Monday

September 26, 2016
Total # Posts: 2,277

**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*

**Physics**

Use the equation Friction Force (Ff) =mu*N mu is a Greek letter representing the friction force and the N is the normal, or whatever the weight of the object is pushing down. So algebraically solve the equation by plugging in: 50=mu*500 50/500=mu so therefore 1/10=mu or 0.1 ...

*November 1, 2010*

**algebra**

two investments were made totaling $15,000. for a certain year these investments yielded $1432 in simple interest. part of the $15,000 was invested at 9% and part at 10%. find the amount invested at each rate. a total of $1150 was invested, part of it at 12% and part at 11%. ...

*November 1, 2010*

**Business Finance**

Jungle, Inc., has a target debt−equity ratio of 0.72. Its WACC is 11 percent, and the tax rate is 31 percent. (Do not include the percent signs (%). Round your answers to 2 decimal places. (e.g., 32.16)) Required: (a) If Jungle's cost of equity is 14 percent, its ...

*October 31, 2010*

**physics**

A 615 kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. (a) What is the acceleration of the car?

*October 26, 2010*

**grade 9 algebra**

8x-5y-x=9-y

*October 24, 2010*

**Physics**

horizontal

*October 21, 2010*

**Physics**

A 1.95 kg block is held in equilibrium on an incline of angle q = 53.1o by a horizontal force, F, applied in the direction shown in the figure below. If the coefficient of static friction between block and incline is ms = 0.313, determine the minimum value of F.

*October 21, 2010*

**math**

^Yo that's wrong

*October 20, 2010*

**Chemistry**

When 33.5 mL of 0.535 M H2SO4 is added to 33.5 mL of 1.07 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the individual volumes ...

*October 19, 2010*

**college algebra**

a bus driver wants to average at least 40 miles per hour on a 70 mile trip. if the first 35 miles takes the driver 1 hour what should be the lowest average speed for the second 35 miles?

*October 17, 2010*

**chemistry**

A 0.1943g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe 2+ (aq). The iron solution was titrated with Ce 4+ solution according to the balanced chemical reaction shown below.After calculation, it was found that 0.0237 g of iron from the ore ...

*October 17, 2010*

**ALgebra**

tom scores 83,88,75, and 90 on the first 4 tests in algebra. what does he need to get on the 5th test to have an average of 85?

*October 16, 2010*

**calculus**

Find d2y/dx2 in terms of x and y. y5 = x6

*October 15, 2010*

**caculus 1, please help **

Find d2y/dx2 in terms of x and y. y5 = x6

*October 15, 2010*

**calculus 1 **

So, What do u think how we solve this? :)

*October 15, 2010*

**algebra**

A cube measuring 6.7 cm along each edge has a mass of 78g. Find the density of the cube.

*October 14, 2010*

**math**

Train leaves a stationa traveling at 60 miles per hour. Eight hours later train B leaves the same station traveling in the same direction at 80 miles per hour. How long does it atke for train B to catch up to train A.?

*October 14, 2010*

**physics (projectile motion)**

A cow on a trebuchet is catapulted toward a castle wall. The cow is released with an inital velocity of 50 m/s at a 60 degree angle above the horizontal. At its release the cow is 8 m above the ground. The castle wall is 100 m from the trebuchet and the ground level of the ...

*October 13, 2010*

**physics (projectile motion)**

A cow on a trebuchet is catapulted toward a castle wall. The cow is released with an inital velocity of 50 m/s at a 60 degree angle above the horizontal. At its release the cow is 8 m above the ground. The castle wall is 100 m from the trebuchet and the ground level of the ...

*October 13, 2010*

**College Physics**

As part of a training program, an athlete runs while holding 8.00 weights in each hand. As he runs, the weights swing through a 30.0 arc in . His hands are 72 from his shoulder joint, and they are light enough that we can neglect their weight compared with that of the 8.00 ...

*October 10, 2010*

**Us History**

8. 4th amendment, search and seizure

*October 10, 2010*

**Spanish 1**

Thank you

*October 10, 2010*

**Spanish 1**

Thank you-I appreciate the explanation

*October 10, 2010*

**Spanish 1**

Which subject pronoun would you use in Spanish to talk about: Jauana y Carlos a. ellos b. usted c. ustedes d. ella I'm not sure because I think Juana is a girl and so how do you talk about a girl and boy Thank you

*October 10, 2010*

**algebra**

the time that a traffic light remains yellow is 1 second more than 0.05 times the speed limit. what is the yellow time for a trafic light on a street with a speed limit of 30 mi/h

*October 9, 2010*

**college physics**

Two workers are loading crates onto a pick up truck. Worker 1 lifts his crate straight up from the ground to the truck. Worker 2 slides his crate up a ramp which has frictionless rollers. Which statement is true about the work being done on the crate? a. Worker 1 does more ...

*October 5, 2010*

**college physics**

Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the ...

*October 5, 2010*

**college physics**

Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.

*October 5, 2010*

**college physics**

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can...

*October 5, 2010*

**physics**

Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the ...

*October 5, 2010*

**physics**

Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.

*October 5, 2010*

**physics**

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can...

*October 5, 2010*

**physics**

Two workers are loading crates onto a pick up truck. Worker 1 lifts his crate straight up from the ground to the truck. Worker 2 slides his crate up a ramp which has frictionless rollers. Which statement is true about the work being done on the crate?

*October 5, 2010*

**chemistry**

using the values for heat of fusion, specific heat of water, or heat of vaporization, calculate the amount of heat energy. Calories needed to warm 20.0g of water at 15 degrees Celsius to 72 degrees Celsius (one step) Show work please

*October 3, 2010*