Wednesday
April 16, 2014

Posts by alex


Total # Posts: 2,491

maths/physics/biomechanics
At the beginning of a race, a yacht crosses the start line and sails in westerly direction at a speed of 4 m s-1. The current of the sea is flowing at 2 m s-1 towards the north-east. Calculate how far [8 marks] and in what direction (relative to west) [8 marks] the yacht has t...

chemistry
Which of the following isotopes possesses a greater number of electrons than it does neutrons? A. 40Ar B. 24Mg2+ C. 34S2− D. 19F− E. 16O2− How do I determine the numbers of protons, neutrons, and electrons of each?

physics
A 2.00kg bullet moving at 600m/s strikes a piece of wood at rest on a frictionless table. The bullet sticks in the wood and the combined mass moves slowly down the table. a.) What is the speed of the combined mass after the collision? b.)What is the change in kinetic energy of...

chemistry
A graduated cylinder was used to transfer 201 mL of a 0.478 M solution of KCl to a beaker which was subsequently diluted to a final volume of 1.092 L. What is the final molarity of the KCl in the beaker after the solution is thoroughly mixed?

Chemistry
thanks!

chem
How many grams of water vapor (H2O) are in a 10.2 liter sample at 0.98 atmospheres and 26°C? Show all work used to solve this problem.

Chemistry
rate is 1.1 ng/dL-hr

Chemistry
A deceased person is found by the coronoer to have a cocaine concentration of 50 ng/dL. What is the concentration of cocaine in his blood two hours earlier?

mth174
A tank is full of water. Find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 for π. If you enter your answer in scientific notation, round the decimal value to two decimal places. Use equivalent rounding if you do not enter your answer in ...

maths
At the beginning of a race, a yacht crosses the start line and sails in westerly direction at a speed of 4 m s-1. The current of the sea is flowing at 2 m s-1 towards the north-east. Calculate how far [8 marks] and in what direction (relative to west) [8 marks] the yacht has t...

maths
Two athletes are pulling on a ring. One athlete pulls with a force of 150 N in a northerly direction. The second athlete pulls with a force of 200 N in a westerly direction. Calculate the magnitude [5 marks] and direction (relative to west) [5 marks] of the resultant of these ...

physics
A 75 kg skydiver in free fall is subjected to a crosswind exerting a force of 60 N and to a vertical air resistance force of 100 N. Calculate the resultant force acting on the skydiver [6 marks] and his angle of fall (relative to vertical) [6 marks].

Physics
A driver in a car traveling at a speed of 56.0 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).

Physics
I have found that it takes the lead car 11.95 s to stop and it traveled 146.4 m. But still need help with the rest.

Physics
Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.8m/s. At the moment the cars are 41.4m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.05m/s2. A) How long does it take ...

Physics
Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.8m/s. At the moment the cars are 41.4m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.05m/s2. A) How long does it take ...

Physics
tortoise= 10.1 t hare= 195.94(t-122) tortoise - hare= 10.1t - 195.94t + 23904.68 = 20.8 Solve for t 23883.88 = 185.84 t t = 128.5185 s tortoise t= (10.1)(128.5185)= 129.036 cm

Math
afraaz the answer of 12.5 is not correct, i had done the same math as you did, however the teacher said that the answer was wrong.

Physics
A diver springs upward from a board that is 4.10 m above the water. At the instant she contacts the water her speed is 11.9 m/s and her body makes an angle of 79.7 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and...

math
17*5=85 17+5=22

physics
I found the answer to part a, but I don't know how to solve part b. Part is 26.1m/s.

physics
A space vehicle is coasting at a constant velocity of 22.5 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.223 m/s2 in the +x direction. After 57.5 s, the pilot shu...

math
math : write an equation that uses 18-?and 10+2.explain how to decide which numbers would make it true.

Math
Red and blue beads are being strung to make a bracelet. How many different bracelets can be formed it each bracelet uses exactly 5 beads?

geometry
Simplify the ratio: 48 ft. -------- 36 ft.

World History
28.Olympe de Gouges

physics
In reaching her destination, a backpacker walks with an average velocity of 1.20 m/s, due west. This average velocity results, because she hikes for 5.94 km with an average velocity of 3.28 m/s due west, turns around, and hikes with an average velocity of 0.778 m/s due east. H...

Physics
Two iron spheres each have a volume of 10 cm^3 and a mass of 78g. How many electrons must be placed on each sphere so that the electrostatic force of repulsion between them just balances the force of gravitational attraction? Assume the distance between the spheres is more tha...

science/anatomy
1. pharynx 2. Epiglottis

math
I had the same question

math
I had the same question

geometry
the transamerica pyramid building shown in the photograph has four faces shaped like isosceles triangles. The measure of a base angle of one of these triangles is about 85. What is the approximate measure of the vertex angle of the triangle?

Chemistry
You can also use d=PM/RT. Density is mass/volume. Plug it in and solve for M.

physics
46

Science
I put Individuals of the same kind living in the same environment make up a population. All the populations of organisma living together in an environment make up a community. Is that correct?

Science
In my book it says Individuals of the same kind living in the same evnironment make up a population. All the grasshoppers in a field are the grasshopper population. All the populations of organisms living together in an environment make up a community What is the relationship ...

Science
It's not C, right?

Science
Nonliving things affect the organisms living in an ecosystem include weather,landforms,and?- A. habitat B. niche C. soil D. population I think its B

Science
I put Individuals of the same kind living in the same environment make up a population. All the populations of organisma living together in an environment make up a community. Is that correct?

Science
In my book it says Individuals of the same kind living in the same evnironment make up a population. All the grasshoppers in a field are the grasshopper population. All the populations of organisms living together in an environment make up a community What is the relationship ...

physics
When an airplane is in level flight, its weight is balanced by a verticallift, which is a force exerted by the air. How large is the lift on an airplane in such flight if the mass ofthe airplane is 1.20 x 10 cubed kg.?

Science
The journey of a cheese sandwich - how do you explain how cells use food using the big idea of partilces?????!!!!! HELP!!!! i hate these stupid assessments!!!!

physics
A 0.18 kg ball is placed in a shallow wedge with an opening angle of 110° For each contact point between the wedge and the ball, determine the force exerted on the ball. Assume the system is frictionless.

History
Is there any other similarities?

History
What do all of these former Presidents have in common? Abraham Lincoln,John F. Kennedy,James Garfield,and Franklin Roosevelt

Reading
I cant find any other details to replace number 5.

Reading
I meant to put on number 2 minerals not materials. Would that still be wrong?

Reading
Is this correct?

Reading
When you're scribbling a note with a pencil, do you ever wonder what this handy tool is made from? To get right to the point, a pencil is made of a number of materials. The inside is made of graphite that is reinforced with clay. Its wooden outside comes from cedar trees. ...

Reading
Icebergs can be slippery slopes for ships at sea. An iceberg can be dangerous to ships because more than 3/4 of it is under the water. Most of it isnt visible. Icebergs are found in the cold seas near the North and South Poles. The wind and currents move them through the water...

Physics
566

physics
A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?

science
laboratory connects a 16§Ù resistor, 23§Ù resistor, and a 34§Ù resistor in series and then comes the arrangement to a 36V dc source. How much current is in the circuit?

science
what are the forces on two charges of +0.44c and +2.4c, if they are separated bu=y a distance of 3.16cm? repel or attract each other?

Chemistry
Oops the charges in the equation got messed up so instead: MnO4- + 5Fe2+ + 8H+ -> 5Fe3+ + 4H2O

Chemistry
I had tremendous problems with this question as well, and since I now have the answer, I'll spread the love. First, you figure out how many moles of KMnO4 is used for both titrations using the equation ---- M=(mol)/(L) ---- (M=Molarity) Doing this, you would get the first ...

math
That question can't really be answered unless we can see the string

5th grade math
seven trillion six hundred fifty four billion three hundred twenty one million one hundred fifty eight thousand nine hundred six

5th grade math
Figure out what each place value the numbers are in

biology
A dominant gene V in humans causes certain areas of the skin to become depigmented, a condition called "vitiligo." Albinism is the complete lack of pigment production and is produced by the recessive genotype aa. The albino locus is epistatic to the vitiligo locus. A...

statistics
for a certain psychiatric evaluation z scores above 2.18 and below -2.33 are considered abnormal. what is the probability that a person evaluated by this will be considered normal?

science
place in order of increaseing nonmettalic character: Se, Po,and O. Can you explain how to do this?

SCIENCE
ORDER OF INCREASING ATOMIC SIZE: Cs, Li, and Rb

calculus II
Using integration by substitution. find the exact value of integral from [0,9/16] sqrt(1 - sqrt(x))/(sqrt(x))

Top Schools
Do what you want. Cause high school gets you into a college you want It depends on what you want to be when you grow up

physics
Calculate the difference between the magnitude of the gravitational force and the magnitude of the normal force exerted on a 100 kg object at the equator. Which of the two forces is equal in magnitude to the weight of the object?

precalc
Determine whether the sequence is geometric or arithmetic. Then give the general formula for the nth term of the sequence. 6.1, 6.9, 7.7, 8.5, 9.3,... I think it is Geometric, but i don't know how to find the formula

math
Is f(x)=4x/x-1 in factored form

precalc
Use Sigma Notation to write the sum [10-(1/10)^2]+[10-(2/10)^2]+[10-(3/10)^2]+[10-(4/10)^2]

3rd grade math
How can you use mental math to multiply 800 x 5?

3rd grade math
Marcia said that if she estimates 73 x7, the product will be less than the exact answer. Is she correct? Explain.

statistics
4. Assume you are just planning this survey and want to know how many individuals you have to randomly select to be part of the sample. Assume that the purpose of the study is to calculate a 95% confidence interval for proportion of the adult population who favor lowering the ...

Economics
D. (i), (ii), (iii), and (iv)

precalc/trig
Find the trigonometric form of the number. (Round any angles to two decimal places.) −8 − i

MATH
Y=30X+.25

art
hi i am making a comic book for my teacher for a punishment for me and she saaid it has to be funny and i cant think of any thing please help me think of something. thank you

art
i need help finding a website showing me some easy to draw abstracks pictures

physics
A 6.0 kg mass moves along an inclined plane that makes an angle of 36 degrees with the horizontal. The mass is connected by a cable to a second mass of 10.0 kg, which is suspended over a frictionless, massless, pulley and is free to move. The second mass of 10.0 kg falls at a ...

calculus
Determine where the given function is concave up or where it is concave down: f(x)=9x/x^2+49

HIstory
How have the lingering influences of the New Left and the cultural radicalism of the 1960s affected both liberal and conservative politics?

american history
its d the breakup of the former state of yugoslavia

physics
When a 19.9 kg wheel with an angular speed of 3.10 rad/s is disconnected from a motor, a 0.124 N · m frictional torque slows the wheel to a stop. If the wheel has radius of 0.71 m, how long will it take for the wheel to come to rest after being disconnected from the motor?

physics
A wheel 80.0 cm in diameter accelerates uniformly from 215 rpm to 360 rpm. If in this process a point on the edge of this wheel have traveled 118 m, how long does this process take?

math
jose said all of the multiples of 8 are also multiples of 2. jamila said that all of the multiples of 8 are also multiples of 4. who is correct. Explain

ratio
24 people in 6 cars, find the unit rate?

Physics
water flows smoothly from the left-hand pipe section (radius 2.00R), through the middle section (radius R), and into the right-hand section (radius 3.00R). The speed of the water in the middle section is 0.460 m/s. What is the net work done on 0.430 m3 of the water as it moves...

Physics
Flooded Basement Water is pumped steadily out of a flooded basement at a speed of 5.5 m/s through a uniform hose of radius 0.8 cm. The hose passes out through a window 3.1 m above the waterline. What is the power of the pump?

music
i need to do make a presentation on my favourite song how do i do it. my favourite song is moves like jagger

Chemistry
Strong base is dissolved in 675 ml of 0.200 m weak acid (ka=3.25x10^-5) to make a buffer with a ph of 3.95. Assume that the volume remains constant when the base is added. HA + OH ---> H2O + A^- calculate the pka value of the acid and determine the number of moles of acid i...

Chemistry
What would be the first step of the mechanism in the hydrolysis of SiCl4? I know that SiO2 is formed, but Im confused as to how this would occur.

Adv. English 9
for the story Liberty by Julia Alvarez..

Adv. English 9
If someone could help me answer any one of these that would be great. :) 1.Name and explain the information provided in the exposition of the story. Then, name the point at which the climax takes place and explain why it is the climax. Finally, tell what is provided in the den...

Physics
R1 is the radius from the centre of the cylinder's circle, and the R3 is the distance from R1 to another specific point also near the centre of the cylinder's circle.

Physics
A uniform 2.0 kg cylinder can rotate about an axis through its center at O. The forces applied are: F1 = 5.70 N, F2 = 3.90 N, F3 = 4.30 N, and F4 = 7.00 N. Also, R1 = 12.8 cm and R3 = 4.50 cm. Find the angular acceleration of the cylinder.

probability
if for two random variables X and Y,is Y=-X then ñ=1

probability
if for two random variables X and Y,is Y=-X then ñ=1

probability
One container contains 6 red and 4 white balls, while a second container contains 7 red and 3 white balls. A ball is chosen at random from the first container and placed in the second. Then a ball is chosen at random from the second container and placed in first. What is the p...

Caculus
oh sorry, it would be y = 500/1+75e^-.625x

Caculus
y = 500/1+75e^-.625 x = egg mass y = number of tree (thousand) The function is show the forest defoliation1. Find the percent of forest defoliation if the egg mass are 100? (Using derivative) Thank you

Org.chem. I
Probably because of Chiral recognition, there are more chiral receptor for (+)-carvone in rats. This is just my guess.

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