Thursday

July 2, 2015

July 2, 2015

Total # Posts: 380

**Chemistry**

How mush CaCl2, in grams, is needed to make 2.0 L of a 3.5M solution? g CaCl2 = (2.0L) *( 3.5 mol Cl-/1L) * (1mol CaCl2/ 2mol Cl-) *( 110.98 g CaCl2/ 1 mol CaCl2) = 5.549 g CaCl2 i don't think i did any of this right
*June 23, 2015*

**DragonWings LA**

?? Is right
*May 26, 2015*

**Physics**

Suppose the cross sectional of the tube is 0.05 cm2, what would be the volume (a) during the lowest pressure in the experiment? (b) during the highest pressure? (c) at the atmospheric pressure?
*April 23, 2015*

**Precalculus**

Ah, that makes sense! I always forget the trig addition formulas, thank you!
*April 15, 2015*

**Precalculus**

Evaluate: tan(arcsin(8/17)+ arctan(4/3)) I understand that I have to make triangles out of the values given-- with 15 being the other side of the 17 and 8 triangle, and 5 being the other side of the 4 and 3 triangle. I'm not sure where to go on from there, though.
*April 15, 2015*

**Math 141**

A pair of fair 6-sided dice is rolled. What is the probability that a 3 is rolled if it is known that the sum of the numbers landing uppermost is less than or equal to 6?
*April 8, 2015*

**Algebra**

Jan received $2,200 from her aunt as a birthday gift. She decided to put the money in an account to save for college. The account has a fixed interest rate of 7.7%, compounded annually. How much money will be in the account after five years?
*April 6, 2015*

**science**

ways to help farmers increase agricultural productivity
*January 10, 2015*

**science**

if .38 kJ of heat is added to 19.6 grams of ice at -12.0 degrees celsius, what will be the final temperature?
*January 10, 2015*

**Chemistry**

It suggests that those transition metals have lost there 's' orbital
*December 5, 2014*

**Math**

Peter has money in two savings accounts. One rate is 9% and the other is 11%. If he has $400 more in the 11% account and the total interest is $117, how much is invested in each savings account?
*November 26, 2014*

**Math**

How do you graph a rectangle and find its area if: A(1,-3) B(1,3) C(-9,3) D(-9,-3)
*November 23, 2014*

**Chemistry**

What is the density (in mg/mL) of a H2S gas at 12.9 atm and 137 K?
*November 8, 2014*

**chemistry**

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution before the addition of any KOH. The Kb of NH3 is 1.8 × 10-5. I thought that I would need a second volume to find the moles of NH3?
*November 6, 2014*

**Chemistry**

Silver carbonate [AgCar] has a density of 6.077 g/cm3. Calculate the mass (in fg) of carbon atoms [C] present in a AgCar crystal that has a volume of 457.6 Å3.
*October 28, 2014*

**Physics**

Jeff’s basketball falls into a pond. There is no wind and the water is still. Jeff wants to get the ball. He throws a rock into the pond, which hits water at 2 ft behind the ball from Jeff’s view. What will happen to the ball?
*October 26, 2014*

**Social Studies**

ok thank you
*October 9, 2014*

**Social Studies **

Why is diplomacy a key part of U.S. foreign policy? Because it helps prevent wars and helps countries settle issues and work together I really don't know
*October 9, 2014*

**Social studies**

I am not supposed to use Wikipedia a s a source but maybe this will give me a better idea thanks
*October 9, 2014*

**Social studies **

How has the US economy changed over the past 50 years? I know it used to be mainly farming and manufacturing but now we have expanded on this with medical research technology, and education but I need help expanding this answer
*October 9, 2014*

**chemistry **

Experimental Molar Ratio of Copper in CuxOy
*October 8, 2014*

**College Physics**

Col. John Stapp led the U.S. Air Force Aero Medical Laboratory's research into the effects of higher accelerations. On Stapp's final sled run, the sled reached a speed of 284.4 m/s (632 mi/h) and then stopped with the aid of water brakes in 1.4 s. Stapp was barely ...
*October 6, 2014*

**English check**

Which principal part of the verb to teach appears in this sentence. Then she taught me how to cultivate rich and healthy soil and helped me identify which types of plants are best for the environment in my yard. past past participle present present participle I really don'...
*October 5, 2014*

**physics**

A mass pulled by a constant force accelerates from 10 cm/s to 40 cm/s in 5.5 s. A second force accelerates the same mass from rest to 105 cm/s in 15.0 s. If the first force is known to be 5.0 N, that what is the magnitude of the second force?
*September 30, 2014*

**physics**

Question: The swim portion of a triathlon takes place in a river and is an out-and-back course. The river has a steady current that is 0.400m/s and the athletes swim against the current for 750m before turning and swimming with the current for the second 750m. If one ...
*September 16, 2014*

**math**

Mega Mart collects sales tax equals to 1/16 of the retail price. Is the amount of tax collected proportional to the cost of an item before tax is added
*September 10, 2014*

**math**

Sales tax is 1/16. What is the tax when retail price is 16.
*September 10, 2014*

**Science Check PLEASE**

must be in connections? Your third one I don't think is right. I believe it is B. The rest look right!
*September 2, 2014*

**Environmental Science **

Answer the questions about the following processes in the space provided below. You only need to indicate a process by its number. For each question list as many processes as apply. Process 1: 6 CO2 + 6 H2O → C6H12O6 + 6 O2 Process 2: C6H12O6 + 6 O2 → H2O + 6 CO2...
*August 18, 2014*

**Environmental Science **

H.B.D. Kettlewell observed that peppered moths in the forests of England were becoming darker in color over time. In addition, he observed that pollution had turned the tree trunks black. He thought it would be easy for birds to spot and capture light-colored moths resting on ...
*August 7, 2014*

**Math**

On joes farm there are 99 animals. There are four times as many cows as horses on the farm. There are twice as many horses as lives. How many horses, cows, and pigs are there?
*March 3, 2014*

**Physics**

A wooden block of mass m = 2.3 kg starts from rest on an inclined plane sloped at an angle 26 degrees from the horizontal. The block is originally located 1.9 m from the bottom of the plane. Assume the inclined plane is friction less. 1)What is the magnitude of the component ...
*February 25, 2014*

**math **

suppose x is a uniform random variable with c=40 and d=70. find the standard deviation of x
*February 25, 2014*

**math**

the diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 6.5 tp 8.5 millimeters. what is the mean diameter of a ball bearings produced in this manufacturing process?
*February 25, 2014*

**english**

consider what you have learned about American history during the period 1860 to the early 1900s. how do the stories in unit 4 reflect what was going on in the country then?
*January 9, 2014*

**Math**

Ok thanks Steve. That makes a lot more sense now.
*January 8, 2014*

**Math**

Help! I dont know how to find the complement of a 30 degree angle! Please help me!
*January 8, 2014*

**Psychology**

How has the definition of social facilitation evolved
*January 6, 2014*

**physics. HELP**

A water balloon is thrown into the air and lands 30.0 meters away 1.8 seconds later. a. What was the speed of the balloon thrown (on the diagonal) b. At what angle was the balloon thrown with respect to the ground?
*December 16, 2013*

**physics. HELP**

A person has the ability to jump with an initial speed of 6.0 m/s at an angle of 35 degree with the ground. a. How long will the person be in the air? b. How far horizontally will the person travel?
*December 16, 2013*

**physics. HELP**

An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?
*December 16, 2013*

**physics. HELP**

I think the initially velocity is 0.
*December 16, 2013*

**physics. HELP**

A projectile is launched horizontally with a speed of 80.0 m/s. If the projectiles is launched above the floor, how long does it take the projectile to hit the floor?
*December 16, 2013*

**physics. HELP**

A projectile is launched horizontally with a speed of 80.0 m/s. If the projectiles is launched above the floor, how long does it take the projectile to hit the floor?
*December 16, 2013*

**physics**

A water balloon is thrown into the air and lands 30.0 meters away 1.8 seconds later. a. What was the speed of the balloon thrown (on the diagonal) b. At what angle was the balloon thrown with respect to the ground?
*December 16, 2013*

**physics**

A person has the ability to jump with an initial speed of 6.0 m/s at an angle of 35 degree with the ground. a. How long will the person be in the air? b. How far horizontally will the person travel?
*December 16, 2013*

**physics**

An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?
*December 16, 2013*

**physics**

A hunter aims directly at a target (on the same level) 170 meters away. If the bullet leaves the gun with a speed of 40 m/s, by how much will it miss the target? i.e. What is the vertical drop of the bullet?
*December 16, 2013*

**phyics**

A projectile is launched horizontally with a speed of 80.0 m/s. If the projectiles is launched above the floor, how long does it take the projectile to hit the floor?
*December 16, 2013*

**physics**

A 2.0 kg rock is dropped from the top of a building. I lands 14.0 seconds later. How tall was the building?
*December 16, 2013*

**Physics, HELP**

AN auto, moving too fast on a horizontal stretch of mountain road, slides off the road, falling into deep snow 43.9 meters below the road and 87.7 meters beyond the edge of the road. a. How long did the auto take to fall? b. How fast was it going when it left the road?
*December 12, 2013*

**physics. HELP**

Phil jumps off a high-diving platform with a horizontal velocity if 2.8 m/s and lands in the water 2.6 seconds later. a. How high is the platform b. How far out from where he jumped does he land?
*December 12, 2013*

**Physics... HELP**

A toy car runs off the edge of a table that is 1.225 meters high. If the car lands 0.400 meters from of the table, a. How long does it take for the car to fall? b. What is the horizontal velocity of the car?
*December 12, 2013*

**physics**

A dart player throws a dart horizontally at a speed of of 12.4 m/s. The dart hits the board 0.32 meters below the height from which it was thrown. How far away is the player from the board?
*December 12, 2013*

**physics**

A missile is fired horizontally with an initial velocity of 300 m/s from the top of a cliff 200.0 meters high. a. How long does it take the missile to reach the bottom the cliff? b. How far from the base of the cliff does the missile strike the ground?
*December 12, 2013*

**math**

A model rocket is launched with an initial velocity of 160 ft/s. The height, h, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 160t. How many seconds after launch will the rocket be 350 ft above the ground? Round to the nearest hundredth of a ...
*November 22, 2013*

**Math**

state the amplitude, period, frequency, phase shift and vertical shift of each function, Then graph two periods of the function of: 1) y=3 sin(x-pie/4) 2) y=0.25cosx+3
*October 12, 2013*

**Physics**

A car enters the freeway with a speed of 5 . 6 m/s and accelerates uniformly for 3.6 km in 2.7 min. How fast is the car moving after this time? Answer in units of m / s
*October 9, 2013*

**chemistryhelp**

how many moles of excess reactant are present when 3.20 x 10^2 mL of 0.226 M sulfuric acid reacts with 0.531 L of 0.185 M sodium hydroxide to form water and aqueous sodium sulfate
*October 2, 2013*

**Math - Advanced Functions**

the function f(x)=-0.005x^2+0.8x+12 models the relationship between a certain vehicle's speed and a fuel economy, where f(x) is the fuel economy in kilometres per litre and x is the speed of the vehicle in kilometres per hour. Determine the rate of change in fuel economy ...
*September 30, 2013*

**Logarithm**

The rate of auto thefts triples every 6 months. (a) Determine, to two decimal places, the base b for an exponential model y = Ab^t of the rate of auto thefts as a function of time in months. b = (b) Find the doubling time to the nearest tenth of a month. months
*September 3, 2013*

**Physics**

Water flows into a swimming pool at the rate of 5 . 25 gal / min. If the pool dimensions are 33 . 8 ft wide, 40 ft long and 11 . 1 ft deep, how long does it take to fill the pool? (1 gallon = 231 cubic inches) Answer in units of min
*August 30, 2013*

**Calculus**

Thanks!!
*August 29, 2013*

**Calculus**

You have just opened a new nightclub, Russ' Techno Pitstop, but are unsure of how high to set the cover charge (entrance fee). One week you charged $9 per guest and averaged 165 guests per night. The next week you charged $10 per guest and averaged 150 guests per night. (a...
*August 29, 2013*

**Math (Algebra)**

3 robots go out to lunch. They decide to share the $11.91 bill evenly. How much does each robot pay? Equation: 3x = 11.91 #1. What does x represent? #2. Solve for x. #3. Answer the question.
*May 6, 2013*

**Math (Algebra)**

The Problem is that 3 people go to lunch. They decide to share the $12 bill evenly. How much does each person pay? The Equation is 3x=12 #1. What is the value of x? #2. Solve for x #3. Answer the question.
*May 6, 2013*

**math**

If a prism was filled with 43 cubes with half unit side lengths. what is the volume of the prism in cubic units?
*April 22, 2013*

**social studies**

what religion did India's mughal conquerors follow
*April 11, 2013*

**statistics**

In a carnival game, a player spins a wheel that stops with the pointer on one (and only one) of three colors. The likelihood of the pointer landing on each color is as follows: 65 percent BLUE, 22 percent RED, and 13 percent GREEN. Note: Your answers should be rounded to three...
*March 31, 2013*

**Physics**

A 4 kg crate slides down a ramp.the ramp 2.9 m in length and incline at an angle of 35 degress.the crate start from rest at the top and has a friction force of 3 n.what is the speed of the crate
*March 25, 2013*

**Math**

The difference between the prices of two bikes is $22. The sum of the prices is $328. How much does each bike cost?
*March 14, 2013*

**math**

Order the numbers from least to greatest 4/6,4/8,3/4,5/8
*March 12, 2013*

**Chemistry**

How do I find the number of particles in 1 pound of NH3(Ammonia)?
*March 10, 2013*

**physics**

An ethernet cable is 3.95 m long and has a mass of 0.190 kg. A transverse pulse is produced by plucking one end of the taut cable. The pulse makes four trips down and back along the cable in 0.820 s. What is the tension in the cable?
*February 20, 2013*

**Algerbra**

HELP!!!!!!! I have to find a rule for the following in and out. Input: 1,2,3,4 Output: 3,9,18,30 Thank you!!
*February 19, 2013*

**AP Physics**

Thanks!
*February 19, 2013*

**AP Physics**

So my question is about projectile motion. We just learned in class about the equation for finding the range: R=v^2sin(2theta)/g I understand that and I think I see where it comes from. My question is, if someone were to collect data on the projectile range for different ...
*February 19, 2013*

**History**

The 10th amendment basically says that any powers that the Constitution doesn't give to the federal government or keep the states from having automatically are reserved for the States. One example would be that since constitution doesn't give the federal government ...
*February 19, 2013*

**Physics**

A block of wood (10-kg) at rest is hit by a bullet (50-g) that embeds itself in the block and causes both to now move at 2.7-m/s eastward. What is the initial velocity of the bullet?
*January 31, 2013*

**Physics **

A 2kg mass, initially at rest, is shot from a spring (k=550N/m) which is compressed by 1.3m. The 2kg mass hits a stationary 6kg mass (the actual collision lasts 0.02seconds). After the collision the 2kg mass is travelling 11m/s to the left. To the right of the 6kg mass is a ...
*January 22, 2013*

**college algebra**

What are the zeroes of f(x) = 2x^2 -3x + 1
*January 12, 2013*

**health**

I am on a shake and when I wasn't on it I wasn't healthy but now when im taking it...It makes me less hungry and dizzy.What should I do?
*December 19, 2012*

**chemistry**

A sample of gas has a mass of 0.585g . Its volume is 110mL at a temperature of 95^\circ C and a pressure of 745mm\;Hg .
*December 12, 2012*

**math excel**

an antelope ran 237 feet in 3 seconds. if the antelope continued to run at the same rate, how many seconds would it take him to run 790 feet
*November 28, 2012*

**math**

Two runners start moving from the same point A on a circular track but in oppostite directions. Their speeds are 5 ft. per second and 9 ft. per second. If they start at the same time and finish when they first meet at point A again, how many times do they meet, excluding the ...
*October 31, 2012*

**statistics**

Suppose you wanted to test your ESP using an ordinary deck of 52 cards, which has 26 black and 26 red cards. You have a friend shuffle the deck and draw cards at random, replacing the card and reshuffling after each guess. You attempt to guess the color of each card. What is ...
*October 20, 2012*

**Chemistry**

1.82 atm :)
*October 14, 2012*

**Math**

what is the answer to the numbers 23*17=?
*October 9, 2012*

**Chemistry**

You are in a mountain range with atmospheric air pressure of 520 , and you wish to boil some eggs. What is the approximate boiling point of the water at this air pressure? Express your answer as an integer and include the appropriate units.
*October 4, 2012*

**social studies**

on what terms did BC enter confederation?
*October 1, 2012*

**Math**

3 pens and 2pencils sold for $.47. What Is the price for set of pen and pencil?
*September 24, 2012*

**algebra 1**

make an imput-output table for the function. use 0,1,2,and 3 as the domain. the qyestion is y=x+18
*September 23, 2012*

**government**

in 3-4 sentences, explain why is voting important in a democratic society.
*June 29, 2012*

**government**

thank you
*June 29, 2012*

**chemistry**

I have my exam in a little over 7 hours...can anyone help explain how to draw atoms in the Bohr Rutherford and Lewis Dot methods, as well as how to draw them as compounds and ions? My friends are no help, nor is the internet. Please!
*June 21, 2012*

**Algebra**

Translate into a variable expression. the difference between the square of k and the total of k and 20
*May 2, 2012*

**life orientation**

5 ways in which the human or environmental problem impacts on the community about teenage pregnancy in 10 to 15 lines
*April 19, 2012*

**life orientation**

5 ways in which the human or environmental problem impacts on the community about teenage pregnancy
*April 19, 2012*

**Chemistry**

A 100 mL sample of 0.10M HCl is mixed with 50mL of 0.10M NH3 (Kb=1.8x10^-5). What is the resulting pH?
*April 12, 2012*

**Chemistry**

A 100 mL sample of 0.10M HCl is mixed with 50mL of 0.10M NH3 (Kb=1.8x10^-5). What is the resulting pH?
*April 12, 2012*