physics please HELP !

129,474 results, page 51

Math - please elaborate

can someone please further explain my question on? it's just a farther bit down. The subject is "Math - help really needed" I think I almost got the answer, but I'm not sure where to go from there. really appreaite all the help so far as well; thank you. :)

HCA 240

help i need help on this im so confused and don't know what to do please help!!!! propose an improved community-based education/awareness program, targeted at the population most affected by this disease that builds upon the existing program you are researching.......I am ...

Pre-Cal(Please help)

Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

chemistry

Please I need help...I have been trying so hard to finad this answer... Suggest a test chemical that can be added to the water sample to precipitate the lead(II) ions. please show a chemical eqaution for the formation of the precipitate. Thank u so much:)

Chemistry

I still don't understand how to do this problem; grams/molar mass I understand, but I need to see the steps CLEARLY. 43. How many moles are in 25.0 grams of potassium? Show your work and round your answer to the appropriate number of significant figures. Please, please help ...

Algebra-Please check

We're learning arithmetic sequences-please check this for me-it's my first day calcuulating htese and I'm not sure If t(1) = 5 and t(n) = t(n-1) + 2, find the first 4 terms of the sequence I think it would be 5,7,9,11 because the difference is 2 so I just added 2 to each of ...

Math - Measurement Pink Wk Bk (PLZZZ HELP!)

4. 3 1/2 T = ______ ib 5. 32 oz = ________ ib 7. _____ ib = 7 T Solve: 10. 12 oranges weigh 2 1/4 pounds. How many ounces is this? __________ PLEASE HELP, I really don't get this. Please Help!!!! Thank You!!! :) PS: For homework, we have to do p. 6 in our pink wk bk (every ...

Help, Math 8th grade!!!!!

14. 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. Please help!! I need answer now!! I have been working on this problme for over an hour cant get it, please help, someone, anyone!!!1

MATHS

Critical help please. Level 3 maths algebraic methods is really hard. Q) Two functions f and g are defined by f:x (arrow) x^2 + 3 g:x (arrow) 2x+1 Find a) the function fg b) solve the equation f(x)=12g^-1(x) I need to show my working out, please help someone

Coordinate Geometry

Please help!!!!! The points A,B,C,D have coordinates (3,3), (8,0), (-1,1), (-6,4) respectively. a) Find the gradients of the lines AB and CD b) Show that ABCD is a parallelogram c) Find the coordinates of the point of intersection of the diagnols AC and BD. Please help me by ...

8th Grade Math

I need help on the following please? A group of clowns performs in a ring with an area of about 2,123 square feet. What is the circumference of the ring? Choose the closest answer. 156 ft. 52 ft. 163 ft. 82 ft. Thank You. Please explain the answer

GEOMETRY CIRCLES PLEASE

The diagram shows tangent circles and lines. if AB=15 CM find AC, AD and AE . Help me reiny and other tutors please<3 thank you this is the figure img19.(imageshack.)us/img19/7143/0eua.png just remove the open and close parentheses thank you

math

please,please help!im doing subtraction with renaming but don't understand.I have to estimate,then find the difference and write in simplest form.I just need help with two and may be able to do the rest on my own.6 and 1/3 minus 3 and 5/6 is the first one and 9 minus 3 and 7/8...

chemistry

the Ksp of Bi2s3 at room temmperature is 1.60x10-72, what is its solubility in g/100 ml? Please help me with the solution. Our teacher haven't discussed this yet so I have no idea how to solve this.. and if i ever got the answer with your solution. could you please check my ...

Math Please help!!!

A 154-lb person burns 420 calories per hour riding an exercise bicycle at a rate of 15 mi/h. Write a function rule to represent the total calories burned over time by that person. Can someone please help me???

MATH CHECK PLEASE

James bought 5 baseball cards at a garage sale for $0.65 each. He sold them to a collector for $2.25 each. what was his profit? A. $3.25 *** B. $8.00 C. $11.25 D. $14.50 Serena has 7/8 yd of fabric. To complete her craft project, she needs 3 times that amount. How many yards ...

chemistry

2Na + 2H2O---> 2NaOH + H2 Need to find the molecules of H2 Atomic wt o Na = 23 48.7 g of Na 48.71/23 = 2.12 mols Na 2.12/2 × 24. (WHERE DOES THE 24 COME FROM) = 25.44 dm^3 H. (PLEASE EXPLAIN THIS PART) = 1.06moles 1.06mols× 6.02×10^23 avagados number= 1.204 × 10^24 ...

Social Studies

What bordered the Gupta Empire to the north? 1. Ganges River 2. India 3. Himalaya*** 4. Bay of Bengal The Hindu Kush are near which river? 1. Ganges 2. Nile 3. Arabian 4. Indus**** Please check my answers Ms.Sue please

chemistry help!!! please!!! DrBob222 I need you!!

How many atoms of carbon are needed to produce 0.45 mol Al? 3C + 2Al2O3 4Al + 3CO2 A. 2.6 × 1026 atoms B. 9.7 × 1024 atoms C. 3.0 × 1022 atoms D. 2.0 × 1023 atoms I'm really very stuck with this question. please help me!!!

physics

Fretta and her brother deucde to visit some friends near a house.they decide to travel along the road and go 250 m(W),360 m(W40degreesN), and then200 m(N).. we need to find :the resultant displacement. hi please help me with this, so far iv figured it out as a rombus shape, so...

physics

Fretta and her brother deucde to visit some friends near a house.they decide to travel along the road and go 250 m(W),360 m(W40degreesN), and then200 m(N).. we need to find :the resultant displacement. hi please help me with this, so far iv figured it out as a rombus shape, so...

Physics 121

Two block are connected by a rope that runs over a pulley. The block on the tables has mass 4kg, the hanging block has mass 2kg, and the pulley has mass 0.5kg and radius 0.25m. Assume that the table is friction-less. If the block are released from the rest, determine their ...

physics

An object that is 19 cm in front of a convex mirror has an image located 24 cm behind the mirror. How far behind the mirror is the image located when the object is 12 cm in front of the mirror? I found that 1/Di = 1/-24 + 1/19 - 1/12 = -.07236. And that means that f= -13.82. ...

Physics(Please help)

What characteristic of water would you be investigating when you place a small drop of water on wax paper and when you try to float a paper clip in water? I know that the paper clip does not float and that the drop of water rolls around on the paper.

Physics

A 0.300 kg iron horseshoe that is initially at 550°C is dropped into a bucket containing 19.4 kg of water at 21.1°C. What is the final equilibrium temperature (in °C)? Neglect any heat transfer to or from the surroundings. Do not enter units. I'm taking (specific heat of ...

Physics

A 67.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are .800 and .460 respectively. A) what horizontal pushing force is required to just start the crate moving? B) What horizontal pushing force is required to slide the ...

physics

A sailor in a small sailboat encounters shifting winds. She sails 2.00 km east, then 3.50 km southeast, and then an additional distance in an unknown direction. Her final position is 5.80 km directly east of the starting point. a) Find the magnitude of the third leg of the ...

Physics

i got the first part of this quesion, please show me how to do the second part A truck driver travels 8 km ease, and then he turns around and travels 3 km west. then he turns again and travels 12 km east. a. what distance has the driver travele that would be 23 km. just add b...

physics

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +13.0 m/s^2. At t(subscript 1), the rocket engine is shut down and the sled moves with a constant velocity v until t(subscript 2). The total distance traveled by the sled is 5.30 ...

physics

A baseball is thrown with an initial velocity of magnitude v at an angle of 27.2 with respect to the horizontal (x) direction. At the same time, a second ball is thrown with the same initial speed at a different angle with respect to x. If the two balls land at the same spot, ...

PLEASE HELP. physics

A .25 kg skeet is fired at an angle of 30 degrees to the horizon with a speed of 30 m/s, When it reaches the maximum height, a 15 g pellet hits it from below. Before the collision, the pellet was traveling vertically upward at a speed of 200 m/s Embedded in the skeet, the two ...

physics urgent!!!

A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a component and ...

Physics

Please try to be clear in your explanation!! A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 5.00 m/s, and her takeoff point is 1.50 m above the pool. (a) How long are her feet in the air? ______seconds (b) What...

Physics

The weight of the block at rest on a frictionless table is 305 N. This block is attched by a string to another mass that hangs off a frictionless pulley. And the weight of the hanging block is 125 N. Ignoring all frictional effects and assuming the pulley to be massless, find ...

Physics- PLEASE HELP

In a Broadway performance an 80.0 kg actor swings from a 2.05 m long cable that is horizontal when he starts. At the bottom of his arc he picks up his 47.0 kg costar in an inelastic collision. (a) What is the velocity of the swinging actor just before picking up the costar? (b...

Physics Please check my answer

Okay, so I've figured this much out on my own, I just need help with the next part. It's a two block system with a friction of .20 a hanging mass of 7.5 kg and mass on the table at 10 kg. I got 3.08 m/s^2 for the acceleration and I got 22.8 N for the tension in the rope. This ...

Physics

A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 6.1 m/s . When the balloon is 28 m above the ground, she accidentally releases the bag. What is the speed of the bag just before it reaches the ground? I got Vf^2= Vo^2 +2ad Vf^2= 0+ (2*9...

Physics

A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 6.1 m/s . When the balloon is 28 m above the ground, she accidentally releases the bag. What is the speed of the bag just before it reaches the ground? I got Vf^2= Vo^2 +2ad Vf^2= 0+ (2*9...

physics!

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18m/s. The cliff is 52m aboce the water's surface. How long does it take for the stone to fall to the water? With what speed does it strike the water? I got how long it took, but how ...

physics

A pair of sleds weighs 25kg and experiences a frictional force of 25N. If a dog team applies a 175N force pulling it 12m. 1. Find the work done by friction 2. Find the work done by the dog team 3. Find the net work done I need to compare my answers so the could you please post...

physics

A 300 kg boulder is dragged 8 m across level ground with a chain that makes an angle of 37° with the horizontal. If the applied force on the chain is 800 N and there is a coefficient of friction of 0.20, find (a) the work done by the applied force, (b) the force of friction...

Physics Please help

A 8.0×10−2 kg arrow hits the target at 25 m/s and penetrates 3.8 cm before stopping. What average force did the target exert on the arrow? What average force did the arrow exert on the target?

physics

A +5.0-uC charge experiences a 0.48-N force in the positive y direction. If this charge is replaced with a -2.7-uC charge, find the magnitude of the force in this case Find the direction of the force in this case. help please i am confused

Physics(Please respond)

Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.7x10-5 m/s. (a) What is the angular speed (the magnitude of the angular ...

Physics

Could someone help me with this, please. Thanks. The tension in a rope attached to a boat is 27.5 lb. The rope is attached to the boat 6.0 ft below the level at which the boat is being drawn in. At the point where there is 18.0 ft of rope out, what force is bringing the boat ...

Math

using sin(alpha-beta)=(sin alpha)(cos beta)-(cos alpha)(sin beta) use the identity to derive the result proof for : sin(alpha-beta) PLEASE PLEASE PLEASE HELP

math(HELP PLEASE)

can someone please answer these 2 questions please..with the work and answer,ive been stuck on for a while and just wanna sleep but thanks. Find the unit price for each option shown below. Round to the nearest cent when necessary. Indicate which option is the better buy. ...

Child Care

Please help me, I need to make a Lesson Plan on diversity, for Pre-k, I choose a story book, of children from different parts of the world, each going to and learning in school or on the outside. The goal should show differences but also its similarities. I need a learning ...

business/math

please answer:a portfolio had an original value of $8500 eight years ag.the current value of the portfolio is $45389.what is the average geometric return on this portfolio? urgent response need please

math

please can anyone help me to gget the answer of this question,please help me solve thie word problem below is the question......Snow spent 5/8 of her money on books and another 1/6 of her money on stationeries. What fraction of Kathy’s money was left?

math 12

i got the wrong answer from the back, and i know that imnot dooing it right. please try to help me on this hard question. THE ANSWER WAS:16 solve the equation: 3log(x-15)= (1/4)^x i don't know how to solve it algerbrically. the teacher doesn't want us to solve it graphically. ...

Chemistry-Conversions

Can you please show me how to set up these conversions (how to do each of these conversions) Question- The pressure of gas is measured ay 550 mm Hg. Calculate the pressure in: a. Torr b. lb/in2 c. atm d. in Hg Can someone other than DrBOB answer this please!

Chemistry-Conversions

Can you please show me how to set up these conversions (how to do each of these conversions) Question- The pressure of gas is measured ay 550 mm Hg. Calculate the pressure in: a. Torr b. lb/in2 c. atm d. in Hg Can someone other than DrBOB answer this please!

english

can you please tell me if this is a sentence or fragment: The plan to have a class reunion. I think it's a sentence but idk because i can continue it by adding "is cancelled" in the end. How to know if it's already a sentence? of it's still a fragment? PLEASE HELPPP

Chemistry Help Please!

At most, how many 4d electrons can an atom have? Of these what is the maximum number that can have ms= -1/2? A 5f electron has what value of quantum number l? What values of ml may it have? Also please explain how you got the answers so I can understand? Thank you so much!

ART PLEASE ASAP!!!

Does anyone know the answers to this lesson? I'm a connexus user and I NEEEED the answers to this PLEASE I BEG OF YOU!!!! The lesson I'm on is called lesson 4 unit 5 Whats in a name? THANK YOU SO MUCH IF I DONT RESPOND RIGHT AWAY

Calc: PLEASE HELP!

How can this be proven! I have tried so many ways! PLEASE help! Verify using an example that Vector a + (Vector b • Vector c) = (Vector a • Vector b) + Vector c? Explain your reasoning.

Math Ms. Sue please help me

The mean of the set of four test scores is 88. If three of the test scores are 84, 88, and 94, what is the fourth test score? A. 86 B. 88*** C. 90 D.92 please help am i right?

Physics

I've been stuck on this problem and hope someone can help me. A man is standing on scales which show his weight as 607.6 N. A .50 kg ball is dropped from a height of 1 m into his hands. His hands drop 25 cm from chest level to waist level during the catch.His mass is 62 kg. If...

Physics

Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How fast is the free ...

physics

Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How fast is the free ...

Physics waves- check answers please

1. In a standing wave, the medium at the tip of a loop is a) showing destructive interference b) not moving c) at the original amplitude of the wave d) showing constructive interference my answer: b 2. If a motorcycle is travelling toward an observer the frequency the observer...

Physics waves- check answers please

1. In a standing wave, the medium at the tip of a loop is a) showing destructive interference b) not moving c) at the original amplitude of the wave d) showing constructive interference my answer: b 2. If a motorcycle is travelling toward an observer the frequency the observer...

Math (Mrs. Sue, please help?)

Describe how you can make the line of best fit. Write the approximate slope and y-intercept of the line of best fit. Show your work. So, I know how to make a line of best fit-- how do I write the y-intercept or slope of it, though? Please, please help. The coordinate (tell me ...

Physics. please help! due tomorrow!

Let W1 represent the work required to accelerate an object on a frictionless horizontal surface from rest to a speed of v. if W2 represents the work required to accelerate the same object on the same surface from a speed of v to 2v, then which one of the following is the ...

PHYSICS NEED HELP PLEASE

You need to open a heavy door that's 40 inches wide. Instinctively, you push near the edge that's the farthest from the hinges. If instead, you had pushed at a point only 10 inches in from the hinges, how much harder would you have had to push to open the door at the same ...

Physics

A fireworks rocket is moving at a speed of 48.4 m/s. The rocket suddenly breaks into two pieces of equal mass, which fly off with velocities v1 and v2, as shown in the drawing. What is the magnitude of (a) v1 and (b) v2? In the image the two pieces are going off in a right ...

Physics

I know that if a ramp is steeper, larger theta, then the object rolling down will become faster. However, if the object is rolling up the ramp will it slow down like I think it should? How can I prove this? When I try to prove it via a kinetmatics equation I keep getting that ...

Physics-Please check

Posted by JulieAnne on Wednesday, January 5, 2011 at 5:15pm. Please check my two answers I was sitting in a park on a bench next to another person and I moved tow times the original distance between the two of us, the force of gravity between me and the other person would be: ...

PHYSICS

Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/3 revolution per second. Assuming a minimum coefficient of friction of 0.70 between clothing and wall, what diameter ...

Physics , static fluids

hello, I hope you can help... A diver accustomed to standard snorkel tubing of length 25 cm tries a self-made tube of length 8.6 m. During the attempt, what is the pressure difference (in kPa) between the external pressure on the diver's chest and the air pressure in the diver...

Physics

A clown at a birthday party has brought along a helium cylinder, with which he intends to fill balloons. When full, each balloon contains 0.00410 m3 of helium at an absolute pressure of 1.30 x 105 Pa. The cylinder contains helium at an absolute pressure of 2.40 x 107 Pa and ...

MODEL CONGRESS!!!

PLEASE!!!! SOMEONE HELP ME!!!! I NEED TO KNOW HOW MANY MEMBERS OF CONGRESS THERE ARE!!!!I ONLY NEED TO KNOW A NUMBER!!!!!!PLEASE HELP!!!!

PLEASE HELP!!!!!

What is the distance (in miles) from Ny to Europe? It doesn't matter what place. Just the distance in miles or anything else. PLEASE!

chemistry-Please confirm this

I'm pretty sure that OH- has a bond order of 1. OH+ has a bond oder of 1. confirm this please.

SOCIAL STUDIES PLEASE HELP

please read what i have posted for social studies below, I need help.

math graphing the y-intercept

2 y=- +1 3 dont know how 2 solve it 2 get the y-intercept dont know how 2 graph it please help and explain it please help

math graphing the y-intercept

y=2/3=1 dont know how 2 solve it 2 get the y-intercept dont know how 2 graph it please help and explain it please

Math

I really, really need help! Solve for the indicated variable. 8x+4y=12 Solve for y. Explanation too, please! Please and thanks!

PLEASE HELP ME...geology

PLEASE CAN YOU HELP TO DESCRIBE BOTH. THE FELDSPAR FOUND IN GABBRO AND FELDSPAR FOUND IN GRANITE.

English

Which one is more grammatically correct? Please remove your shoes. -or- Please, remove your shoes.

math help please

Find the area of the Rectangel. . 7x+1 ------------- | |8x | | | | ------------- A.15x+1 B.56x^2+8x C.56x+8 D.15x^2+9x I don't know what to do please help me. I don't understand.

tips.

Please show your work. Tutors will not do your homework for you. Please show your work for any question that you are posting.

Physics

A ball (m = 250g) on the end of string swings in 1.2 m radius that tolerates 20 N. At what speed does the string breaks if a) the rings swings horizontally ? b) the rings swing vertically? I think I got a) right: T=mv2/r ---> v=(sqr)Tr/m v=(sqr) 20x1.2/0.25= 9.8 m/s Given ...

physics

1.A 910 kg racecar starts from rest and reaches a speed of 25.1 m/s in 0.48 s. a)What is the average acceleration of the racecar during this time period? b)What is the magnitude of the net force on the racecar? for a) I know: Mass= 910kg V=25.1m/s T=0.48s and I know to find A...

Physics

Please help..... When something is thrown over a large distance (on earth ) what new factor comes into play? 1- The decrease in gravity over long distance 2- The increase in gravity over long distance 3- The tendency of thrown objects to fall to the ground 4- The difference ...

us history

agree or disagree? During the 1920 stock amrket crash, tbankers invested their depositors money in unsound investments. Please note that we don't do students' homework for them. Once YOU have come up with a response to YOUR questions, please re-post and let us know what you ...

ethn: Need info please

please direct me to some to the websites where I can get information for the question beloow: Leaders of the civil rights and black power movement and their contributions to their respective causes. How did these social pioneers forge the way for this important ratification? ...

conics

The graph of y=x^2 is reflected in the x-axis, then stretched vertically by a factor of 2, and then translated 3 units to the left and 1 unit down. I need to write the equation of this parabola in standard and general form. I have 4 other questions so could someone please show...

MATH HELP

Law of Gravitation- Find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is neglected. The gravitational constant for g is, G = 6.67428*10^-11 m^3 Kg^-1 s^-2 Please answer the question fully ...

English

The smugglers stood before the judge, who was known for her strict manner, and entered their pleas with feint hopes that the evidence would not prove their guilt. Which of the following homophones should be used to correct the error in the sentence above? A. Gilt B. Faint C. ...

physics waves transverse longitudinal

i real stuck on this and i really want explanations please. in which sprind do transverse waves travel faster, small diameter spring or slinky? i think this be the transverse waves but i not know how to explain why. in which spring do longitudinal waves travel faster? i think ...

PLEASE HELP TANGENTS AND CIRCLES PROBLEM GEOMETRY

PLEASE HELP I REALLY NEED HELP. Each of the three circles in the figure below is externally tangent to the other two, and each side of the triangle is tangent to two of the circles. If each circle has radius three, then find the perimeter of the triangle. The figure is ...

Thanks

I would just like to sat thanks to drwls for helping me a bunch with the physics questions...AP physics is pretty hard..thanks again, whoever you are.. I am sure i will be back plenty of times!

Physics HS

Doing a physics lab on elastic material - Asked to list at least three sources of error in measurments and/or laboratory technique. I really do not understand what teacher is looking for?

physics

In a paragraph, use the following words: Inertia, Acceleration, Kinetic Energy, and Newton's 1st Law to describe the physics at work during a car crash

physics

In a paragraph, use the following words: Inertia, Acceleration, Kinetic Energy, and Newton's 1st Law to describe the physics at work during a car crash

Physics 11 question pls urgent HELP!!!!!

The 1205 kg physics dragster is traveing ay 35km(easy) when it hits the gas and accelerates at 12.5 m/s^2 for 3.25s. What is change in momentum during this time?

Physics

"An alpha particle (a helium nucleus) is traveling along the positive x-axis at 1 250 m/s when it enters a cylindrical tube of radius 0.500 m centered on the x axis. Inside the tube is a uniform electric field of 4.50 X 10^-4 N/C pointing in the negative y direction. How far ...

Physics

A wooden bridge crossing a canyon consists of a plank with length density λ = 2 kg/m suspended at h = 10.0 m below a tree branch by two ropes of length L = 2h and with a maximum rated tension of 2000 N, which are attached to the ends of the plank, as shown in the figure. ...

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