Friday

August 28, 2015
Total # Posts: 337

**Physics**

A steel beam is used in the construction of a skyscraper. By what fraction L/L0 does the length of the beam increase when the temperature changes from that on a cold winter day (-20°F) to that on a summer day (+108°F)?
*April 17, 2008*

**PHYSICS**

Oil is flowing with a speed of 1.30 m/s through a pipeline with a radius of 0.315 m. How many gallons of oil (1 gal = 3.79 10-3m3) flow in one day?
*April 14, 2008*

**English expression**

The first one is correct. Because you don't have candy in a plate, you have it on a plate, and candy even though we know it is plural you would use "is"
*April 2, 2008*

**college algebra**

Let f(x)= x^5/120 - x^3/6 + x Find the local minima and maxima, then determine where the function is decreasing and increasing. Basically, I just need to know how to type this correctly in my calculator so I can get the right minima and maxima. I had: local minima: f(-1.59)=-1...
*April 2, 2008*

**math**

Determine whether the functions are even, odd, or neither. (a) f(x) = x²/√x²+ 1 (b) g(x) = x^3 - √ x- 7
*April 2, 2008*

**french**

Only with etre and reflexive verbs, do the subjects agree.
*April 2, 2008*

**college algebra**

Ok I started by diving by 12 to get x² + y² + 3/2y = 0 then x² + y² +3/2 + ____ = 0 + ____ then (3/2)² = 3/4 (3/4)² = 9/16 and got the equation x² + y² + (3/2)y + 9/16 = 0 + 9/16 here is where I am confused x² + [y+(3/4)]² = (3...
*April 2, 2008*

**college algebra**

Would you start by dividing everything by 6? then after that I am confused
*April 2, 2008*

**college algebra**

Identify the center and radius of the circles represented by the following questions (a) 3x² - √3x+3y²-y+ 1/12=0 (b) 12x² + 12y²+42y=0
*April 2, 2008*

**chem**

A sample of hydrogen has a volume of 1100 mL when the temperature is -0.899999999999999 degC and the pressure is 0.888 atm. What will be the volume of the gas at STP?
*March 28, 2008*

**chem**

A sample of fluorine has a volume of 3.6 L when the temperature is 112.3 degC and the pressure is 922 torr. What will be the volume when the pressure is 88.48 kPa and the temperature is 140.4 degC?
*March 28, 2008*

**chemistry**

A sample of chlorine has a volume of 2.5 L when the temperature is 84.1 degC. Assuming that the pressure is constant, at what temperature will the volume be 1750 mL? (Express your answer in Kelvins.)
*March 28, 2008*

**Physics**

During a tennis serve, a racket is given an angular acceleration of magnitude 155 rad/s2. At the top of the serve, the racket has an angular speed of 13 rad/s. If the distance between the top of the racket and the shoulder is 1.5 m, find the magnitude of the total acceleration...
*March 26, 2008*

**Physics**

You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 45 N·m. Using the data in the drawing, determine the magnitude F of the force that you must exert on the wrench. Lenght of the wrench is ....
*March 24, 2008*

**Physics**

An automatic drier spins wet clothes at an angular speed of 4.8 rad/s. Starting from rest, the drier reaches its operating speed with an average angular acceleration of 3.6 rad/s2. How long does it take the drier to come up to speed?
*March 6, 2008*

**Physics**

A motorcycle has a constant speed of 24.0 m/s as it passes over the top of a hill whose radius of curvature is 129 m. The mass of the motorcycle and driver is 330 kg. Find the magnitude of (a) the centripetal force and (b) the normal force that acts on the cycle. I found the ...
*March 5, 2008*

**Physics**

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated...
*March 3, 2008*

**Physics**

A cyclist approaches the bottom of a gradual hill at a speed of 20 m/s. The hill is 4.4 m high, and the cyclist estimates that she is going fast enough to coast up and over it without peddling. Ignoring air resistance and friction, find the speed at which the cyclist crests ...
*February 25, 2008*

**Physics**

A cyclist approaches the bottom of a gradual hill at a speed of 20 m/s. The hill is 4.4 m high, and the cyclist estimates that she is going fast enough to coast up and over it without peddling. Ignoring air resistance and friction, find the speed at which the cyclist crests ...
*February 25, 2008*

**Physics**

Batman (mass = 90 kg) jumps straight down from a bridge into a boat (mass = 530 kg) in which a criminal is fleeing. The velocity of the boat is initially +20 m/s. What is the velocity of the boat after Batman lands in it?
*February 25, 2008*

**physics**

A 0.052-kg arrow is fired horizontally. The bowstring exerts an average force of 80 N on the arrow over a distance of 0.75 m. With what speed does the arrow leave the bow?
*February 25, 2008*

**algebra**

p=2l+2w solve for l
*February 23, 2008*

**algebra**

p=2l+2w forl
*February 22, 2008*

**physics**

A person pulls a toboggan for a distance of 40.0 m along the snow with a rope directed 15.0° above the snow. The tension in the rope is 69.0 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed ...
*February 19, 2008*

**Physics**

A 97.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.70 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.80 m/s2?
*February 18, 2008*

**electromagnetism**

Why does the speed of wind have no affect on a homemade electromagnetic generator attatched to a windmill? I did an expiriment using a windmill and altered the wind speed 3-11mph. There was no change in the amount of amps genrerated. Are my results just wrong or is there a ...
*February 11, 2008*

**Mathematics!**

She would have to be 2.22 repeating for them to have a tie. Yoku actually runs 8 yards in ten seconds
*January 8, 2008*

**Math -**

PLEASE HELP ME FIGURE THIS PROBLEM! Solve equation and check the solution -3(r+5) = 3(r - 1)__________________
*November 12, 2007*

**languege arts**

rentcuy
*November 4, 2007*

**math**

I have 5 pieces each is a triangle and they are supposed to somehow form a large triangle. Everyone has tried and we can't figure it out. I see lots of solutions online for 7 piece tangrams but nothing for a 5 piece. Thank you Zach I suspect there are 180 solutions to this...
*August 10, 2007*

**algebra**

evaluate the numerical expression 2 (14-7) + 5 Is the 2 supposed to be an exponent of something? Where does it go?
*May 16, 2007*

**Physical Science**

What are the 4 nuclear forces? Out of the 4 which one is the strongest and which one is the weakest? Thanks http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html THANK YOU As a side note, these are not nuclear forces. They are the four fundamental forces in nature, ...
*April 11, 2007*

**drivers ed**

It is a crossword puzzle nine letters long. Vital to vehicle saftey
*March 14, 2007*

** Why dogs are better than Cats!**

shouldn't we just get over it and just finish this stupid debate
*November 24, 2006*

**Algebra**

-6h + 4 - 3 + h = 11 4-3-11=6h-h -10=5h -2=h
*September 21, 2006*

**unscramble**

afsedrniru
*September 6, 2006*

**Science guys :)**

hey guys a got a few problems i need help with im really desperate for help theyre due soon online :( 1.Suppose that a constant current of 89 mA flows in a conductor. Find the absolute value of the total charge that passes through the conductor in 3 minute(s). Charge = ______ ...
*August 31, 2005*