Thursday

May 26, 2016
Total # Posts: 501

**more physics ):**

A tennis player places a 51 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.067 kg tennis ball horizontally with a velocity of 33.4 m/s toward the north. What is the final velocity of the machine? Can you please EXPLAIN how to get the answer?!
*December 15, 2011*

**physics )':**

A 66.5 kg ice skater moving to the right with a velocity of 2.80 m/s throws a 0.16 kg snowball to the right with a velocity of 20.4 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*December 15, 2011*

**trig (pre-cal class)**

Suppose è is an acute angle of a right triangle. For this function, find the values of the remaining five trigonometric functions of è. Round to four decimal places. sin è = 0.1 cos è = tan è = cot è = csc è = sec è =
*December 15, 2011*

**Geometry**

If m<DBC=10x and m<ACb=4x^2, find m<ACB. The quadrilateral ABCD is a rectangle. B ------------- C | | | | | | | | A -------------|D There are diagonal bisectors inside the rectangle but I could not draw them in. The diagonals are DB and CA and the point in the middle ...
*December 11, 2011*

**8th grade math**

Okay, so you have two variables, let's call them x and y. x will be the weight of the water when the tank is full, and y will be the weight of the tank. So you can get two equations from the question: .4x+y=80 (1) x+y=140 (2) and now you can do elimination by subtracting (...
*December 7, 2011*

**chemistry**

8.38% thank you very much
*December 4, 2011*

**chemistry**

What is the mass pecent of an aqueous sodium hydroxide in which the mole fraction of NaOH is 0.162? The density of the solution is 1.3311 g/ mL
*December 4, 2011*

**statistics**

what is the sample mean for extrinsic value by gender
*November 22, 2011*

**Geometry**

the measure of each exterior angle is 45. how many sides does the polygon have?
*November 20, 2011*

**math**

What is the principle of powers? Describe in your own words. When solving a radical equation, how do we use the principle of powers to eliminate radicals? Demonstrate with an example.
*November 17, 2011*

**Math**

solve: 4x^2 + 14x = 0 help me solve
*November 17, 2011*

**Math**

Can you show us how to find the discriminant of the quadratic x^2 + 2x -2 =0
*November 17, 2011*

**math **

create the equation: x=2 and x=5
*November 15, 2011*

**Math**

Make an equation that has solutions x= 9 and x = -2/3
*November 14, 2011*

**math**

Multiply ã7(ã10-ã6)
*November 13, 2011*

**Math**

Add simplify by collecting like radical terms if possible 3ã45+4ã180
*November 13, 2011*

**math**

so I would have abd answer of 4root symbol625^3
*November 13, 2011*

**math**

write an equivalent expression using radical notation 625 3/4 Help
*November 13, 2011*

**math**

add simplify by collecting like radical terms if possible assuming that all expressions under radicals represent nonnegative numbers ã2a+5ã8a^3 i have the answer as (1+10a)squareroot symbol 2a is this correct?
*November 12, 2011*

**math**

Subtract simplify by collecting like terms if possible 9 3ã4-3 3ã4 Would the answer be 6 3ã4
*November 12, 2011*

**math**

Find the following. Assume a and b can represent any real number 440ã(a+b)440 Is the answer a[b]
*November 12, 2011*

**math**

write an equivalent expression using radical notation 625 3/4 would this be 1/5^4 Otherwise I am lost
*November 12, 2011*

**math**

they are squre root symbols
*November 12, 2011*

**math**

Multiply (4ã6-12ã5)(2ã6+6ã5) Would the answer be 8ã64-72ã25 I donft think I am supposed to multiply the 4 and 6 or the 2 and 6
*November 12, 2011*

**math**

multiply ã7(ã10-ã6) so would this be ã70-ã42
*November 12, 2011*

**math**

rewrite with rational exponents (9ã5x^4y)^3 would this be (15x^64y^3)1/9 help
*November 12, 2011*

**math**

So would it be 10^11 right
*November 12, 2011*

**math**

Multiply and simplify by factoring ∜10,000*∜10,000,000 I get ∜100^9 I hope this is correct
*November 12, 2011*

**Math**

so the answer is 27 Square root symbol 2x^4
*November 11, 2011*

**Math**

Simplify by factoring Assume that all expressions under radicals represents non negative numbers 3square root symbol 162x8 I end up with 3x 3squareroot symbol 2x^5 I dont think this is correct help
*November 11, 2011*

**Math**

thank you
*November 9, 2011*

**Math**

Find the length of side a in the right triangle if b=12 and c=15 I have the length as 6 but I dont think this is correct Please help
*November 9, 2011*

**Math **

So was I correcdt
*November 9, 2011*

**Math **

What does it mean to refer to a 20 inch TV or a 25 inch tv set? Such ubits are refer to the diagonal of the screen. A 25 inch TV set also has a width of 20 inch what is its height? would I multiply 20 by the height to get the diagonal? I think the answer is 15 inches Please ...
*November 9, 2011*

**english**

Do you know what this matches and why? Primate:Primeval as Coelenterate:Medieval Deliberate:Archival Ingrate:Credible Migrate:Primal Thank you!
*October 25, 2011*

**math**

When you convert 1/4, you would divide 1 by 4 and get 0.25. So when dividing .39 by 250 you get... 0.00156
*October 25, 2011*

**Physics Honors**

An egg is thrown horizontally off the roof of SI, which is 60 meters high, with an initial velocity of 6.5 m/s. How long does it take to hit the ground? How far does it go in the x direction?
*October 23, 2011*

**Physics Honors**

Jason Kendall throws a baseball with a horizontal component of velocity 25 m/s. It takes 3.0 s to come back to its original height. Calculate its horizontal range, its initial vertical component of velocity and its initial angle of projection.
*October 23, 2011*

**Physics Honors**

How long will it take a shell fired from a cliff at an initial velocity of 800 m/s at an angle 30 degrees above the horizontal to reach the ground 150 meters below?
*October 23, 2011*

**Physics Honors**

A ball is kicked horizontally at 8.0 m/s from a cliff 80 meters high. How far from the base of the cliff will the stone strike the ground?
*October 23, 2011*

**Physics Honors**

A football is kicked with an initial velocity of 25 m/s at an angle of 45 degrees with the horizontal . Determine the time of flight, the horizontal distance, and the peak height of the long jumper.
*October 23, 2011*

**Physics Honors**

A soccer ball is kicked horizontally off a 22.0 meter high hill and lands a distance of 35 meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.
*October 23, 2011*

**Physics Honors**

A pool ball leaves a 0.60 meter high table with an initial velocity of 2.4 m/s. Predict the time required for the pool ball to fall to the ground and the horizontal distance between the table's edge and the ball's landing location.
*October 23, 2011*

**Physics Honors**

A basketball is thrown horizontally from a window that is 22 meters high. If the initial velocity of the ball 18 m/s, find how long the ball takes to reach the ground and how far the ball lands from the building?
*October 23, 2011*

**Physics Honors**

The same rock is thrown upwards at an angle of 45 degrees. It travels 10 meters up to its maximum height. How far will it travel before it lands?
*October 23, 2011*

**Physics Honors**

A rock is thrown horizontally from a cliff overlooking the ocean. If the cliff is 45 meters high and the rock is thrown at 18 m/s, what is the angle at which it strikes the ocean?
*October 23, 2011*

**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*

**Physics Honors**

A pitcher throws a fast ball horizontally at 42.1 m/s How far does it drop before crossing the plate, 18.3 meters away?
*October 23, 2011*

**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*