Friday

January 30, 2015

January 30, 2015

Total # Posts: 88

**chemsitry**

How many grams of propane (C3 H8 ) will react with 3.29 L of O at 1.05 atm and -34°C? i know the balanced eqn is 1C3H8 + 5 O2 -----> 3CO2 + 4H20 and that PV=nrt , with T= -34 + 273.15 = 239.15K. n=(PV)/(RT) (F=for O2). = 0.176 mol O2 0.176 mol O2 * (1mol C3H8 / 5mol O2...
*October 23, 2014*

**Science**

A rod of length L=1.80m is mounted to a wheel (solid cylinder) of radius R=8.00cm. A massless rope is wound on the wheel, and then connects to a block of mass m=0.250kg. The mass is released from rest and allowed to fall. 1. Find the tension in the rope. 2. How long does it ...
*June 16, 2014*

**physics**

Holes move in the direction opposite to that of the applied field.
*October 7, 2013*

**GEOMETRY **

A 4x7 rectangle can be rotated about the long side to generate a cylinder. It also can be rotated about the short side to generate a cylinder. Find the lateral area and surface area of the 2 cylinders . PLEASE HOW. TELL ME
*July 21, 2013*

**Physics Need quick help please**

Thanks Elena :) I really appreciate your help!
*May 8, 2013*

**Physics Need quick help please**

Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks Physics...
*May 8, 2013*

**Physics to Elena**

Thatz what I got too but itz still wrong :/ I don't know why please help me...thanks
*May 8, 2013*

**Physics to Elena **

Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks Physics...
*May 8, 2013*

**Physics!**

The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :)
*May 8, 2013*

**Physics please help me out! thank you**

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you
*May 8, 2013*

**Physics**

Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks
*May 7, 2013*

**Physics Need help please**

An ancient wooden club is found that contains 270g of carbon and has an activity of 8.3 decays per second. Determine its age assuming that in living trees the ratio of 14C/12C atoms is about 1.3x10^-12? t= in years
*May 7, 2013*

**Physics**

The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :)
*May 7, 2013*

**Physics Help me Someone plz**

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you Physics Plz help me - Anon, Monday, May 6, 2013 at 9:17pm 5.98x10^6 Thatz still wrong Physics...
*May 7, 2013*

**Physics Plz help me**

ya Anon thanks but that is wrong too and bobpursley I am having a hard time figuring this out could you help plz.
*May 7, 2013*

**Physics Plz help me**

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you Physics Plz help me - Anon, Monday, May 6, 2013 at 9:17pm 5.98x10^6 Thatz still wrong
*May 7, 2013*

**Physics Plz help me**

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you
*May 6, 2013*

**Physics**

-Estimate the total binding energy for copper? in MeV -Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons? E= in Joulea Please help me I am confused...thanks
*May 6, 2013*

**Physics Plz help me**

The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :)
*May 6, 2013*

**Physics Plz help me**

The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :)
*May 6, 2013*

**Physics**

What is the smallest possible value for the angular momentum L of an electron in the n=5 shell? Lmin= 0 kg*m^2/s What is the largest possible value for the angular momentum L of an electron in the n=5 shell? What is the Lmax? Please help I don't get this.Thank you!
*April 30, 2013*

**Physics Need help plz**

An 1900 kg car is traveling with a speed of (22 +- .22) m/s. With what maximum accuracy can its position be determined? delta x= in meters Can someone please help me out I am lost on this on...Thank you
*April 30, 2013*

**Physics Need help plz**

An 1900 kg car is traveling with a speed of (22 +- .22) m/s. With what maximum accuracy can its position be determined? delta x= in meters Can someone please help me out I am lost on this on...Thank you
*April 29, 2013*

**math**

In a problem on percentages there are three quantities that are involved. These are the base, the amount, and the rate percent. Express the relation between them in the form of an equation and explain with examples how to find each one of them given the other two quantities.
*June 22, 2012*

**Physics**

When the space shuttle (mass of the shuttle = 2 x10^6 kg) was at the outer limit of Earth's atmosphere (distance = 350 km above Earth's surface), astronauts measured the gravitational force from Earth to be equal to 1.7 x 10^7 newtons. Assuming that both Earth and the ...
*May 20, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.725K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space?
*April 24, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.725K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space?
*April 24, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 24, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 24, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 24, 2012*

**Astronomy**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Physics**

Thank you for all your help!! Could you please help me with this question?
*April 23, 2012*

**Physics**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Physics**

If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
*April 23, 2012*

**Astronomy**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Astronomy**

If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
*April 23, 2012*

**Astronomy**

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?
*April 23, 2012*

**Astronomy**

If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
*April 23, 2012*

**DrBob222 PLEASE HELP!**

never mind I subtracted wrong the answer is -235.4 hahaha
*March 17, 2012*

**DrBob222 PLEASE HELP!**

The values above are in the units of kJ/mol
*March 17, 2012*

**DrBob222 PLEASE HELP!**

************The values I used C(graphite): change in delta Hf=0 change in delta G= 0 change in delta S= 5.7 Cl2 change in delta Hf=0 change in delta G= 0 change in delta S= 223.1 CCl4 change in delta Hf=-139 change in delta G= -68.6 change in delta S= 214.4
*March 17, 2012*

**DrBob222 PLEASE HELP!**

I posted this question already but you never replied back :( Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer...
*March 17, 2012*

**chemistry**

Change in Hf(kJ/mol) Change in G Change in S C(graphite) 0 0 5.7 Cl2 0 0 223.1 CCl4 -139 -68.6 214.4
*March 16, 2012*

**chemistry**

Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=-253.3J/mol*K deltaS(surr)=466.4 J/mol*K ...
*March 16, 2012*

**physics**

(largest) R_outer: .6m R_inner: .5m R_outer: .4m R_inner: .3m R_outer: .4m, R_outer: .2m R_inner: .2m , R_inner: .1m R_outer: .6m R_inner: .2m (smallest)
*August 8, 2011*

**Math**

You are ﬁ ve feet tall and cast a seven-foot eight-inch shadow. At the same time, a basketball hoop casts a 19-foot shadow. How tall is the basketball hoop? Assume the triangles are similar.
*April 6, 2011*

**social studies**

who was the self made millionare from florida who started the door-to-door sale after the civil war???????? I NEED HELP!
*March 14, 2011*

**math**

The gas tank in Micheal's car can hold 18.0 gallons. If the tank currently contains 5.5 gallons, what fraction of the tank is full?
*February 16, 2011*

**projectile motion**

You have a boat with a motor that propels it at vboat = 4.5 m/s relative to the water. You point it directly across the river and find that when you reach the other side, you have traveled a total distance of 27 m (indicated by the dotted line in the diagram) and wound up 14 m...
*November 14, 2010*

**projectile motion**

A home run just clears a fence 105 m from home plate. The fence is 4.00 m higher than the height at which the batter struck the ball, and the ball left the bat at a 31.0° angle above the horizontal. At what speed did the ball leave the bat
*November 14, 2010*

**projectile motion**

You fire a squirt gun horizontally from an open window in a multistory building and make note of where the spray hits the ground. Then you walk up to a window 5.0 m higher and fire the squirt gun again, discovering that the water goes 1.5 times as far. Ignore air resistance. ...
*November 14, 2010*

**physics**

A juggler throws a ball from height of 0.950 m with a vertical velocity of +5.50 m/s and misses it on the way down. What is its velocity when it hits the ground?
*November 14, 2010*

**6th grade english**

it is present
*November 14, 2010*

**PHYSICS ---HELP!**

how would I show that in m/s?
*October 6, 2010*

**PHYSICS ---HELP!**

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?
*October 6, 2010*

**PHYSICS ---HELP!**

Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*October 6, 2010*

**SETS AND COUNTING**

In a survey of 289 college students, it is found that 65 like Brussels sprouts, 93 like broccoli, 55 like cauliflower, 28 like both Brussels sprouts and broccoli, 24 like both Brussels sprouts and cauliflower, 20 like both broccoli and cauliflower, and 13 of the students like...
*October 4, 2010*

**MATH SETS AND COUNTING**

There are a total of 103 foreign language students in a high school where they offer only Spanish, French, and German. You are given the following details for this semester: 44 take Spanish. 44 take French. 42 take German. 7 take Spanish and French but not German. 5 take ...
*October 4, 2010*

**MATH**

Find the monthly payments for an ordinary annuity that will yield a future value of $122000 at % interest for 22 years. payment
*September 22, 2010*

**chemistry**

[Cu(NH3)4]2+ + SO4(aq)2 + H2O [Cu(NH3)4]SO4•1H2O What is the theoretical yield of the products?
*September 14, 2010*

**alg. II**

Graph and state domain and range: f(x)=[x] (greatest integer function)
*July 5, 2010*

**Math**

katie is going to adopt kittens from a litter of 11. how many ways can she choose a group of 3 kittens?
*May 5, 2010*

**English**

It's an indefinite prounoun
*April 5, 2010*

**English Lit**

Thank you!!!
*April 2, 2010*

**English Lit**

I need help on proof reading this story. Christmas should be a time of celebrating the birth of Christ, but it seems like people make it more about themselves and what should they get for each other and who’s gift is more expensive or how we can compete when it comes to ...
*April 2, 2010*

**Algebra**

trains a and b are traveling in the same direction on parallel tracks. train a is traveling at 60 miles per hour and train b is traveling at 64 miles per hour. train a passes a station at 1:25 pm. if train b passes the same station at 1:55 pm, at what time will train b catch ...
*March 1, 2010*

**Algebra 1- 8th Grade**

Find each product. 1) 2t(t + 2) 2) (2n +1) * (n - 4)
*April 30, 2009*

**Algebra 1- 8th Grade**

According to the 1990 Census, the population of the United States was 2.49 x 10^8. The cost of taking the census in 1990 was 2.6 x 10^9 dollars. How much did the census cost per person in the United States?
*April 29, 2009*

**Physics**

for gamma radiation 1rad=1rem, but for alpha radiation 1 rad=20rem. Why is there a difference?
*January 14, 2009*

**Biology**

Describe two scientific theory (atomic,kinetic,cell theory) and non scientic (moral, ethical, religious theories ).Differentiate between the scientific and non scientific theories explaining why there are some questions that science cnnot answer.
*October 1, 2008*

**history**

thank-you! i thought i posted the article but it looks like i didnt...
*September 17, 2008*

**history**

can someone tell me what this article is about? just type it in google- I dont really understand it. What I got from it is that Mcain is sort of going back on what he said years ago but i dont really get it. McCain Embraces Regulation After Many Years of Opposition
*September 17, 2008*

**history**

can someone help me write a thesis statement about susan B. Anthony and her role for helping women. It needs to be something along the lines of: Without Anthon'y creation of..........would not have been possible or Susan Anthony made the greatest contribution to women'...
*September 4, 2008*

**math**

A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes and the return trip takes 15 minutes. What is the speed of the current?
*September 3, 2008*

**math**

A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes and the return trip takes 15 minutes. What is the speed of the current?
*September 3, 2008*

**math**

I DONT UNDERSTAND WHAT THE ANSWER WOULD BE....
*September 2, 2008*

**math**

Wendy is a loan officer and has 1,000,000 to lend and is required to get an average return of 18% per year. If she can lend at the rate of 19% or at the rate of 16%, how much can she lend at 16% rate and still meet the requirement?
*September 2, 2008*

**Economics**

Demand function for Zatab: Qd = 15.0 - 0.2P Production cost per unit: $5 Mirk Labs incurred a $60 million R&D cost 1) What wholesale price will Mirk Labs set? 2) How much Zatab will it produce and sell annually? 3) How much annual profit does the firm make on Zatab?
*March 10, 2008*

**Economics**

Demand function for Zatab: Qd = 15.0 - 0.2P Q = annual quantity demanded P = wholesale price of one Zatab unit Production cost per unit: $5 Mirk Lab incurred a $60 million R&D cost a decade ago 1: What wholesale price will Mirk Labs set? 2: How much Zatab will it produce and ...
*March 10, 2008*

**Economics**

Hello, I'm kind of struggling with this question. Can someone please help clarify this question. Since stock price beta tend to vary depending on the time frame analyzed, daily, weekly, and monthly. How do these factors influence or undermine the usefulness of beta as a ...
*March 9, 2008*

**physics**

A positive and a negative charge, each of magnitude 1.7 10-5 C, are separated by a distance of 11 cm. Find the force on each of the particles. what formula do i use?
*January 12, 2008*

**Math**

as in 5x5
*September 30, 2007*

**Math**

wat is 5 times 5?
*September 30, 2007*

**ETH125**

I'm having a hard time understanding the Checkpoint assignment on Legislation Legacy...Can anyone help me? Here is the question: Post a summar of a current issue between Native Americans and the federal government. Identify the legislation that you think is linked to the ...
*June 23, 2007*

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