physics please HELP !
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Physics PLEASE HELP
A 80 kg child sits in a swing suspended with 2.6 mlong ropes. The swing is held aside so that the ropes make an angle of 46 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go. 
physics
1. When an ideal gas is expanded adiabatically in volume at constant pressure, the average kinetic energy of the gas molecule: A. Increase B. decreases C. Does no change i know the answer is B but can someone explain why please? i thought it does not change since its ... 
physics
When 1.60 multiplied by 105 J of heat enters a cherry pie initially at 20.0°C, its entropy increases by 470 J/K. What is its final temperature (C)? I use delta S = entropy change = 1.6*10^5*[1/293  1/T2] = 470 Solve for T2, but it's not correct. Please someone help me to ... 
physics
How fast must a ball be rolled along a 100 cm high table so that when it rolls off the edge it will strike the floor at a distance of 100 cm from the point directly below the table edge? Please show work. 
Physics
How do I get the final velocity from Vf^2 = Vi^2 + 2ad. Here are my following numbers: Vi= 0.3048 m/s Vf= ? d = 22.86 m a = 166 m/s^2 t = Not required Based on the numbers I have would I set it up this way??? Vf^2= 0.3048^2 + 2*(166*22.86) This process comes out to an ... 
Physics
The problem statement, all variables and given/known data A body is thrown upward and remains in air for 10 seconds , the initial velocity at which it was thrown in is? The attempt at a solution g = 10 , t = 10 s , vf = 0 , vi = ? Vf = vi + gt 0=vi + (10) (10) Vi = 100 but ... 
science,physics
Jesse Rose walks along a footpath for 6 minutes.She then cuts across a field, which takes a further 4 minutes.She walks a total distance of 900m. what is her average speed? could you please explain this step by step. 
Physics
A 22 kg suitcase is being pulled with constant speed by a handle that is at an angle of 23 ∘ above the horizontal. If the normal force exerted on the suitcase is 150 N , what is the force F applied to the handle? I don't understand how the equations are suppose to be ... 
algebra
please help me i'm close to having no hair left. How do you rearrange 6y = 9  3x to make x the subject i've been at this now for at least 1 week and this is my last resort please please help you have been at this for at least 1 week ?? 6y = 9  3x (add 3x to both sides) 3x = ... 
Science
Can any one please please help me with popcorn experiment homework? The materials and 1 pack of Orville and 1 movie theater popcorn and let say the timing for both were 4.5 minutes. 1 what is the variables would you need to keep constant(control) in you experiment? Please ... 
AP Physics
A mystery surprise box is sliding down a ramp at a constant speed. The box has a mass of 55.0kg and the ramp makes a 40.0œ angle with the horizontal. What is the coefficient of kinetic friction between the box and the ramp? Please help asap. Thank you. 
English
1. You should turn off the computer and go to bed now. 2. Ten more minutes, please. 3. Give me ten more minutes, please. 4. Wait ten more minutes, please. 5. __________________________  #2 is the response to #1. Does #2 mean #3 or #4 or ... 
physics
a 1000 kg truck traveling at a speed of 40m/s skids to a halt on wet concrete where µk = 0.60. how long are the skid marks? (Please explain all variables and equations I'm clueless in this subject) I keep trying to use the equation I found online: d= v^2/2ug but I do not ... 
physics (please help I have a test tmrw)
How much thermal energy is released when 500g of steam at 100 degrees C condenses into liquid water and then cools to 50 degrees C? I tried to solve q=mct for q and then use that in the q=mLv formula but it didn't work. The answer is 1.3x10^6J Help would be appreciated! Thank you 
Physics
The rms speed of a sample of gas is increased by 5% . What is the percent change in the temperature of the gas? What is the percent change in the pressure of the gas, assuming its volume is held constant? please help!! 
Physics
E2 (total) of rod (of length L = 9.15 mm) = 4.18 ×10^3 V/m. E1=1.76 x 10^3. E3=1.57 x 10^3. The rod consists of three sections of the same material but with different radii. The radius of section 3 is 2.27 mm. What is the radius of (a) section 1 and (b) section 2? If someone ... 
PHYSICS
The rms speed of a sample of gas is increased by 8% . What is the percent change in the temperature of the gas? What is the percent change in the pressure of the gas, assuming its volume is held constant? PLEASE HELP 
Physics
Please help! suppose you have some 20 degrees celsius water and some boiling water. How much of each would you use to make 4 kilograms of water at 45 degrees celsuis? 
Physics
A person drops a small rock from a bridge. If it takes 1.70 seconds for the rock to reach the water below the bridge, how high was the bridge above the water? please explain. 
Physics
What is the direction of the particle’s velocity at time t = 3.4 s? Please specify this direction as an angle (between −180 ◦ and +180 ◦ ) from the x axis. Answer in units of ◦ 
Physics please help!!
A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.23 hours. What is density of the planet? Assume that the planet has a uniform density. 
Physics Plz help me
If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you 
physics
Please someone should help me with this. An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is ? 
physics
Two children with masses of 18 kg and 36 kg are sitting on a balanced seesaw. If the heavier child is sitting 0.45 m from the center, at what distance from the center is the lighter child sitting? Answer in units of m. Please help !!! 
PHYSICS!!!
A climber with a mass of 75 kg is attached to a 6.5 m rope with a cross sectional area of 3.5×10−4 m2. When the climber hangs from the rope, it stretches 3.4×10−3 m. What is the Young's modulus of the rope? Please help me :) 
physics
A gammaray photon produces an electronpositron pair, each with a kinetic energy of 275keV . What was the energy of the photon? E=in MeV What was the wavelength of the photon? wavelength in m Please help thank you! 
Physics
A gammaray photon produces an electronpositron pair, each with a kinetic energy of 275keV . What was the energy of the photon? E=in MeV What was the wavelength of the photon? wavelength in m Please help thank you! 
Physics
When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!! 
Physics
When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!! 
More Rational Exponents!
1. The optimal height h of the letters of a message printed on pavement is given by the formula . Here, h= (0.00252d^(9/4))/e d is the distance of the driver from the letters and e is the height of the driver’s eye above the pavement. All of the distances are in meters. ... 
English
1. This is all that I have now. 2. This is what I have now. (Are both the same in meaning?) 3. Please show me that he is active. 4. Please show me the fact that he is active. 5. Please show me that this is correct. (Are the three sentences grammatical? 
URGENT Needs Physics Help
Ok, so I am doing this paper on the physics mistakes in Willy Wonka and the Chocolate factory. To prove that the everlasting gobstopper defies the laws of physics, I wanted to use Zeno's paradoxes to do so. But are his paradoxes correct? There are theories online that say they... 
Urgent Needs Physics Help
Ok, so I am doing this paper on the physics mistakes in Willy Wonka and the Chocolate factory. To prove that the everlasting gobstopper defies the laws of physics, I wanted to use Zeno's paradoxes to do so. But are his paradoxes correct? There are theories online that say they... 
physics (please help)
Four 20 ohm resistors are connected in parallel and the combination is connected to a 20 V emf device. The current in any one of the resistors is: A) 0.25 A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 A I get B V=IR I= 20V/20 ohms = 1 A for any one of the resistors thank you correct. 
physics
A student drops a ball from the top of a tall building; the ball takes 2.8 s to reach the ground. 1. what was the ball's speed just before hitting the ground? 2. What is the height of the building? help please? 
Physics(Please respond)
A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source, the intensity of the sound is 1.7 × 103 W/m2. What is the total sound power P emitted by the source? Would I do 1.7e^3 (12) ? 
physics
A boat sails 5.0(45 degrees W of N). It then hanges direction and sails 7.0km(45 degrees S of E) where does the boat end up with reference to its starting point.? Please explain steps answer is 2km(45 degrees S of E) 
physics
Gravitational Attraction 1. The centers of two 11.80 kg spheres are separated by 0.09 m. What is their gravitational attraction? 2. What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? Please answer both, I'd be greatful. ... 
Physics Help Please  Urgent
A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an insect is now placed 16 cm from this lens, how far FROM THE INSECT will its image be formed? A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm 
Physics
Can you please help me with the following questions? please. 1. how much work do you do on a 25kg backpack when you walk a horizontal distance of 100 m? I got 2,500 J 4. if you friend pushes a lawnmower four times as far as you do while exerting only half the force, which ... 
physics
For an interesting physics field trip, we visit Tahquamenon Falls in the Upper Peninsula. We measure the horizontal speed of the water at the top of the falls to be 3.98 m/s. How far vertically below the top edge of the falls does the velocity vector of the water point ... 
Physics
Can you please help me with the following questions. Thanks! How does Rutherford's model of the atom acoount for the backscattering of alpha particles directed at the gold leaf? What is Bohr's key idea (involving matter waves) that makes the Bohr atom have discrete engergy ... 
Physics
A small plane takes off with a constant speed of 130 km/h at an angle of 37 degrees. In 3.00 s, how high is the plane and what horizontal distance has it traveled from the liftoff point. I know I should convert 130km/h into meters per second, but after that I am stuck. Can ... 
physics
Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 m long. The first moves past her in 2.05 s and the second in 1.73 s. Find the constant acceleration of the train. _____m/(s^2) Please explain this... 
physics
A mass of 1.1 kg is attached to two cords. The cords are each an angle 30 degrees above and below the horizontal, The mass circles around the vertical pole at a fixed speed of 15 m/s in a circle of radius 0.50 m. How do I calculate the magnitude of the net force and the ... 
physics
A stone is thrown vertically upward with a speed of 11.5 m/s from the edge of a cliff 95.0 m high. (a) How much later does it reach the bottom of the cliff? (b) What is its speed just before hitting? (c) What total distance did it travel? For (c), the right answer is 108.46 m... 
physics
A stone is thrown vertically upward with a speed of 11.5 m/s from the edge of a cliff 95.0 m high. (a) How much later does it reach the bottom of the cliff? (b) What is its speed just before hitting? (c) What total distance did it travel? For (c), the right answer is 108.46 m... 
physics
A stone is thrown vertically upward with a speed of 11.5 m/s from the edge of a cliff 95.0 m high. (a) How much later does it reach the bottom of the cliff? (b) What is its speed just before hitting? (c) What total distance did it travel? For (c), the right answer is 108.46 m... 
Physics
A rotating space station has radius 1270 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh onehalf their Earth weight? I got 101.1 seconds... is this correct? Please help! 
Physics STUCK!
A point on the A string of a guitar oscillates in approximately simple harmonic motion with a frequency of 113 Hz and an amplitude of 1.04 mm. Find the maximum speed and acceleration of this point. SOLVE FOR: vmax = amax Can you please provide me with the equation as well as ... 
Physics
2. Determine the quantity of heat required, to raise 11.100kg of water at 80.000 degrees Celsius, to saturated steam at 2250.000kPa and 71.400% dry. ANS = kJ Not sure where to start. I need a little help please. I do have a chart with the properties of saturated steam. Thank you. 
physics
1. While strolling along on unknown planet, an astronaut decides to throw a hammer and a feather upwards at 5.0 m/s. They both return to the point of release in 3.0 s. What is the acceleration due to gravity on Planet X. 2. Marii jumps straight upward at 15.0 m/s. How high is ... 
Physics
A car accelerates a form an initial speed to higher final sped while the engine puts out constant power. During this time period, magnitude of the car's acceleration was .. a increasing b decresing c constant d unpredictable please explain why also. 
Physics
An elevator (cabin mass 600 kg) is designed for a maximum load of 2700 kg, and to reach a velocity of 3.4 m/s in 5 s. For this scenario, what is the tension the elevator rope has to withstand? I know I have to multiply the mass by the acceleration. I'm having a hard time ... 
Physics
Initially a battery circuit consists of a 25 ohm load connected to a battery with 3 ohms of internal resistance and the circuit draws 1.5A of current. What is the terminal voltage and EMF of the batter? How much (%) power is wasted? Please help, this doesn't make sense given ... 
Physics
Please help me with this its very hard to visualize the problem. The analytical method of adding vectors expressed in terms of their components may be applied to vectors in three dimensions, for which graphical work is inconvenient. Find the magnitude of the resultant of the ... 
Physics
Jane swings on a 30m long vine initially inclined at an angle of 37o from the (downward) vertical. What is her speed at the bottom of her swing if a) she starts from rest? b) she pushes off with an initial speed of 4 m/s? Help please. Show the equation and then plug in the ... 
English
Can you please tell me if I made any mistakes in the following sentences? Thank you very much for your help. Thank you for your corrections. Can you please check the grammar in the following letter, please? 1) Do you think you can help me find a school in your area which could... 
Physics(Please help)
The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level â of the louder sound? I am not sure how to start this. Thank you. 
Physics drwls please help
Please tell me where I am going wrong. A 59.5 kg person, running horizontally with a velocity of +3.90 m/s, jumps onto a 12.2 kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move ... 
physics
Damped mass spring system oscillates at 205 Hz. The time constant of the system is 6.6s. At t=0 the amplitude of oscillation is 4.7 cm and the energy of the oscillating system is 26J. What is the amplitude of oscillation at t=9.9s? Answer in units of cm please help 
Physics
A man jogs at a speed of 1.7 m/s. His dog waits 2.5 s and then takes oﬀ running at a speed of 4.1 m/s to catch the man. How far will they have each traveled when the dog catches up with the man? help me set up the equations please! 
Physics help
I'm trying to calculate the tension in a rope. The two ropes are holding up a picture frame that is 100N, each rope is at a 45 degree angle. I'm trying to find the value of the tension of the 1st rope. Please help 
Physics please help me (:
Calculate the change in internal energy of a system if 25000 J of heat is added to the system while the system does 40000 J of work on its surroundings. Does this represent an increase or decrease of internal energy? 
Project help.
Please help. I need to find a picture showing the theme of the book of Jonah. Please help. thanks Thank you for using the Jiskha Homework Help Forum. Here you go! 1. 
biology
please could somebody point me in the right direction here... i need to find out why xylem is described as a tissue... please could someone help me! 
education
I needs some help please, I need to create a list of the top ten characteristics of a multicultural school environment. Could someone help me please? 
PLEASE HELP ME!
Rewrite each polynomial as the product of two binomials. 1. y^2 + 6y + 9 2. 25x^2  10x + 1 3. 36  y^2 I don't understand how to do these problems, especially what the direction is telling me to do. Someone help me please? 
Algebra (please help!)
Find an equivalent inequality with absolute value #1: 5 < y < 5 #2: x < 4 or 4 < x I'm not sure at all how to solve this problem. Please walk me through the process. Thanks! 
english
when the legends die by hal borland when tom reflects that he succeeded in killing the past, what does he mean? why did he need to kill it, and how did he? please please help me . 
science
hi can someone please help me. I need a scientific article with an author that is about ozone depletion. I have been looking forever. Please help thank you 
Algebra.. please help
Please help. I have been trying to figure this problem out for an hour now. Solve the following system of equations. X + 8y = 5 (1) x=88y (2) 
Algebra 2 URGENT PLEASE HELP
find an equation of the linear function f using the given information. please show all steps and work f(1)=1, f(1)= 2 
Chemistry
I..don't understand any of this: 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 with this! Thanks MC 
calculus
can someone please help me with these 3 questions: 1) Evaluate the limit. lim_(x>infinity) (ln(ln(4 x)))/(4 x) 2)Find y ' and y ". y= ln(5 x)/x^7 3)y =(arctan)(x  sqrt(1+x^2)) for this question i got y = 1/(2(1+x^2))which was wrong. Please and thank you! 
Biology/help please
I am a being from another planet, please explain to me which is alive: a clock or a fish? Compare the two, similarities and differences.Can you help me answer this question ? thank you. 
Calc
The total area enclosed by the graphs of y=10x^2x^3+x y=x^2+19x Please Please help me solve this. I have done it amny times, but getting it wrong 
7th lang arts
Hi! Um.. What is the synonym of length? Please choose from this list: acute duration fidelity headstrong pacify refute Please help!!! Thank you!! 
Science
Please Help Thank you. If you had to argue the benefits of wind energy, what would they be? and What are the risks? can you please answer these question in 120 words or more Thank you. 
English please help
please help if my ansers are correct. 1. substantive first 2. copyeditngsecond 3.proofreadingthird 4.revisingfourth thank you very much 
Algebra(please help)
Will someone please help me withthis question I couldn't solve it. What is the length of the segment whose endpoints are A(2, 3) and B(10, 7)? a)2 Sqrroot29 b)2 Sqrroot41 c)4 Sqrroot2 d)2 Sqrroot5 
mathURGENT!!!!!!
what is the greatest value of m such that 25!/5^m is an integer? hint: the exclamation point means "factorial". 3!=3*2*1=6 4!=4*3*2*1=24 etc. please answer and explain how you got it!!!!please??? 
math
No idea. Please help. Is 20 times 5/6 g reater than or less than 20? How do you do it? Second question What is 4/5 of 2/3?It shows a square and says find answer on the model. Any help, please 
statisticsPLEASE HELP quick
I have less than 24 hours to find the binomial probability of P(20<x<23)= and P(x>23)= if n=30 p=.23 u=6.9 q=.77 and the standard deviation is 2.3 can someone please show me how to get the outcome they want? 
Science ~ Structures and Properties of Matter
How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot? Help ME PLEASE! PLEASE 
Help please, :)
I was wondering who won the French and Indian War, I decided to ask my mom, and my little sister says.. George Washington!! well, I know that isn't the answer, haha, help please? 
Social Studies help please!!
Explain how transportation innovations of the time period affected migration patterns in the united states. Can someone help me with this please? 
physics
I have 2 fill in the blanks that I need help with. 1) When electrons are forced away from a/an ___ plate, work is done. could the answer be positive? 2) Any pointed or angular surface of an object must have a/an ___ concentration of charge to establish equilibrium. I do not ... 
Physics
A block of mass 77.0kg is placed at the top of a frictionless plane that is inclined 46 degrees to the horizontal. The height of the plane is 23.0 meters. Find the speed of the block at the bottom of the plane. Please show all your steps, don't just suggest a formula. Thank ... 
Physics
we have a test coming up and I cannot figure out the practice question. Can somebody please help? Aaron throws a 7.5 kg bowling ball by applying a 45 N force for a time of 0.90seconds. What is the impulse Aaron applies to the ball? What is the ball's speed at the end of this ... 
Physics
A 54.0g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 18.0 m/s. A highspeed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval in ... 
physics multiple choice MCQ 2 i need help please @all respective sir & bro
which of the following laws is applicable for the behavior of a perfect gas? a. Boyle's law b. Charles' low c. GayLussac law d. all of the above e. joule's law 
AP Physics Word Problems ASAP!
Could you please help me out with the following problems please? If a rocket initially at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be ? ( I know there are 60 seconds in 1 minute, so would I just use the formula, d=vt, and I would get 3000 m/s) It ... 
Physics
A stone is aimed at a cliff of height h with an initial speed of 62 m/s directed 45° above the horizontal, as shown in the Figure below. The stone strikes at A, 6.56 s after launching. What is the height of the cliff? Can someone please tell me which equation(s) I need to use... 
physics
Three moles of an ideal gas are compressed from 5.5*10^2 to 2.5*10^2 m^3. During the compression, 6.1*10^3J of work is done on the gas, and heat is removed to keep the temperature of the gas constant at all times. Find the temperature of the gas. Can anyone please give me ... 
PHYSICS
Three moles of an ideal gas are compressed from 5.5*10^2 to 2.5*10^2 m^3. During the compression, 6.1*10^3J of work is done on the gas, and heat is removed to keep the temperature of the gas constant at all times. Find the temperature of the gas. Can anyone please give me ... 
physics
please help me with this question " king kong carries a Fay Wrap up the 321mtall empire state building. at the top of the shyscraper, Fay Wrap's shoe falls from her foot. how fast will the shoe be movinig when it hits the ground?" 
Physics
An odometer in a car has a reading of 50 km at the beginning of a trip and a reading of 125 km half an hour later. What is the average speed of the car? Textbook ans: 150km/h Please can someone help me solve this problem? I don't know how to solve it. Can you show me steps (... 
college physics
The intensity of an earthquake wave passing through the Earth is measured to be 2.5×10^6 J/m^2 at a distance of 43 km from the source. What was its intensity when it passed a point only 2.0 km from the source? AND At what rate did energy pass through an area of 4.0 m^2 at 2.0... 
Physics please help!!
A car starts from rest and travels for 5 seconds with a uniform acceleration of 2m/sec^2. The driver then applies the breaks causing a deceleration of 1.5m/sec^2. If the breaks are applied for 4 second, how fast is the car going after the breaking period?