Saturday

September 5, 2015
Total # Posts: 33

**Physics**

A 5 gram bullet is fired horizontally and hits an 8 kg block of wood that is at rest and can move freely. The wood and the bullet move with a velocity of 0.05 m/s after the impact. What is the initial velocity of the bullet?
*September 13, 2014*

**Chemistry**

A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 824J of heat from its surroundings and has 0.62kJ of P−V work done on it by its surroundings. ...
*October 2, 2013*

**Chem**

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 650mL of a solution that has a concentration of Na+ ions of 1.50M ? Explain answer with three significant figures and ...
*September 25, 2013*

**vocab**

Industry antonym??
*March 28, 2013*

**Math **

Given a trapezoid ABCD with AD parallel to BC. The diagonals AC and BD are congruent. Prove that ABCD is an isosceles trapezoid.
*November 18, 2012*

**Math **

Given a trapezoid ABCD with AD parallel to BC. The diagonals AC and BD are congruent. Prove that ABCD is an isosceles trapezoid.
*November 18, 2012*

**Chemistry**

In acidic solution, VO_2^+1 is reduced to VO^2+, whereas Mn^2+ is oxidized to MnO_4^-1 . Given the partial equation VO_2^+1? +Mn^2+? ---> VO^2+ ? + MnO_4^-1? What must the coefficients be so that the electrons are balanced?
*October 2, 2012*

**Physics**

A turbine is spinning at 3600 rpm. Friction in the bearings is so low that it takes 15 min to coast to a stop. How many revolutions does the turbine make while stopping? Please show steps. Thank you!
*October 2, 2012*

**Physics**

A gray kangaroo can bound across level ground with each jump carrying it 8.4m from the takeoff point. Typically the kangaroo leaves the ground at a 23 angle. 1. Provide knowns and unknown values. 2. What is the initial velocity or takeoff speed? 3. What is its maximum height ...
*September 27, 2012*

**Chem**

What weight of sample containing 8.00 % Fe3O4 must be taken to obtain a precipitate of Fe(OH)3 that, when ignited to Fe2O3, weighs 150 mg?
*January 16, 2012*

**Physics**

A freight car with a mass of 29,000 kg rolls down an inclined track through a vertical distance of 2.8 m. At the bottom of the incline, on a level track, the car collides and couples with an identical freight car that was at rest. What percentage of the initial kinetic energy ...
*November 16, 2011*

**Algebra**

1) 4/vy^2 + 9/vy^2 2) 13/vy^2 3) That's it.
*October 25, 2011*

**math**

You can use the pythagorean theorem for this. a^2 + b^2 = c^2 1) 6^2 + 3^2 = ? 2) 36 + 9 = 45 <=square rooting this... 3) √45 => 3√5 cm of the hypotenuse 4) 6 + 3 + 3√5 = 9 + 3√5
*October 25, 2011*

**Physics**

A 0.59 kg mass is placed at the end of a vertical spring that has a spring constant of 68 N/m and eased down into its equilibrium position. A. Determine the change in the elastic potential energy of the system. B.Determine the system's change in gravitational potential ...
*October 25, 2011*

**Physics**

If it takes 470 J of work to stretch a spring 7.4 cm, what is the spring constant?
*October 24, 2011*

**Physics**

A 3.01 kg block slides down a frictionless plane inclined 18.6° to the horizontal. If the length of the plane's surface is 1.47 m, how much work is done, and by what force?
*October 24, 2011*

**Physics**

A baseball has a mass of .145 kilograms. A pitcher's fastball travels at 42 m/s. How much force is applied to the ball if the catcher stops the ball in .05 sec?
*October 18, 2011*

**math**

(n+ 6)(n+ 2)
*October 18, 2011*

**math**

Do you mean 124 times 124? If so, then it is 15376. Otherwise I have no idea what you're trying to ask...
*October 18, 2011*

**Math **

Are you asking for just the people with ONLY heart disease? If so, that means the doctor record 28 people out of 200 suffered from heart disease. That's 14%. Multiply 5000 by .14 and you would get 700 people are expected to suffer from heart diseases. If not, I'm ...
*October 17, 2011*

**math**

x -2 -2y= 3 x -5 = 2y y = x/2 -5/2 The slope is 1/2, so the perpendicular slope to it would be -2. For me, I find it easier to draw a graph. Find point (-2, -5) and draw a line with slope of -2. Once you hit the y-axis, the number on the axis is you're y-intercept. So the ...
*October 17, 2011*

**Physics**

In loading a fish delivery truck, a person pushes a block of ice up a 200 incline at constant speed. The push is 150N in magnitude and parallel to the incline. The block has a mass of 35.0 kg. What is the force of kinetic friction on the block of ice?
*October 17, 2011*

**math**

If you need it to be factored out, then 3a^3 + 12a^2 - 63a (That's how I'm going to write it out) can be divided out by 3a, so it turns out 3a(a^2 + 4a - 21). Next, you can further factor this out into two binomial groups using the reverse method of distribution (I ...
*October 17, 2011*

**algerba 2 **

1) x = 4y - 1 2) x + 1 = 4y 3) (x + 1) / 4 = y
*October 17, 2011*

**math**

The reason why you multiply the fraction by 100 is because the fraction less than one whole number. 2/3 means two thirds of a pie or a pizza. It's only partial of one pie. 1/1, 2/2, 5/5 is 100%. 3/2 is more than one whole number because 2/2 is equal to one, so it's ...
*October 17, 2011*

**Physics**

Thanks
*October 11, 2011*

**Physics**

A 5.0 kg wooden block is placed on an adjustable inclined plane. (For this problem, μs is approximately 0.55 and μk is approximately 0.25) a) What is the angle of incline above which the block will start to slide down the plane? b) At what angle of incline will the ...
*October 11, 2011*

**math**

Total number of marbles in the jar is 20. If the possibility you're asking for involves BOTH yellow and blue then there's 15 yellow and blue marbles. Divide 15 by 20 and you get 3/4, which is 75% possiblity :)
*August 22, 2011*

**physics**

A car starts from rest on a curve with a radius of 110 m and accelerates at 1.2 m/s^2 . 1) Through what angle will the car have traveled when the magnitude of its total acceleration is 2.1 m/s^2 ? Please show steps. thank you
*September 22, 2009*

**java programming**

Hunt the Wumpus is an early computer game, based on a simple hide-and-seek format featuring a mysterious monster (the Wumpus) that lurks deep inside a network of rooms. originally written by gregory yob
*November 29, 2007*

**java programming**

i'm almost done with this program but i can't figure out how to shoo the wumpus. i'm stuck as to how the shot direction has the wumpus in there. it's the last part of the main method is where i put it..please help thanks import java.util.*; public class ...
*November 29, 2007*

**science**

a tornado
*November 29, 2007*

**computers**

i have a java problem. i'm trying to write the hunt the wumpus game with simple conditions: (check-marked the ones i already accomplished) [x]the pits will be placed randomly [x] the wumpus is placed in the maze randomly (not sure if i did that one correctly) [x] the ...
*November 29, 2007*

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