Wednesday
February 10, 2016

# Posts by sydney

Total # Posts: 422

physics
A 10.7 g mass is attached to a horizontal spring with a spring constant of 12.6 N/m and released from rest with an amplitude of 37.8 cm. What is the speed of the mass when it is halfway to the equilibrium position if the surface is frictionless?
February 9, 2016

precal
She doesn't know the exact route to her friends house. She knows that the route is 3 blocks to the first turn, 2 blocks to the second turn and then 1 block further. She can walk east, west or north when she leaves school and the blocks are 1/8 mile long. What is the ...
February 5, 2016

algebra/precal
If a minute hand traveled at an average of 1 mph at the tip... how long in get would the minute hand have to be?
February 4, 2016

maths
6m is equal to 600cm divided by 20 cm= 30 boxes
February 4, 2016

algebra
wow your a genius! yeah I have no idea either... one more question :) how would you solve backwards to find length of the minute hand if the average speed was 1 mph?
February 4, 2016

algebra
A clock has a minute hand that is 14 feet long and an hour hand that is 9 feet long. What is the average speed (in mph) of the tip of the minute hand no idea how to solve this... please help :)
February 4, 2016

chemistry
Total Pressure= PressureA + PressureB..... when you add .150 mol you have to find pressure using PV=nrT sooooo.... P(7.30)=(.150)(.08206)(318) for P=.536 where n is moles, r is a constant and T is in kelvin... now add up all the Pressures Ptotal= .410+.620+.536= 1.566
February 4, 2016

Ap US History
Why would former slaves and Radical Republicans describe the state of affairs following the Compromise of 1877 as “worse than slavery”? Support, refute, or modify this claim using historical evidence. i just need help starting this paper and i also don't know ...
January 31, 2016

APUSH
Hi this is my essay prompt for APUSH. I am a little confused about this prompt. I don't really know where to start. Also I'm not sure what my 3 body paragraphs should be about. If you could help me with this it would be great. Thank you Sydney Why would former slaves ...
January 26, 2016

Math
20 + 25 = m
January 5, 2016

physics
A 2kg rock is thrown downward from a height of 3 meters with an initial velocity of 4 m/s. Just before it hits the ground its speed is _____.
November 3, 2015

Chemistry: gas law
Can you give me the answer so I can try and work backwards. I'm really lost. you don't need to show the steps now that i have the process, I'll get there i just want to know if i get the answer right
October 23, 2015

Chemistry: gas law
@Steve Moles of CO2 and H? once I find the moles do I use PV=nRT --> V=nRT/P?
October 23, 2015

Chemistry: gas law
I'm here at a study group with Aaron and while he's stuck on that question, I'm stuck on this one... I think we're gonna take a break but I'd love if someone could help break this down for me. Carbon monoxide, CO, and hydrogen, H , react according to the ...
October 23, 2015

AP US History
Hey mrs sue this link is not working
October 22, 2015

AP US History
Adams was an accomplished patriot who was instrumental in establishing the United States and its government. However, many people believed that the Adams administration was a setback, and that his presidency did more harm than good to the new nation. Was this an accurate ...
October 22, 2015

Math
Aba +bab ______ Ccc All posible values for a b and c
October 12, 2015

ap history
I got E again is that correct
September 23, 2015

ap history
36. Which of the following statements about Virginia is correct? [a The indentured servants’ chances of upward social mobility improved in the second half of the 1600s. [B] By 1640 the great majority of its plantation laborers were African slaves. [C] It was dominated by ...
September 23, 2015

AP History
I got C is that correct
September 23, 2015

AP History
Which of the following statements about the slave trade that developed from the fifteenth century onward is correct? AThose sold into slavery by African kings were primarily undesirables such as lawbreakers or persons accused of witchcraft. [B] Slavery already existed in West ...
September 23, 2015

science
I had objects that I had to find the source energy then what it was converted to. Please check my answers: battery Powered Drill chemical--> mechanical and thermal Lava Lamp Electrical--> thermal and nuclear
September 15, 2015

No because intention is the base word. So there is no prefix.
September 15, 2015

Science Energy
My assignment was to give drawn examples of the 7 forms of energy. I am having trouble with Chemical and Nuclear. My science teacher used a plant as an example for chemical energy but I don't know what she meant. Also I can't think of an example for nuclear. Would a ...
September 15, 2015

Math (Ratios)
Ok thanks,
September 3, 2015

Math (Ratios)
Ok, I already know how to work ratios, but I'm confused on this question: Jessica had 3 pairs of tennis shoes and 3 pairs of sandals, What is the ratio of tennis shoes to sandals Jessica owned? Pair means 2 right? So would it mean 6 tennis shoes to 6 sandals? Or 3 tennis ...
September 3, 2015

chemistry
August 25, 2015

Chemistry
Can you please help me write the oxidation and reduction half reactions represented in each of these redox equations, and help me write the half reactions in net ionic form if they occur in aqueous solution. 1) PbO(s) + NH3(g) --> N2(g) + H2O(l) + Pb(s) 2) I2(s) + Na2S2O3(...
August 24, 2015

chemistry
/Users/Sydneyvanalphen/Desktop/Screen Shot 2015-08-18 at 3.21.30 PM.png hi i need help with this homework problem I don't get how they are getting the answer 75?
August 18, 2015

Chemistry
All Brønsted-Lowry acids A. are aqueous solutions. B. can act as Arrhenius acids. C. donate protons. D. all of the above I got C but could it be D?
August 15, 2015

Chemistry
Can you please explain to me how you would regulate the pressure to favor the products in the this equilibrium system. MgCO3(s)--><-- MgO(s)+CO2(g) Thank you
August 11, 2015

Chemistry
Can you please explain to me how you would regulate the pressure to favor the products in the this equilibrium system. MgCO3(s)--><-- MgO(s)+CO2(g) Thank you
August 11, 2015

chemistry
can you please explain to me why a common ion lowers the solubility of an ionic compound
August 10, 2015

algebra 1
How many solutions are there to the system: y=1+2x+x^2 y=1-x Write your answer as an integer.
August 8, 2015

algebra
Suppose Paul kicks a soccer ball straight up into the air with an initial velocity of 96 feet per second. The function f(x) = -16t2 + 96t gives the height, in feet, of the soccer ball after t seconds.Show all work to find the axis of symmetry algebraically. You must show all ...
August 7, 2015

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

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

Chemistry
A= ejected B=1->3 C=not absorbed D=1->2
March 19, 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

HELP
Aba +bab --------- Ccc All posible values for all
February 23, 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

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

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