Saturday

February 28, 2015

February 28, 2015

Total # Posts: 32

**Physics**

A device for training astronauts and jet fighter pilots is designed to rotate a trainee in a horizontal circle of radius 10.2 m. If the force felt by the trainee on her back is 7.61 times her own weight, how fast is she rotating? (in m/s) Express your answer in revolutions per...
*February 11, 2015*

**Physics**

A child sitting 1.39 m from the center of a merry-go-round moves with a speed of 1.21 m/s. Calculate the centripetal acceleration of the child. (in m/s^2) Calculate the net horizontal force exerted on the child (mass = 22.5 kg). (in N)
*February 10, 2015*

**Physics**

An elevator in a tall building is allowed to reach a maximum speed of 3.55 m/s going down. What must the tension be in the cable to stop this elevator over a distance of 2.30 m if the elevator has a mass of 1270 kg including occupants? (in N)
*February 10, 2015*

**Physics**

A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 29.8° above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.400 and 0.320, respectively. The box slides down unless the...
*February 10, 2015*

**Trigonometry**

Plz help
*October 19, 2013*

**Trigonometry**

n-1/n divided by 1+1/n
*October 19, 2013*

**Math, Please help!**

I'm having a hard time in math, and every time I start my test my eyes glaze over. Can anyone please help me out? (9m+6)+(-5m-6) (3r^2+7r+1)+(4r^2-8r-2) (6h+1)-(9h+4) (-7w^2-2w-1)-(-5w^2 +3w-2)
*May 20, 2013*

**Math, Please help!**

I'm having a hard time in math, and every time I start my test my eyes glaze over. Can anyone please help me out? (9m+6)+(-5m-6) (3r^2+7r+1)+(4r^2-8r-2) (6h+1)-(9h+4) (-7w^2-2w-1)-(-5w^2 +3w-2)
*May 20, 2013*

**History**

is it A
*June 6, 2012*

**Calc**

Find the volume formed by rotating the region enclosed by: x = 8 y and y3 = x with y ≥ 0 about the y-axis
*March 5, 2012*

**Calc2**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y = x2, y = 1; about y = 6
*March 2, 2012*

**DUE AT MIDNIGHT PLEASE HELP- Calculus**

A trough is 5 meters long, 1 meters wide, and 4 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 4 meters, and base, on top, of length 1 meters). The trough is full of water (density 1000 kg/m3 ). Find ...
*February 27, 2012*

**math**

no other criteria was given
*January 26, 2012*

**math**

a 2 digit number, divisable by 6, the 10s unit is 1/2 of the digit unit
*January 26, 2012*

**physics**

car comes to a stop over distance of 30.0m after the driver applies brakes. If the car decelerates @ contant rate of 3.50m/s2, what was the car's origianl sped?
*September 18, 2011*

**Chemistry**

Determine the pH of 263 ml of solution which has [NH 4I] = 0.300 M. Kb = 1.74 × 10-5 for NH3(aq)
*April 14, 2011*

**Chemistry**

I managed to get it :) though for others who might be looking to solve this for their practice questions Convert Kb to Ka Ka = kw/Kb then just use an ice table with Ka=x^2/ 0.300M-x (x is small) and just -log[H3O+)
*April 14, 2011*

**Chemistry**

Determine the pH of 263 ml of solution which has [NH 4I] = 0.300 M. Kb = 1.74 × 10-5 for NH3(aq)
*April 14, 2011*

**algebra**

dimensions: 320x640 max. area 204800
*November 30, 2010*

**8th grade**

very fast
*February 1, 2010*

**math **

a local gas station uses the formula c= 0.635L+ 6.25 to charge customers who want to buy gasoline and a car wash what is the total cost if you buy 20L of gasoline? please help!
*January 31, 2010*

**9th grade**

how much heat is needed to change 20g of ice at negative 10 degrees c to water vapor at 200 degrees c
*January 5, 2010*

**Physics**

Ok... but I still don't get it... Is there a formula type thing that could help me?
*December 6, 2009*

**Physics**

Yes - if it is the same person answering it - it is me again! My question has STILL not been answered... How would I solve for upwards acceleration with this kind of image, assuming mass and force are given.
*December 6, 2009*

**Physics**

How would I go about calculating the acceleration of a mass being pulled up an inclined plane at an angle. Given - mass, and presumably angles So the object is being pulled up an angle at another angle.
*December 6, 2009*

**Physics**

But what about the second angle? There is another one besides theta that I don't know what to do about - but that explanation just helped alot with all the other problems!
*December 5, 2009*

**Physics**

Compute the net force along the direction of the plane, making sure to subtract friction (if any) and the component of weight along the plane (W sin A). -That is the part that I don't get how to do...
*December 5, 2009*

**Physics**

How would I go about calculating the acceleration of a mass being pulled up an inclined plane at an angle. Given - mass, and presumably angles
*December 5, 2009*

**Sequences and Series**

PreCal. What is the difference between the equations (n(n+1))/2, and n/2(ti+tn)?? Under what conditions would you use them? Thanks much!!!
*January 10, 2007*

**proof by mathematical induction**

subject is PreCalulus. 2^(k+3) = and < (k+3)! i know how to do proving using mathematical induction when its just an equal sign, but I dont understand what to do when its an inequality. thank you!!! Here is what I would do Step 1: check if it is true for k=1 that is: let k=...
*January 5, 2007*

**Math**

What is quantity and how do you use it. A quantity is how much you have of a particular quality or substance. You can use it to compare to other quantities to see if they are more or less. Depending on what you desire — more or less — you might adjust the situation...
*August 28, 2006*

**FACTORING HELP ASAP**

i dont know how this works.. but im helping my friend with some factoring and i have a few questions
*February 11, 2006*

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