Thursday
April 17, 2014

Posts by Alex


Total # Posts: 2,498

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.

math
a man buys an item from delhi 10% cheaper than that at merath, incurs loss of rs. 160, but on selling the item profits rs.240. calculate the profit percentage.

Physics
You throw a ball with a speed of 30 m/s at an angle of 40.0° above the horizontal directly toward a wall. The wall is 22.0 m from the release point of the ball. (a) How long does the ball take to reach the wall? (b) How far above the release point does the ball hit the wal...

Physics
SIMPLIFY.

Physics
An arrow is shot at 29.0° above the horizontal. Its initial speed is 54 m/s and it hits the target. (a) What is the maximum height the arrow will attain? (b) The target is at the height from which the arrow was shot. How far away is it?

Physics
An arrow is shot at 29.0° above the horizontal. Its initial speed is 54 m/s and it hits the target. (a) What is the maximum height the arrow will attain? (b) The target is at the height from which the arrow was shot. How far away is it?

physics
F = ma 80 = 50(a) 80/50 1.6 m/s^2

math
juan says,"When you put together unequal groups, you can only add." is he correct? Explain

statistics
We’re writing a test case that samples a “random” black box. Given n numbers, how many times would we need to sample the black box to have n unique responses with a 99.9% confidence? Eg, if we were rolling a six-sided die, how many times would we need to roll it...

physics
A 3.8 kg toy car at rest on a horizontal surface is accelerated by a spring to 5.4 m/s in a distance of 5.9 cm. What is the spring constant of the spring?

Physics - Energy
Two comets, each of mass 6500 kg and traveling 88 m/s in opposite directions, collide head-on and come to rest. How much energy is produced in this collision? Thank you!

bio
what will happen to a red blood cell place in a solution of 99.3% water and 0.7% salt?

physics
How much work in joules must be done to stop a 5000 kg car traveling at 120 km/hr?

Math
What is the height of a trapezoid with an area of 60 square meters and bases of 8m and 12 meters?

geometry
triangular pyramid with base vertices C, A, E and B, D, and F How many planes are shown in the figure?

algebra
-2m - 18n + 17

History
By 1826 was the country more Hamiltonian or more Jeffersonian?

Chemistry
What type of lattice would FrCl have? ...im not sure about this, would a lattice form? if so, how to determine lattice type?

science
A 80.0 kg girl lowers herself to the ground from a height of 11.6 m by holding onto a rope running over a pulley to a 56.0 kg sandbag. What is the magnitude of the acceleration of the girl?

4th grade math
What are 2 other names for BN? What is another name for SL?

Physics 1 - Mechanics
You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, which is 420 km above the Earth, but he is 21 km ahead of you. (a) How long will it take you to catch up with your friend if you reduce your...

Physics 1 - Mechanics
You throw a rock with an initial horizontal velocity and it hits the ground at x meters away from your feet. What if: (a) You throw the same stone with the same initial conditions but instead you do this on a another planet with a mass 4 times the mass of the earth. With what ...

Mathematics
Alicea baked a plum bar and cut it into ninths. What fair trades can she make with Rosita, whose raspberry bar is divided into ninths?

math
4 and lower rounds down 5 and up rounds up.

Physics
In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." The radius of the room is 5.5 m, The coefficient of static friction is μ=0.1. What is the minimum rotation frequency such that the people will not slide down the wall...

Physics
An object m of mass m=1kg is attached to a string that passes through a hole in the center of a table. The object m moves in a circle of radius r=1.3m. An object M of mass M=2.1kg is tied to the other end of the string, and hangs vertically beneath the table. Assuming the tabl...

algebra
54x^3 +250 factor

Calculus
If f(x) = { √2-x x < 2 { x^3 + k(x+1) x ≥ 2 determine the value of the constant k for which lim exists. x->2

Calculus
Find all points of discontinuity f(x) = [x^2 + 5x - 2]/ [x^2 - 9]

math
X = 6 cm and Z = 10 cm, what is the length of Y?

math
5000

Math
The bakery sells cookies for $(1-i) each. How much will 3 + 3i cookies cost?

social studies
Australia antartica and south america

Physics
Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?

computer sciece(Computation Theory)
Find the error in the following proof that all horses are the same color. CLAIM: In any set of h horses, all horses are the same color. PROOF: By induction on h. Basis: For h = 1. In any set containing just one horse, all horses clearly are the same color. Induction step: For ...

physics
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 36 below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of ...

math
an object is launched from ground level with an initial velocity of 400 feet per second. To the nearest tenth off a second, how long does it take the object to reach a height off 650 feet?

physics
Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at 0 m/s. Its horizontal acceleration is 2.1 m/s^2. At what time will the particle be traveling at 54◦ with respect to the horizontal? The acceleration due to gravity is 9.8 m/s^2

physics
a car traveling 7.0 m/s accelerates uniformly at 2.5 m/s squared to reach a speed of 12 m/s. how long does it take for the acceleration to occur?

critical thinking.
"Some lawyers don't lie," is an example of which kind of categorial proposition? a. Particular Negative b.Particular Affirmative i think its a but i'm not sure

physics
For a), we're looking at outside of the shell which is not enclosed in the spherical shell.

physics
A point charge of 2.4 μC is located at the center of a spherical shell of radius 17 cm, which has a charge −2.4 μC uniformly distributed on its surface. Given: ke = 8.98755 × 109 Nm2/C2 . a)Find the electric field for all points outside the spherical shel...

physics
Okay, when I took the quotient of the distance - r1 and r2-r1, I got 0.45 Then multiplied by Q gave me 3.6*10^-12 (I changed pC to C). Am I doing something wrong again? How did you come up with 0.3583?

physics
A charge of 8 pC is uniformly distributed throughout the volume between concentric spherical surfaces having radii of 1.7 cm and3.7 cm. What is the magnitude of the electric field 2.6 cm from the center of the surfaces? Let k_e=8.98755*10^9 N*m^2/C^2 I used the formula E=k_e(Q...

chemistry
A 150.0-mL sample of Solution A is diluted to a total volume of 423 mL to form Solution B. If the concentration of Solution A was originally 20.0 mg/L, what is the concentration (in mg/L) of Solution B?

chemistry
Calculate the concentration (in mg/L) of a solution formed by dissolving 5.000 g of solute in enough solvent to make 2.300 L of solution.

algebra 1
From a shipment of 350 light-bulbs, a sample of 70 was selected at random and tested. If 21 light-bulbs in the sample were found to be defective, how many defective light-bulbs would be expected in the entire shipment?

Physics
When the sun was directly overhead in Syene, why was it not directly overhead in Alexandria?

Chemistry
I am not sure if I have the right answer or not to the following question. One mole of NO2 would be produced from how many moles of molecular nitrogen> According the equation N2 + 202 > 2NO2. I was thinking maybe 2. Does anyone know if I am right or wrong. Thanks

3rd grade math
How would you use a number line to round 148 to the nearest ten?

3rd grade math
1. Which number does not round to 400? 347 369 413 448

MATH HELP PLEASE
8 remainder of 1

3rd grade math
Tyrell says 753 rounds to 800. Sara says 753 rounds to 750. Who is correct? Explain.

math
Do 20+50 which is 70 then 5+9 which is 11 then add 70+11.

3rd grade math
It's 40.

3rd grade math
A Texas horned lizard laid 37 eggs in one place. To the nearest ten, about how many eggs did the lizard lay?

third grade math
Does (4+5) + 2 = 9+2? Explain

College Physics
A)2 b)5.7 C)87.7 D) 76.4 E)4.5

MATH(order of operations help)
What is the only order of operations that does NOT proceed from the left to the right

MATH(order of operations help)
What is the only order of operations that does NOT proceed from the left to the right

Math
Find a formula and graph the function: A ferris wheel is 20 meters in diameter and boarded in the six oclock position from a platform that is 4 meters above the ground. The wheel completes one full revolution every 2 minutes. At t=0 you are in the twelve oclock position.

probability---normal distribution
population size=50 population mean= 80m standard deviation = 0.70m what proportion would have average meter of 89 or more? ---------------------------- now I know how to solve this problem if the question is worded "what proportion would have average meter Greater than 89...

trig
If sin T = 1/2, then the value of sinT ( sinT - cosecT ) is

chemistry
Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.335-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many grams of H2 are formed?

language and barriers
It's not C.. I think in order to be a good ESL teacher you yourself have to set aside all the predjudice and what not that you yourself can think off...

Algebra
In a class of 110 students, 22 received the grade of A. what fraction of the students did not receive the grade A?

Child Care Managment
which of the following is is best suited to a formative assessment of progress? A, muscular strngth and endurance B body fat analysis C. Flexibility D awareness of selfand space. I think is A. But if Im wrong can somebody help me. thanks.

calculus
using tangent half substitution show that integral of sec(x)=ln(secx+tanx)

Math
x = 125

Math
There are 150 green marbles and 100 yellow marbles in a bag that contains 250 marbles. If only yellow marbles are added to the bag so that the probability of randomly drawing a yellow marble from the bag becomes 3/5, how many yellow marbles are in the bag?

Math
What are all values of x for which |2x-3| < 7 ?

Math
Sigourney Weaver's average rate going uphill was 80% of her average rate going downhill over the same route, and it took Sigourney Weaver 10 minutes longer to go up the hill than to go down the hill. What was the total number of minutes Sigourney Weaver spent going uphill ...

Physics
An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...

Physics
An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...

Math
What is the answer for this question: Divide 100 loaves of bread among five men so that the amounts are in aritmetic progression (increase by the same amount each time) and the sum of the 3 largest is 7 times the amount of the 2 smallest

Physics
Nevermind I was able to finally figure it out xP

Physics
You set out to design a car that uses the energy stored in a flywheel consisting of a uniform 103-kg cylinder of radius R that has a maximum angular speed of 450 rev/s. The flywheel must deliver an average of 1.70 MJ of energy for each kilometer of distance. Find the smallest ...

Calculus
Sales of Version 5.0 of a computer software package start out high and decrease exponentially. At time t, in years, the sales are s(t)=20e^-t thousands of dollars per year. After 2 years, Version 6.0 of the software is released and replaces Version 5.0. Assume that all income ...

Calculus
It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 5% per year. If the current demand is increasing by 4000 units per year and if the price remains fixed at $850 per unit, how much revenue will the manufactu...

Physics
Ah I see thank you, I had tried a different setup before which got me the wrong answer. But this helps a bunch thanks!

Physics
A curve of radius 161 m is banked at an angle of 12°. An 840-kg car negotiates the curve at 94 km/h without skidding. Neglect the effects of air drag and rolling friction. Find the following. (a) the normal force exerted by the pavement on the tires (b) the frictional forc...

algebra
a landing airplane, moving in a straight line , passes over two points (p and q) which are 300 feet apart. when the airplane is above p, as seen from Q, its angle of elevation is 60 degress, and when above Q, as seen from p, its angle of elevation is 40 degress. at what distan...

algebra
a point on one bank he finds the angle of elevation of the top of a tree on the other bank to be 60 degress. from his initial observation point he walks back 200 feet in a straight line with the tree and his first observation point and finds the angle of elevation to the top o...

Calc
A Norman window consists of a rectangle capped by a semi-circular regional. The perimeter of some particular Norman window must be 30 meters. The radius of the semi-circular region is "x" meters. The height of the rectangle is "h" meters. Find the values pf...

Math-Please help :(
a landing airplane, moving in a straight line , passes over two points (p and q) which are 300 feet apart. when the airplane is above p, as seen from Q, its angle of elevation is 60 degress, and when above Q, as seen from p, its angle of elevation is 40 degress. at what distan...

Chemistry
How many atoms of iron will react with an excess of sulfur to form 3.098 grams of iron (II) product? Fe + S ---> FeS (2.12x10*25) I would appreciate if an explanation would be given... I need more than just the answer. Thank you!

math
equation of the line containing the points (4, 5) and (-1, 3)

Math
Somebody repeatedly roll a fair die. If it comes up 6 he instantly wins(and stop playing); if it comes up k, for any k between 1 and 5, he he waits k minutes and then roll again. what is the expected elapsed time from when he starts rolling until he wins?

Maths
Without using tables evaluate 1+tan 60'/1-tan 60'

mathmm
How to make a sign diagram

Poetry
I’m not really good at reading poems and I need help on these two poems “Linage” by Margaret Walker and “The Courage My Mother Had” by Edna St. Vincent Millay I constantly read the poems but still don’t understand what their saying I know they whe...

physics
A boy drops a stone-A, down from a cliff 480 meters high, next he throws a stone-B, 1 second later - at what initial velocity was the stone-B be thrown so as to meet the stone-A on ground at the same time? g=10 m/s2.

English
Is this poem okay? A Husband’s Kiss His kiss so soft and gentle, Sending shivers down my spine I feel the love he has for me When our lips and eyes combine His love for me is equal to mine Joining together like we are one Our two hearts are so intertwined I can’t ima...

Grade 12 University physics
A 1.2kg block is dropped from 48cm above a spring in equilibrium. The force constant for the spring is 124N/m. Calculate the maximum compression in the spring.

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