Saturday

January 21, 2017
Total # Posts: 181

**Science**

Explain why n2h4 acts as bronsted lowry base but n20 does not

*November 6, 2016*

**check my work (american goverment)**

1 a 2 c 3 c

*October 31, 2016*

**Maths**

A swimming pool is being emptied and the amount of water remaining in the pool after t minutes after emoting commences is given by: Time t (min) Volume V (L) 0 30000 20 28800 40 25200 60 19200 80 10800 Find the equation describing the volume of water remaining at any time. [...

*October 30, 2016*

**Math**

A lawn is 3 m by 5 m there is a path 1 m wide laid around the lawn. Find the area of the lawn (Please help)

*October 15, 2016*

**homework help: social studies**

Why were colonial minutemen so prepared for the arrival of the British in Concord? (Worth 2 points) When Washington saw the British, he fired three cannon shots sending a warning sign Paul Revere had warned villages that the redcoats were coming The Green Mountain Boys hid in ...

*August 31, 2016*

**Pre Calculus**

Determine the quadrant in which a 130° angle lies. a. 4th quadrant b. 1st quadrant c. 3rd quadrant d. 2nd quadrant

*July 9, 2016*

**Pre Calculus**

Determine the quadrant in which an angle, θ, lies if θ = 5.40 radians. a. 4th quadrant b. 3rd quadrant c. 2nd quadrant d. 1st quadrant

*July 9, 2016*

**Pre Calculus**

Determine the quadrant in which an angle, θ, lies if θ = 8π / 7 a. 3rd quadrant b. 1st quadrant c. 4th quadrant d. 2nd quadrant

*July 9, 2016*

**math (significant digits)**

(3.x10^-2) + (0.2) round to significant digits required

*June 10, 2016*

**chemistry**

What is the difference between molecular compounds, covalent compounds and covalent bounds

*June 8, 2016*

**Calculus question ?**

Are there any horizontal asymptote on a ln natural log function

*May 17, 2016*

**LIMITS CALCULUS**

what about the cubic root what do we have to do with it ?

*May 17, 2016*

**LIMITS CALCULUS**

lim (cubic root (7+x^2-8x^3)/(x^3-x+pi)) x--> +inf I don't know how to take the limit when there is a cubic root around . Between the ansswer is + inf . I need direction

*May 17, 2016*

**maths**

the derivative of e^f(x)= e^f(x) . d/dx [f(x)] therefore y=e^sinx = e^sinx . cosx

*May 16, 2016*

**maths**

the derivative of e^f(x)= e^f(x) . d/dx [f(x)] therefore y'=e^3x.3 2) use chain rule y'=1/6(x^2)^-1/2 . 2x

*May 16, 2016*

**Math**

1 month = 4 weeks (18 x 15 ) x 4= 1080 $

*May 16, 2016*

**Physics**

Draw a free body diagram with the force of 20N and with Fn and with fg and then find the acceleration with newton second law . When you find the acceleration you can plug it into kinematics equation : vf=vi+at to find final velocity

*May 15, 2016*

**physics**

ki is the kinetic energy initial how much energy is there in the system in the form a speed at the beggining of the collision as you know there are two forms of mechanical energy ( kinetic energy and potential ) when the object is moving it has kinetic energy but when it ...

*May 15, 2016*

**physics**

linear momentum p=mv lets say m1 =0.1 kg m2=0.4kg before collision pi=(m1. u1)+(m2 . u2) pi=(0.1 . 100) + ( 0.4.50) = 30 when they collide together pf= (m1+m2)vf since linear momentum is always conserved pi=pf pf= (m1+m2)vf =pf (0.1+0.4) vf = 30 vf=60m/s you are correct b) ...

*May 15, 2016*

**calculus question ?**

I just can't wrap my head around this. I don't know if this is true I just came to conclusion with this if the limit of x--> +/-inf = L (if the limit of x going to pos/neg infinity gives you a number L) does that mean that L is a horizontal asymptote ? if the limit ...

*May 14, 2016*

**Math**

Use quadratic formula to find all x's and chose the one that is x>0

*May 13, 2016*

**physicss**

1) Is it possible for the net torque to be opposite the direction of angular velocity 2) Can momentum be conserved if mechanical energy is not conserved?

*May 12, 2016*

**English synonym**

I am writing an essay Do you guys know a word that is more powerful than encourages for example : the author encourages us to feel like.... but I want a word more powerful that is like the author is forcing us to feel that way

*May 9, 2016*

**calculus help amigos**

Find the point on the line 5x+5y+7=0 which is closest to the point (3,−4)

*May 7, 2016*

**Calculus quick question pls**

Yesss okay thank you sir

*April 24, 2016*

**Calculus quick question pls**

I don't get it ?

*April 24, 2016*

**Calculus quick question pls**

Why is there no vertical asymptote on F(x) = x/(x^2+1) What i learned is that to find vertical asymptote you have to set the denominator To 0 and solve for x ? In that case I find that x=-1,1

*April 24, 2016*

**HELP PHYSICS PLS :)**

Thank you Damon got the the right answer.Alex you are still getting participation marks hehe

*April 20, 2016*

**HELP PHYSICS PLS :)**

A 15 g bullet strikes and embeds in a 2.1 kg block suspended at the end of a 1.2 m string. After the collision the string rises to a maximum angle of 22 degrees to the vertical. what is the speed of bullet? what I did MASS OF BULLET = 0.015 KG i found the height of when it ...

*April 20, 2016*

**PHYSICSSS emergency**

= 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the spring unextended b) ...

*April 16, 2016*

**PHYSICS PLS HELP ME EVERYONE**

kreshnik ? loooool

*April 15, 2016*

**PHYSICS PLS HELP ME EVERYONE**

m1 = 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the spring unextended ...

*April 15, 2016*

**Calculus (30min before deadline help pls )**

A street light is at the top of a 16 ft pole. A 5 ft tall girl walks along a straight path away from the pole with a speed of 3 ft/sec. At what rate is the tip of her shadow moving away from the light (ie. away from the top of the pole) when the girl is 36 ft away from the ...

*April 9, 2016*

**maths**

There are 40 students in a class.14 of these students are girls. What percentage of the class are girls?

*April 5, 2016*

**Social Studies**

Which solution would best help control pollution in Lake Tai while keeping Wuxi strong? People should move away to make more parkland. Factories in Wuxi should limit their waste. ** Farmers should grow fewer crops. All factories in Wuxi should be closed.

*March 9, 2016*

**physics help plz :)**

I meant v=wr equation.

*November 15, 2015*

**physics help plz :)**

A bicycle spins 10 revs in 5.7 sec. The radius of the wheel is 15 cm a drop of water is 0.3 grams. What height will the drop of water reach when it comes off the wheel?--- I know that I have to use the v=we equation and that grams need to be in kg. But I'm not sure exactly...

*November 15, 2015*

**physics**

A curved road is banked at an angle such that friction is not necessary for a car to stay on the road. a 2500 kg car is traveling at a speed of 25 ms and the road has a radius of curvature equal to 40 m. calculate the magnitude of force that the road exerts on the car? I think...

*October 4, 2015*

**Chemistry**

Nevermind, I think I've figured out what I was doing wrong!!

*September 28, 2015*

**Chemistry**

The question says: when .422 g of phosphorus is burned, .967 g of a white oxide is obtained. Determine the empirical formula of the oxide. I did the calculations and got that there would be 1 mole Phosphorus and 4.29 mol Oxygen. To get the empirical formula, I would need to ...

*September 28, 2015*

**Math**

A scuba diver dives to a depth of 50 feet, then rises 15 feet, sinks 12 feet, then rises 20 feet. Write an expression to describe this situation. Then solve it.

*September 3, 2015*

**math**

PLACE 8 COUNTERS IN GROUPS OF 4

*June 1, 2015*

**business**

Yes but there it means like what jobs wear any kind of hats, helmets likethat are required.

*May 7, 2015*

**business**

What jobs require a helmet? I think construction workers hockey players but I cant think of anything else. Plz help me ASAP plz! Thank you !

*May 7, 2015*

**geometry**

Thank you she will get it soon!

*May 7, 2015*

**geometry**

Hello , my name is Amelia and my daughter is really confused on her homework about quadrilaterals. Can you help explain it to her so that she can understand it better? Please answer ASAP. Thank you Amelia V.

*May 7, 2015*

**PE**

If you are on the street with cars, ride your bike with the same rules like follow the red yellow and green light? @writeacher

*May 7, 2015*

**finite math**

An urn contains 4 red, 6 white, and 3 blue marbles. Three marbles are selected at random and without replacement. What is the probability that one of each color is selected? Give your answer as a decimal number, with 3 decimal places.

*February 22, 2015*

**Math**

Writing with exponents 2x2x2

*December 3, 2014*

**East and Southeast Asian**

You should break all of your questions into individual questions. With this we can't where to start.

*November 7, 2014*

**math**

At a supermarket,pineapple sells for $1 per pint(16 oz).Greg wants to buy eightin 40-oz cans of pineapple juice from the supermarket.How much does he have to pay altogeather?

*October 6, 2014*

**chemistry**

at a temperature of 5 celsius, 21.5 mg of a non electrolyte is dissolved in enough water to make a 150.0 ml solution. the osmotic pressure of the solution is 0.200 atm. what is the molar mass of the substance dissolved

*September 8, 2014*

**Math**

In the number 7,725, which places contain digits where one digit is ten times as great as the other?

*August 14, 2014*

**Math**

You pay 3.3 cents per minute for long-distance phone calls on your phone. Your phone bill is $3.40. Write and solve an equation to find the number of minutes m of long-distance calls you made. A. ; 103 minutes B. ; 11 minutes C. ; 83 minutes D. ; 10 minutes

*April 23, 2014*

**business**

Mr . X calls your office to see your employer, who has forgotten about the appointment and is now lunching at his club with an important overseas client. How would you deal with the situation?

*March 15, 2014*

**Help! - Writeacher!!**

Help!! Can you check my answers? 1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly* rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along the hiking trail. (1...

*March 12, 2014*

**project management**

explain ES=5, LF=5, SL=O

*August 23, 2013*

**Chemistry**

I'm not getting the correct answers, sorry. Can you expand on the explanations?

*June 21, 2013*

**chem**

Here's my work, but it wasn't the correct answer: The two half-reactions: Fe3+ + e- --> Fe2+ E = 0.77 V 2H+ + 2e- --> H2 E = 0 V You multiply the first one by 2, so it looks like the formula above: 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq). Ecell = 0.77 V lnKsp...

*June 21, 2013*

**chem**

Determine the equilibrium constant for the following reaction. 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq)

*June 21, 2013*

**Chemistry**

I did the same thing for part b: Flipped the E for the lesser value (Fe half reaction) 0.80 - 0.771 = 0.029, but it wasn't correct.

*June 21, 2013*

**university of the south pacific**

at high noon, the sun delivers 1000w to each square meter of a blacktop road.if the hot asphalt transfers energy only by radiation, what is it's steady-state temperature?

*May 30, 2013*

**chemistry**

sorry that ssupposed to say 320 K

*April 6, 2013*

**chemistry**

If 22.0 of gas has a volume of 0.22 at 320 , what is its pressure in mmHg?

*April 6, 2013*

**Dynamics**

It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output delivered by the hydraulic ...

*February 22, 2013*

**math**

show me how to do 400 divided by 43.18=

*November 19, 2012*

**science-please help due first thing tommorw**

the same alkali(sodium hydroxide)can be found in both hair gel and oven cleaner.explain why it is safe to put hair gel on your skin, but not on oven cleaner. plz help!Be as acurate as possible and it has to be an outstanding scientific explanation.

*November 8, 2012*

**Physics**

A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.

*November 7, 2012*

**Physics**

Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean?________N (b) What is the weight of a 10....

*November 7, 2012*

**Physics**

An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale reads 265 N. Chris’s...

*October 22, 2012*

**Physics**

007 (part 1 of 2) An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N 008 (part 2 of 2) If the same elevator accelerates downwards with...

*October 22, 2012*

**Physics**

An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N

*October 22, 2012*

**Math Statistics**

Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hours in one week on the average, how many hours a day does she work if she works 5 days a week?

*October 19, 2012*

**Math Statistics**

What is the difference between "weighted mean" and "arithmetic mean?"

*October 19, 2012*

**Math Statistics**

Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hour in one week on the average, how many hours a day does she work?

*October 19, 2012*

**Math**

The average height of Al, Anne, and Allan is 66 inches. If Arnel is included in the group, their average height becomes 70 inches. How tall is Arnel?

*October 17, 2012*

**Math**

7 days

*October 17, 2012*

**Physics**

After a day of testing race cars, you decide to take your own 1502.5 kg car onto the test track. While moving down the track at 11.4 m/s, you suddenly accelerate to 30.2 m/s in 19.2 s. What average net force have you applied to the car during that time?

*October 15, 2012*

**Physics**

b) If the car is moving much faster than the heavier truck when they collide, what best describes the size (or magnitude) of the forces between the car and the truck? 1. Not enough information is given to pick one of these answers. 2. Neither exerts a force on the other; the ...

*October 14, 2012*

**Physics**

Consider the collisions between a car and a truck whose weight is much heavier than the car (M ≫ m). Friction is so small that it can be ignored. If they are both moving at the same speed when they collide, what best describes the size (or magnitude) of the forces ...

*October 14, 2012*

**Math**

assume 8 males audition, one of them being Miles, 6 females audition, one of them being Jackie, and 4 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. How many different ways can these roles be filled if ...

*September 10, 2012*

**AP Biology**

Damaraland mole-rats are relatives of naked mole-rats. In their clans, too nonbreeding individuals of both sexes cooperatively assist one breeding par. Even so, breeding individuals in wild Damaraland mole-rat colonies usually are unrelated, and few suboordianes move up in the...

*September 3, 2012*

**Science**

Why is it that you cannot use the largest objective for some slides?

*August 19, 2012*

**Science**

When you are focusing an object under the microscope, explain why some parts are in focus and some part are out of focus?

*August 18, 2012*

**Algebra**

(6y)/(y^2+y-72 divided by (y^6)/(8-y).

*August 13, 2012*

**physics**

What is the wavelength of an electron moving at 2.60% of the speed of light? 1 m

*May 29, 2012*

**physics**

TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each ...

*May 29, 2012*

**physics**

Electromagnetic radiation having a 12.0 µm wavelength is classified as infrared radiation. What is its frequency? 1 Hz i got 1.31e+13???

*May 29, 2012*

**physics**

Got it!

*May 29, 2012*

**physics**

Citizen's band (CB) radio utilizes frequencies between commercial AM and FM. What is the frequency of a 11.34 m wavelength CB channel? 1 MHz How do you solve for MHz

*May 29, 2012*

**physics**

oh its 11.7! got it thank you!

*May 29, 2012*

**physics**

12 didn't work

*May 29, 2012*

**physics**

(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. 1 cm (frequency = 900 MHz) 2 cm (frequency = 2560 MHz) (b) Which frequency would produce smaller hot spots in foods due to interference effects? 3 MHz

*May 29, 2012*

**physics A**

im sorry, i just wanted to group my questions together so they would be easyier to find later

*May 16, 2012*

**physics**

the second answer is supposed to be in the hundreds

*May 14, 2012*

**physics**

The operating potential difference of a light bulb is 120 V. The power rating of the bulb is 105 W. Find the current in the bulb and the bulb's resistance. Current 1 A Resistance 2 I got 0.916 for A and 115 for B but they are wrong

*May 14, 2012*

**physics**

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1

*May 14, 2012*

**physics**

the third answer is supposed to be in $

*May 14, 2012*

**physics**

I got A and B i cant figure out C

*May 14, 2012*

**physics**

A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $ 3

*May 14, 2012*