Monday

August 29, 2016
Total # Posts: 568

**physics**

A 30.0 g bullet strikes a 0.595 kg block attached to a fixed horizontal spring whose spring constant is 6.66 103 N/m and sets it into vibration with an amplitude of 21.8 cm. What was the speed of the bullet before impact if the two objects move together after impact? answer ...
*September 26, 2011*

**physics**

When a 69 kg person climbs into a 1000 kg car, the car's springs compress vertically by 2.9 cm. What will be the frequency of vibration when the car hits a bump? Ignore damping. answer should be given in Hz.
*September 26, 2011*

**Algebra**

2/5x^4-23x^2+1/15 x^4+5x^2-5 Simplify each expression.
*September 25, 2011*

**pre-algebra**

If a and b are any real numbers, is the statement a x b = b x a always true? Why or why not?
*August 29, 2011*

**algebra**

If a and b are positive numbers, then is a -b is always??
*August 28, 2011*

**Pre Cal**

Let the line X-2Y=15 and the circle with equation X^2+Y^2=50 intersect at the points A and B. Algebraically find the coordinates of A and B using the information given.
*August 26, 2011*

**Geography**

I need an easy way to remember the followingg states: Montana, Wyoming, Colorado, New Mexico, Arizona, Utah, Idaho, Washington, Oregon, Nevada, and California. I have to know the capital and where it is located on the u.s. map .
*August 24, 2011*

**Chemistry**

How many calories are absorbed when 56.0 g of liquid water at 100C is vaporized to steam at 100C?
*August 8, 2011*

**MAth**

1. John’s loans for his business total $155,000. One of the loans is a SBA loan at 11% interest; the other loan is a Community Business Partner loan whose interest is 6.5% After one year the loans accumulated $12,325 in interest. What was the amount of each loan? I am not...
*July 29, 2011*

**physics**

1. An object traveling at a constant speed of 22m/s begins to experience a force of 15N in the opposite direction of its motion. (Hint given: Start by finding objects acceleration) a. How long will it take for the 8kg object to come to a complete stop once it experiences the ...
*June 21, 2011*

**Phyics**

If a 68kg object is being pulled across the hard floor with a horizontal force of 400N... a. What would the acceleration of the object be if it was on a frictionless floor? b. if there were friction, what would the force of friction be if it was pulled at a constant velocity? ...
*June 21, 2011*

**boooring chemistry!!:(**

Halogens are non-metals and if observed they form ionic bonds with metal because halogens have a high ionization energy to attract the metals. if you don't know what ionization energy is it means the energy need to to remove the electrons from an atom. Halogens also form ...
*June 21, 2011*

**physics**

How do you know that is net vertical force is equal to 0? Also what does Ffriction stand for?
*June 21, 2011*

**physics**

1. There are three forces acting on an object, a 30N force pulling right, a 50N force pushing right, and 30N frictional force pushing left. a. What is the force of gravity on this 15kg object? b. If the object is on the ground what is the normal force acting on the object c. ...
*June 21, 2011*

**physics**

That is just what my homework says but it probably does mean north of west.
*June 21, 2011*

**physics**

1. a force of 30n with a direction of 35 degrees northwest acts on point p. Find: a) the northward component on the force b) the westward component of the force Please show work. Thanks!
*June 21, 2011*

**Physics**

2. Tyler pulls a box full of baby ferrets across the floor by means of a rope that is tied to the box. The rope makes an angle of 41 degrees with the horizontal and tyler pulls on the rope with a force of 60N. a)What is the horizontal component of the force that tyler is ...
*June 21, 2011*

**Physics**

James and Steve have a contest to see who can kick a football further. James kicks the football at an angle up of 57 degrees, and a speed of 75m/s. Steve kicks the ball with a speed of 100m/s, at an angle up of 48 degrees? Who wins the contest? Please show what each variable ...
*June 21, 2011*

**maths**

calculate the surface area of the following prism cuboid; 2cm 6cm 4cm what is the surface area of the cuboid
*May 21, 2011*

**maths**

calculate the surface area of the following prism cuboid; scm 6cm 4cm what is the surface area of the cuboid
*May 21, 2011*

**maths**

a prism has a cross sectional area of 8mm2 and a volume of 224mm3 calculate the length of the prism thank you so much for your help
*May 21, 2011*

**maths**

so the cube number is 3????
*May 21, 2011*

**maths**

3 x 3 x 3 = 27 27 is a cube number
*May 21, 2011*

**maths**

a cube has a volume of 27cm3 what is the length of one side of the cube
*May 21, 2011*

**geometry**

Find the length of segment AG in the figure if the prism is 8 ft by 9 ft by 12 ft.
*May 18, 2011*

**math urgent!!!!!!!!**

you have to isolate the x or the y. So move the 5x to the other side by subtraction,-4y=8-5x, then divide each part by -4, -4y/-4=(8/-4)-(5x/-4). Gives you y=-2+5/4x. Now plug that y into the original equation. 5x-4(-2+5/4x)=8... then once you get x plug that into the original...
*May 9, 2011*

**English**

I want to write a causal argument on how kids get hooked on unhealthy/processed foods (at home-- fast foods and at school-- vending machine and cafeteria hot lunches). I'm not quite sure what exactly to write about throughout a causal argument paper on this claim. What ...
*May 9, 2011*

**Abstract Algebra**

Let ø: G--> G' be a homomorphism from the group G to the group G'. Prove that ø(a)= ø(b) if and only if ab^-1 exists in Ker(ø).
*May 6, 2011*

**History **

The revolt in Hungary (1956), the demonstrations in Czechoslovakia(1968), and the formation of Solidarity in Poland (1980's) are similar in that they
*May 1, 2011*

**s.s (social studies) **

IS THIS RIGHT ? There comes a time in history,when the Americans must break away from england and become a separate nation , equal with other nations like god planned all along.We care about what the rest of the world thinks,therefore we will clarify why we are motivated to ...
*April 26, 2011*

**s.s (social studies) **

i dont get it
*April 26, 2011*

**s.s (social studies) **

can you help me translate the declaration of independence? first passage: When in the course of human events it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate ...
*April 26, 2011*

**Chemistry**

So basically for the first 3 answers (Part (A)(B)(C)): (A)and(B) - the concentrations would be equal since the mole ratio is equal and Q = K at equilibrium. (C) - the rate of both reactions would be equal also, as Q = k, right? (D)(1) - If the volume is increased at constant ...
*April 25, 2011*

**Chemistry**

PCl5 --> PCl3 + Cl2 (Kp = 630 at 546 K) A system is prepared by placing equimolar amounts of the three gases shown in the equation above in a suitable rigid container held at constant volume. Equilibrium is established at 546 K. (A) When equilibrium is established, how does...
*April 25, 2011*

**Life orientation**

Severally improve the worlds environmental problems,on the other hand,if the current way the worlds environmental problem is bing handled.
*April 8, 2011*

**Math**

Complete the square for this conic section in standard form: x^2+y^2-6x+4y-12=0
*April 3, 2011*

**science**

what kind of heat transfer causes earth's major wind patterns
*March 15, 2011*

**CALCULUS**

hi what is the derivativ of [-18(x^2)]/[(1+2(X^3))^2] ?? thanks!~
*March 10, 2011*

**Physics**

On a cold winter morning, a child sits on a sled resting on smooth ice. When the 9.20 kg sled is pulled with a horizontal force of 40.0 N, it begins to move with an acceleration of 2.50 m/s^2. The 23.0 kg child accelerates too, but with a smaller acceleration than that of the ...
*March 3, 2011*

**Abstract Algebra**

Let A= -{-1}, that is, the set of all real numbers except -1. Define an operation on A by a*b=a+b+ab (usual addition and multiplication in R) a) Show that * is closed on A b) show that * is associative c) Find the identity element for * and verify that it is the identity d) ...
*February 22, 2011*

**COLLEGE ALGEBRA**

Suppose that R is the set of real numbers. Let f: R--> R be defined by f(x)= mx+b, where m and b are real numbers and m is nonzero. Prove that f is a bijection.
*February 22, 2011*

**Math**

Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?
*February 15, 2011*

**US History**

How did Hitler respond to Germany’s obligations under the Treaty of Versailles when he became Germany’s leader?
*February 10, 2011*

**Abstract Algebra**

Let f:A->B where A and B are nonempty. Prove that f(S1 U S2) = f(S1) U f(S2)
*February 5, 2011*

**Algebra**

The slope formula is Y2-Y1/X2-X1. So it would be 1-2/2+2 which equals -1/4
*February 5, 2011*

**childcare**

OMG u guys aren't helping I'm gonna save all my answers and post them when I'm done
*February 1, 2011*

**science**

what do you want to know?
*January 31, 2011*

**geometry**

If the perimeter of a particular square is 2011 inches, what is the area of the square, in square inches? Express your answer in decimal form to the nearest hundredth.
*January 25, 2011*

**College Algebra**

Al gives 1/2 of his marbles to bev. bev gives 1/3 of these to carl. carl gives 1/4 of these to dani. If dani was given four marbles, how many did al have originally?
*January 23, 2011*

**algebra**

Nicole can jog to work in of an hour. When she rides her bike, it takes her of an hour. If she rides miles per hour faster than she jogs, how far away is her work? NEED HELP FAST
*January 21, 2011*

**Math**

After a recent series of home improvements, four couples were having a dinner party to discuss the additions to their homes. Mike had not recently had a new bathroom. Lorraine had not yet done her kitchen, but perhaps would update it next. Chris, who is married to Renée...
*January 16, 2011*

**algebra**

-13=3(x+2)-10
*January 13, 2011*

**Chem**

I don't understand what h is
*January 13, 2011*

**Chem**

What is the energy (e) of electromagnetic radiation having a frequency of 6.32 x 10^20 s^-1?
*January 13, 2011*

**adult education**

use lattice multiplication to find the prduct of 124 x 56
*December 16, 2010*

**accounting**

please help now!!!!!
*December 10, 2010*

**accounting**

This is the question: "Use page 3 of the journal. Jornalize and post the adjusting entries." Can you tell me how to do that?
*December 10, 2010*

**science**

ive been trying to find a report for 5th grade greenhouse effect science. how can i type it to find it?
*December 9, 2010*

**English(how is it?)**

Ya you do this by eating some bananas, there ya go
*December 1, 2010*

**Math**

period = 2ð/(ð/12) = 24 months amplitude = 4000 vertical displacement = 20 000
*December 1, 2010*

**Math**

The population size, P, of owls (predators) in a certain region can be modelled by the function P(t) = 1000 + 100 sin (3.14t/12), where t represents the time in months. The population size, p, of mice (prey) in the same region is given by p(t) = 20 000 + 4000 cos (3.14t/12). ...
*December 1, 2010*

**PHYSICS!!!**

By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?
*December 1, 2010*

**PYSCIS!!!!**

By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?
*December 1, 2010*

**Geometry**

I saw it after I typed in my response to avery. Thank you very much :)
*November 22, 2010*

**Geometry**

Could you please explain why the answer is no?
*November 22, 2010*

**Geometry**

Is it possible for a triangle to have sides with the following lengths: 5, 9, 15?
*November 22, 2010*

**college physics**

A mass of 1 kg is hanging from a spring with a spring constant of 3 N/m. At a distance of 0.2 m below the equilibrium it has a velocity of 1 m/s in the upward direction. What is the amplitude of the oscillation?
*November 21, 2010*

**College Chemistry**

Calculate the vapor pressure of a solution of 0.39 mol of cholesterol in 5.4 mol of toluene at 32oC. Pure toluene has a vapor pressure of 41 torr at 32oC.
*November 19, 2010*

**College Chemistry**

How much ice can be melted at 0oC by the condensation of 1.0 kg of steam at 100.oC? (ΔHfus of ice = 6.01 kJ/mol; ΔHvap of water = 40.7 kJ/mol)
*November 19, 2010*

**Math**

Four balls are simultaneously picked at random from a jar containing 2 red balls, 2 green balls, and 6 yellow balls. What is the probability that exactly two of the selected balls will be red?
*November 15, 2010*

**math**

To find the amount of the discount, you multiply the price by the percentage out of 100. So, 35x.25=8.75 This is the same as (X/35) x (25/100) So you are getting 8.75 off. And the price you pay is.. 35-8.75 = $26.25
*November 15, 2010*

**chemistry**

What reagent would allow you to distinguish between FeCl3 and PbCl2? (As if using an analysis scheme)
*November 15, 2010*

**Chemistry**

What reagent would allow you to distinguish between BaS and NiSO4? (As if using an analysis scheme)
*November 15, 2010*

**Chemistry**

What reagent would allow you to distinguish between AgNO3 and MNSO4? (As if using an analysis scheme)
*November 15, 2010*

**Chemistry**

What reagent would allow you to distinguish between AgNO3 and MNSO4? (As if using an analysis scheme)
*November 15, 2010*

**CHEM**

What reactions does Br- have, ones that would distinguish it as a anion? As in a anion analysis scheme?
*November 15, 2010*

**Chem**

Why is BaSO4 insoluble in HNO3?
*November 15, 2010*

**6th grade**

What is the volume of a chest that is 20 inches by 10 inches by seven and one tenth inches?
*November 8, 2010*

**Physics Help!!! **

With the energy needed to warm up some amount of water from 26°C to 44°C, how high could you lift it?
*November 8, 2010*

**Physics Help!!! solids and fluids**

During a transatlantic flight, you drink a bottle of water and tightly close its lid again. Back on the ground during taxiing to the terminal, you notice that the thin plastic bottle is crushed, and you eyeball it to be only about 80 percent of its original volume (the photo ...
*November 8, 2010*

**Chemistry**

How can you determine which of any two halogens is more active?
*November 7, 2010*

**Spanish 1**

B and C
*November 7, 2010*

**Physics HELP!!! potential energy**

Two identical metal plates with small holes are aligned a distance L=6.7 cm apart. They have a potential difference of 131 Volts. An electron can enter through the hole in the negative plate and exit through the hole in the positive plate. If it enters with a velocity of 3290 ...
*November 3, 2010*

**Physics HELP!!! Potentials and Fields**

Two identical metal plates with small holes are aligned a distance L=6.7 cm apart. They have a potential difference of 131 Volts. An electron can enter through the hole in the negative plate and exit through the hole in the positive plate. If it enters with a velocity of 3290 ...
*November 1, 2010*

**Physics HELP!!!**

A car (mass 920 kg) drives up a hill (height 328 m) in 143 seconds. At the bottom of the hill, it has a speed of 24 m/s, but at the top, it has slowed down to 14 m/s. Neglecting friction, what is the average engine power
*October 31, 2010*

**Physics HELP!!!**

A car (mass 920 kg) drives up a hill (height 328 m) in 143 seconds. At the bottom of the hill, it has a speed of 24 m/s, but at the top, it has slowed down to 14 m/s. Neglecting friction, what is the average engine power
*October 31, 2010*

**Physics**

So would it be 1/2*2.6^2/30
*October 29, 2010*

**Physics**

A flywheel has a moment of inertia of 2.6 kg·m2. What is the average power needed to spin it up from rest to an angular velocity of 100 rad/s in 30 seconds?
*October 29, 2010*

**physics:energy**

Okay I got it thanks for the help.
*October 27, 2010*

**physics:energy**

watts wouldn't be the units correct. My answer is 1456.785
*October 27, 2010*

**physics:energy**

How much power is needed to push a box (mass 27 kg) over a surface (coefficient of friction μk=0.5) with a velocity of 1.1 m/s?
*October 27, 2010*

**Physics: energy**

Thank you
*October 27, 2010*

**Chemistry**

How is the solubility of a solid affected by temperature?
*October 26, 2010*

**math**

Let C(q) represent the cost, R(q) the revenue, and π(q) the total profit, in dollars, of producing q items. a) If C′(67) = 65 and R′(67) = 86, approximately how much profit is earned by item number 68? b) If C′(149) = 120 and R′(149) = 98, ...
*October 8, 2010*

**physics**

thanks, i got them all except for the first one.
*October 4, 2010*

**physics**

true or false If a net force acts on an object, the object's speed will change. An object's velocity will change if a net force acts on the object. If two object have the same acceleration, they are under the influence of equal forces. The net force which acts on an ...
*October 4, 2010*

**English I**

What is feild or Scope? I am writing a book report on Lord of the Fies by William Golding.
*September 28, 2010*

**5th grade math**

16-(3x2)x2 16-(6) x2 16-(12) 4 4is the answer and in middle school when u have parensis u dont need to put an x before the nest multipliction number it means times already
*September 28, 2010*

**8th grade**

$1 for every 4 oz 12/4
*September 26, 2010*

**3rd grade**

they don't really learn algebra they just have a box where a middle or high school student would have a variable
*September 22, 2010*