Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 743

**math**

A group medical practice has 40,000 patients. Charts vary in thickness from 1/4 to 1 inch thick. The average of all charts is 1/2 inch thick. Using the average 1/2 inch thickness, how many inches of shelf space will be required for 40,000 charts?

**chemistry**

if the mass of a metal is 127.70 grams, what is number of moles on the metal in the cube?

**chemistry**

How many water molecules are in the recommended volume of water (1.50L) that should be consume daily?

**chemistry**

what volume of water should be weighted out to represent one mole of water molecules at 20 degree C

**chemistry**

could donuts be quantified in terms of mass instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say...

**chemistry**

could donuts be quantified in terms of instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say you ...

**chemistry**

invent a term to describe a certain number of something you use that isn't already being used. Define and explain

**chemistry**

Assuming that the price of god is $11,000.00/Kg, What is the approximate $value of one mole of gold atoms?

**chemistry**

oh then good thanks a lot

**chemistry**

When will hydrogen bonding occur?Give an example of liquid other than H2O in which this type of force is important. In order for a hydrogen bond to occur there must be both a hydrogen donor and an acceptor present. The donor in a hydrogen bond is the atom to which the hydrogen...

**chemistry**

thank you

**chem**

so wrong post

**chem**

thanks now I understand way to go

**chemistry**

thanks a lot i was waiting for your comment

**chemistry**

Based on their boiling point, CH3CH2OH bpt. 78C, CH3CH2CH2OH bpt. 97C, CH3CH2CH2CH2OH bpt. 118 C how will I be able to rank these three in terms of strength of their IMF.Pls kindly explain it they gave this a a homework and never been discussed in class. thank you

**chemistry**

Rank C2H6O, C3H8O and C4H^10 O in terms of IMF and explain their structures? neeed heeelppp.thank you

**physics**

How high will a 1.85 kg rock go if thrown straight up by someone who expends 80.0 J of energy on it?

**Science**

How do you show a car constant speed Horizontal line or vertical

**Physics**

A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet's speed is 350 m/s, how far below the bull's eye does the bullet strike the target?

**Physics**

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?

**Physics**

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?

**Physics**

A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet speed is 350 m/s, how far below the bull's eye does the bullet strike the target?

**basic statistics**

What is construct a 95 percent confidence interval about the sample mean N= 11?

**human growth and Development11**

Samuel,a50-year-old psychologist, claims that he is a victim of"revolving door syndrome" What is Samuel's problem?

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...

**algebra**

L= 2+2W perimeter = 2L+2W 28=2L + 2W 28=2(2+2W) + 2W 28=4+4W+2W 28=8W+2W 28=10W 28/10=W W=2.8

**math**

2(x-3)=(14-x)/5 10(x-3)=14-x 10x-30=14-x 11x-30=14 11x=44 x=4

**Physics**

wait nevermind i got it. i put in the wrong number. thanks :D

**Physics**

i did that for part a but i got 2.73 and the answer says its 2.87

**Physics**

A simple pendulum 1.50 m in length has a 500-g putty ball as an end bob. The pendulum is pulled aside 60° from the vertical and given an initial tangential speed of 1.20 m/s. At the bottom of the arc path, the bob hits and sticks to a 200-g putty ball sitting on a tee. (a)...

**accounting**

kathy burnett works for trinity industries. Her pay rate is 12.84 per hour and receives overtime pay at one and one-half times her regular hourly rate for any hours worked beyond 40 in a week. During the pay period that ended December 31,2013, Kathy worked 48 hours. Kathy is m...

**math**

Find the distance to the horizon @ 32,000 feet.

**MATH**

An object is fired vertically upward with an initial speed of 68.6 meters per second. After t seconds, the height is shown by y = 4.9t^ + 68.6 t meters. Given that this object has an initial speed of 68.6 m/s, what is the maximum height it will reach?

**biology**

need help with a paper from news article on human biology using scientific method?

**Pre-Algebra 2**

write a rule for the linear function in the table x 1, 2,3,4, f(x) -7, -10,-13,-16

**acids **

Which of the following bases is the weakest? (CH3)2NH , Kb = 5.1 x 10–4 ClO–, Kb = 2.9 x 10–7 SO42–, Kb = 8.3 x 10–13

**applied physics**

Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions

**math**

simplify 15xy/35x

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...

**Physics**

What is the magnitude of buoyant froce acting on a 720 cm^3 toy submarine foating in fresh water? (d water=1 g/cm^3)

**Physics**

A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...

**Physics**

A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? Is this answer right: 7800/10130 = 0.770

**Physics**

Use the first law of thermodynamics to determine the amount of heat change, Q, and whther it was added to or removd from the system. W=225J Delta U=600J Q=?

**Physics**

A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?

**Physics-Is this correct?**

A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? answer: 7800/10130 = 0.770

**Physics-is this correct?**

A person heats up a can of soup on a stove. If he does 250 joules of work on the soup by stirring it as the burner adds 1675 joules of heat, what is the change in its internal energy? I took 1675j - 250 j = 1425j

**Physics-is this correct?**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...

**Physics**

Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...

**social studies**

what happened to florida at the end of the american revolution

**Chemistry**

thank you Dr. Bob!

**Chemistry**

and for the sake of understanding.. can someone tell me what would happen if the reaction was exothermic instead of endothermic?

**Chemistry**

Consider this system at equilibrium. A(aq) <-> B(aq) Delta H = +750 kJ/mol .. What can be said about Q and K immediately after an increase in temperature? a] Q > K because Q increased.. b] Q>K because K decreased.. c] Q<K because Q decreased.. d] Q<K because ...

**Chemistry**

OHH (2.567)^2*0.637 = 4.197?! .. or was that a fail epiphany

**Chemistry**

Hi Dr. Bob, (3.03)^2 * 0.637 = 5.85? What would I do with the first equation that i got?

**Chemistry**

If someone could please be kind enough to see me through this problem? Calculate the value of Kp for the equation C(s) + CO2(g) <--> 2CO(g) Kp? Given that at a certain temperature.. C(s) + 2H2O(g) <--> CO2(g) + 2H2(g) Kp1 = 3.03 and H2(g) + CO2(g) <--> H2O(g)...

**Chemistry**

thank you!

**Chemistry**

In which direction will the net reaction proceed. X(g) + Y(g) <==> Z(g) .. Kp = 1.00 at 300k for each of these sets of initial conditions? 1) [X] = [Y] = [Z] = 1.0 M a] net reaction goes to the left [this one?] b] net reaction goes to the right c] reaction is at equilibr...

**Physics**

It takes 1110 calories of energy to melt a 185 gram lump of lead. What is lead's latent heat of fusion?

**Physics**

A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from that water to chill its temperature from 55 c to 4 c? Q = m(c)(delta t) Q = (100g)(1.0 c/g*c)(51c) = 40,800 Is the answer correct?

**Physics**

Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...

**Physics**

Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...

**Chemistry**

Thank you so much Dr. Bob

**Chemistry**

For A+2B <-> 2C and Kc = 2.13 For 2C <-> D and Kc = 0.254 Calculate the value of equilibrium contant for the reaction D <-> A+2B I'm so sorry to bother anyone.. but am i only supposed to multiple 2.13 and 0.254 together in order to get the third value of ...

**Chemistry**

Thank you for proofreading!

**Chemistry**

At 389K, this reaction has a Kc value of 0.0682. 2X(g) + 2Y(g) <-> Z(g) .. Calculate Kp at 389K. Kp= this is what I did.. can somebody confirm or find any mistakes in my thought process? Kp = Kc(R)(T)^Delta n Delta n = (1)-(2+2) = -3 Kp = (0.0682)(0.08206)(398K)^-3 = 0.0...

**Chemistry**

ohhh it was no effect and no effect for 1 and 3 i got it

**Chemistry**

Ohh i understand Dr. Bob. So in terms of adding more.. would that be the same as increasing concentration? For example: S(s) + O2(g) <-> SO2 1] how will adding more S(s) shift the equilibrium? a] to the right [this?] b] to the left c] no effect 2] How will removing some ...

**Chemistry**

Did I answer this equilibrium question correctly? 2CO(g) + O2(g) <-> 2CO2(g) 1) How will increasing the concentration of CO shift the equilibrium? a] to the right [i chose this] b] to the left c] no effect 2] how will increasing the concentration of CO2 shift the equilib...

**Physics**

Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely?

**Physics**

Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...

**Physics**

A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?

**Physics**

A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?

**Physics**

A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy

**Physics**

At the lowest point in its swing, a 2.5 kilogram pendulum bob has 40 Joules of kinetic energy. How high will its swing when it reaches the highest point in its swing?

**Physics**

What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3)

**PHYSICS**

A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of friction, will the conducto...

**PHYSICS**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2...

**physics**

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help power= work/time= 1/2 m v^2/8 1/2(1500k)(30)^2 2/8 =168750 is this correct?

**physics**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2...

**physics**

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help power= work/time= 1/2 m v^2/8 1/2(1500k)(30)^2 2/8 =168750 is this correct?

**Physics**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2...

**PHYSICS**

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help

**PHYSICS**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance.

**PHYSICS**

A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of friction, will the conducto...

**Living ENvironment**

In a hydrolysis reaction (enzyme) the bonds in substrate are weakened right always

**Algebra**

2= 10+z/-3

**Chemistry**

got it thank you!

**Chemistry**

In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 58.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 C when the reverse osmosis stops? ___M co...

**Chemistry**

OHHHHHHHHHHHHHHHHHHHHHHHHHH....... THANKS DR BOB!!!! always so helpful

**Chemistry**

The boiling point of an aqueous solution is 102.16 C. What is the freezing point? Dr. Bob, If you happen to answer this question, I was the one that a question earlier about how to know what Kf constant to use [water vs benzene?] and i didn't notice that it was given in th...

**Chemistry**

At -15.0 C, what is the maximum mass of fructose (C6H12O6) you can add to 3.00 kg of pure water and still have the solution freeze? Assume that fructose is a molecular solid and does not ionize when it dissolves in water. I'm confused on how you pick the Kf value.. Usually...

**Physics**

A crystal chandelier hangs in a fancy ballroom. Draw a free body diagram for the chandelier, including all vertical forcs affecting it. Please help :)

**Physics**

A toddler on a tricycle slowly rolls down a steep hill withour pedaling. It takes her six seconds to reach a speed of 8.1 m/s. Find the toddler's acceleration. a=v/t 8.1 m/s / 6 = 1.35 m/s^2 how far has the toddler traveled? d=vot + 1/2 at^2 (8.1)(6) + 1/2 (1.35)(6)^2 48.6...

**Physics**

Jamaican sprinter Usain Bolt holds the world record for the men's 100 meter dash with a time of 9.58 seconds. Another runner is training to break this record and finds that he can accelerate at a constant rate of 1.07 m/s^2. Assuming that the runner starts from rest, will ...

**Physics**

A 784 Newton astronaunt travels to Neptune's largest moon, Triton, with a simple bathroom scale. While standing on the surface of the moon, he finds that he now weighs only 62 Newtons. What is g, acceleration due to gravity, on Triton? g=weight/mass Is that 784/62? Sorry ...

**Physics**

A 784 Newton astronaunt travels to Neptune's largest moon, Triton, with a simple bathroom scale. While standing on the surface of the moon, he finds that he now weighs only 62 Newtons. What is g, acceleration due to gravity, on Triton?

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