) 1 100 400 -20 2 300 760 60 a) Determine c and ƒÖ for total stress and effective stress condition. b) What is the deviatoric stress at ...

*December 4, 2013 by WYNN*

**Managerial Economics**

anyone has answer to this? Discussion question As vice president of sales for a rapidly growing company, you are grappling with the question of expanding the size of your direct sales force (from its current level of 60 national salespeople. You are considering hiring from 5 ...

*September 19, 2010 by Matt*

**MATHS (EQUATIONS)**

A piece of stone loses its 1/5 th of weight when it is weighted in water and a piece of iron loses 1/10th of its weight under the same condition. The total weight of the both materials in air is 280grams and in water is 240 grams. Find the weight of both the materials ...

*August 22, 2016 by A GOODSTUDENT*

**Maths**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -10t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in meters/sec and “k” is the initial height in meters (as if you were on ...

*February 19, 2010 by Anonymous*

**physics**

A certain string breaks when a force of 225 N is exerted on it. If two people pull on opposite ends of the string , each with a force of 175 N , will the string break? What actions reaction pairs of forces would be involved?

*March 26, 2012 by Isabella*

**Physics**

you slide a 325-N trunk up a 20.0 degree incline plane with a constant velocity by exerting a force of 211 N parallel to the incline plane a)what is the component of the trunk's weight parallel to the plane ? b)what is the sum of your applied force ,friction and the parallel ...

*October 19, 2009 by Amanda*

**Physics**

Three cylindrical blocks x, y and z are made of different materials of densities 2g/cm3, 5g/cm3 and 10g/cm3 respectively. If the side of each block resting on a level surface has an area of 2cm2, 4cm2 and 6cm2 and the height of block x is 10cm calculate; 1) weight of block x 2...

*February 28, 2015 by JUBA*

**chemistry**

A saturated solution of NaCl (dissolved in water) has a concentration of 4.01 M at a given temperature. The solution has a volume of 1 L (1000 mL). If the water were to evaporate until the volume of the solution is 500 mL (and then stirred), what would the concentration of ...

*February 14, 2013 by Avi*

**ALGEBRA**

The temperature, T, of a given mass of gas varies inversely with its volume, V. The temperature of 20 cm3 of a certain gas is 15°C. What will the temperature be when it is compressed to a volume of 5 cm3? • 10°C • 300°C • 6.67°C • 60°C How?

*May 5, 2014 by Sandra*

**physical science**

a piece of metal has a mass of 85 cg and a volume of 450L. What is its density in g/cm^3? What would be the mass of 300cm^3 of this metal? What would be the volume of 200 ounces of this metal?

*March 3, 2016 by anita*

**physics**

write down the uncertainty in the volume of the cylinder (3.36*10^-2) write down the minimum uncertainty with which the volume of the cylinder can be determined (1.79*10^-2) it says to compare these values and discuss briefly. I figured out how to find them but I'm not certain...

*February 15, 2009 by Anna*

**Physics **

A horizontal water pipe goes from a large diameter to a small diameter and then back to the first diameter as shown in the figure below. The level of water (8cm in the larger tube and 4 cm in the constricted tube) in the small vertical tubes provides us with information about ...

*December 4, 2015 by Anna*

**physics**

a girl pulls a 12.0 kg wagon along by exerting a force of 15.0 N on the wagons handle, which makes an angle of 20.0 degrees with the horizontal. Friction provides a force of 11.0 N in the opposite direction. How long does it take for the wagon, which is initially at rest, to ...

*November 1, 2009 by arriell*

**Physics**

A potential energy function for a two-dimensional force is of the form U = 3 x^(4)y - 8 x. Find the force that acts at the point (x, y). (Use x and y as appropriate.) I know its something about partial derivatives but I'm not sure how to go about it. And the answer has to be ...

*February 7, 2010 by Eng*

**AP 1 Physics**

A motorcycle has a constant speed of 25.0 m/s as it passes over the top of a hill whose radius of curvature is 144 m. The mass of the motorcycle and driver is 326 kg. Find the magnitudes of the following. Centripetal force: mv^2/r = 1414.93 N Normal force: ?? I tried N = mg...

*November 3, 2015 by Lulu*

**chemistry**

A ballot at 35 degrees celsius has a volume of 2.5 liters. what is its volume at 45 degrees celsius ?

*February 28, 2011 by Anonymous*

**Thermodynamics**

A combined seperating and throttling calorimeter was used to determined the dryness fraction of steam flowing through a steam main at a pressure of 900kPa. The pressure and temperature after throttling were 100kPa and 110C respectively. The mass of water collected in the ...

*December 7, 2010 by Kay*

**science**

humidity is the amount of water vapor in the air at a given time.if the air at 75 degrees holding the maximum amount of moisture that it can,and the temperture suddenly drops to 60degrees,what is likely to be the result? a)precipitation will be released in the form of hail. b)...

*October 11, 2007 by yaz*

**AP Physics**

In a period of 2s, 4.8E23 nitrogen molecules strike a wall area of 8.6 cm^2. If the molecules move at 308 m/s and strike the wall head-on in a perfectly elastic collision, find the pressure exerted on the wall. The mass of one N2 molecule is 4.68E-26kg. Answer in terms of kPa...

*November 15, 2009 by JL*

**Calculus AB**

Find a, b, c, and d such that the cubic function ax^3 + bx^2 + cx + d satisfies the given conditions Relative maximum: (2,4) Relative minimum: (4,2) Inflection point: (3,3) So this is what I have so far: f'(x) = 3a^2 + 2bx + c f''(x) = 6ax + 2b f(2) = a(8) + b(4) + c(2) + d= 4...

*November 18, 2011 by Savannah*

**math**

Business and finance. The following scores were recorded on a 200-point final examination:193, 185, 163, 186, 192, 135, 158, 174, 188, 172, 168, 183, 195, 165, 183.(a) Find the mean final examination score.(b) Find the median final examination score.(c) Is the mean or median a...

*April 11, 2007 by carmen*

**Chemistry!!**

A 100.0 g sample of ethanol at 25.0 degrees celsius is heated and boiled completely to vapor at its boiling point. How much heat does it absorb? i did.... q=100.0 *2.44*43.5=10,614 J q=100.0*2.44*53.5=13,054. then i added the two q's together and i got 23,700 J. is that right...

*May 4, 2008 by Miley*

**English**

1. A research paper has which of the following aspects in common with an essay? A. a title page B. a works cited list C. body paragraphs with topic sentences D. personal experience as a primary source 2. When citing all sources, which answer lists the items that must be ...

*April 17, 2015 by Jay*

**Algebra**

I know what the answer is just not how to exopress it. Can someone help me please? State the domain of the function: f(x)(2+x)/(3-x) Now I know the domain is (-infinity,3) U (3, infinity)? (-infinity,3] U [3, infinity) ? How do I express it? do I use ] brackets or open at the ...

*July 27, 2009 by Cassie*

**Algebra**

I know what the answer is just not how to exopress it. Can someone help me please? State the domain of the function: f(x)(2+x)/(3-x) Now I know the domain is (-infinity,3) U (3, infinity)? (-infinity,3] U [3, infinity) ? How do I express it? do I use ] brackets or open at the ...

*July 27, 2009 by Cassie*

**math**

Analyze It Questions: 1. Since the purpose of an ice cube is to keep a drink cold, is it better for an ice cube to have a high volume or a low volume? Why? (At least 3 sentences.) 2. Since heat touching the surface of an ice cube causes it to melt, is it better for an ice cube...

*March 11, 2016 by cheyann *

**math**

Find the weight of the contents of a right rectangular prism with length 1 ft, width 6 ft, and height 2.5 ft if the contents weigh 0.02 pounds per cubic inch. I think the answer is 31.2. Is this right?

*November 13, 2007 by robert*

**math**

a refrigerator is 3 ft wide, 2.5ft deep,and 6ft high. The walls and other parts other refrigerator take up to 20ft. How much cubic feet are left for food?

*March 2, 2011 by justin*

**mAtH**

a cylindrical barrel is 2.8 feet in diameter and 8 feet high. If a cubic foot holds about 7.5 gallons of liquid, how manygallons of water will this barrel hold? Aghhhh! I completely don't get it!!

*May 17, 2011 by audrey*

**Chemistry**

Calculate the pH of a solute where 24.5 mL of 0.1 mol/L HCl is added to 25.0 mL of 0.1 mol/L NaOH. How much excess OH is there? .5ml .1M or 5E-5 moles. That is in a volume of 49.5ml So if OH concentration is that moles/volume, what is the H+ concentration? Remember the product...

*May 31, 2007 by Raj*

**calculus**

The volume of grains in a silo at a particular time (measured in hours) is given by V (t) = 4t(3-t)m^3 Find the rate of change of the volume of grains in the silo from first principles (using the definition of the rate of change)

*April 30, 2012 by Dave*

**math**

An alcohol solution consists of 6 gallons of pure water and x gallons of alcohol, x > 0. Let f(x) be the ratio of the volume of alcohol to the total volume of liquid. [Note that f(x) is the concentration of the alcohol in the solution.] (a) Find a possible formula for f(x).

*April 23, 2013 by emily *

**math**

An alcohol solution consists of 6 gallons of pure water and x gallons of alcohol, x > 0. Let f(x) be the ratio of the volume of alcohol to the total volume of liquid. [Note that f(x) is the concentration of the alcohol in the solution.] (a) Find a possible formula for f(x).

*April 23, 2013 by emily *

**College Physics **

A positive and a negative charge are positioned as shown: + | 3.00 meters - _______| 4.00 meters Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What is the angle of West of south? 3. What is the force of + on -? 4. What is the ...

*September 1, 2010 by Lucy*

**College Physics **

A positive and a negative charge are positioned as shown: + | 3.00 meters - _______| 4.00 meters Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What is the angle of West of south? 3. What is the force of + on -? 4. What is the ...

*September 1, 2010 by Lucy*

**physics**

A horizontal force of 20 N acted on a 10 kg mass at rest. The force accelerated the mass over a rough surface so that the mass had a speed of 6.0 m/s after 5.0 seconds. How much friction was acting on the mass?

*October 15, 2010 by Liz*

**Physics**

A person pushes horizontally with a force of 270 N on a 55 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.25. What is the magnitude of the frictional force? What is the magnitude of the crate's acceleration?

*October 21, 2010 by Sam*

**physics**

A 280 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m.

*October 28, 2010 by Anonymous*

**applied physics**

A cyclist and her bicycle have a combined mass75.okg. If the frictional force acting against the of the bicycle is -23.5, what force must the cyclist apply to maintain a constant velocity?

*August 22, 2011 by solomon*

**physics**

A person pushes horizontally with a force of 170 N on a 68 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.22. (a) What is the magnitude of the frictional force? (b) What is the magnitude of the crate's acceleration?

*October 11, 2011 by Andrew*

**Physics**

A person pushes horizontally with a force of 190 N on a 67 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.23. (a) What is the magnitude of the frictional force? (b) What is the magnitude of the crate's acceleration?

*October 23, 2011 by Ty*

**Physics**

A dockworker applies a constant horizontal force of 82.0 to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 12.5 in a time 4.60 .

*January 12, 2012 by Michael*

**Physics**

A cyclist and her bicycle have a combined mass of 75.0kg. If the frictional force acting against the motion of the bicycle is -23.5N, what force must the cyclist apply to maintain a constant velocity?

*March 7, 2012 by Brent *

**Mechanics M1**

Q.1 Find the force needed to accelerate a 2 kg block at 3m/s^2 up a rough plane (coefficient of friction 0.2) inclined at 25 degree to the horizontal if the force is a) Parallel to the slope b) horizontal c) at 45 degree to the upward verticle

*April 29, 2012 by Jat*

**physics**

Your friend has slipped and fallen. To help her up, you pull with a force F, as the drawing shows. The vertical component of this force is 130 newtons, and the horizontal component is 140 newtons.whats the magnitude north ?

*August 23, 2012 by Anonymous*

**Physics**

A 0.17 kg baseball moving at +20.80 m/s is slowed to a stop by a catcher who exerts a constant force of -376 N. How long does it take this force to stop the ball? How far does the ball travel before stopping?

*October 18, 2012 by Angela*

**PHYSICS**

Two point charges q1 &q2 seperated by a distance of 3.0 m experience a mutual force of 16x10^-15N.Calculate the magnitude of charge when q1=q2=q. What will be magnitude of force if seperation between the charges is changed to 6.0m?

*June 3, 2013 by Megha*

**physics**

A car that weifgs 15000 n is initially moving at 60 km/hr when the brakes are applied. The cae is broight to a stop in 30 m. Assuming the force applied by the brakes is constant, determine the magnitude of the braking force.

*July 25, 2013 by yvonne gray*

**science**

Newton’s law of universal gravitation is rep- resented by F=GMm r2 Here F is the gravitational force, M and m are masses, and r is a length. Force has the SI units kg · m/s2. What are the SI units of the proportionality constant G? 1. m2/(kg2 · s2) 2. m/(kg · s2) 3. m2/kg 4. N...

*August 31, 2013 by dani*

**physics**

A 0.20 kg baseball moving at +25.20 m/s is slowed to a stop by a catcher who exerts a constant force of -387 N. A)How long does it take this force to stop the ball? B)How far does the ball travel before stopping?

*December 12, 2013 by Najah*

**Physics**

An iron disk has a radius of 0.625 m and a mass of 217 kg. The disk is mounted on its axis so that it is free to spin. How much force is required if the force is applied at a distance 19.5 cm from the axis of rotation?

*November 21, 2014 by Ann*

**physics**

A(n) 1949.1 kg car is coasting along a level road at 22.9 m/s. A constant braking force is applied, such that the car is stopped in a distance of 74.6 m. What is the magnitude of the braking force? Answer in units of N

*November 23, 2014 by mb, hnb*

**physics**

A(n) 1949.1 kg car is coasting along a level road at 22.9 m/s. A constant braking force is applied, such that the car is stopped in a distance of 74.6 m. What is the magnitude of the braking force? Answer in units of N

*November 23, 2014 by Anonymous*

**physics**

Your car is stuck in the mud. you have 2 pulleys, rope, and a sturdy tree. ignoring friction how much force can you apply to the car if you are able to pull on the rope with 150lbs of force?

*November 28, 2014 by katie*

**physics**

A(n) 2153 kg car is coasting along a level road at 34.4 m/s. A constant braking force is applied, such that the car is stopped in a distance of 61.8 m. What is the magnitude of the braking force? Answer in units of N

*November 9, 2015 by colton*

**physics**

A(n) 2165.7 kg car is coasting along a level road at 35.5 m/s. A constant braking force is applied, such that the car is stopped in a distance of 52.7 m. What is the magnitude of the braking force? Answer in units of N.

*November 22, 2015 by Saykar*

**Physics**

A 4.96 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.7N at an angle theta=16.0degrees above the horizontal. What is the magnitude of the acceleration of the block when the force is applied? I know a=F/m

*February 16, 2016 by Emily*

**Algebra-base Physics**

A single conservative force Fx= (6.0x-12) N, (x is in m), acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of 20J at x=0. What is the potential energy at x=3.0m?

*March 30, 2016 by Sasha Yazzie*

**physic**

Two forces of magnitude 4.ON ans 7.0N act on a small object b. The angle btw the direction along which the force is 50 degree.determine the magnitude *nd direction of d resultant force on d body b.

*May 15, 2016 by samuel*

**physics**

a body is at equilibrium under the action of three forces.one force is 10N acting due east and one is 5N in the direction 60¡ã northeast . what is the magnitude and direction of the third force

*August 19, 2016 by hamza*

**chem**

I just need to know the net ionic equation and balance them. I figured the equation. but the net and balance is harder. Co(NO3)2 (aq) + NaOH (aq) = CoOH (s) + Na(NO3)2 (aq) Co(NO3)2 (aq) + Na2CO3 (aq) = CoCO3 (s) + Na2(NO3)2 (aq) Co(NO3)2 (aq) + Na3PO4 (aq) = CoPO4 (s) + Na3(...

*February 18, 2012 by Ari*

**physics**

write down the uncertainty in the volume of the cylinder that you calculated in part 4 of the error analysis (i got 3.36*10^-2). Also write down the minimum uncertainty with which the volume of the cylinder can be determined. Compare these two values and discuss briefly.

*February 15, 2009 by Anna*

**math-PLEASE CHECK AND HELP**

find the surface area and volume of the right circular cylinder. The radius is 3 and height 6. This is what I put for volume: v=pir^2h pi(3cm)^2 6 cm= 54pi cm cubed can you please check this and show work on how to do the surface area? Thanks.

*May 16, 2010 by crystal*

**Chemistry**

I did a simple distillation and a fractional distillation to purify acetone. How do I determine the concentration of acetone? (Instructions say this is not a simple M=mol/L calculation). My guess was to divide the volume of purified acetone by the volume of unpurified acetone...

*October 23, 2012 by helllp*

**physics**

A cylinder with a radius of 15 km is built in space for use as a space station. This cylinder is rotating about its long axis to generate ‘artificial gravity’. When people walk on the inner surface of the spinning cylinder, the normal force between their feet and that surface ...

*July 12, 2012 by Jessica*

**Physics**

W have three air carts (labeled #1, #2, and #3) on an air track. The carts are equipped with spring bumpers so that all collisions are elastic. The masses of the carts are m1 = 5m, m2 = 2m, and m3 = m. Initially, cart #1 is given a velocity to the right of magnitude v0 and the...

*October 25, 2015 by Whitney*

**Chemistry**

I posted this question a bit ago and received some help..but need more.. thanks Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been ...

*April 12, 2007 by Julia*

**Chemistry**

The data below has been taken for the reaction of a dye with the hydroxide ion. The reaction was performed at two different hydroxide ion concentrations while the dye concentration was kept constant. What is the rate law? [OH─] = 0.10 M [OH─] = 0.20 M t (min) Abs ...

*March 13, 2014 by Nicole*

**Physics**

A tank holds 135 moles of argon gas (atomic mass = 6.633521 × 10^-26 kg) at a pressure of 101300 Pa and a temperature of 302K. Recall that the number of gas molecules is equal to Avagadros number (6.022 × 10^23) times the number of moles of the gas 1) What is the volume of the...

*February 9, 2016 by Billy*

**Algebra**

An air plane can travel 560 miles per hour with the wind and 480 miles per hour against the wind. Determine the speed of the plane in still air and the speed of the wind.

*March 28, 2013 by Lora*

**Chemistry **

Hey guys I was wondering if you guys know the answer to this: Which of the following is NOT true of colligative properties? Colligative properties are... A. independent of the chemical identity of the solute. B. responsible for lowering the vapor pressure of a solution versus ...

*April 11, 2010 by Alex*

**Calculus: Optimization**

I have no idea how to approach this problem, if someone knows just how to relate h, r with H,R, that would be extremely helpful and I can workout the rest! Thank you in advance. Given a right circular cone, you put an upside-down cone inside it so that its vertex is at the ...

*February 17, 2015 by Jazz*

**english**

i need help to unscramble this word crydabu..can't figure this one out Try these: http://www.ssynth.co.uk/~gay/anagram.html http://www.unscramble.net =)

*March 31, 2007 by Kristyn*

**Chemistry**

1. Calculate the acetylsalicylic acid concentration (in mg/mL) of aspirin solution #2 in the Procedure section. Assume that 300 mg of acetylsalicylic acid has been weighed out. 2.3. (3 pts) Calculate the acetylsalicylic acid concentrations (in mg/mL) of solutions A through E ...

*April 10, 2012 by Cassie*

**Math**

A worker tearing down a barn uses a crowbar 4feet long with the shorter end being 2 inches from the fulcrum. If the worker can exert a force of 150lbs at one end of the crowbar, how great a force can be exerted at the other end? (Note the differences in units, 2 inches and ...

*July 13, 2009 by Al*

**Physics**

A 77 kg window cleaner uses a 13 kg ladder that is 7.1 m long. He places one end on the ground 3.8 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 3.9 m up along the ladder when the window breaks. Neglect friction between the ladder ...

*April 16, 2014 by Ali*

**Physics**

A 75 kg window cleaner uses a 10 kg ladder that is 7.2 m long. He places one end on the ground 4.5 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 5.2 m up along the ladder when the window breaks. Neglect friction between the ladder ...

*November 14, 2014 by Anonymous*

**PHYSICS**

A 75 kg window cleaner uses a 10 kg ladder that is 7.2 m long. He places one end on the ground 4.5 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 5.2 m up along the ladder when the window breaks. Neglect friction between the ladder ...

*November 14, 2014 by Anonymous*

**social studies**

gender issues applied to learning and development Boys’ stereotypes in k-12 to Grade 2 . How these issues will affect boys’ learning and development? Girls’ stereotypes in K-12 TO Grade 2. – How these issues will affect girls’ learning and development? There have been many ...

*December 6, 2006 by Abigail*

**Home Economics**

Why Home Economics? Is it only about cooking? http://hearth.library.cornell.edu/ In the framed box, there is a brief history of the term "home economics" and how it originated, etc. Be sure you click on various links, and you'll find additional information. http://members....

*October 11, 2006 by Terri Ordona*

**English 2**

I have to do a 1000 word essay paper detailing the research of a career that is of interest to me.I picked a teacher but cant find any info on it. I have to get things like salary scale, retirement plans,daily duties,typical hours worked,types of training required,etc.I would ...

*December 3, 2006 by Tim*

**English**

Thank you very much for the help! Here is the rephrase I found in the sparknotes. 1) Shakespeare has unhooked his work from time and place. The witches tell us that the next time they meet, it will be with Macbeth, and that this will occur before the sun goes down, when the ...

*February 17, 2011 by Mike*

**Physics**

A projectile is fired up into the air at a speed of 164 m/s at an angle of 37° relative to the horizontal. Ignore air drag. A.) Determine the MAXIMUM HEIGHT (above where it was thrown) the projectile will reach. m B.) Determine how LONG the projectile will be in the air. ...

*September 6, 2012 by Cindy*

**Physics**

it didnt let me put the link to image.. A tube of radius 5 cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×105 Pa. The density of water is 1000 kg/m3. Assume that the water ...

*April 27, 2010 by Chris*

**Physics ( using earth to find pressure of planet y**

3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Imagine a planet of the same radius ...

*September 10, 2015 by Kim*

**Calculus**

Consider the solid that lies above the square (in the xy-plane) R=[0,2]*[0,2], and below the elliptic paraboloid z=100−x^2−4y^2. (A) Estimate the volume by dividing R into 4 equal squares and choosing the sample points to lie in the lower left hand corners. (B) ...

*April 14, 2010 by Salman*

**physics**

in different parts of a car air conditioner a liquid changes to a gas and a gas changes to a liquid. a)which of these changes causes the cooling?why? b)describe how the air conditioner removes heat from the car's cabin. can someone please help??thank you so much! it takes heat...

*May 14, 2007 by Emma*

**Physics**

Any assistance explaining how to work this would be great! The force exerted by the wind on the sails of a sailboat is Fsail = 480 N north. The water exerts a force of Fkeel = 240 N east. If the boat (including its crew) has a mass of 350 kg, what are the magnitude and ...

*February 24, 2012 by Student*

**Physics. PLEASE HELP!!**

A uniform disk with a mass of 130 kg and a radius of 1.2 m rotates initially with an angular speed of 950 rev/min. A constant tangential force is applied at a radial distance of 0.5 m. How much work must this force do to stop the wheel? Answer in units of kJ

*April 20, 2012 by Amber*

**Physics Help Please!!!! Urgent!!**

In an experiment, a boar (2600 kg) slows down from 11 m/s to 8 m/s in 5 sec when the engine is stopped. a) Determine the drag force. b) Using this information, what is a good approximation of the forward thrust force needed to keep the boat cruising at a constant speed of 9 to...

*October 15, 2014 by Jesicca*

**chemistry**

Block A of an unknown metal has a volume of 125 cm3. Block B of a different metal has a volume of 145 cm3. If block A has a greater mass than block B, what can be said of the relative densities of the two metals? (Assume that both blocks are solid.)

*September 1, 2014 by lexie*

**phyzzzics**

I NEED ANSWERS AND HOW YOU GOT IT~!! 3. If you use a horizontal force of 30.0 N to slide a 12.0-kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? 4. A force of 4.0N is large enough to overcome ...

*December 6, 2009 by johnica!*

**Chemistry Eq. Question**

3H2(g) + N2(g) reverse reaction arrow 2NH3(g) What factors would affect the equilibrium constant for the reaction above? (Select all that apply.) increasing the H2 concentration decreasing the NH3 concentration increasing the temperature decreasing the temperature increasing ...

*March 29, 2010 by Jeena*

**Science**

is heat added or removed in the following 1)grapes turn into raisins 2)frost forms ona cars windshield at night 3)moistuure forms ont he outside of a glass filled with a cold drink

*October 11, 2007 by Cyleste*

**Science**

How does physics apply in a homemade glass xylophone? [8 glasses of same size filled with water at different levels for pitch, and tapped with a spoon to make the sound] I know it has something to do with waves and sound, but I'm not quite sure what else. Thank you!

*October 22, 2008 by Marisol*

**Bridgeway Academy**

Math A fish aquarium has a capacity of 2 gallons of. If it was already filled with two quarts plus one pint of water, how much water would need to be added to completely fill the tank?

*December 4, 2015 by Emily*

**Physics**

A crate with a mass of 110 kg glides through a space station with a speed of 2 m/s. An astronaut speeds it up by pushing on it from behind with a force of 240 N, continually pushing with this force through a distance of 4 m. The astronaut moves around to the front of the crate...

*November 18, 2012 by Emily Tran*

**physics**

A crate with a mass of 110 kg glides through a space station with a speed of 2 m/s. An astronaut speeds it up by pushing on it from behind with a force of 240 N, continually pushing with this force through a distance of 4 m. The astronaut moves around to the front of the crate...

*November 18, 2012 by Emily Tran*