Monday

January 16, 2017
Total # Posts: 143

**Physics**

We have a heat engine that produces 150 J of heat, does 40 J of work, and emits 110 J into another system. What is the efficiency of the heat engine? Please don't give me the answer! Just help figure out how to find it! The description for the lesson with this question was...

*December 5, 2016*

**Calculus**

Alright thank you so much Steve.

*November 9, 2016*

**Calculus**

Given 4?8 (4 on top, 8 on bottom) f(x)dx= 12 and 4?8 g(x)dx= 5. Evaluate the following: 4?8 [2f(x)-3g(x)]dx Would I just put 12 in for f(c) and 5 in for g(x) then solve?

*November 9, 2016*

**calc**

Thank you so much. What would the sketched regions look like??

*November 9, 2016*

**calc**

4?1 4 on the top and 1 on the bottom of that sign 6?-2 same deal

*November 9, 2016*

**calc**

Sketch the regions represented by the following integrals and evaluate them using geometric formulas. 4 integral 1: 2x+3dx 6 integral -2: lx-1l dx (absolute value of x-1

*November 9, 2016*

**SS**

WOW"thanks"

*October 14, 2016*

**SS**

Ms.Sue Please just tell me....I'm not going to past because of you...

*October 14, 2016*

**SS**

how did the Aztec become so powerful

*October 14, 2016*

**the tail**

which statement from the tail is he best example of indirect characterization

*October 13, 2016*

**HEALTH**

do you think there is big difference in the number of deaths caused by disease and those not caused by disease.

*October 5, 2016*

**SS**

Ming Moved to toronto 10 years ago when he was three. He still Speaks Chinese but has learned english and some french. he celebrates both chinesse and canadaian holidays.ming best reflects that canada is a____________.

*September 18, 2016*

**SS**

MS .Sue I have look I can not find them

*September 17, 2016*

**SS**

Ms.Sue...anyone...HElp

*September 17, 2016*

**SS**

I Can't find them/they are not in my text book and nor are they in my Lesoon.=^_^=

*September 17, 2016*

**SS**

How is unity and division a theme in Canadian history? How did distinct English and French populations form in Canada? What is the relationship between natural resources and European settlement? How is conflict and compromise a theme in Canadian history? How did distinct ...

*September 17, 2016*

**SS**

Yes, I can not Find It anywhere

*September 16, 2016*

**SS**

Id didn't Find anything

*September 16, 2016*

**SS**

who are the first nations...Canada

*September 16, 2016*

**Science**

in a homes central heating system when the room temperature measured by the thermostat reaches a set value the thermostat sends a message to the heater and the heater switches off These action are an examples of a

*September 14, 2016*

**SS ICY NORTH**

What do mean?????

*September 12, 2016*

**SS ICY NORTH**

I did I can't find anything

*September 12, 2016*

**SS ICY NORTH**

HELP I NEED A TO READ ON ICY NORTH WHAT DO I READ

*September 12, 2016*

**Math**

6 shelves

*September 6, 2016*

**physics**

A rifle is shot with 30.0m for distance and hit's a target at 1.90cm as a height. What is the flight time? What is the velocity of the shot?

*May 19, 2016*

**science**

A man shots a rifle with 30.m and hit's an object at 1.90cm. What is the flight time? What is the velocity of the shot? 1.90=.19m

*May 19, 2016*

**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*