Friday

July 25, 2014

July 25, 2014

Total # Posts: 239

**Chemistry**

Which of the following results from the presence of a solute in a given solvent? A. The vapor pressure of the solution is lower than that of the pure solvent. B. The boiling point of the solution is lower than that of the pure solvent. C. The freezing point of the solution is ...

**Chemistry**

that makes sense thank u!

**Chemistry**

If the solubility of a gas in water is 1.22 g/L at 2.75 atm, what is its solubility (in g/L) at 1.0 atm? A. 0.44 g/L B. 3.97 g/L C. 2.25 g/L D. 3.36 g/L I think the answer is C.. i did 2.75 x 1.0 = 2.75 / 1.22 = 2.25 but people say the answer is A... why? i think the answer is...

**Chemistry**

A sample of H2 is collected over water such that the combined hydrogen–water vapor sample is held at a pressure of 1 standard atmosphere. What is the partial pressure of the H2 if that of the water vapor is 2.5 kPa? A. 103.8 kPa B. 98.8 kPa C. 2.5 kPa D. 101.3 kPa B or C???

**Chemistry**

Calculate the molarity of 17.g of NaCl in 881 ml of solution

**chemistry **

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0210 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? Ksp=1.20×10^–5 silver sulfate ksp=4.93x 10 ^-5 calcium sulfate

**Math!!!!**

thanks!!! i will ask some more later(:

**Math!!!!**

y-(-3)= -1/2(x-(0)) How do you solve this equation and graph?????

** Math**

The names, or notes, of all the white keys on a piano are written on pieces of paper and placed in a cup. There are 7 sets of the notes D, E, F, and G and 8 sets of the notes A, B,and C. If a person draws one note out of the cup without looking, what are his or her chances of ...

**chemistry**

if you had 0.028 moles of copper sulfide, how many grams would you have?

**Multiple Choice HELP!**

What is a counterexample for the conjecture? Conjecture: The product of two positive numbers is greater than the sum of the two numbers. A. 3 and 5 B. 2 and 2 C. A counterexample exists, but it is not shown above. D. There is no counterexample. The conjecture is true. I think ...

**Science URGENT**

Hi, I am working on stoichiometry and limiting reactant problems. I have worked through examples in my book and I did them right and can solve for the excess, however there is one problem in the book that has confused me. I don't understand why they identified the limiting...

**Science--Please Help!**

Someone please explain this to me. I thought the smaller number is the limiting reactant but it appears its not the case here.

**Science**

Hi, I am working on stoichiometry and limiting reactant problems. I have worked through examples in my book and I did them right and can solve for the excess, however there is one problem in the book that has confused me. I don't understand why they identified the limiting...

**History Help!**

What were the key aspects of Lyndon B. Johnson’s Great Society? *Can you please send me a link to find this information! thank you!!

**History Multiple Choice**

Why did slavery continue after the Revolution? A. Slave labor was important to the New England economy. B. The colonial government encouraged manumission. C. British, Loyalists, and Patriots all agreed that liberty did not extend to slaves. D. The Southern plantation economy d...

**History Multiple Choice**

One of the Patriots’ greatest strengths was their A. reliance on local militia. B. well-trained soldiers. C. superior troop numbers. D. persistence in fighting. Is ir B?????????

**Government**

Journalist Walter Lippmann suggested that Question 18 options: 1) polling, even when done scientifically, cannot be trusted because it is in people’s nature to be dishonest in response to political questions. 2) the dominance of polling has brought about an ideological sh...

**Chemistry**

What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?

**math**

Wrong

**Pre-Algebra**

NEVER MIND 0-0

**Pre-Algebra**

*CRY* *CRY*

**Pre-Algebra**

MS.SUE MS.SUE?????!!!!???!!

**Pre-Algebra**

Hello ???????????

**Pre-Algebra**

Ms. Sue ?

**Pre-Algebra**

5) b 2) a 3) d

**Pre-Algebra**

Please help Please help please help me with my homework !!!!!! :( :( :( :( *sad*

**Pre-Algebra**

1) Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,256 ft2 b. 4,189 ft2 c. 1,089 ft2 d. 1,568 ft2 2) Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,257 ft3 b. 4,187 ft3 c. 1,089...

**Statistics **

Suppose. Population of test-scores is normally distributed with mean 65 and standard deviation 13 x~n (65,13) if you select a test at randome what is the probability that the score is below 60 or that it is between 65 and 70 please show work!

**Geometry**

1) If m1 = 37°, what is the measure of 4? a. 53° b. 43° c. 37° d. 27° 2) If m1 = 40°, what is the measure of 5? a. 50° b. 40° c. 35° d. 25° 3) If m4 = 105°, then what is the m8? a. 105° b. 75° c. 175° d. 25° My Answer...

**math pls help Ms Sue**

its right

**Physics**

A 50 kg skater at rest on a frictionless rink throws a 2 kg ball, giving the ball a velocity of 10 m/s. Which statement describes the skaters subsequent motion? Explain please. a. 0.4 m/s in the same direction as the ball. b. 0.4 m/s in the opposite direction of the ball. c. 2...

**math**

Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the x-axis

**Science**

Connective tissue wraps around to protect the organs, store nutrients, attach muscles and bones, are found in deep layers of skin to give it strength. On the other hand, nerve tissue conduct impulses to and from organs via neurons. They are mainly found in the spinal cord, bra...

**physics**

a) Gravitational potential energy = mgh = (106kg)(10m/2^2)(1.96106m) = 2078.7236 J b) F = ma = (10kg)(10 m/s^2) = 100 N

**math**

n!/r!(n-r)! 8!/4!(8-4)! = 70

**Math**

The equation would be 2x + 3.50 = 30.50. Basically, x represents the shirts and since there are two shirts, we multiply x by 2. $3.50 is added because one shirt is $3.50 more than another. Isolate the variable. Subtract 3.50 from 30.50 which would equal 27. Then, divide 2 from...

**Physics**

Block A of mass 2.0 kg and Block B of 8.0 kg are connected by a spring of spring constant 80 N/m and negligible mass. The system is being pulled to the right across a horizontal frictionless surface by a horizontal force of 4.0 N, with both blocks experiencing equal constant a...

**math**

37 and 5

**Physics**

Use Poiseuille's Law, and sub rho*g*h for (P2-P1)

**Physics**

Water (η = 1.00E-3 Pa*s) is flowing through a horizontal pipe with a volume flow rate of 0.0120 m3/s. As the figure below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0421 m and L = 0.706 m. Calculate the radius of the horizontal pipe.

**Spanish Beg. 1 - help (anyone???)**

Most nouns ending -o and -os are masculine.Most nouns ending in -a and -as are feminin.

**Chemistry**

Calculate the volume of oxygen you would need, at 1.00 atm and 298 K, to completely oxidize 51g of glucose.

**chemistry**

1. How many grams of NaCl are present in 15 mL of a 2.0% solution?

**algebra 2**

Samantha needs to solve the equation x2 - 12x = 40. What must she do to each side of the equation to complete the square?

**algebra 2**

Samantha needs to solve the equation x2 - 12x = 40. What must she do to each side of the equation to complete the square?

**Biology**

to grow larger, arthropods must A grow a new endoskeleton. B grow a new exoskeleton. C add to the old endoskeleton. D add to the old exoskeleton. is it B?

**Biology**

Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks

**Geography**

Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks

**Physics**

Volume of 1200 L of helium at 4000 Pa is heated from 45.0°C to 75.0°C increasing the pressure to 6000 Pa. What is the resulting volume of gas?

**Math **

determine whether the ordered pair is a solution; 6y-3x=-9,(1,-1) and 5y-2x=15 Also 2x+5y=-15

**Geometry**

4. Plots of land between two roads are laid out according to the boundaries shown. The boundaries between the two roads are parallel. What is the length of Plot 3 along Cheshire Road? 46 yards 67 yards 66 yards 37 yards

**Math**

the short side of an isosceles triangle is 16cm long increasing each side length by 24cm doubles the perimeter. how long are the other sides of the original triangle?

**math**

A person who looks at a sequence of 14, 12, 10, 8 and decides that the next two terms are 6 and 4 is doing deductive thinking. True False

**calculus**

Find an equation of the tangent line to the curve at (8,0). y=ln(x^2 -8x +1)

**chemistry**

How many Moles of H are in 2.20 moles of H3PO4? and how do you figure that out? Thanks!

**physics**

A block accelerates at 3.3 m/s^2 down a plane inclined at an angle of 26 degrees.Find micro(k) between the block and the inclined plane. The acceleration of gravity is 9.81 m/s^2. This is my work but i am not sure if it is correct: sum of forces on x axis= -kinetic friction + ...

**physics**

Consider a 626N weight held by two cables. The left hand cable had tension T and makes an angle of theta with the wall. The right hand cable had tension 720N and makes an angle of 27 degrees with the ceiling. What is the tesion T in the left hand cable slanted at an angle of t...

**physics**

On take off, the combined action of the engines and wings of an airplane exerts a(n) 7767 N force on the plane,directed upward at an angle of 59.1 degrees above the horizontal. The plane rises with constant velocity in the vertical direction while continuing to accelerate in t...

**physics**

On take off, the combined action of the engines and wings of an airplane exerts a(n) 7767 N force on the plane,directed upward at an angle of 59.1 degrees above the horizontal. The plane rises with constant velocity in the vertical direction while continuing to accelerate in t...

**physics**

A child learns in school that the earth is traveling faster than 100,000 kilometers per hour around the sun, and in a frightened tone asks why we arent swept off. What statement about the motion of the Earth is, on average,true? A. We are traveling slower than the Earth B. We ...

**physics**

A block of a mass of 1 kg rests on the inclined surface of a wedge of a mass of 2.2 kg. The wedge is acted upon by a horizontal force F and slides on a frictionless surface. The acceleration of gravity is 9.81 m/s^2. If the coefficient of static friction between the wedge and ...

**physics**

A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 845 N. As the elevator moves up,the scale reading increases to 940N,then decreases back to 845N. The acceleration of gravity is 9.8 m/s^2. Find the acceleration of the ...

**physics**

You hit someone with a force of 173N. How much force is exerted on you? Answer in units of N.

**physics**

A locomotive pulls a series of wagons. Which is the correct analysis of the situation? A. because action always equals the reaction,the locomotive cannot pull the wagons,-the wagons pull backward just as hard as the locomotive pulls forward, so there is no motion. B. The train...

**physics**

Consider a 626N weight held by two cables. The left hand cable had tension T and makes an angle of theta with the wall. The right hand cable had tension 720N and makes an angle of 27 degrees with the ceiling. What is the tesion T in the left hand cable slanted at an angle of t...

**physics**

The horizontal surface on which the block of mass 4 kg slides is frictionless. The force of 30N acts on the block in a horizontal direction and the force of 60N acts on the block at an angle. What is the magnitude of the resulting acceleration of the block? The acceleration of...

**physics**

A 4.1 kg object hangs at one end of a rope that is attached to a support on a railroad beoxcar. When the car accelerates to the right,the rope makes an angle of 37 degrees with the vertical. The acceleration of gravity is 9.8 m/s^2. Find the acceleratino of the car ( hint: a o...

**physics**

A block accelerates at 3.3 m/s^2 down a plane inclined at an angle of 26 degrees.Find micro(k) between the block and the inclined plane. The acceleration of gravity is 9.81 m/s^2.

**physics**

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the elevator accelerates? The acceleration of gravity is...

**physics**

I have a question based off of the response to the question I posted below. A dragster and driver together have mass 918.8 kg. The dragster,starting from rest,attains a speed of 25.8 m/s in .53s . Find the average acceleration of the dragsters during this time interval. Answer...

**physics**

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the elevator accelerates? The acceleration of gravity i...

**physics**

I have a question based off of the response to the question I posted below. Sorry, i wanted to make sure that i clearly understood,so My question about the third solution is: Is the horizontal force zero N? or is it 721.3N? A dragster and driver together have mass 918.8 kg. T...

**physics**

thanks so much!!

**physics**

This question refers to my question that was replied to: Sue and Jenny kick a soccer ball at exactly the same time.Sue's foot exerts a force of 62.3 N to the north. Jenny's foot exerts a force of 115.9 N to the east. What is the magnitude of the resultant force on the ...

**physics**

On planet x, an object weighs 10.4N. On planet B where the magnitude of the free fall acceleration is 1.48g (where g=9.8 m/s^2 is the gravitational acceleration on Earth),the object weighs 24.6N. The acceleration of gravity is 9.8 m/s^2. What is the mass of the object on Earth...

**physics**

A dragster and driver together have mass 918.8 kg. The dragster,starting from rest,attains a speed of 25.8 m/s in .53s . Find the average acceleration of the dragsters during this time interval. Answer in units of m/s^2. What is the size of the average force on the dragster du...

**physics**

thanks!!

**physics**

A 2172.5 kg car is coasting along a level road at 34.7 m/s. A constant braking force is applied,such that the car is stopped in a distance of 50.5 m. What is the magnitude of the braking force? Answer in N. Here is my way, but im not sure if im correct: Vf^2=Vi^2+2a(delta posi...

**physics**

thankyou so much!

**physics**

A 4100 kg helicopter accelerates upward at 2.44 m/s^2. The acceleration of gravity is 9.8 m/s^2. What lift force is exerted by the air on the propellars? Answer in N. I wasnt sure which way to approach this problem, so i tried it two different ways: A. 2.44(4100)= 10,004 N or ...

**physics**

thank you!

**physics**

A force is applied to a 2.6 kg mass and produces 2.7 m/s^2 acceleration. What acceleration would be produced by the same force applied to 14.9 kg mass? Answer in units of m/s^2 Here is my work, but i wanted to make sure if it was right or not: 2.6(2.7)=7.02 7.02/14.9=.471 m/s^2

**physics**

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the elevator accelerates? The acceleration of gravity is...

**physics**

A man is pulling on a rope with a force of 88N directed t an angle or 20 degrees to the horizontal. What is the x component of this force? What is the Y component of this force? Answer in units of N This is what i did, but i dont know if its right: x: cos(20)88=82.69 N y: tan(...

**physics**

Sue and Jenny kick a soccer ball at exactly the same time.Sue's foot exerts a force of 62.3 N to the north. Jenny's foot exerts a force of 115.9 N to the east. What is the magnitude of the resultant force on the ball? Answer in N. What is the direction of the resultant...

**physics**

A toy car is given a quick push so that it moves on an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. What net force acts on the car? A. net force of zero B. Net constant force up t...

**physics**

An elevator is being lifted up an elevator shaft at a constant speed by a steel cable. All fricional effects are negligible. In this situation,forces on the elevator are such that?: A.the upward force by the cable is greater than the downward force of gravity B. the upward for...

**physics**

A female gymnast weighs 200 N. If she is hanging stationary from a high bar,how many forces are acting on her? A. one B.five C.four D.two E.three WOuld it be choice A or D?

**physics**

A heavily loaded freight train moves with constant velocity. What is the relationship between the net force on the first car (F1) and the net force on the last car (F2)? A. F1=F2 B. F1>F2 C. F1<F2 D.unable to determine Would it be choice a?

**physics**

An artillery shell is fired at an angle of 48.2 degrees above the horizontal ground with an initial speed of 1530 m/s. THe acceleration of gravity is 9.8 m/s^2. Find the total time and flight of the shell,neglecting air resistance.Answer in units of minutes. Find its horizonta...

**physics**

thanks!

**physics**

this is in addition to my previous question (the particle undergoing an acceleration of 2.5 m/s^2 to the right and 3.2 m/s^2 up. what is its speed after 5.9s?) What is the direction with respect to the horizontal at this time? Answer between -180 degrees and 180 degrees. Anwer...

**physics**

A particle at rest undergoes an acceleration of 2.5 m/s^2 to the right and 3.2 m/s^2 up. What is its speed after 5.9s? Answer in m/s

**physics**

A car travels in a straight line for 3.7h at a constant speed of 63 km/h. What is the acceleration? Answer in m/s^2

**physics**

Which of :acceleration,age,speed,temperature,and velocity are vector quantities? Are any of them scalars?

**physics**

If a car completes a 3.8 mi oval track in 69.7 s, what is the average speed? answer in mph Did the car accelerate? (A.yes the direction of the motion changed or B. yes the speed changed or C. no the speed didnt change)

**math**

how would you solve this equation? 294 sin^2 theta = 196 sin 2 theta

**math**

Write an equation that satisfies the relationship shown in the table of value. x y -2 0 0 4 2 8 5 14 8 20

**GEOMETRY**

60cm