Wednesday

February 22, 2017
Total # Posts: 1,052

**Chemistry**

Oxygen gas and hydrogen gas are used to synthesize dihydrogen monoxide. A lab group utilizes 1.00 liters of oxygen and 1.01 liters of hydrogen to create 0.75 grams of product. How many milliliters of product should the group have expected to get? What will the [H+] ...

*May 20, 2013*

**Applied Physics**

An anchor holding a boat stationary on a river forms a 65 degree angle with the river bottom. The anchor line is 40 meters long. Assuming the river has a uniform depth, how deep is the river directly below the boat?

*May 20, 2013*

**Mathematics Ms Sue help**

thanks

*May 20, 2013*

**Mathematics Ms Sue help**

How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)

*May 20, 2013*

**Mathematics Ms Sue help**

thanks for all you guys helps. drawing shows a better concept then straight digging it thanks

*May 20, 2013*

**Mathematics Ms Sue help**

sorry for the repost. thanks for all your help you provide everybody on the daily

*May 20, 2013*

**Ms Sue help**

An anchor holding a boat stationary on a river forms a 65 degree angle with the river bottom. The anchor line is 40 meters long. Assuming the river has a uniform depth, how deep is the river directly below the boat?

*May 20, 2013*

**Mathematics Ms Sue help**

You want to estimate the height of the Empire State Building. You start at its base and walk 15 m away. Then you approximate the angle from the ground at that point to the top to be 88 degrees. How tall do you estimate the Empire State Building to be?

*May 20, 2013*

**science**

Discuss the relationship between motion and force including the following terms: velocity, acceleration, equilibrium, contact force, and field force.

*May 9, 2013*

**physics**

Discuss the relationship between motion and force including the following terms: velocity, acceleration, equilibrium, contact force, and field force.

*May 9, 2013*

**Quantum/inorganic chemistry**

c. Which of these electron configurations has the 4F term symbol for its ground state? p3 d3 d4 f2 f3

*April 14, 2013*

**Math**

A dipole of 1 Debye is equal to 3.33 x 10^-30 C m . Show that in atomic units 1 D = 0.39345 au.

*April 14, 2013*

**math**

For the curve y = log(x+3) determine the following: a) asymptotes, if any. b) intercepts, if any. c) domain and range

*April 7, 2013*

**math**

thanks!

*March 31, 2013*

**math**

Another: theta is a second quadrant angle in standard position and tan theta = - (sqrt5)/(2) . Find the exact value of cos theta. I assume I use the equation 1 / cos(theta)^2 = 1 + tan (theta)^2 However how does this work out algebraically?

*March 31, 2013*

**math**

Another: theta is a second quadrant angle in standard position and tan theta = - (sqrt5)/(2) . Find the exact value of cos theta.

*March 30, 2013*

**math**

theta is a first quadrant angle in standard position and cos theta = 1/(sqrt10) . Find the exact value of sin theta,

*March 30, 2013*

**math**

Why do we write radian measures with a π rather than just give the decimal equivalent? (for example, why not use 1.88 rad instead of 3π/5 rad?) Thx

*March 25, 2013*

**math**

Why do we write radian measures with a π rather than just give the decimal equivalent? (for example, why not use 1.88 rad instead of 3π/5 rad?) Thx

*March 24, 2013*

**math**

thanks

*March 22, 2013*

**math**

imgur[dot]com/jpORgtf This is wayy to hard to type. What is the simplification of this question. Thanks.

*March 22, 2013*

**physic -shm**

a bob of pendulum is filled with water and small hole is made on the tip,and it is moved .how will the time period change?

*March 20, 2013*

**math**

and btw 3^2 = 25 is typo

*March 20, 2013*

**math**

fantastic, makes so much sense now, thx

*March 20, 2013*

**math**

Hello, Is log_3 (5) equal to log_5 (3)? Explain your answer. Do not evaluate the logarithms. is my question. What is a surefire way to show this is false.

*March 20, 2013*

**Physics**

A golf ball with a mass of 50.3 g can be blasted from rest to a speed of 72.1 m/s during impact with a club head. Assume that the impact lasts only about 0.910 ms. Calculate the change in momentum of the ball. Calculate the average force applied.

*March 18, 2013*

**Answer to number 3**

it is B

*March 14, 2013*

**Physics**

A sled rope is held at an angle of 45 degrees with the horizontal ground. A force of 60 N acting parallel to the ground is required to keep the sled in motion. How much force must be exerted on the rope?

*March 5, 2013*

**physics**

After falling from rest from a height of 30 m, a 0.48-kg ball rebounds upward, reaching a height of 20 m. If the contact between ball and ground lasted 1.8 ms, what average force was exerted on the ball?

*February 25, 2013*

**Quantum chemistry**

For the simple harmonic oscillator determine: b. [Tˆ,Vˆ ]

*February 24, 2013*

**programming**

m trying to create an arraylist that's sorted but I have no idea how to sort the numbers. I cant use the array.sort method here is my code: public class Testing { private int [] data; private int count; private static int defCapacity = 10; public Testing (){ count = 0; ...

*February 24, 2013*

**computer science**

Im trying to create an arraylist that's sorted but I have no idea how to sort the numbers. I cant use the array.sort method here is my code: public class Testing { private int [] data; private int count; private static int defCapacity = 10; public Testing (){ count = 0; ...

*February 24, 2013*

**chemistry**

A 0.10-mol sample of H2(g) and a 0.10-mol sample of Br2(g) are placed in a 2.0-L container. The reaction H2(g) + Br2(g) <----> 2 HBr(g) is then allowed to come to equilibrium. A 0.20 mol sample of HBr is placed into a second 2.0-L sealed container at the same temperature...

*February 11, 2013*

**Chemistry**

A ==> B + C A is (s) and not included in Kc 1.2 + 1.2 = 2.4 4.00 - 2.4 = 1.6 mol left

*February 5, 2013*

**Physics**

The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in the Figure 16-44 in the textbook. Assume that the net average charge (due to electron sharing) indicated on H and N atoms is 0.2e and on the indicated C and O atoms is 0.4e. ...

*February 4, 2013*

**math**

the largest value of n for which 10^n evenly divides 2^9*15^2*35 is a)2 b)3 c)4 d)5 e)6

*January 31, 2013*

**Physics (As Level) 12 Grade**

Yes, thank you. I worked it out, after a few minutes. Anyway, thank's a lot :)

*January 30, 2013*

**Physics (As Level) 12 Grade**

Not really helping much. A slightly worked example would be effective. But thanks anyway.

*January 30, 2013*

**Physics (As Level) 12 Grade**

2) An aircraft lands on a runway at a speed of 40 meters per second (ms^-1) and brakes to a halt in a distance of 860m. Calculate a) The Braking time. B) The deceleration of the aircraft.

*January 30, 2013*

**Physics**

A 70 kg person stands on a 30 kg platform and pulls on a massless rope with a force of 400 N. The rope passes around a pulley attached to a support (roof), and then around a second pulley attached to the platform before being anchored to the support (roof). All sections of the...

*January 22, 2013*

**physics**

In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner?

*January 13, 2013*

**Statistics**

Lol mate. This question is too long to be answered by us. Do it yourself, this is college level stuff.

*December 29, 2012*

**Physics**

What is the magnitude of the electric field 0.3 m from a 10-4 C point charge?

*December 4, 2012*

**Programing using Raptor ( Computer Logic)**

Create a program that determine the shipping cost for an order based on the following table: From $0.00 $20.00 $50.00 $75.00 To $19.99 $49.99 $79.99 $1000.00 Price $2.95 $3.95 $4.95 Free

*December 3, 2012*

**CHM**

How to balance the following equation: Na(s) + H2O(l) yields?

*November 27, 2012*

**physics**

Since momentum is conserved vf=1.3044

*November 19, 2012*

**Trig**

Suppose you would like to cross a 200-foot wide river in a boat. Assume that the boat can travel 35 mph relative to the water and that the current is flowing west at the rate of 5 mph. What bearing should be chosen so that the boat will land at a point exactly across from its ...

*November 18, 2012*

**Trig**

Suppose you would like to cross a 209-foot wide river in a boat. Assume that the boat can travel 32 mph relative to the water and that the current is flowing west at the rate of 6 mph. If the bearing chosen is chosen so that the boat will land at a point exactly across from ...

*November 18, 2012*

**math**

A solar home contains 3.50 multiplied by 105 kg of concrete (specific heat = 1.00 kJ/kg·K). How much heat is given off by the concrete when it cools from 29 to 20°C?

*November 13, 2012*

**Physics**

(a) Suppose that on the moon an astronaut hit a golf ball so that it left his club at a speed of 45ms-1, at an angle of 20degrees to the horizontal. calculate the time of flight of the ball. (b) calculate the horizontal distance travelled by the ball before landing

*October 28, 2012*

**Calculus 1**

differentiate f(x)=(1+sinˆ2x)ˆ6

*October 15, 2012*

**Calculus 1**

differentiate f(x)=(sinˆ2x)/(cosx)

*October 15, 2012*

**CHM**

freezing point of cyclohexane...yes I am using the depression of freezing point method

*October 10, 2012*

**CHM**

Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high, too low or unaffected? Explain. Please someone explain this to me I don't understand it...Thank you

*October 10, 2012*

**Math**

Given the following statistical list: 13,17,19,22,25,27,29,29,32,and 33. Assuming a desired "Confidence Level" of 95%, find the confidence interval for the above scores. 19.8 < u(mean)< 29.4 14.6 < u < 33 13.4 < u < 22.7 11.1 < u < 18.5 I have...

*October 2, 2012*

**physics**

A 140-W heater was placed in 2.00 kg of methanol and turned on for exactly 1 min. The temperature increased by 3.54°C. Assuming that all the heat is absorbed by the methanol, calculate the molar heat capacity of methanol.

*September 25, 2012*

**Chemistry**

A 1.00 g sample of enriched water, a mixture of H2O and D2O, reacted completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A 25.00 mL sample of the 1.00 L solution was reacted with excess AgNO3 and 0....

*September 21, 2012*

**Math**

A diver is working 10 feet below the surface of the water. The gap between the water and the deck of his support barge is 1/8 of the total length of the air hose and 2/3 of the total length remains on the reel. What is is maximum working depth?

*September 13, 2012*

**7th grade math**

25, base 5

*September 11, 2012*

**Physics**

a) The horizontal component of any velocity remains constant as it goes through the air, so the horizontal component of the initial velocity would still be 8.8i. The distance can be calculated using the formula Xf=Vx*t: Xf=8.8*2.7=23.76 b)Maximum height is given by the formula...

*September 1, 2012*

**math**

first you need to set it equal to zero 3x^2-48=0 then we factor we can pull the 3 out becasue 3 goes into 48 and 3x^2 so we would get something like this 3(x^2-16)

*August 29, 2012*

**Maths**

A garage bought 55000 litres of petrol for 86 pence a litre and sold it for 96 pence a litre calculate how much garage paid for petrol.

*August 19, 2012*

**Health**

D is incorect I put it on my test was wrong

*August 4, 2012*

**health!**

Correct Answer is Catastrophizing. C

*August 3, 2012*

**HEALTH**

of Course I mean A !!

*August 1, 2012*

**HEALTH**

B is correct answer ! Body Mass Index (BMI) is a number calculated from a person's weight and height. BMI provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.

*August 1, 2012*

**english**

Think of the action that the subject is performing.

*July 30, 2012*

**math**

If W(p)is congruent to 0(mod p), then p is a Wilson Prime. Show that 5 and 13 are Wilson Primes.

*July 30, 2012*

**math**

find the remainder when 13^16 + 17^12 is divided by 221.

*July 30, 2012*

**Statistics**

The amount of a monthly phone bill is normally distributed with a mean of $60 and a standard deviation of $12. Fill in the blanks: 68% of her phone bills are between $______________ and $______________.

*July 23, 2012*

**phsycs**

2cw=340*3/2=510m but the answer given is 514.5m?

*July 19, 2012*

**phsycs**

A person shouts in a canyon. 3 s later they hear the echo. How far away is the canyon wall from which the sound wave was reflected? how do i do this problem?

*July 19, 2012*

**physics**

Bobpursley Answered your question before too. Tried to attempt it. But my physics knowledge is limited.

*July 5, 2012*

**Physics (work and springs)**

A 4kg box is compressed 50cm on a spring (k=800 N/m) and then slides across a horizontal floor. If (u=0.4) between the box and the floor... A) how much work is done? B) assuming the frictional force is constant, how far will the box slide before it comes to a stop?

*July 2, 2012*

**statistics**

I need this answer.

*June 29, 2012*

**chemistry**

What is the molarity of a saline solution that contains 0.900 g NaCl (58.44 g/mol) dissolved in 100.0 ml of a solution?

*June 24, 2012*

**Physics**

(a) If the length of the Achilles tendon increases 0.55 cm when the force exerted on it by the muscle increases from 2200 N to 6000 N, what is the "spring constant" of the tendon? N/m (b) How much work is done by the muscle in stretching the tendon 0.55 cm as the ...

*June 8, 2012*

**Math**

factor out the greatest common factor -2p+40

*June 4, 2012*

**physics please help**

An astronaut stands at a position on the Moon such that Earth is directly overhead and releases a Moon rock that was in her hand. (c) What is the gravitational force exerted by the Earth on the same 2.7-kg rock resting on the surface of the Moon? answer in mN I keep ...

*May 25, 2012*

**physics**

Thanks Elena, but I tried the answer and its wrong I don't know why. Could you please help me. Thanks.

*May 25, 2012*

**physics**

Sorry I keep recalculating, but i keep getting 4.36 m/s and that's wrong I don't know what I am doing wrong.

*May 23, 2012*

**physics**

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What...

*May 23, 2012*

**physics**

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What...

*May 22, 2012*

**physics**

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What...

*May 22, 2012*

**physics please someone help**

Peggy drives from Cornwall to Atkins Glen in 52 min. Cornwall is 75 km from Illium in a direction 26° west of south. Atkins Glen is 27.1 km from Illium in a direction 16° south of west. Use Illium as your origin. (a) Draw the initial and final position vectors. (Do ...

*May 20, 2012*

**Physics**

Peggy drives from Cornwall to Atkins Glen in 52 min. Cornwall is 75 km from Illium in a direction 26° west of south. Atkins Glen is 27.1 km from Illium in a direction 16° south of west. Use Illium as your origin. (a) Draw the initial and final position vectors. (Do ...

*May 20, 2012*

**Physics**

Peggy drives from Cornwall to Atkins Glen in 52 min. Cornwall is 75 km from Illium in a direction 26° west of south. Atkins Glen is 27.1 km from Illium in a direction 16° south of west. Use Illium as your origin. (a) Draw the initial and final position vectors. (Do ...

*May 20, 2012*

**physics**

a satellite completes one revolution of a planet in almost exactly one hour. at the end of an hour , the satellite has traveled 2.0x10^7 meters and is only 10 meters away from its starting point. What is the numerical value of the satellite's average velocity after that ...

*May 19, 2012*

**Math**

Question 2 For the function f(x) = 3x2-2x-7, find f(2). Answer f(2) = 13 f(2) = 25 f(2) = 1 f(2) = 1/2 3 points Question 3 One day you work 3 hours and your boss gives you $22. Another day after working 4 hours your boss gives you $33. Yesterday after working 5 hours you get $...

*May 18, 2012*

**science**

sugar concentration os 10g/100ml given a teaspoon weighs 4 g calculate how many teaspoons of sugar you would consume if you drank a 600ml bottle of soft drink

*May 10, 2012*

**Environmental Economics**

Can forest harvesting still be ineﬃcient even where tenure is given on a individual basis and is secure? Why or why not? Please answer this question in 3 sentences or less.

*May 7, 2012*

**pre-calculus**

i'm so confused right now. can u solve one question for me so i can try the rest? thank you!

*April 22, 2012*

**pre-calculus**

if i had any idea about these problems i wouldnt ask you in the first place.

*April 22, 2012*

**pre-calculus**

(tan^2x-9)(2cosx+1)=0 Find one period 4cos^2x-4cosx+1=0 find all angles and name 8 angles 7sin^2x-22sinx+3=0 find all angles and name 8 angles 2cos^2x-7cosx=-3 find one period sinx(2sinx+1)=0 find one period

*April 22, 2012*

**pre-calculus**

tanx= -12/5 x in quadrant 2 find; sin2x= cos2x= tan2x=

*April 22, 2012*

**pre-calculus**

cosx= -8/17, 180<x<270 find; sin(x/2) cos(x/2) tan(x/2)

*April 22, 2012*

**physics**

Thank you. It was because of the units my units should have been as g/cm^3, so I got it now. Thank you, I really appreciate it :)

*April 10, 2012*

**physics**

Thank you.I don't know why, but it says the answer is wrong even though i have to answer it as g/cm^3 which would be 960000 g/cm^3 i assume, but even that's wrong! :/ I am really confused I don't know why its wrong.

*April 10, 2012*

**physics**

A U-shaped tube is partly filled with water and partly filled with a liquid that does not mix with water. Both sides of the tube are open to the atmosphere. If h1 = 0.46 m and h2 = 0.25 m, what is the density of the liquid? on the left side of the tube is the liquid h2= 0.25 m...

*April 10, 2012*

**Trig Help Please!!!**

i got that far too but i cant figure out the angle C!!!!

*April 5, 2012*