Friday

January 30, 2015

January 30, 2015

Total # Posts: 451

**Physics Honors**

A bullet is fired from a rifle, emerging at 340 m/s. It strikes a sandbag some distance away, having lost 10% of its velocity due to air resistance. if it penetrates the sandbag to a depth of 12 meters, how long did it take for the bullet to come to rest in the bag?
*October 23, 2011*

**U.S History**

Iroquois
*October 17, 2011*

**language**

how has workng together changed history?
*October 12, 2011*

**OChem**

john tsai you're a chink dont think that i dont know you
*October 12, 2011*

**OChem**

Typo: What intermolecular forces are important in the binding of molecules to the ADSORBENT in ADSORPTION chromatography?
*October 12, 2011*

**OChem**

What intermolecular forces are important in the binding of organic molecules to the absorbent in absorption chromatogrpahy? Select all that apply. A) London forces B) Van der Waals forces C) Covalent Bonding D) Hydrogen bonding E) Dipole-dipole interactions F) Lewis acid-base ...
*October 12, 2011*

**chemistry**

A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?
*October 10, 2011*

**Physical Science**

Can someone please help me with this question Im not really sure what the question is asking, I don't understand at all. Please explain. With sound, you get harmony when the frequencies of two sounds are in the ratios of small integers - eg, two sounds with one frequency ...
*October 5, 2011*

**science**

The sun shines down on a mirror. The angle between the incident rays of sunlight and the vertical is 60o. What is the angle between the reflected rays and the vertical? I think the answer is 60 am i correct
*October 4, 2011*

**Calculus**

yes I know that but I need to steps for how you find the derivative.
*October 2, 2011*

**Calculus**

thanks allie but i need someone to show the work to how they got those answers too please :)
*October 2, 2011*

**Calculus**

Let f(x)=x^2+5x-3. Find f′(x) and find f′(1).
*October 2, 2011*

**Calculus**

Take the derivative of the following functions. You do NOT need to simplify. h(x)=(6x^3+2x)/(x^2-3x+5)= F(x)=(5x^2+1)(3x-2) =
*October 2, 2011*

**Calculus**

Suppose that f(2)=3 and f′(2)=5. Let g(x)=x^3f(x). Evaluate g′(2). Your final answer should be a single number.
*October 2, 2011*

**Calculus**

Take the derivative of f(x) = 4x^3+(7/x^2).
*October 2, 2011*

**Calculus**

Let f(x)=21−x^2 The slope of the tangent line to the graph of f(x) at the point (−4,5) is ______ . The equation of the tangent line to the graph of f(x) at (−4,5) is y=mx+b for m=______ and b=_______.
*September 29, 2011*

**Calculus**

For what values of x is the tangent line of the graph of f(x)=8x3+36x2+46x−72 parallel to the line y=−2x+1.9 ? Enter the x values in order, smallest first, to 4 places of accuracy: x1= ≤ x2=
*September 29, 2011*

**Calculus**

If f(x)=(3x)/(1+x^2) find f′(4). Use this to find the equation of the tangent line to the curve y=3x1+x2 at the point (4,0.70588). The equation of this tangent line can be written in the form y=mx+b where m is: and where b is:
*September 29, 2011*

**Calculus**

If f(x)=(3)/(x^2) find f′(4).
*September 29, 2011*

**Calculus**

Let f(x)=sqrt(3+2x) f′(5)=
*September 29, 2011*

**help please :)**

yes it is D
*September 27, 2011*

**PHYSICS! HELP PLEASE**

A shopper pushes a cart 43 m south down one aisle and then turns 90.0° west and moves 15 m. He then makes another 90.0° turn and moves 10 m. (a) What is the largest possible displacement of the shopper? ______ m _____° counterclockwise from west (b) What is the ...
*September 27, 2011*

**Physics!**

A quarterback takes the ball from the line of scrimmage, runs backward for 10 yards, and then runs sideways parallel to the line of scrimmage for 4 yards. At this point, he throws a 32 yard forward pass straight down the field. What is the magnitude of the football's ...
*September 27, 2011*

**physics **

A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...
*September 26, 2011*

**Science**

You have two cups, one containing 100 g of ice at 0oC, the other containing 100 g of water at 80oC. You pour the hot water into the cup containing the ice. What do you wind up with? A) 100 g of 0oC water and 100 g of 80oC water. B) 50 g of 0oC ice and 50g of 0oC water. C) 200 ...
*September 26, 2011*

**science**

thrs jguyvftrd
*September 23, 2011*

**Math **

Solve by Elimination 2x+3y=2 4x+6y=4 I got the answer there are infinitely many solutions I hope this is correct? Please help
*September 23, 2011*

**Math 116 A**

9<x<14 Write an interval notation
*September 23, 2011*

**algebra help bad!!!!**

Solve 2x+9 greater or equal to 5 and 2x-13greater or equal to 9 what is the solution? I have x=-2 and x=2 how do I write this {x x> what?
*September 22, 2011*

**math help asap**

what is the solution to 2x+9greater or less then 5 and 2x-13greater or equal to -9.
*September 22, 2011*

**Matth 116**

9/10th (3+8x)+3greater or equal to 15 what is the solution to this?
*September 22, 2011*

**Science 6th grade**

with epoxy or metal rods
*September 22, 2011*

**Math**

Independent or dependent?
*September 22, 2011*

**Algebra 116 A**

So would this be Parentases? Because the 9 and 14 are not included as the solution?
*September 22, 2011*

**Physical Science**

The diving board is 3m above the floor thats all the information we were given
*September 11, 2011*

**Physical Science**

A boy with a mass of 30 kg jumps off a 3 m diving board. How much kinetic energy does he have just before he hits the water? Answer none. 90 N. 900 J. 1800 J.
*September 11, 2011*

**physical science**

A boy with a mass of 30 kg stands motionless at the end of a diving board 3 m above the floor. The boy has: Answer no energy. kinetic energy only. potential energy only. both kinetic and potential energy.
*September 10, 2011*

**physics**

If a speeding car slams into a brick wall and comes to rest, how will the impulse that acts on it compare with gradually slowing down and coming to rest?
*September 5, 2011*

**Physics**

a transport truck pulls on a trailer with a force of 600 N {E}. the trailer pulls on the transport truck with a force: a) zero b) of less than 600 N[W] if the truck is slowing down. c) equal to 600 N [W] only if the truck is moving at constant velocity d) equal to 600 N [W] no...
*August 27, 2011*

**Physics! - PLEASE HELP**

a little spider monkey (let's call her flo) has stolen a bunch of bananas from her older brother charley and is now running away from him with the bananas in hand. she sees salvation in a long vine and grabs the bottom, hoping to swing away. a) is flo, who has a mass of 5....
*August 26, 2011*

**physics for bobpursley**

a little spider monkey (let's call her flo) has stolen a bunch of bananas from her older brother charley and is now running away from him with the bananas in hand. she sees salvation in a long vine and grabs the bottom, hoping to swing away. a) is flo, who has a mass of 5....
*August 26, 2011*

**Physics! - PLEASE HELP**

for b) does that mean that even when he grabs onto the vine with her, their velocity is 4.8 m/s? I am in grade 11 and have not learned momentum.
*August 26, 2011*

**Physics! - PLEASE HELP**

a little spider monkey (let's call her flo) has stolen a bunch of bananas from her older brother charley and is now running away from him with the bananas in hand. she sees salvation in a long vine and grabs the bottom, hoping to swing away. a) is flo, who has a mass of 5....
*August 26, 2011*

**History**

they think that it doesn't matter that different stuff matters like t.v. video games
*August 25, 2011*

**calculus!URGENT**

thank you soooooo much!
*August 17, 2011*

**calculus!URGENT**

Show that the tangent line to the curve y=x^3 at the point x=a also hits the curve at the point x=-2a. Any help?! PLEASE!
*August 17, 2011*

**Chemistry**

Serine exists in its zwitterion form at a pH of 5.7. Draw the structural formula for the same. Explain the manner in which the structural formula of polar and non-polar amino acids would vary.
*August 10, 2011*

**Calculus**

THANK YOU! I get it now!
*July 26, 2011*

**Calculus**

At 2:00PM boat X is heading due west at 15mph towards a dock that is exactly 15 miles away. At the same time boat Y leaves the dock traveling due north at a speed of 20mph. At what time will the boats be closest together?
*July 26, 2011*

**PHYSICS!!**

can you tell me exactly what you did instead of just giving me the formula? please and thank you
*July 13, 2011*

**PHYSICS!!**

the answer i got is 288600W
*July 13, 2011*

**PHYSICS!!**

A car's engine can accelerate a car from rest to 30 m/s in 6 s. if the car's mass is 1300 kg, what is the power of the engine? can someone give me the answer because i just want to verify it with my own? thank you!
*July 13, 2011*

**Physics! - PLEASE HELP**

A 75 kg passenger in a van is wearing a seat belt whent he van moving at 15m/s, collides with a conrete wall. The front end of the van collapses 0.50 m as it comes to rest. a) what was the paseenger's kinetic energy before the crash b) What average force did the seat belt ...
*July 12, 2011*

**Physics - Work**

A tennis racket is in contact with a 55 kg ball for 0.0050 s changes the ball's velocity from 30 m/s [E] to 40 m/s [W] over a distance of 0.0001 m. how much work is done on the tennis ball by the racket?
*July 10, 2011*

**Physics**

consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is directed parallel to the incline to cause the cart to be displaced parallel to the incline for a given displacement of 0.7 m. The initial energy plus ...
*July 8, 2011*

**Physics**

consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is directed parallel to the incline to cause the cart to be displaced parallel to the incline for a given displacement of 0.7 m. The initial energy plus ...
*July 8, 2011*

**how to make $60 two ways using 3 coins**

You would have to use a 50 cent coin and then two nickels t equal 60 cents.
*July 6, 2011*

**Physics - Newton's first law**

A pair of fuzzy dice hang from the rear view mirror of a car. For each of the motions indicate which way the dice would move and why: a) constant velocity forward b) speeding up backward c) slowing down forward I understand that when the car's state of motion changes, in ...
*July 4, 2011*

**Nutrition**

How many grams of nitrogen are contained in a 2,500 kcal diet that provides 15% of the energy as protein? What would be the approximate weight gain of a person who consumes an excess of 500 kcal daily for one month? Which of the following is an FDA approved over-the-counter ...
*July 4, 2011*

**nutrition**

How many grams of nitrogen are contained in a 2,500 kcal diet that provides 15% of the energy as protein? What would be the approximate weight gain of a person who consumes an excess of 500 kcal daily for one month? Which of the following is an FDA approved over-the-counter ...
*July 2, 2011*

**Physics!**

I know I have to find angular speed in order to find the radius of orbit. With the radius of orbit and velocity I can find centripetal acceleration. I then apply Newton's 2nd Law to solve for the mass. I am stuck on finding angular speed...
*June 3, 2011*

**Physics!**

The two stars in a certain binary star system move in circular orbits. The first star, Alpha, has an orbital speed of 36 km/s. The second star, Beta, has an orbital speed of 12 km/s. The orbital period is 137 d. a) What is the mass of the star alpha? b) What is the mass of the...
*June 3, 2011*

**english**

Does anyone know how to write a universal theme paper?
*May 16, 2011*

**Physics HELP!**

You are at the controls of a particle accelerator, sending a beam of 3.90×10^7 m/s protons (mass m ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown element. All...
*May 11, 2011*

**precalc**

I am really struggling with a bunch of problems. Any help with any of the following would be greatly appreciated. Thanks 1. ln e^(ln x) - ln(x - 3) = ln 8 2.3e^(6x - 2) = 18 The word problems, especially, are killing me. 3. In the formula A = Iekt, A is the amount of ...
*May 6, 2011*

**Math**

I know that I have to use log to solve, but I am having a hard time with the word problems. Please help Coffee is best enjoyed at a temperature of 121° F. A restaurant owner wants to discover the temperature T at which he should serve his coffee so that it will have ...
*May 6, 2011*

**physics**

If 7.00hp are required to drive a 1500-kg automobile at 66.0 km/h on a level road. What power is necessary to drive the car at 66.0 km/h down a 1.00 % grade? It requires 42.9 hp to drive the car at 66.0 km/h up a 10.0 % grade (a hill rising 10.0 m vertically in 100.0 m ...
*May 5, 2011*

**Physics**

It is a fact.
*May 4, 2011*

**Physics**

If 7.00hp are required to drive a 1500-kg automobile at 66.0 km/h on a level road. What power is necessary to drive the car at 66.0 km/h down a 1.00 % grade? It requires 42.9 hp to drive the car at 66.0 km/h up a 10.0 % grade (a hill rising 10.0 m vertically in 100.0 m ...
*May 4, 2011*

**math**

10.81 yrs for the first question 9 yrs for the second
*May 1, 2011*

**math**

So I think I have got these down I just really want to double check the answers to these two word questions. Thanks How long will it take for $9500 to grow to $36,300 at an interest rate of 12.4% if the interest is compounded continuously? Round the number of years to the ...
*May 1, 2011*

**MATH**

2, -4, 8,... The first term of the sequence above is 2, and every term after he first term is -2 times the preceding term. How many of the first 50 terms of this sequence are less than 100? (A) 22 (B) 25 (C) 28 (D) 30 (E) 37
*April 24, 2011*

**physics**

The 4.00-kg block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended towards the rod and each have a length of 1.25. The length from the upper string and lower string on the rod is 2...
*April 21, 2011*

**Chemistry**

If 40 g of KNO3 is dissolved in 100 mL of water at 25 degrees celisus, what will the final temperature be?
*April 17, 2011*

**Oral presentation**

ohh I see thank you for your help :)
*April 15, 2011*

**Oral presentation**

okay thanks! Its called "Not Marble, Nor the Gilded Monuments" by Shakespeare
*April 15, 2011*

**Oral presentation**

My teacher gave us a sonnet and he said that we have to do an oral presentation that faithfully interprets the meaning of the poem. Do you have any ideas on how to make an oral presentation describing a poem. Should I explain line by line or just put the sonnet in my own words...
*April 15, 2011*

**Physics**

A faulty model rocket moves in the xy-plane (the positive y-direction is vertically upward). The rocket's acceleration has components a(t)_x=alpha*t^2 and a(t)_y=beta-gamma*t, where alpha = 2.50 , beta= 9.00 , and gamma= 1.40 . At the rocket is at the origin and has ...
*April 13, 2011*

**math**

An initial investment of $1240 is appreciated for 17 years in an account that earns 8% interest, compounded continuously. Find the amount of money in the account at the end of the period.
*April 8, 2011*

**math**

The decay of 333 mg of a radioactive substance is given by A(t) = 333e-0.024t, where t is time in years. Find the amount left after 17 years.
*April 8, 2011*

**Physics**

If the expression for a given vector is Vector A-Vector B=(4-5)i^+(3+2)j^ and the magnitude of the difference of the vector is equal to 5.1. What is the direction of the difference Vector A - Vector B. (in the counterclockwise and +x direction)
*April 7, 2011*

**Physics**

Thank you!! That helped a lot
*April 7, 2011*

**Physics**

An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 43 steps at an angle 45north of east, then 80 steps at an angle 60 north of west, then 51 steps due south. Assume his steps all have equal length. Save him from becoming hopelessly lost in the ...
*April 7, 2011*

**Physics (PLEASE HELP!)**

Two point charges, the first with a charge of +3.25×10−6 C and the second with a charge of -4.63×10−6 C , are separated by 25.5 cm. Find the magnitude of the electrostatic force experienced by the positive charge. Is the magnitude of the force ...
*April 4, 2011*

**Chemistry**

What is the concentration of OH- in a solution that contains 0.225g of NaOH in 0.250L of solution?
*April 2, 2011*

**Chemistry**

I am having trouble figuring out the calculations for osmotic pressure. This is what I need to do. Indicate whether the osmotic pressure of a 0.1M NaNO3 solution will be less than , the same as , or greater than that each of the following solutions a. 0.1M NaCl b. 0.1M KNO3 c...
*April 2, 2011*

**Biology**

in cattle a dominant gene (N) results in a deep notch in each ear. a recessive gene (n) results in an "udder" abnormiality when in the homozygous condition. a farmer desires to rid his herd of these characteristics. which of these two alleles would be easiest to ...
*March 25, 2011*

**Chemistry**

Enter the net ionic equation, including phases, for the reaction og AgNO3 (aq) with Ba(OH)2 (aq). I have Ag+ +OH- =AgOH but I dont know how to determine the phases.
*March 18, 2011*

**Math**

Miles said that he measured an angle of a regular polygon to be 130 degress. Explain why this result is impossible.
*March 17, 2011*

**Calculus**

a) Find a Cartesian equation relating and corresponding to the parametric equations: x=2sin(3t), y=9cos(3t). Write your answer in the form P(x,y)=0, where P(x,y) is a polynomial in x and y, such that the coefficient of y^2 is 4. b)Find the equation of the tangent line to the ...
*March 12, 2011*

**Calculus**

I just figured it out! thank you!
*March 12, 2011*

**Calculus**

if x=e^t and y=(t-3)^2 , find an equation y=mx+b of the tangent to the curve at (1,9).
*March 12, 2011*

**physics/physical science**

I have multiple questions like the following and need help on how to work out the answer of one because our book does not cover impulse. a car is at rest when it experiences a fwd propulsion force to set it in motion. it then experiences a second fwd propulsion force to speed ...
*March 2, 2011*

**physics**

a pirate ship fires a 25kg cannonball with a velocity of +100m/s at a very heavy fur trader ship. the ship is at rest. the cannonball bounces off the side of the ship, making a hole. after the collision the cannonball has a velocity of -0.5m/s. assume the water did not absorb ...
*February 28, 2011*

**World Civics**

How did the U.S. affect Latin America in the 1920's and 1930's? Was it positive or negative? Explain. What happened to Latin American governments in the 1930's? Why did it happen?
*February 25, 2011*

**Calculus**

A chain 27 feet long whose weight is 74 pounds is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the entire chain to the top of the building?
*February 11, 2011*

**calculus**

To find the slope of the tangent line you have to take the first derivative of f(x). So f'(x)=-5. Or you can also see that from the formula y=mx+b, where m is slope and b is your y intercept, that -5 is the slope. Because the original function is a line, the slope is the ...
*February 11, 2011*

**physics**

How much work is required to lift a 600-kg satellite to an altitude of 4 * 10^6 m above the surface of the earth? The gravitational force is F=GMm/r^2, where M is the mass of earth, m is the mass of the satellite, r is the distance between them. The radius of the earth is 6.4...
*February 11, 2011*

**Math**

Walking down a long moving escalator, Phil covered 75 m in distance in 25 seconds. Walking back up against the motion of the escalator, the distance was covered in 75 seconds. What was the speed of the escalator?
*February 6, 2011*

**statistics**

I have created my chart but am really confused on creating a Hypothesis and how to actually use the information obtained by my chart. The question is about the variance in a production process is an important measure of quality. A lrg var often signals an opportunity for ...
*January 28, 2011*

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