Tuesday

April 28, 2015

April 28, 2015

Total # Posts: 1,743

**Physics**

A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. When the amplitude of the motion is 0.090m , it takes the block 2.68s to travel from x= 0.090m to x= -0.090m . If the amplitude is doubled, to 0.180m , how long does it ...
*April 26, 2015*

**Math**

you have four $1 bills, two $5 bills, five $10 bills, and five $ 20 bills in your wallet. You select a bill at random. Without replacing the bill, you choose a second bill. What is P($1, then$ 10)?
*April 22, 2015*

**Chemistry**

Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 16.2 g of ethane is mixed with 19. g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to ...
*April 10, 2015*

**physics**

The man fires an 75g arrow so that it is moving at 80 m/s when it hits and embeds in a 13kg block resting on ice. What is the velocity of the block and arrow just after the collision? How far will the block slide on the ice before stopping? A 7.2N friction force opposes its ...
*April 4, 2015*

**Chemistry**

Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.5g . 1.) What minimum mass of H2SO4 would you need? 2.)What mass of H2 gas would be ...
*March 29, 2015*

**Math**

If someone could help me with this, I would appreciate it! Thanks! Directions: Determine if these two are inverses of one another. A= [ 1 1 1 3 5 4 0 -1 0] A^-1= [ 4 -1 -1 0 0 -1 -3 1 2]
*March 27, 2015*

**social studies**

1.gobi desert 2. Taiwan 3. mountain ranges make much of the region too dry to farm 4. other ethnic groups need a higher birth rate to survive.
*March 18, 2015*

**Physics**

A small wooden block with mass 0.800kg is suspended from the lower end of a light cord that is 1.52m long. The block is initially at rest. A bullet with mass 0.0126kg is fired at the block with a horizontal velocity v0. The bullet strikes the block and becomes embedded in it. ...
*March 12, 2015*

**physics**

Consider a purely inductive ac circuit in which the maximum voltage across the inductor is Vmax=98.0V. If the maximum current is 7.40A at 40.0Hz, what is the inductance L? Answer in mH.
*March 6, 2015*

**physics**

A 39-turn circular coil of wire has a diameter of 1.2m. It is placed with its axis along the direction of the Earth's magnetic field of 58μT at 52° below the horizontal, and then in 0.16s it is flipped 180°. a) What is volts the magnitude of the average ...
*February 28, 2015*

**math**

I want to plot my vertex on a cartesian plane. My question is can i go by different values on the axis? Since my vertex is (1, -64) could i go by 8 on the y axis, and by 1 on the x axis???
*February 25, 2015*

**Science**

An object weighing 90 N has a volume of 45 mL and a mass of 9.0 g. What is its density? a. 0.10 g/mL b. 0.20 g/mL c. 5.0 g/mL d. 10 g/mL
*February 24, 2015*

**Science**

@ Ms. Sue can you check please
*February 13, 2015*

**Science **

1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
*February 13, 2015*

**History**

@ Ms.Sue could you check this please
*February 8, 2015*

**History **

Where is the erie canal located? A- New york B- New Jersey C-Maryland D- Maine Cities grew along railroads and canals because A- the government designed the cities B- workers could not live anywhere else C- settlers could obtain cheap land nearby D- there were not enough roads...
*February 8, 2015*

**vectors **

The minute hand of a wall clock measures 11 cm from its tip to the axis about which it rotates. The magnitude and angle of the displacement vector of the tip are to be determined for three time intervals. What are the (a) magnitude and (b) angle from a quarter after the hour ...
*February 2, 2015*

**geometry**

A child on top of a lighthouse observes two ships that are 90 ft apart from each other. The angles of the depression of the two ships are 34º and 20º. How far is the closest ship from the base of the lighthouse? I'm sorry, I would show my work, I just don't ...
*February 2, 2015*

**Geometry**

A child on top of a lighthouse observes two ships that are 90 ft apart from each other. The angles of the depression of the two ships are 34º and 20º. How far is the closest ship from the base of the lighthouse? I'm sorry, I would show my work, I just don't ...
*February 2, 2015*

**algebra **

The mean on a Advanced Algebra test was 78 with a standard deviation of 8. If the test scores are normal distributed, find the interval about the mean that contains 99.7% of the scores. Use the empirical rule.
*January 28, 2015*

**math**

Mr. Smith’s first period class had an average of 90% on the first test, and his 4th period class had an average of 82%. If there were 30 people in his first class, and 22 in his second, what is the average score of someone in his class?
*January 28, 2015*

**Math**

Invisible braces cost $500 more than metal braces. Metal braces cost $4,800. How muchdo invisibles braces cost?
*January 21, 2015*

**Physics**

Determine the magnitude of the gravitational force Mars would exert on man if he was on the surface of Mars. The mass of the man is 69.0kg . The mass of the Mars is 6.42×1023kg and its radius is 3396 km.
*January 12, 2015*

**language arts**

The young woman Lavinia Lyte sat at last and murmured to herself then to Johnny: "I must talk to toy, Jonathan Lyte tremain" Which of the following best explains why Johnny is so surprised by Lavinia Lyte's statement in this passage? a. Lavinia seems irritable ...
*January 6, 2015*

**language arts**

Which of the following passages from Johnny tremain is most useful in helping you determine what type of ruler general gage is? Select all that apply A. Sam Adams was so happy his hands shook worse then ever B. He was not brilliant but he was no tyrant C. His majesties fleet ...
*December 18, 2014*

**Science-Physics**

A mover is pushing a crate across the floor. He exerts a force of 500 Newtons and pushes the crate a distance of 5 Meters. How much work did the mover do on the crate?
*December 17, 2014*

**algebra**

***I USED A DIFFERENT PROBLEM. FOLLOW THE STEPS!!! The vertex is either the minimum point of the graph of the maximum point of the graph if the equation is a quadratic equation. if it is the minimum point on the graph, than any other point on the graph will be above it. if it ...
*December 17, 2014*

**chemistry**

ok thank you so much
*December 15, 2014*

**chemistry**

is the answer 30?
*December 15, 2014*

**chemistry**

so i would solve for x
*December 15, 2014*

**chemistry**

gasoline sold in ontario must contain at least 5.00% v/v ethanol? How much gasoline contains 1.50 L of ethanol
*December 15, 2014*

**language arts**

Johnny Tremain How does Rab's reaction to Johnny's hand compare to that of other people's? A like others, Rab is horrified B While others react with disgust or pity, Rab ignores the injury until Johnny mentions his band hand C Rab expresses great pity for Johnny&#...
*December 15, 2014*

**language arts**

nope it wasn't c
*December 15, 2014*

**biology**

that doesnt give an exact diagram. most of those diagrams are of other plants
*December 13, 2014*

**biology**

yes. im really stuck as i need to submit it today(online) i already found the leaf structure about my flower. but the root and stem structure is what i am having real difficult finding
*December 13, 2014*

**biology**

no i cant... i really tried to find sites but none explain the stem or the root of this flower.
*December 13, 2014*

**biology**

Explain parts of the stem structure in the lilac flower or a flower similar to the lilac flower
*December 13, 2014*

**chemistry**

A piece of Cu wire is placed into 1.00L of a saturated solution of silver acetate, AgCH3COO. When all the Ag+ has reacted, 2.00g of Cu has been used. A) Write the net ionic equation for this reaction between Cu and Ag+. B) Calculate the Ksp of AgCH3COO. Thank you!
*December 10, 2014*

**language arts**

Sorry yes I do. So is it a?
*December 10, 2014*

**language arts**

which of the following sentences from Johnny Tremain provides evidence that ran is having a positive effect on Johnny? A he liked to make handsome entrance. Even if he had Goblin had dawdled a bit on country roads, they both liked arriving at the inns at a gallop B For the ...
*December 10, 2014*

**language arts**

Which point of view is are the sentences written? It was past dawn when he awoke, his feeling of contentment still in him. He was no longer his own problem but Merchant Lyte's. Tomorrow at this time what would he be calling him? Uncle Jonathan? Cousin Lyte? Perhaps grandpa...
*December 10, 2014*

**Introductory to Physical Science**

i had the same question and someone said a but i do not know why still
*December 9, 2014*

**Science/Math**

oh ok yes that makes sense thank you
*December 9, 2014*

**Science/Math**

explain why?? bobpursley
*December 9, 2014*

**Science/Math **

If a student submerges a stopper with a volume of 6.1mL into a cylinder of thick syrup, what will happen to the syrup?
*December 9, 2014*

**Calculus**

A particle moves along line segments from the origin to the points (3, 0, 0), (3, 3, 1), (0, 3, 1), and back to the origin under the influence of the force field F(x, y, z) = z2i + 5xyj + 4y2k. I have tried multiple times to solve this problem but the answer is still not right.
*December 8, 2014*

**Science**

Suppose that you heated a sample of a hydrated ionic compound in a test tube. What might you expect to see inside the test tube, near the top of the test tube? Explain please i really am stumped on this question...
*December 1, 2014*

**Math**

if f(x) = 2x^2+4 and g(x)=x-3 which number satisfies f(x)= (f o g)(x) A) 3/2 B) 3/4 C) 5 D) 4 I am positive that answer A is correct, i just cant get the work to prove it, i can disprove all other answers and my teacher has assured me i am on the right track, he wants work ...
*November 30, 2014*

**physics**

Your car is stuck in the mud. you have 2 pulleys, rope, and a sturdy tree. ignoring friction how much force can you apply to the car if you are able to pull on the rope with 150lbs of force?
*November 28, 2014*

**chemistry**

3 moles C6H12O6 in 100 ml equals what molarity?
*November 25, 2014*

**Math**

what is the answer to this problem?
*November 21, 2014*

**Math**

Thank you for the answer
*November 17, 2014*

**Chemistry**

oh i get it, it came from the initial... thank you !
*November 12, 2014*

**Chemistry**

why is it 2-2x? isn't it only just -2x?
*November 12, 2014*

**Chemistry**

Consider the following equilibrium: 2HI(g) *are in equilibrium with* H2(g) = I2(g) Keq = 81.0 A 2.00L container is initially filled with 4.00 mol HI. Calculate the [HI] at equilibrium. *I don't know how to put the equilibrium sign on the computer* Can someone please ...
*November 12, 2014*

**Chemistry**

I'm having trouble understanding Boyle's Law and Dalton's law of partial pressures. Can anyone help me work this please? Thank you A sample of propane gas, C3H8, was collected over water at 22.5 ºC and 680. torr. The volume of the wet gas is 3.89 L. What will ...
*November 8, 2014*

**stats**

367.75
*November 4, 2014*

**English: Faulty Coordination**

Thank you Ms. Sue! But does my correction of #1 work? Is it correct?
*October 29, 2014*

**English: Faulty Coordination**

Rewrite the over coordinated sentences that follow, changing clauses into phrases or into single words. where appropriate, break the over coordinated sentence into two sentences. 1. The doctor inserted one end of a long tube into my throat, and she attached the other end of ...
*October 29, 2014*

**Physics**

A figure skater is spinning at a rate of 1.1 rev/s with her arms outstretched. She then draws her arms in to her chest, reducing her rotational inertia to 66% of its original value. What is her new rate of rotation?
*October 26, 2014*

**physics **

A line directed to the west. A plane flies 20 degrees north of that direction ( 90 degrees north of that direction would be north..) if the plane flies for 340 km, determine its displacement toward the west and its displacement toward the north during its flight?
*October 23, 2014*

**math**

The Murphy family just drove 300 miles to visit their grandparents. Mr. Murphy drove 70 mph for 65% of the trip and 35 mph or less for 20% of the trip that was left. Assuming that Mr. Murphy never went over 70 mph, how many miles did he travel at a speed between 35 and 70 mph...
*October 22, 2014*

**Chemistry**

thank you very much!
*October 16, 2014*

**Chemistry**

oh I mean, is 3 a heterogeneous reaction, not 3a. But a gas and an aqueous is a heterogeneous reaction correct? Thanks!
*October 16, 2014*

**Chemistry**

Increasing the surface area will increase the reaction rate in: 1. N2(g) + O2(g) -> 2NO(g) 2. 2Mg(s) + O2(g) -> 2MgO(s) 3. CaCO3(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) + CO2(g) MY WORK: I think it is 2 & possibly 3. 1 is a homogeneous reaction but is 3 a heterogeneous ...
*October 16, 2014*

**Physics**

A car accelerates from rest at 5 m/s2 for 5 seconds. It moves with a constant velocity for some time, and then decelerates at 5 m/s2 to come to rest. The entire journey takes 25 seconds. On a separate sheet of paper, plot the velocity-time graph of the motion. Describe the ...
*September 30, 2014*

**Physics**

You want to use a rope to pull a 12-kg box of books up a plane inclined 30∘ above the horizontal. The coefficient of kinetic friction is 0.29. The rope pulls parallel to the incline. What force do you need to exert on the rope if you want to pull the box with a constant ...
*September 30, 2014*

**college physics**

tennis ball rolls off the edge of a tabletop 0.900m above the floor and strikes the floor at a point 1.60m horizontally from the edge of the table. A: Find the time of flight of the ball B: Find the magnitude of the initial velocity of the ball. C: Find the magnitude of the ...
*September 22, 2014*

**Algebra 1**

the temperature at noon in los angeles on a summer day was 88 degrees fahrenheit. during the day, the temperature varies from this by as much as 7.5 degrees fahrenheit. write and solve an absolute-value inequality to find the range of possible temperature for that day.
*September 11, 2014*

**geometry**

ABCD is a rhombus with diagonals Imported Asset and Imported Asset . Is angle ABD congruent to angle CBD?
*July 7, 2014*

**ashford**

Ruby emailed her instructor a question and he replied to her immediately.
*July 2, 2014*

**math**

That helped. Thankyou Ms.Sue
*June 11, 2014*

**math**

a 15 foot ladder is leaning against a house with the base of the ladder 4 feet from the house. How high up the house does the ladder reach? round to the nearest tenth foot.
*June 11, 2014*

**math**

What is the period, in seconds, of a simple pendulum of length 3 meters? Use the gravitational constant g = 9.8 m/s2 and round your answer to two decimal places Please help! A step by step would with the answer would be helpful!
*June 9, 2014*

**Pre-Calc**

2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) NOTE: I tried to do these myself and got that: a= (4.99,0.27) b=(-1.99,-0.11) Which I know these are wrong, so I don't know how to do ...
*June 7, 2014*

**Chemistry**

A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 24.71 mL to reach a phenolphthalein end point. What is the molarity of...
*June 6, 2014*

**science**

A rock tumbles straight down from a cliff, its moving at 20 m/s when it hits. What is the height of the cliff? The mass of the rock is 8 kg. a) 2.5 m b) 400 m C) 20.4 m d) 160 m
*May 23, 2014*

**physics**

A subcompact car, mass 1,000 kg, runs into and sticks to an at rest, 2,200 kg SUV. If their final speed is 4.7m/s ,what was the smaller cars initial speed? a) 67 m/s b) 30m/s c) 2.2 m/s d) 15 m/s
*May 23, 2014*

**FInite Math**

A car rental agency has rental and return facilities at both Dallas and Austin Airports. Assume that a car rented at either airport must be returned to one or the other airport. If a car is rented at Austin, the probability that it will be returned there is .80; If a car is ...
*May 6, 2014*

**General Chem 2**

Given: Al3+(aq) + 3e– --> Al(s); E° = –1.66 V I2(s) + 2e– --> 2I–(aq); E° = 0.54 V What is ∆G° for the following cell reaction? 2AlI3(aq) --> 2Al(s) + 3I2(s) A) 4.2 × 105 J B) –6.5 × 105 J C) –1.3 × ...
*May 3, 2014*

**algebra**

George has 25 marbles. he wants to divide them into two amounts hat show a ratio of 2:3 how many marbles are in each group?
*April 27, 2014*

**math**

determine the intervals for which the curve r(t)=4sin^3(t)i+7cos^3(t)j is smooth on [0,2π
*April 27, 2014*

**Stats Class HELP!**

Twenty-five blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center. The white blood count (WBC) was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard ...
*April 18, 2014*

**Stats. Class**

a. What sample size would be needed to estimate the true proportion of students at your college who are wearing backpacks, with 95% confidence and and error of +/-0.04? b. What sampling method would you recommend? Why?
*April 18, 2014*

**Stats Class**

The EPA city/hwy mpg range for a Saturn Vue FWD automatic 5-speed transmission is 20 to 28 mpg. If you owned this vehicle, how large a sample (e.g. how many tanks of gas) would be required to estimate your mean mpg with an error of ±1 mpg and 90% confidence? Explain ...
*April 18, 2014*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*April 15, 2014*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*April 15, 2014*

**statistics**

Which of the following percentiles corresponds to the area beneath the standard normal curve from a z score of-3.00 to + 3.00? a. 98% b. 100% c. 95% d. 99.7%
*April 15, 2014*

**statistics**

Jorge finds that his standardized z score on an IQ is 2.0. What percentage of people did he score higher than? a. 98 b. 96 c. 68 d. 34
*April 15, 2014*

**math**

A jar of coins has only nickels and quarters, which are worth a total of $3.25. There are 5 fewer quarters than nickels. How many quarters and nickels are in the jar?
*April 14, 2014*

**Chemistry**

Based on the mechanisms that you have determined and the information in the introduction, what is the product of 1-cholorobutane after reaction under the sodium iodide conditions? The ethanolic silver nitrate conditions?
*April 14, 2014*

**9th grade math**

Ok, trent, so if solving for m use this formula: (Google quadratic formula to see formula) so, -b should be 24, b^2 should be -24^2, a should be 4 and c should be 36. The answer should be m=3. -------But if you are to foil this, then 4m^2-24m+36 will be (4m-12)(m-3).
*April 8, 2014*

**Chemistry**

For a reaction that has an equilibrium constant of 9 × 10–9, which of the following statements must be true? A) ∆G° is positive. B) ∆G° is negative. C) ∆H° is negative. D) ∆H° is positive. E) ∆S° is positive.
*April 6, 2014*

**Chemistry**

The standard enthalpy of fusion of iodobenzene is 9.75 kJ/mol at its melting point, 241.8 K. What is the standard change in entropy for the melting of iodobenzene at its melting point? A) –9.75 J/(mol • K) B) –311 J/(mol • K) C) 0.0403 J/(mol • K) D) ...
*March 31, 2014*

**Chemistry**

The presence of ammonia in a solution of AgCl will decrease the solubility of AgCl. True Or False
*March 31, 2014*

**physics**

is it d = 1/2 (9.8) (3)^2 = 44.1 m/s^2/3s =14.7 m/s x 2 = 32.87 = 32.87 mi/h? and b) d= 1/2 (9.8) (3)^2 =44.1 m/s^2/35 = 14.7 m/s
*March 30, 2014*

**physics**

a student drops an object out the window of the top floor of a high-rise dormitory a) neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 3.0 s? express the speed in mi/h for a familiar comparison, b) how far, in meters, does ...
*March 30, 2014*

**physics**

does this change the answer... the ball is dropped from the top of an 80-m-high building. does the ball reach the ground in 4.0 s? I got no, it falls only 78 m in 4.0 s What speed does the ball in the first question have in falling 3.5 s?
*March 30, 2014*

**physics**

a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?
*March 30, 2014*