physics please HELP !
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Physics Plz help me
The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second. WHat is the mass of the sample? m= in grams PLease help me out...Thank you! :) 
physics
a body of mass m accelarates uniformly from the rest to velocity v1 in time t,find the expression for instantaneous power deliver to the body as the function of t?.......can any one help me with this......please..... 
physics
a body of mass m accelarates uniformly from the rest to velocity v1 in time t,find the expression for instantaneous power deliver to the body as the function of t?.......can any one help me with this......please..... 
Physics (Please Help)
d1 = 2.53 cm +/ .05 cm d2 = 1.753 m +/ .001 m 0 = 23.5 degrees +/ .5 degrees v1 = 1.55 m/s +/ .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. d1 (tan (0)) 
Physics
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 4.70 m/s2. What angle does the ramp make with respect to the horizontal? Please show steps... 
Physics
The mass on a pendulum is given 20 J of potential energy. If the mass is 2 kg, how high, in meters, was it raised? Please round your answer to the nearest whole number and use g = 10 m/s2 
sciencephysics
a ray of light traveling from the air into crown glass strikes the surface at an angle of 30 degrees. what will the angle of refraction be? please help me!! don't ignore this ! 
physics
a 1kg object moving east with a velocity of 10 m/s collides with a .50kg object that is at rest. neglecting friction, what is the momentum of the system? please show work 
physics
What conditions must exist for a converging lens to produce a real image of an object that is larger than the object itself? Please respond with 3  4 complete sentences. 
physics
Find the turn ratio in a transformer which deliver a voltage of 120volts in the secondary coil form a primary voltage at 60v. Please someone should help me with this 
Physics
A resistor R is connected to a 12 V battery. The total current increases five times when a 400 Ohm resistor is added in parallel with it. The value of resistance R is? Please help me. 
physics
Radon 86222Rn is a radioactive gas with a halflife of 3.82 d. If there are initially 400 decays/s in a sample, how many radon nuclei are left after 2 d ? Please help, I don't understand how to do this. 
physics
Starting from rest, a rope with a tension 30 N pulls a 2.0 kg box up a 2.0 m long, 30 degree smooth incline. What is the speed of the box at the top? Please show steps! Thanks 
physics
Can anyone please help me with this? Find the force acting on a 12,500 kg F4 Phantom jet in the following situations: 1. It is catapulted from rest to 250 km/hr in 2.2 seconds. How can I find the acceleration for this problem?? 
Physics Please help
A thin, horizontal 20cm×20cm copper plate is charged with 1.7×10^10 electrons. Consider the electrons are uniformly distributed on the surface. A. What is the strength of the electric field 0.1 mm above the center of the top surface of the plate? E=____ N/C B. What is the ... 
SOCIAL STUDIES HELP PLEASE!!!
Can you guys please help me with this i don;t understand it plzz how did the supreme court decision in Worcester V.Georgia and the Indian removal act lead to the removal and resettlement of native Americans groups? Can you explain it to me or give a link or something please??! 
Physics
Hi, just need a little help with this physics question please. A cylindrical tank of water is located 68m deep in water. An air lock at the bottome of the tank allows access. The sailor must wait while the air pressure in the lock is increased until it equals the water ... 
Physics
You want to push a 66kg box up a 30° ramp. The coefficient of kinetic friction between the ramp and the box is 0.35. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed? N Physics  bobpursley, Thursday, ... 
Physics
You want to push a 66kg box up a 30° ramp. The coefficient of kinetic friction between the ramp and the box is 0.35. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed? N Physics  bobpursley, Thursday, ... 
Physics
If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes sense to include ... 
Physics
If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes sense to include ... 
physics
Posted by sandhu on Wednesday, November 24, 2010 at 4:29am. The firetruck goes around a 180°, 162 m radius circular curve. It enters the curve with a speed of 12.6 m/s and leaves the curve with a speed of 38.8 m/s. Assuming the speed changes at a constant rate, what is the ... 
physics... PLEASE HELP
In a particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.7 × 10 27 kg. What is the force on the proton 
physics please help!!
A beam of microwaves with = 0.7 mm is incident upon a 12 cm slit. At a distance of 2 m from the slit, what is the approximate width of the slit's image? 
Physics
Last question i'm stuck on please help me through this. Five waves pass a dock in 2.0 s. If the waves are traveling at 10.0 m/s, then what is the wavelength of the waves? 
Physics
Physics question on identify the reaction? I am having trouble with the question a, b, and c in this physics problem: One or more external forces are exerted on each object enclosed in a dashed box shown in the figure below. Identify the reaction to each of these forces. (... 
physics
An elastic collision occurs between two air hockey pucks in which one puck is at rest and the other is moving with a speed of 0.7 m/s. After the collision, the puck initially in motion makes an angle of 20.00 o with its original direction, and the struck puck moves at an angle... 
Economics
Hi, Please I researched so badly, I need help to find information about Cybernomics issues and solutions. Please can you help me. Give me a site I can go to that will have information concerning Cybernomics. Please Thank You. 
math
1) Write a translation rule that maps point D(7, –3) onto point D'(2, 5). Note: PLEASE ANSWER, NEAT & CORRECT PLEASE AND THANK YOU!! =) :) AND EXPLAIN IT GOOD STEP BY STEP, PLEASE. :) 
Physics
I'm trying to solve a Physics problem. I already got the answer correct but I'm unable to do the uncertainties. Can someone please explain how to do in this case? These are the variables used. g = 9.802 m/s2 +/ 0.0005 m/s2 m2 = 951.0 g +/ 2.3 g θ = 31.90º +/ 0.07º ... 
Social Studies 9
Can someone please help ! CAN someone please list the similarities between pioneers (American rev.) and Puritans & Jacobins (French rev.) NO links please :] 
Physics
James and Steve have a contest to see who can kick a football further. James kicks the football at an angle up of 57 degrees, and a speed of 75m/s. Steve kicks the ball with a speed of 100m/s, at an angle up of 48 degrees? Who wins the contest? Please show what each variable ... 
physics
A remotecontrolled toy car of mass 2.2 kg starts from rest at the origin at t = 0 and moves in the positive direction of an x axis. The net force on the car as a function of time is given by the figure. (a) What is the time rate of change of the momentum of the car at t = 3.0... 
physics
In deep sapce( no gravity), the bolt( arrow) of a crossbow accelerates at 189 m/s2 and attains a speed of 127 m/s when it leaves the bow. For how long is it accelerated? Answer in units of sec. PLEASE HELP! SO LOST! 
physics!
Suppose the amplitude and frequency of a transverse wave are, respectively, 1.3cm and 5.0Hz. Find the total vertical distance (in cm) through a fixed point in 3.0s. PLEASE GIVE ME SOME IDEAS TO DO IT!!!THANKS A LOT!!!!!!! 
Physics
A 1500 kg truck travels at 30m/s. It faces a force of 400 N from air resistance, what is the car's average power output? Is the answer 675 kw?If not please help me in any way you can,by showing the formula you used. 
AP Physics B
The position of a 20 g oscillating mass is given by x(t) = (2.0 cm) cos(2t), where t is in seconds. Determine the following. The Amplitude (cm.) The Period (s.) The Spring Constant (N/m) The maximum speed (cm/s) The total energy (J) The velocity at t=0.40 s. (cm/s) I need your... 
college physics
A 22.1 kg child descends a slide 3.4 m high and reaches the bottom with a speed of 2.4 m/s. How much thermal energy due to friction was generated in this process? I'm not sure where to even start this problem. Please help. 
Physics
A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you 
physics help!!!
A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you 
physics help!!
A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you 
physics
Dynamics question please help i am stuck...! A model helicopter of mass 5.0 kg rises with constant acceleration from rest to a height of 60 m in 10 seconds. Find the thrust exerted by the rotor blades during the ascent 
Physics
A bullet is ﬁred straight up from a gun with a muzzle velocity of 259 m/s. Neglecting air resistance, what will be its displacement after 8.9 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m. Please show work 
physics please help!!
find the temperature of the hot reservoir of a carnot engine that has QH=1575j that does work on a 200kg crate, caussing it to go from rest to a velocity of 2.35m/s along the horizontal frictionless surface. Tc=100K 
Physics
Use the WorkEnergy Theorem to show that an object with initial velocity vo will travel a distance d across a rough horizontal surface before stopping, where d = vo2/(2mKg). Help ASAP please!! 
Please Check(Math)
d+7/d^2+49= / (d+7) (d+7)*I got the bottom but I don't know what to put at the top...please help!!! Please HElp Me!!Sorry,I am trying to e patient... The d+7 on top cancels with one of the d+7 on the bottom and you are left with 1/(d+7) 
Physics !!
3)A car increases its speed from 5 m/s to 35 m/s in a distance of 75 m a)what is the acceleration of the car? b)How long did it take the car to travel the 75 m? someone PLEASE help me willyah! 
physics
what is physics? i know that its subject but what is definition of physics? The study of matter, energy, space, and time, and the interactions thereof. 
Physics please clarify
A charge of +2q is fixed to one corner of a square, while a charge of 3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each of the two empty corners? For Further ... 
11th grade English
Can someone please help me with the topics for a research paper. It needs to be based on some medical issues. This is the first time I am writing a research paper. please help me with a topic. Please!!!! 
Physics
Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula d=vi*t+1/2*a*t^2 The ... 
Physics
Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula d=vi*t+1/2*a*t^2 The ... 
RE: PHYSICS
A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to the flatcar. What is ... 
physics!
A battery has an emf of 8V and an internal resistance 2ohms. If it is connected to an external circuit that draws 6W of power, what is a possible current in the circuit? Please give me some ideas to do it! THANKS! 
physics
If the grating is not properly aligned, what are the consequences on the average angular displacement and wvelength reading? Please elaborate. How do grating constants affect the observed spectral lines? 
physics
please help me by showing steps thanks Assuming atmospheric pressure to be 1.01 * 10^5 Pa and the density of sea water to be 1025 kg/m^3, what is the absolute pressure at a depth of 15.0m below the surface of the ocean? thanks again:) 
physics
PLEASE HELP!! I HAVE A TEST TOMORROW!! if Q=30 uC, q=5.0 uC, and d=30cm, what is the magnitude of the electrostatic force on q in N? (Ke= 8.99 x 10^9 Nm^2/C^2) (uC= micro coulombs) (u= 10^6) a. 15 b. 23 c. zero d. 7.5 e 38 i don't know where to start with this problem. i don'... 
physics
a 0.40kg ball is thrown vertically upward with a speed of 30m/s. The ball reaches a height of 40m. What is the energy dissipated due to air friction?... please help i don't know what to do:( 
PHYSICS
A steel ball is dropped from a hight of 50 m ,how far does the ball travel during the 3rd second of the fall. my anweres was 2.0, but that's not right, im confused where i went wrong please help thanks 
Physics
Please help me solve this! The spectrum of the sodium atom is detected in the light from a distant galaxy. If the 590.0 nm line is redshifted to 658.5 nm, at what speed is the galaxy receding from the Earth? 
Physics
When an object is moved from sea level to the top of a really high mountain, what, if anything changes about the weight of the object? Could someone please help me explain this problem. THANK YOU!!! 
physics
please help i have to turn this in by 10PM a bucket of mass 2.20 kg is whirled in a vertical circle of radius 1.55 m. At the lowest point of its motion the tension in the rope supporting the bucket is 28.0 N. 
physics
If the roller coaster track has a hill at the end that was equal in height to the original hill, would the marble make it all the way to the top? Please explain it to me! Thanks. 
Physics
Compute the torque about the origin of the gravitational force F = −mg acting on a particle of mass m located at r = x + y. (Use the following as necessary: m, g, x, and y). Torque = F (cross) r Please help 
Physics
3 charges sit on vertical equilateral triangle the side of each is 30.0 cm. if the triangle are A= +4.0 uC B=+5.0 uC and C=+6.0 uC (clockwise from top) what is the force on each charge? Can someone please explain me in detail i am really confuse :((( 
physics
An RV travels 45 km east and stays the night at a KOA. The next day it travels for 3 hours to the north, traveling 110 km. What is the displacement over the two days for the RV? Please help, thank you! 
Physics
A car starts from rest on a curve with a radius of 110m and accelerates at 1.2m/s^2. Through what angle will the car have traveled when the magnitude of its total acceleration is 2.1 m/s^2? Steps please. 
Physics Can you please help me due soon
A Carnot engine operates between 170°C and 23°C. How much ice can the engine melt from its exhaust after it has done 4.5 104 J of work? _____kg 
Physics
Why bother using a machine if it cannot multiply work input to achieve greater work output? Please help; need a original answer no Google search. Thank you in advance... 
Physics (Please Help)
d1 = 2.53 cm +/ .05 cm d2 = 1.753 m +/ .001 m 0 = 23.5 degrees +/ .5 degrees v1 = 1.55 m/s +/ .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. Z = 4d1 (cos (0))^ 2 
Physics check answer please
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? a) 0.05 mm b) 5.0 mm c) 15.mm d) 20.mm e) 180 mm my answer: I got 10 mm but it is not listed as an option 
physics
what is the average pressure and average thrust on walls of the tank of cubical dimension of each side 4 m filled with water upto the brim. given g = 10 m raised to 2 . Please help this is urgent 
Physics
If toy rocket rises vertically and then falls back to the ground, what changes occur in the rocket's velocity and acceleration. Please give a sentence explanation not a formula 
physics
During a baseball game, a batter hits a high popup. If the ball remains in the air for 6.65 s, how high does it rise? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m CAN ANYONE HELP PLEASE ??????!!! 
physics
A particle of charge +18.1C and mass 7.06 × 105 kg is released from rest in a region where there is a constant electric field of +414 N/C. What is the displacement of the particle after a time of 3.06 × 102 s? Please explain the steps, thank you. 
Question
Could someone please delete my previous question due to privacy issues? Posted by:Turner Date: Saturday, September 5,2015 at 9:00 pm Subject: AP Physics Thank you so much! 
Physics
what is the angular speed of the earth as it orbits the sun a) in radians/second? b) in degrees per day? I need help please. Use the equation and step by step to get the answer 
Physics
if the area of cross section of a wire in a circuit is doubled its resistivity? (a)becomes one fourth,(b) becomes half (c) remains the same (d) doubles. Exlpain please? 
physics
To calculate the young modulus uncertainty do you add together the percentage uncertainty of strain and stress and if not then what do u do. Please dont send websites just tell and help me out. 
physics
Help please? Having trouble with this. A race car makes two and half laps around a circular track in 3.0 min. What is the car's average angular speed? 
physics please help!!
Two balls have 3 nC of excess charge and are 10cm apart. What is the magnitude of the repulsive force on each? Electric field = 27,000 Charge = 3e8 Coulombs F = EQ = 8.1e4 ...which is wrong. 
physics
please i need help solving this problem, what is the resistance of a resistor if the potential difference across the resistor is 4.0 V when a current of 10.0 A flows through the resistor? 
Physics
Research on the physics of living systems.Give two examples to show how physics 
Physics
Hello can someone please help me with this physics question and show the work so I can understand? A box at the top of a rough incline possesses 981 joules more gravitational potential energy than it does at the bottom. As the box slides to the bottom of the incline, 245 ... 
Physics (please help)
A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true? a. None of the other statements are true. b. There is only one force acting on the planet. c. There are two forces acting on the planet and ... 
Science, please help!
Please check my answer! Fill in the blank for below: Resources that cannot be replaced in the environment once they are used are _____. renewable resources compost nonrenewable resources I think the answer is nonrenewable resources.I might be incorrect, so please check! This ... 
language art CHECK
Will somebody please check this for me and see if i used the words correctly please? Having spent many years as political opponents, the two senators have developed a(n)MUTUAL respect for each other. Please check if it is correct. thank you 
Of Mice and Men ASAP
Hi My summer reading list is due on monday and i'm running out of time to finish this book (it has 6 chapters) I don't have the book with me anymore sadly because it wasn't my book. I wanna know if you can tell me the conflict in each chapter please please please thank you :) 
Physics please check
Please tell me where i went wrong. During an allnight cram session, a student heats up a onehalf liter (0.50 103 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19°C, and the beaker is filled to the brim. A short time later when the student returns, ... 
PHYSICS PLEASE HELP !!!!!
An object with a mass of 3.7 kg slides in the positive x direction across a horizontal surface with a coefficient of kinetic friction of 0.24. During its slide a force of 364 Newtons acts on it in the positive x direction while a force of 44 Newtons acts on it in the negative ... 
physics
When a tuning fork is held over the open end of a very thin tube, as in the figure below, the smallest value of L that produces resonance is found to be 33.0 cm. (a) What is the wavelength of the sound? [Hint: Assume that the displacement antinode is at the open end of the ... 
Chemistry
Please please help me on this equation I'm stuck and your steps are confusing. Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion remains.) Cl ‾ Ca2+ I have Ag+=0 and NO3^3= 0.13 but I can't seem... 
spanish
is this translated right? In the morning I wake up at 8:30 a.m. The first thing I do is brush my teeth and comb my hair. Then I eat breakfast. By 9:00 a.m., I start my schooling (home). The first thing I work on is trigonometry. Then I do English, Trigonometry, American ... 
please
tell sme the answers to pig skin geogphy right now please right now please well i need them poisted 
maths
the sum of 3rd and 5th terms of an a.p is 38 and sum of 7th and 10th terms of an a.p is 83,find the a.p. please help all questions please help please. 
Mathscan someone explain something to me???
hey, can someone explain vectors to me? im soooooo lost, I don't understand them at ALL. please please please help me. :( 
Math, Please Help! I don't understand!
Please help me! I don't understand how to solve. Solve each equation for the given variable. 37. x/a  1 = y/b for x 39. V = 1/3 * pi * r^2 * h for h What do these equations mean? I am super confused. Please help. 
physics
the tub of a clothes washer goes into its spindry cycle starting from rest and reaches an angular speed of 6.50 rev/s in 7.85 seconds. at this point, the person doing the laundry opens the lid, and a safety switch turns off the washer. the tub then slows to a stop in 15.07 ... 
physics
determine the stopping distances for an auto0mobile with the initial speed of 90km/hand the human reaction time of 1.0s: (a) for an acceleration a= 40m/s^2; (b) for a = 8.0m/s^2 use one of newtons four equations to solve.... i don't get this at all...PLEASE HELP!! 
Physics
Understanding Newton's First and Second Laws, why do all objets near Earth accelerate at a constant rate "g"? I'm very confused, is it something about how inertia keeps the objects accelerating? Please help , thank you.