Thursday

April 24, 2014

April 24, 2014

Total # Posts: 1,663

**Physics**

What average force is required to stop an 1600 -kg car in 8.0 s if the car is traveling at 80 km/h?

**physics**

What force is needed to accelerate a child on a sled (total mass = 65.0 kg) at 1.75 m/s^2

**2nd grade**

If the number is less than 70 and greater than 60, the tens digit has to be 6. Now, if the ones digit is half the tens digit, divide 6 in half. The answer is 63.

**4th grade**

parallelogram or square

**Pre-calc**

The question is solve for cosx= 0.60 on the interval [0,2pi). The answer is to be posted in radians. I don't understand how to find the answer.

**Chemistry**

The specific heat of toluene (C7H8), is 1.13 J/g•K. How many kJ of heat are necessary to raise the temperature of 61.0 g of toluene from 15.0 °C to 37.2 °C?

**earth**

A helicopter is ascending vertically with a speed of 4.00 m/s. At a height of 185 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?

**7th grade**

i don't kow how to sole this equation 5x-10=2x-7 can u help me

**Chemistry**

calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=7 to n=1. Is it just 6? or how do I do this?

**Physics**

A shotputter throws the shot with an initial speed of 15.6 m/s at a 38.0 angle to the horizontal. Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.15 m above the ground.

**Physics**

A tiger leaps horizontally from a 5.8m -high rock with a speed of 3.6 m/s. How far from the base of the rock will she land?

**Physics**

A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. The hieght of the cliff is 33 m. My question is: How far from its base did the diver hit the water?

**physics**

A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. How high was the cliff?

**chemistry**

what is the mass of 1.22x10^23 molcules of carbon dioxide(co2) and silicon dioxide(Sio2)?

**chemistry**

44 g/mol

**chemistry**

what is the mass of 1 mole of carbon dioxide (CO2), and silicon dioxide (SIO2)?

**physics**

A ball is thrown upward from the ground with an initial speed of 26.2 m/s; at the same instant a ball is dropped from rest from a building 14 m high. After how long will the balls be at the same height?

**science**

_____ contain a fuel, rods to control nuclear reactions, and a cooling system. Would Nuclear reactor work??

**General Chemistry**

A certain protein was found to have 0.855% zinc by mass. Determine the minimum molecular mass of the protein. How do I go about solving this?

**physics**

A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.3 later. If the speed of sound is 340 , how high is the cliff?

**Geometry**

Find the requested angle. The supplement of 135°.

**Geometry**

Glenda wants to glue glitter over a piece of felt shaped like a parallelogram with a height of 36 in. and a base of 46 in. If the glitter costs $1.20 per ft2 to cover the felt, how much will it cost to cover the felt? A) $55.20 B) $1987.2 C) $165.60 D) $13.80

**algebra **

CORRECTION LIST THE ELMENETS OF A AND B NOT A UNION B

**algebra **

if A= {xlx is odd} amd B={xlx>7} list the elements of A union B

**math**

7(3x+6)=11-(x+2)

**English**

I had to write five sentences in which I used 5 different tenses. Here is what I wrote: Education helps financial planning by giving basic skills needed for better jobs and higher wages. (Present) Education will help financial planning by giving basic skills needed for better ...

**math**

what's the expression for 6p-16 if p=3?

**business ethics**

How do most U.S manufacturers montor their factories for compilance with corporate codes of conduct? a. by applying an internal audit system b. by using the services of an independent NGO c. by hiring the for-profit services of a consulting or audit firm d. by inviting a gover...

**College physics**

What is the effect of inserting a ferromagnet inside a winding coil where current flows? The effect is to Fill in the Blank 01 (increase/decrease) the magnetic field inside the coil compared to the field that would have been produced in free space. This also Fill in the Blank ...

**College physics**

According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true? 1. There is no force on the magnet. All forces act on the wire to keep the ...

**English?**

In the book Andromeda Strain, where is Vandenberg Air Force Base located?

**algebra**

27 5/3 divided by 21 1/3 The answer sheet said 81. How do you get this?

**College physics**

A toy car has a mass of 120g, including two 1.5 V batteries connected in series. Suppose the motor that drives the car is 80\% efficient (i.e., 80\% of the electric energy goes to the drive wheels, 20\% is dissipated as heat) and that friction and air resistance are negligible...

**college physics **

An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.3×10^7 m/s. What was the electron's speed as it left the negative plate? the voltage is 650V and the charge of q1 is 1.7*10^-9 and the charge of q2 is -1.7*10^-9

**Chemistry**

Many analytical instruments require liquid nitrogen. While filling an instrument with liquid nitrogen, an analytical chemist slips and spills the contents of the dewer, 29.0 L, onto the floor. Since the boiling point of liquid nitrogen at 1.00 atm is 77.4 K, all the nitrogen b...

**Chemistry UPDATED QUESTION**

A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm? Gases to solve for: N2, O2, CO2, and Ar

**Chemistry**

I'm sorry, that should read 78.08% nitrogen

**Chemistry**

A sample of air contains 78.8% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm?

**physics**

Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 500 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s). I have the answer but I just don't know how to get...

**Physics**

The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm? The answer is 15.7 m/s but I don't understand how to get...

**business ethics**

how do most US manufacturers monitor their factories for compliance with corportate codes of conduct?

**english**

what are the metaphors used in old ironsides poem

**freshman english**

What are some rhetorical methods of developing a topic?

**Physics**

What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?

**Physics**

At what speed will a car round a 52-m-radius curve, banked at a 45 degree angle, if no friction is required between the road and tires to prevent the car from slipping? (g=9.8m/s^2)

**College Physics**

A point on a rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s^2. What is the angular speed of a point 0.075 m from the center of the disk?

**Physics**

A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2m from the pivot causing a CCW torque, and a force of 5.2N is applied at the end of the rod 3.0m from the pivot. the 5.2N is at an angle of 30 degrees to the rod...

**wgu**

How did the moon landing help to change the way scientists understand an aspect of the natural world.

**english 3**

In olaudah equiano's "The Middle passage" what was his greatest fear when he boarded the ship

**english 3**

is fear an emotion

**english 3**

name two emotions Paine appeals to in his essay The Crisis

**english**

i have to write a declaration of independance what key words or [hrases should i use.

**Calculus**

Thank you! :)

**Calculus**

Differentiate: F(x)=e^(xsin2x) This isn't homework, it's review for our exam. Couldn't remember how to work it :( Thanks!

**accounting**

At the end of April, ABC company had a balance of $37,910 in vacations benefits payable account. During May, employers earned an additional $2,790 in vacation benefits, but some employee used vacation days amounting to $2,050 of vacation benefits.. The $2,050 was charged to Wa...

**physics**

Why can’t you take a photograph of your image in a plane mirror and focus the camera on both your image and on the mirror frame?

**Physics**

Please Help! In our everyday environment, diffraction is much more evident for sound waves than for light waves. Why is this true?

**poetry**

Can u please explain to me the poem On the wire by Robert service in detail?

**math**

what is 135/180 as a grade

**Courts**

Write a 1,100- to 1,400-word paper in APA format comparing the entertainment fiction of the court system with its reality. · Select examples from fictional portrayals of the courtroom found in books, movies, or television; for example, The Runaway Jury, A Few Good Men,...

**photo**

What are the definitions to principals of design in photography?

**Chemistry**

2.91L

**English **

Write a sentence that matches the form provided in the description (Sentence with compound subject and action verb.) My Sentence is : The lizard and the cat jumped on the mouse. Now i need a second sentence to match my first sentence (Sentence with a proper noun and a linking ...

**Math**

the fatio is 12/38

**Physics**

A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is horizontal, as shown in the fig...

**Physics **

For B left side has m1 Right side has m2 picture looks like this ---------------------------------- I T= 637 I mb= 10kg I ------------------ ---------- <------x----------> I I I I I I m1 m2 ------------L=3m-------------

**Physics **

A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is horizontal, as shown in the fig...

**math**

A share of common stock has just paid a dividend of $2.00. If the expected long-run growth rate for this stock is 7%, and if investors require an 11% rate of return, what is the price of the stock?

**5th grade**

adVERB is for VERBS ajective is nouns

**US**

In 1938 Mexico nationalized America's oil, according to my textbook. What does this mean? I don't get what exactly they did.

**Chem**

I'm still not getting the correct answer: i have 2.00g/180.15g/mol =1.11*10^-2 1.11*10^-2/.6=1.85*10^-3 and (2.4_10^-3)^2/1.85*10^-3 = 3.11*10^-9. what am i doing wrong?

**Chem**

Aspirin (acetylsalicylic acid, ) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 L of water and measured the pH . What was the Ka value calculated by the student if the of the pH of the solution was 2.62? I...

**chem**

Thank you for your help! That website did clarify things a bit. Thanks again!

**chem**

classify each of the following as a lewis acid or base: Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.

**College Chemistry**

Given the following equilibrium constants, Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium constant for the reaction below at 25*C. NH4^+(aq)+NO2^-(aq)f HNO2(aq)+NH3(aq)

**College Chemistry**

pH=pKa + log(base/acid) 3.95=3.465 + log(base/acid) .494=log(base/acid) 10^.494 3.1

**College Chemistry**

Never mind, I figured it out.

**College Chemistry**

Calculate the ratio of NaF to HF required to create a buffer with pH=3.95. Also, can you please explain in a nutshell the whole concept of buffers? Thanks!

**world issues**

which countries give money or military support to Syria?

**Chem**

Consider this reaction: CO (g) + H2O (g0 <---> CO2(g)+H2(g) kc=102 at 500 K A reaction mixture initially contains 0.145 M of CO and 0.145 M of H20. What would be the equilibrium concentration of [CO]? I so far have kc= [H2][CO2]/[CO][H2O]= 102 I know i have to set up an ...

**Algebra**

Use a graphing calculator, it would be super easier dude.

**Math**

Find the vertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?

**Math**

Find th evertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?

**Chemistry**

sorry i did not mean to submit this question multiple times, my internet connection is low and i didn't think it went through. i apologize.

**Chemistry**

Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...

**Chemistry**

Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...

**Chemistry**

Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have to make modifications according to the stoichiometric coeffecients. So do I divide k1 by 2...

**algebra**

Evaluate whether a prepaid or monthly cell phone plan is most effective for a customer that uses x weekday minutes per month. I can make up my own numbers for each plan. Having problems making up the equations.

**spanish**

In Spain, all hotels are new and modern buildings? True or false.

**College Math **

Find the exact value of: sin [2sin^-1 (-sq rt (3)/2)] how do i answer this question? i don't know how to find the answer.

**college math**

The range can be found by plugging the values of the domain in the equation. For example, 3/(-3-6)=-1/3 -1/3 is part of the range because the range represents the outputs or y values that correspond to the inputs (the domain), or x values

**Trig**

How do I solve the following? sec 3 theta/2 = 2 on the interval 0<theta<2 pi? I tried to look in my textbook but it doesn't have an example. I also tried google and I was unsuccessful> How do I do this question? I know that the period for sec is 2 pi but I don'...

**Chemistry**

For a reversible reaction where A + B (both arrows) C + D, the equilibrium constant is represented by kc = 5.3 = (c)(d)/(A)[B]. Initially A and B are present at 2.00 M each. What is the final concentration of A once equilibrium is reached. I made an ICE table and came up with ...

**Chemistry**

thanks, i double checked and everything looks right. i'm going with answer d. thank you again!

**Chemistry**

2H2 (g) + O2 (g) <---> 2H2O (g) what is the likely magnitude of the equilibrium constant? a) k < 10 ^-3 b) 10^-3<K<10^3 c)k=0 d)k>10^3 i know that choice c is incorrect because if k=o there would be no need to calculate equilibrium, but how would i go about n...

**College Chem II**

Determine the [H3O+] of a 0.160M solution of benzoic acid.

**College Chemistry**

THANK YOU!

**College Chemistry**

Thanks for your help! I understand number 2, but I still don't get number 1. Is there any other way to explain it?

**College Chemistry**

What is the pH of the following solutions? 1)a solution that is 5.4×10−2 M in HClO4 and 3.0×10−2 M in HCl 2)a solution that is 1.80% HCl by mass (Assume a density of 1.01g/mL for the solution.) Please help! I am so confused!

**CHEMISTRY**

Is non-dairy creamer a colloidal dispersion

Pages: <<Prev | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | **11** | 12 | 13 | 14 | 15 | 16 | 17 | Next>>