Thursday
May 5, 2016

Posts by Leila

Total # Posts: 116

Math
170/69=x/2000
January 25, 2016

Chemistry
Name the element that has a density of 4.700 g/mL at STP
January 23, 2016

Language
D. or C.
January 22, 2016

Science 5
The path that energy & nutrients follow is an ecosytem is called an
January 22, 2016

physics
bc at the bottom of her swing (KE=GPE), which equals 584 J
January 12, 2016

physics
-at the bottom (max KE) -max KE = max GPE 1/2 (31.0) v^2 = 584 J v^2 = 37.67 v = 6.14 m/s -idk what the last question is
January 12, 2016

Physics
What are the units?
January 12, 2016

Physics
A 1 kg apple sits on a table. What is the normal force of the table acting on the apple?
January 12, 2016

math
x= 10.5 using either equation to find Y x + Y= 21 10.5 + Y=16 16-10.5 y= 5.50 check: x+y=21 10.5+5.50=16 x-y=5 10.5-5.50=5
January 4, 2016

math
For positive a, b, the potential energy, U, of a particle is given by U = b (a^2 over x^2 - a over x) for x is greater than 0 a) find the x-intercept b) find the asymptotes c)compute the local minimum d) sketch the graph I don't know how to start this problem Well first I...
October 29, 2015

math
Thank you so much for helping me understand how to solve the problem!
October 29, 2015

math
A smokestack deposits soot on the ground with a concentration inversely proportional to the square of the distance from the stack. With two smokestacks 20 miles apart, the concentration of the combined deposits on the line joining them, at a distance x from one stack, is given...
October 29, 2015

math
Thank you so much for helping me!
October 29, 2015

math
You run a small furniture business. You sign a deal with a customer to deliver up to 700 chairs, the exact number to be determined by the customer later. The price will be $150 per chair up to 600 chairs, and above 600 the price will be reduced by $0.25 per chair (on the whole...
October 29, 2015

math
Thank you so much for all your help! I will make sure I study really hard since it doesn't seem like I know much about this topic.
October 29, 2015

math
A rectangular beam is cut from a cylindrical log of radius 15 cm. The strength of a beam of width w and height h is proportional to wh^2. Find the width and height of the beam of maximum strength. (Round your answers to two decimal places.) h= ? w = ? Hello! I am struggling ...
October 29, 2015

HESI
Rick rides 11 1/8 miles in an hour with his bike in second gear going uphill. If Rick rides downhill in fourth gear he goes 2 1/2 times faster. How many miles will Rick go in an hour downhill in fourth gear?
June 2, 2015

chem
The allium family of vegetables, which include onion, leek, garlic and chives contain sulfur containing compounds. These chemicals are responsible for the vegetables' characteristic odour and properties. One such compound is allylmercaptan. 10.0 g of an onion extract was ...
April 29, 2015

Physics
A driver of a car going 90 km/h suddenly sees the lights of a barrier 40.0 m ahead. It takes the driver 0.75 s to apply the brakes, and the average acceleration during braking is -10 m/s2. (a) Compute for the total displacement of the car to determine whether the car hits the ...
March 4, 2015

MATH AGAIN~Ms. Sue
ms. sue are u a real techer
February 24, 2015

ELA
Oh my god thank you Ms. Sue your the best
February 23, 2015

ELA
in an article called " Buzz Off " by Kirsten Weir. I need help... 6. what are two consequences of spraying insecticides to get rid of mosquitoes? 7. how are the Oxitec mosquitoes different from the mosquitoes that Anthony James engineered?
February 23, 2015

Math/algebra
thank u so much mika
February 18, 2015

Math/algebra
9/55 8/62 5/37
February 18, 2015

astronomy
nearest galaxy
January 14, 2015

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

chem
-20.5
September 11, 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

algebra
2a+13-7 IDK
August 27, 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

1st grade
He drove past the dog
November 8, 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

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