Wednesday
April 16, 2014

Posts by Sarah


Total # Posts: 3,747

CHEMISTRY
The enthalpy of neutralization for the reaction of a strong acid with a strong base is −56 kJ/mol of water produced. How much energy will be released when 198.5 mL of 0.400 M HCl is mixed with 150.1 mL of 0.500 M NaOH?

CHEMISTRY
Consider the following cyclic process carried out in two steps on a gas. Step 1: 41. J of heat is added to the gas, and 20. J of expansion work is performed. Step 2: 60. J of heat is removed from the gas as the gas is compressed back to the initial state. Calculate the work fo...

CHEMISTRY
In a coffee cup calorimeter 70.0 mL of 0.100 M AgNO3 and 70.0 mL of 0.100 M HCl are mixed to yield the following reaction. Ag+(aq) + Cl ‾(aq) → AgCl(s) If the two solutions are initially at 22.60°C, and if the final temperature is 23.39°C, calculate ΔH...

social studies
Different labor systems and cultures predominated in various regions of British America. How did the economy of each region help determine its labor systems and customs?

Physics
The mass of a rocket car plus fuel is 2,000kg. The rocket car starts from rest. The engine expels fuel(in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000m/s due west, and the velocity of the rocket car after 8 seconds is 90m/s due east. How...

dressmaking
Thanks for the help

dressmaking
A houndstooth(black and white plaid) jacket would work well with which of the following bodylines? A) Straight B)Soft-straight C)Soft-curved D)curved Im thinking it could be A or B.Need help for this question

Statistics
The author’s of the article “Perceived risks of Heart Disease and Cancer Among Cigarette Smokers” expressed the concern that a majority of smokers do not view themselves as being at increased risk of heart disease or cancer. Because of this, the authors call for...

Physics
a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...

Physics
The mass of a rocket car plus fuel is 2,000kg. The rocket car starts from rest. The engine expels fuel(in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000m/s due west, and the velocity of the rocket car after 8 seconds is 90m/s due east. How...

Physics
In an unusual return to space, Astronaut Sally Ride is conducting repair work on the Hubble Space telescope. She throws a hammer of mass 500.0g forward at 20.0m/s. The astronaut, mass 80.0kg, recoils in the opposite direction. What is Sally's recoil velocity?

Physics
Philadelphia Flyers player Mike Richards stands on the frictionless ice next to the goal. Neither Mike nor the goal are anchored to the ice. Frustrated after a recent playoff loss, 102.5kg Mike suddenly pushes on the goal, sending it across the ice a 2.80m/s. Mike recoils in t...

Physics
after an ice show, Michelle helps clear the props from the ice. Standing in her skates next to a potted artifical tree, she gives it a push. The tree, which has a mass of 6500g, slides forward at a velocity of 13m/s. Michelle, with a mass of 40.0kg, slides in the opposite dire...

Physics
a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...

Economics
You bought the bond for $1,040, after 6 months you received a coupon of $35 and after another 6 months you received another $35 coupon and you sold the bond for $1,070. What would be your total dollar return in that case? What would be your total percentage return? Would the t...

Math
You bought the bond for $1,040, after 6 months you received a coupon of $35 and after another 6 months you received another $35 coupon and you sold the bond for $1,070. What would be your total dollar return in that case? What would be your total percentage return? Would the t...

Math-helpppppp
1)when a certain polynomial is divided by x - 3, the quotient is x^2+2x-5 and the remainder is -3. what is the polynomial 2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29x-x^3-40)/(-3+x) b)(6+7x-11x^2-2x^3)/(x+9) c)(x^3-2x^2+4x+150/(x^2+...

Math--help help help
1)when a certain polynomial is divided by x - 3, the quotient is x^2+2x-5 and the remainder is -3. what is the polynomial 2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29x-x^3-40)/(-3+x) b)(6+7x-11x^2-2x^3)/(x+9) c)(x^3-2x^2+4x+150/(x^2+...

Sociology
How would eating disorders factor into the media/cultural aspect of sociology? Would they be considered an unintentional/long term media effect?

Physics
a 65-kg ice skater moving to the right with a velocity of 2.50m/s throws a .150kg snowball to the right with a velocity of 32.0m/s relative to the ground a) what is the velocity of the ice skater after throwing the snowball? b) a second skater initially at rest with a mass of ...

Physics
a 78kg hockey player standing on frictionless ice throws a 6.0kg bowling ball horizontally with a speed of 3.0m/s. With what speed does the hockey player recoil?

Physics
a space-satellite mass of 600kg fires a rocket engine for 2 seconds expelling 40kg of exhaust gases at 350m/s. By how much will the speed of the capsule change? You may consider the initial relative velocities to be zero, but would it matter?

Physics
a 3.5kg rifle fires a 5gram bullet with a muzzle speed of 300m/s. What is the recoil speed of the rifle?

Physics
A 24-ton freight car rolls along a straight track with a speed of 10mph. A 2.0 ton automobile falling vertically lands on the freight car from above. a) what is the speed of the freight car after the car lands on it? b) the car then rolls sideways off the freight car. What is ...

Physics
a 10,000kg boxcar rolling west at 60mph collides with an empty tanker of mass 7000kg sitting at rest on the track. The cars attach and continue to roll west on the track. What is the speed of the connected cars?

Physics
a diatomic molecule of oxygen traveling at 330m/s collides head on with a carbon dioxide molecule going 270m/s. The oxygen molecule bounces off the carbon dioxide molecule in the opposite direction going 365m/s. What is the speed and direction of the carbon dioxide molecule? (...

Physics
two carts with masses of 10.0kg and 2.5kg move in opposite directions on a frictionless track, with speeds of 6.0m/s and 3.0m/s respectively. The carts stick together after colliding head on. Find the final speed of the two cars

Physics
A 5-gram bullet going 200m/s hits a 40-gram "tin can" resting on a fence post. The bullet passes through the can emerging with a speed of 160m/s in the same direction. How fast, in the same direction, does the can go after the bullet has passed through.

geomitry
what measure is formed by the hands of a clock at 5:00

psychology
How is the experience of emotion related to engaging in health-promoting behaviors such as exercising and recreational sports? a) Negative emotion increases health-promoting behaviors. b) Positive emotion increases health-promoting behaviors c) Positive and negative emotions h...

English
In the sentence The trainer, armed with a whip, entered the cage. I think I have it right, but am not sure. I have entered as the participle, armed with a whip as the modifier and no object of the participle. Is this correct?

Physics
A(n) 0.187 kg baseball is thrown with a speed of 29 m/s. It is hit straight back at the pitcher with a final speed of 22.3 m/s. What is the magnitude of the impulse delivered to the ball? Answer in units of kg · m/s

Biology
What does follicular activity mean?

mosinee
First you take 1,009.88 and subtract 130. that'll give you 879.88. then you add 6.19to that number and there's your answer

Biology
I am analyzing a scientific article for my biology class. I am trying to comprehend all of the terms used and am hoping I can gain other's insight as to where this article is flawed and what could have been done to improve it. The article is titled: Effect of age and coast...

chemistry
The molal boiling point constant (Kb) for water is ).51oC/m and the molal freezing point constant (Kf) for water is 1.86oC/m. Given this information here is the question... If I pour 25 mL of 0.035 M NaOH into 975 mL of water, what is the new concentration of NaOH?

Chemistry
At 50 degrees, 100 grams of water is saturated with cerium (III) sulfate. How many grams of cerium (III) sulfate must be added to saturate the solution at zero degrees celsius?

Chemistry
If 30 grams of KCl is dissolved in 100 grams of water at 40 degrees celsius, how many additional grams of KCl would be needed to make the solution saturated at 80 degrees celsius?

CHEMISTRY
A student calibrates his/her calorimeter. S/he performs part 1 as instructed. The data are: 99.2 g water at 36.0°C are added to 97.3 g water in the calorimeter at 16.0°C. The final temperature is 26.0°C. Calculate the heat capacity of the calorimeter in J/°C.

biology
how can you identify gasses released by plants and animals

Math
If i had a 65% in a course now, and i need a 70% to pass, What will i need to get on my final exam worth 25% to pass the course?

CHEMISTRY
A student calibrates his/her calorimeter. S/he performs part 1 as instructed. The data are: 99.2 g water at 36.0°C are added to 97.3 g water in the calorimeter at 16.0°C. The final temperature is 26.0°C. Calculate the heat capacity of the calorimeter in J/°C.

CHEMISTRY
Suppose 1400 J of heat energy are put into a sample of liquid water at 23°C, and the final temperature of the water is 78°C. How many grams of water are present?

Math
If i had a 65% in a course now, and i need a 70% to pass, What will i need to get on my final exam worth 25% to pass the course?

Chemistry
If the literature value for the ΔHfus of water is 6.01 kJ/mol, how many kJ of heat energy would be required to completely melt 130 g of ice at 0°C?

physics
oh you meant in the question, sorry they didn't copy over!

physics
what units were missing? I see units on all my numbers. I found it though, I just had to divide my radius in half... although I do not know why!

physics
If a 80 lightbulb emits 4.0 of the input energy as visible light (average wavelength 550 ) uniformly in all directions, estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an observer 3.0 away. 1. I found the energy of photo...

us history
what was James L. Farmer, Jr. political and religious views?

math
wtf none of your beess wax

math
A map has a scale of 1/2 inch to 4 miles. The shortest distance between two cities on the map measures 8 inches. If d represents the shortest distance between the two cities, what is d?

physics!
The far point of a nearsighted person is 5.8 m from her eyes, and she wears contacts that enable her to see distant objects clearly. A tree is 18.7 m away and 1.8 m high. (a) When she looks through the contacts at the tree, what is its image distance? (b) How high is the image...

Math
A bag of marbles contains 5 red, 12 blue and 5 yellow. What is the ratio of red marbles to non red marbles?

Finance
Jungle, Inc. has a target debt-equity ratio of 0.72. Its WACC is 11.5 percent and the tax rate is 34 percent. What is the cost of equity if the aftertax cost of debt is 5.5 percent?

kinesiology
what joint does splenius muscle cross?

psychology
What is concepts of reliability and validity as they pertain to psychological testing? I have a test comming up and I am confused by the concepts of reliability and validity as they pertrain to psychological testing. Can someone explain this to me? thank you!

psychology
Mike waits until the night before his big exam to start studying. He maintains that last minute cramming keeps the information fresh in his memory. What does connectionist network research tell us about the effectiveness of cramming? a)It is very effective because the informat...

Physics
An alpha particle, initially moving at a speed of 7.10x10^5m/s, goes through a potential difference of 2500V. Determine the final speed of the alpha particle. Answer: 8.64 x 10^5

Physics
The sound from a mosquito is produced when it beats its wings at the average rate of 559 wing beats per second. What is the wavelength of the sound?

Ap chem
When 80.4 moles of calcium acetate are dissolved in enough water to make 222.2 milliliters of solution, what is the molarity of acetate ions? Answer in units of M I already tried moles/liter and it was wrong

World History
Why were the cash economies introduced by the Europeans unsuitable for African countries?

physics
A bullet of mass 12.4 g is fired into an initially stationary block and comes to rest in the block. The block, of mass 1.02 kg, is subject to no horizontal external forces during the collision with the bullet. After the collision, the block is observed to move at a speed of 4....

geometry
a person is standing 12m away from a street light that is 9m tall. How tall is he if his shadow is 3m long?

physics
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.90 10-10 T. The wave passes perpendicularly through an open window, the area of which is 0.20 m2. How much energy does this wave carry through the window during a ...

physics
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.7 x 10^-6 T. What is the intensity S of the wave?

Physics help!
Suppose that a police car on the highway is moving to the right at 26 m/s, while a speeder is coming up from almost directly behind at a speed of 37 m/s, both speeds being with respect to the ground. The police officer aims a radar gun at the speeder. Assume that the electroma...

child psychology
Mishel's research shows that --------- is especially important in teaching children to delay gratification and resit temptation. A. the desire-theory of mind B.diverting attention C.perspective taking D.reinforcing I think its C, am I correct please help

child psychology
what is the only emotion that males express freely than females in every day interaction A.anger B.Sorrow C.Embarrassment D.Envy I think it is A but not sure because at time girls are the more aggresive ones. please help

child psychology
Parents of impulsive children can foster conscience development by building a a warm affectionate relationship the promotes A. secure attachment B.ego development I stongly believe its A please help

child psychology
Typically when paired with a boy in a laboratory play session, a two year old girl is likely to A. stand idly while the boy explores the toy B.assume domineering behavior, telling him what to do C.actively explore the surroundings D.play cooperatively with the boy I think its ...

child psychology
A parent who uses imperitives and specifit suggestions in everyday life is most likely the parent of A.son B.daughter C.teenager D.son and a daughter I think its C but not sure because teenagers dont have time to listen

child psychology
I still need help with this question Which young adult is at risk of long term identity foreclosure or diffusion? A. A college graduate who switces majors B. An aspiring chef who has no opportunity for culinary training. C.A young woman with several possible vocational choices...

child psychology
Do you suggest it is A Thanks

child psychology
Dean associates certain activites,roles, and traits as being typical for either males or females.His associations conform to cultural stereotypes and encompass many gender-linked responses.This is an example of gender: A.atypicality B.roles C.typing D.identity I think its B or...

child psychology
I strongly believe it is A

child psychology
which young adult is at risk of long-term identity foreclosure or diffusion A.An aspiring chef who has no ooportunity for culinary training. B. A peace corps volunteer.

Math
JJ's boat will go 15 mph in still water. If he can go 12 mph downstream in the same amount of time it takes to go 9 mph upstream, what is the speed of the current?

kinesiology
how would you ensure proper development of the antagonist muscles at the elbow joint? please explain

us history
Which factor, self-interest or idealism, was more important in driving American foreign policy in the years 1895-1920?

child psychology
Dean associates certain activities,roles,and traits as being typical for either males or females.His associtions conform to cultural stereotypes and encompass many gender-linked responses.This is an example of: A.roles B.Identity C.Atypicality I think its B. Am I correct Thanks

child psychology
which young adult is long-term identitity foreclosure or diffusion A. college graduate who switches majors B.An aspiring chef who has no opportunity for culinary training. C.A young woman with several possible vocational choices. D.A peace corps volunteer. My choice is D. Am I...

CHEMISTRY
Rank the following complex ions in order of increasing wavelength of light absorbed. (Use the appropriate <, =, or > symbol to separate substances in the list.) Co(H2O)63+, Co(CN)63-, CoI63-, Co(en)33+

physics 30
An alpha particle moving at a speed of 5.20x10^4 m/s enters a perpendicular magnetic field with a strength of 3.0 mT. The magnitude of the acceleration of the particle as it enters the magnetic field will be a.bcx10^d m/s^2 ?

physics 30
A current-carrying conductor that is 8.00x10^-2 m long is placed perpendicular to a magnetic field that has a strength of 6.00x10^-3 T. During a 3.00s time interval, 7.50x10^19 electrons pass a point in the conductor. The magnitude of the average magnetic force exerted on the ...

physics 30
A charged particle with mass m, and a charge q, is moving through a perpendicular magnetic field of strength B at a velocity,v. The particle is deflected through a curved path with a radius of 15.0 cm. If the speed of the same particle is doubled and the magnetic field is incr...

physics 30
An electron that has a distance of 10.0 cm , is accelerated from rest through a potential difference of 4.50 kV before it enters a region between perpendicular elecric and magnetic fields. The electron moves into a region between positively charged plate and a negatively charg...

physics 30
Draw a scenerio with a magnet and the solenoid below that would induce a flow of electrons to the right of the page in the ammeter, as shown below.

physics 30
A magnet dropped through a vertical solenoid will fall at a rate that is slower than gravity, and will induce an electric current within the solenoid. which physics principle explain these phenomena ?

Math
Let csc(x)=-3. Find all possible values of sin(x)+cos(x) ------------- sec(x)

childhood education
The goal of Binet and Simons original intelligence test was to: A.develop an objective method for assigning students to special classes. B.determine the underlying mental abilties associated with intelligence. My choice is A.Is it correct? thanks

Momentum Physics
31.3

child psychology
Connectionists models provide evidence that? Please help!

CHEMISTRY
Rank the following complex ions in order of increasing wavelength of light absorbed. (Use the appropriate <, =, or > symbol to separate substances in the list.) Co(H2O)63+, Co(CN)63-, CoI63-, Co(en)33+

geometry
Determine the name of the quadrilateral that fits the given property. Only one pair of opposite sides is parallel. This quadrilateral is a _________. A. kite B. rectangle C. rhombus D. square E. trapezoid

algebra
At what interest rate would a deposit of $45,000 grow to $110,682 in 30 years with continuous 38) compounding?

CHEMISTRY
What is the electron configuration for the transition metal ion(s) in each of the following compounds? Na2[TaF7] Cant seem to figure this one out...

health
if you were going to leave your home and your kids put you to aged care facility how would you feel and how would you think and what would you miss the most

childhood education
Which factors seem to be most important for development of make-believe play. A. children's readiness to engage in make- believe play and social experiences that promote it. B.opportunities for peer interaction in settings that inspire make-believe play.

child psychology
Piagets famous -----------problem demonstrates preoperational children's difficulity with---------- A. three mountains; dual representation B.three mountains;hierarchical classification. C. class inclusion; hierarchial classification

Math
How do you list 2/3,1/2,1/3,3/4,1/8 from least to greatest?

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