Sunday

September 21, 2014

September 21, 2014

Total # Posts: 1,807

**Physics**

What is the time lapse between seeing the lightning strick and hearing the thunder 17 km away
*February 23, 2011*

**physics**

A mass of 0.755 kg is attached to a horizontal spring of constant 403 N/m as shown. The system is compressed a distance xa = 20.8 cm from its equilibrium position and released from rest. The coefficient of friction on the surface is μ = 0.354. The mass comes to rest again...
*February 23, 2011*

**Physics**

emily, the question is 72 CM, not 72 meters. convert the 72cm into .72m. (mass) X (Speed)2/(distance .72) - (mass)(gravity) for the other other one add the two together.
*February 22, 2011*

**Math**

two people aged 15 and 50. At some point during their lives, the elder will be three times the age of the younger. Write an equation which models how old in years each will be when the elder will be three times as old as the younger person.
*February 20, 2011*

**PHYSICS**

A copper vat is 10 m long at room temperature (20 degrees C). How much longer it is when it contains boiling water at 1 atm pressure? Air in a balloon does 50 J of work while absorbing 70 J of heat. What is its change in internal energy? A bottle containing 3 kg of water at a ...
*February 17, 2011*

**Math**

Determine whether u and v are orthogonal,parallel, or neither. u=-2i+j v=3i+6j
*February 16, 2011*

**Math**

An airplane has an airspeed of 724 kilometers per hour at a bearing of 30 degrees.The wind velocity is 32 kilometers per hour from the west. What are the groundspeed and the direction of the plane?
*February 16, 2011*

**General Chemistry 1**

If you heat copper sulfate pentahydrate to long or at too high of a temperature, what compound(s) is formed?
*February 14, 2011*

**math 2**

What is the scale factor for 1 inch = 20 feet?
*February 10, 2011*

**Calc**

derivative of (x^2+14)/x
*February 8, 2011*

**Chemistry**

the value 3.0x10^-5 was wrong for me?
*February 8, 2011*

**Calculus-particle motion**

1. A particle is moving on the x-axis (or any number line) Its position x(t), or distance from the origin, at the time t is given by x(t)=4t^3-16t^2+15t. t is greater than or equal to 0 a.) Where is the particle when it is at rest? b.) During what time interval is the particle...
*February 7, 2011*

**Biology**

In a cell undergoing meiosis, which sequence of events is shown in correct order? A. the cytoplasm divides, chromosomes line up at the equator, nuclear envelope forms. B. chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the ...
*February 4, 2011*

**Physics**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of the crate at the bottom of the ramp
*February 3, 2011*

**Physics-Help Please!!!**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp
*February 3, 2011*

**Physics**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp.
*February 3, 2011*

**Physics**

Marko 1.51^2 /g doesn't equal 2.2801g it equals 2.2801/g. So your answer is the reciprical of the right answer. Nice try though.
*February 3, 2011*

**algebra**

You have to subract the second equation from the first equation. Make sure to put the second equation in parenthases and distrbute the negative sign!
*February 2, 2011*

**chemistry**

An unknown metal will be used in this experiment. If you do not remove the moisture between trials houw would moisture effect the dendity in a graduated cylinder calculation?
*January 31, 2011*

**Dynamics**

Car A is moving at a constant speed Va=75 km/h, while car C is moving at a constant speed Vc=42 km/h on a circular exit ramp with radius p=80m. Determine the velocity and acceleration of C relative to A.
*January 30, 2011*

**Calc**

Suppose that a function f(125)=52 and f'(125)=4. Estimate f(123.5)
*January 29, 2011*

**Calc**

suppose that f(x) is a function of f(125)=52 and f'(125)=4. estimate f(123.5)
*January 29, 2011*

**chemistry**

How many molecules of ethane (C2H6) are present in 0.524 g of C2H6?
*January 28, 2011*

**Biology**

Which of the following statements about sexual and asexual reproduction is FALSE? A)Genetic diversity occurs in sexual reproduction. B)Asexually reproducing organisms can repair their own DNA. C)There are no special reproductive cells in asexual reproduction. D)A gametophyte ...
*January 28, 2011*

**12th grade chemistry**

If the reaction below proceeds with a 96.8% yield, how many kilograms of CaSO4 are formed when 5.27 kg SO2 reacts with an excess of CaCO3 and O2? 2 CaCO3(s) + 2 SO2(g) + O2(g) 2 CaSO4(g) + 2 CO2(g)
*January 27, 2011*

**math**

a sum of 102,000 is to be split by 3 people, (1) gets 5 times as much as (2) which gets 2/5 as much as (3). how is this problem solved
*January 26, 2011*

**Business**

Hey guys. I really need your help picking out a new business name. Which do you like/find catchier??? The business is a local "swapping" online site. Thanks a lot. SwapEm Swap Ventures SwapEm Local
*January 26, 2011*

**physics**

Explain the effect increasing temperature has on the following situations and what is happening at the molecular level to cause it. (a) the speed of sound in air (b) the current in a wire THANKS
*January 25, 2011*

**Calculus**

find the limit of lim 7= as x approaches 8
*January 24, 2011*

**math**

where did you get the 2?
*January 20, 2011*

**math**

how do you find the square root of 49x^5?
*January 20, 2011*

**science project**

need to take an object from point a to point b and back to a and your only allowed to touch the project once to start. any ideas? No batteries, electric or blowing on it allowed. You can use water and magnets.
*January 16, 2011*

**math**

im pretty sure its 256. These r permutations right
*January 13, 2011*

**math**

mr. m has an 8 inch by 11 inch sheet of paper. He created a box by cutting congruent squares from each corner.The base of his box is 54 square inches.How much did he cut from each corner.
*January 13, 2011*

**Science**

nucleus
*January 13, 2011*

**physics**

A 1200 kg car is traveling at 45 km/h and hits a 1000 kg car parked on the edge of a 70 m deep canyon. What is the velocity of the two car wreck?
*January 12, 2011*

**math**

it is a typo the problem starts at the word Jocelyn
*January 12, 2011*

**math**

J1 3/4 Jocelyn is currently 1 3/4 feet taller that 2/3 her brother's height. If jocelyn is 4 1/2 feet tall then how tall is her brother jesse? How much taller is Jocelyn
*January 12, 2011*

**Math**

In a right triangle, if the median from the right angle to the hypotenuse is 5 in. what is the length of the hypotenuse?
*January 11, 2011*

**9th grade alegbra**

u^2-8=7u
*January 11, 2011*

**PreCalc**

That does not seem right to me because when i graph it, they turn out different.
*January 10, 2011*

**PreCalc**

Write the following expression as one logarithm: 2logx-log4-log3+logx. Simplify your answer.
*January 10, 2011*

**Math**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**Math**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**Pre-Calc**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**math**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**Physics**

An alpha particle (mass=6.68x10^-27kg)is emitted from a radioactive nucleus with an energy of 5.00MeV. How fast is the alpha particle moving in m/s? (1 MeV= 1.6x10^-13J). I dont know how to start to solve this problem A.2.40x10^7 m/s B.1.55x10^7 m/s C.3.70x10^6 m/s D.1.85x10^6...
*January 10, 2011*

**math**

a cab charges the following fare for ea. trip...first 1/4 mi $2.95 for every additional 1/4 mi or part $0.65 (a)what is the fare for a distance of 1 5/8 mi? my answer...I got $8.85 (b) what is the fare for a didtance of 10 3/4 mi? My answer...$30.25 (c)what is the possible ...
*January 9, 2011*

**physics**

if the length of a pendulum is 0.8m what is the period if the angular deflection is 30 degrees?
*January 9, 2011*

**physics**

a motorist runs out of gas and must push his 3000kg car across a flat road 200m to the gas station. ignoring friction how much work must be done in order to get the car to the gas pump? if the motorist accomplishes this in 10 minutes, how much power has he applied? what if the...
*January 8, 2011*

**science**

find a chart to help with blood types and rh. allele combinations
*January 6, 2011*

**lgrammer**

can you give me an example of a sentence with subject pronoun, action verb, adverb phrase, verb, subordinating conjunction, adverb, linking verb, subject, infinitive phrase?
*January 6, 2011*

**math**

f by 5ftind area of shaded rectangle to nrarest tenth. rectangle has circle in middle. the shaded area is 3ft
*January 5, 2011*

**Physics**

A 0.40-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless surface. If the cord will break when the tension in it exceeds 60 N, what is the maximum speed the ball can have? How would your answer be affected if there were ...
*December 24, 2010*

**acc 225**

An antique store has one employee who is given cash and sent to garage sales each weekend. The employee pays cash for any merchandise acquired that the antique store resells.
*December 19, 2010*

**Calculus AB**

A police car is chasing a suspect. The policemen is at point y=0.6 (north of an intersection) and the suspect is at point x=0.8 (east of the intersection). The police car is traveling at 60mph. Their radar gun reads that the suspect's car is getting away at a rate of 20mph...
*December 16, 2010*

**5th grade**

what is the magnitude estimate for 78.6 divided by 6
*December 16, 2010*

**algebra**

what did the beaver say to the tree? using only these letters egatkwolifunydcsmb. you may use these letters more than once
*December 14, 2010*

**science**

the temperture in which all motion of particles stop
*December 13, 2010*

**5th grade**

$12
*December 13, 2010*

**Algebra-Did I even begin correctly? **

Thank you
*December 13, 2010*

**Algebra-Mathmate, Reiny or Dr. Bob-please double check-Did I even begin correctly? **

Please check the above problem-Thank you
*December 13, 2010*

**Algebra-Did I even begin correctly? **

would 27/3^2 = 3 then in the equation so I would write it as log(6)3 Thanks for trying to help-I appreciate it-maybe I can repost for mathmate or Dr. Bob or Reiny
*December 13, 2010*

**Algebra-Did I even begin correctly? **

How would I write log(6)27-2log(6)3 as a single logarithm Would I start by getting rid of the (-2)- I know its the same log6 but what would I do with the 27 and the 3 I'm really confused on this one and I have to solve several similar ones with no clue on how to it-I'...
*December 13, 2010*

**Algebra II**

How would I write log(6)27-2log(6)3 as a single logarithm I'm confused on this one Thanks for any help you can provide
*December 13, 2010*

**geometry**

Given a circle with the radius of 2, which is the degree measure of an arc whose length is 1/2 pi?
*December 10, 2010*

**SOCIAL STUDIES**

What qualifications are needed for a country to become a world power?
*December 9, 2010*

**Matth**

Kenneth works for albertsons as a cashier. He earns $9.25 per hours and he works 20 hours each week. Write an expression that could be used to determine his total earnings for 1 year
*December 7, 2010*

**MATH **

I don't get it?
*December 7, 2010*

**12U Physics**

An object is moving down a ramp that has mu=0.150. It initially starts at (0,1), and the bottom of the ramp is at (sqrt(3),0) Show that the parametric down the ramp are given by: ht tp://img819.imageshack.us/img819/5993/screenhunter03dec061758.gif I know the kinematics ...
*December 6, 2010*

**physics**

thanks, that helped a lot!
*December 6, 2010*

**physics**

okay the question i got was asking the lengths of the first, second, and third waves of a standing wave, of a string that is fixed at both ends. the strings length is 2.38 meters. Ive already figured out the three lengths, being 4.76, 2.38, and then 1.59. how would i figure ...
*December 6, 2010*

**physics**

okay the question i got was asking the lengths of the first, second, and third waves of a standing wave, of a string that is fixed at both ends. the strings length is 2.38 meters. Ive already figured out the three lengths, being 4.76, 2.38, and then 1.59. how would i figure ...
*December 6, 2010*

**college physics**

9.5 cm
*December 6, 2010*

**science**

Tell Nartker that he's an ass
*December 5, 2010*

**physics**

A source of sound (1200 Hz) emits uniformly in all directions. An observer 2.99 m from the source measures a sound level of 41.1 dB. Calculate the average power output of the source.
*December 5, 2010*

**physics**

okay the question i got was asking the lengths of the first, second, and third waves of a standing wave, of a string that is fixed at both ends. the strings length is 2.38 meters. Ive already figured out the three lengths, being 4.76, 2.38, and then 1.59. how would i figure ...
*December 5, 2010*

**physics**

okay the question i got was asking the lengths of the first, second, and third waves of a standing wave, of a string that is fixed at both ends. the strings length is 2.38 meters. Ive already figured out the three lengths, being 4.76, 2.38, and then 1.59. how would i figure ...
*December 5, 2010*

**Physics**

A vertical cylindrical cylinder, closed at the bottom end, contains 0.0100 moles of gas. It is fitted at the top with a piston, which can move freely. The mass of the piston is 14.0 kg and the initial height of the piston above the bottom of the cylinder is 25 cm. What is the ...
*December 5, 2010*

**Physics**

An automobile tire has a volume of 0.0185 m3. If the pressure in the tire is 500 kPa and the temperature is 298 K, how many molecules are there inside the tire?
*December 5, 2010*

**Calc**

A wire 100 inches long is to be cut into two pieces. One of the pieces will be bent into the shape of a circle and the other into the shape of a equilateral triangle. How should the wire be cut so as to maximize the sum of the area of the areas of the circle and triangle will ...
*December 2, 2010*

**Statistics**

YES!
*December 2, 2010*

**physics**

heat transfer is what the problem is... you need the specfic heat of water (how water reacts to the increase of heat) or dw(t)/dh (change of water temp with respect to heat added) etc etc its calorie/gram °C = 4.186 joule/gram °C make sure the units are the same and ...
*November 22, 2010*

**algebra**

x = one hour thirty minutes?
*November 22, 2010*

**Physics**

sum of forces-> F=ma F(friction)= ufn* you don't need this F(applied)-F(friction)=ma f(a)-f(f)=ma f(a)/ma=f(f) add numbers
*November 22, 2010*

**Grade 10 Math**

-b over 2a to find x value for max and add that to the 3 metres
*November 20, 2010*

**chemistry**

A gaseous mixture contains 75 grams of N2 and 25 grams of Ar. What is the pressure due to Argon?
*November 17, 2010*

**Honors PRE CALCULUS**

Thanks so much! My teacher never gave is that equation. She just told us to go home and try to learn the method.
*November 16, 2010*

**Honors PRE CALCULUS**

Three different weights are suspended from three different springs. Each spring has an elasticity coefficient of 18.5. The equation for the vertical displacement is y= 1.5cosine(t times the square root of k/m), where t is time, k is the elasticity coefficient, and m is the ...
*November 16, 2010*

**Honors PRE CALCULUS**

Three different weights are suspended from three different springs. Each spring has an elasticity coefficient of 18.5. The equation for the vertical displacement is y= 1.5cosine(t times the square root of k/m), where t is time, k is the elasticity coefficient, and m is the ...
*November 16, 2010*

**11th grade**

Three different weights are suspended from three different springs. Each spring has an elasticity coefficient of 18.5. The equation for the vertical displacement is y= 1.5cosine(t times the square root of k/m), where t is time, k is the elasticity coefficient, and m is the ...
*November 16, 2010*

**Chemistry**

What is the structure of SN? I thought .:S=N:: or ::S=N:. but both were deemed wrong by the homework software we have... help!
*November 9, 2010*

**math**

how to devide 34/123.08
*November 8, 2010*

**Physics HELP HELP**

A cue ball traveling at 4.0 m/s makes a glancing, elastic collision with a target ball of equal mass that is initially at rest. The cue ball is deflected so that it makes an angle of 30° with its original direction of travel. (a) Find the angle between the velocity vectors...
*November 8, 2010*

**Physics**

61 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 29 m/s. If the player was moving upward with a speed of 4.0 m/s just before impact, what will be the speed of the ball immediately after the collision if the ...
*November 7, 2010*

**Physics**

A pitcher claims he can throw a 0.157 kg baseball with as much momentum as a 1.5 g bullet moving with a speed of 1.50 multiplied by 103 m/s. (a) What must the baseball's speed be if the pitcher's claim is valid? m/s (b) Which has greater kinetic energy, the ball or the...
*November 6, 2010*

**Physics**

Using P=(RnT)/V, where T=1(arbitrary constant), and R = 8.314: Calculate volume at initial condition. Use this volume and final pressure to calculate n final. Subtract n final from n inital.
*November 5, 2010*

**trig**

A bicyclist is riding at 15 mph and her bike has wheels with a radius of 14 inches. She rides over a wad of gum which sticks in the tire. Assume this is t=0 seconds. a.)Find a function that gives the height in inches above the ground of the gum, with the input in seconds. Also...
*November 3, 2010*

**Algebra**

-3x + 2y = 2
*November 2, 2010*

**Algebra**

-3x + 2y =2
*November 2, 2010*

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