Physics!
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Physics
A 855 N crate rests on the floor. a) How much work is required to move it at constant speed 7.7 m along the floor against a friction force of 180 N? b) How much work is required to move it at constant speed 7.7 m vertically? I really NEED help I am very lost with physics!!!! 
Physics
Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s 
physics
As a contrast between the old and the modern and between the large and the small, consider the following: In old rural England 1 hide (110 acres) was the area of land needed to sustain one family with a single plough for one year. (An area of 1 acre is equal to 4047 m2.) Also... 
Physics
For a question in physics... I was told to draw a graph of vertical displacement, y, versus time, t, in 2sec increments from 0 to 1.8. What was given to me was: v_yo_= +10m/s v_xo_= +5m/s a_y_ = 10m/s^2 So I used the formula: y=vo+1/2at^2 I drew the graph, and got a parabala... 
Physics
To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.40 m apart If the left scale reads 278 N, and the right scale reads 116 N, calculate the student's mass. Calculate the distance from the student's head ... 
physics
To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.44 m apart. If the left scale reads 309 N, and the right scale reads 125 N, calculate the student's mass. Calculate the distance from the student's head... 
Physics
I am doing my physics homework and am stuck on this one problem. can anyone help me please? Two blocks are connected by a massless string and are held in position by another massless string along a frictionless incline (as shown in the figure). Let M1 = 58.0 kg, M2 = 65.0 kg, ... 
PHYSICS
can someone help me with physics lab homework please: load 300 g at 60 degree mass at 180 deg 150 g mass at 270 deg 260 g for step two resolution of 300g at 60 degree f load= fx'= fy'= percent error for each component for setup II? WOULD THE HYPOTHETICAL SITUATION DESCRIBED ... 
physics
Hello I'm having trouble with this physics question: You are examining the loss in intensity as light passes through a fibre optic cable. The input intensity is measured as 55.1 W/m2 and the output intensity as 28.7 W/m2. Calculate the attenuation of the signal in decibels (dB... 
Physics repost
A wave traveling in the +x direction has an amplitude of 0.45 m, a speed of 6.1 m/s, and a frequency of 16 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) For Further Reading Physics  ... 
Physics
two students working on physics assignment to find out how far window is from the roof of a building drop a ball over the edge of the roof the ball takes .1 seconds to travel from the top of the window to its bottom of a distance of 1 m assume the acceleration of gravity to be... 
Physics
Nothing in my physics book addresses this question. Can someone please help?? Two ice skaters, with masses of 69kg and 47kg , stand facing each other on a 19mwide frozen river. The skaters push off against each other, glide backward straight toward the river's edges, and ... 
Physics / Astronomy
Here is my question: Consider the bending of light by the gravitation of the Sun as described by Newtonian physics. Light of frequency f passes at a distance d from the center of the Sun, which has a mass M. Show that the bending angle of the light is proportional to M/d. I'm ... 
Physics drwls please check
Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a ... 
Science
What are the properties of plasma? I brought home the wrong school book and of course I forgot what the properties were. Thanks loads for the help. http://en.wikipedia.org/wiki/Plasma_(physics) Thanks a lot, it really helped. Next time Iwill pay attention to which book I grab. 
physics
A) A ball is thrown vertically upward with a speed of 27.6 m/s from a height of 1.9 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s2. Answer in units of s B) How long does the ball take to hit the ground after it reaches its highest... 
physics3
home / study / science / physics / physics questions and answers / Ed And Annie Are Ice Skating. Ed (55 Kg) And Annie (40kg) Both Wearing Skates Face Each Other ... Your question has been answered Let us know if you got a helpful answer. Rate this answer Question: Ed and Annie... 
Physics
1)When a car drives off a cliff, why does it rotate forward as it falls? (Consider the torque it experiences as it rolls off the cliff.) 2)The front wheels located far out in front of the racing vehicle help to keep the vehicle from nosing upward when it accelerates. What ... 
Physics
Posted by Adam on Thursday, August 13, 2009 at 11:08am. In the figure take q1 = 22uC and q2 = 20u. The force on q_1 points in the  x direction, What is the magnitude of the force on q_1? I don't know where to start, can someone help me? Responses Physics  bobpursley, ... 
Physics
In physics, work is defined as the product of the A) net force and the distance traveled B) net force parallel to the motion and direction traveled C) net force parallel to the motion and the time it is applied 
physics
A 750N physics student carries a 4.0 meter board, uniform in shape, and 190 newtons in weight to our swimming pool. The student then places the board on the deck and next to the pool in such a way so 1.5 meters of the board extends out over the edge of the pool. How far, in ... 
horizontal displacement physics
how do we find horizontal displacement in physics? 
Physics
You slide your friend with a mass of 65 kg out of the way as they are blocking the exit and keeping you from escaping from physics class where you have been tormented by problems for the last hour and a half. The coefficient of kinetic friction between the floor and your ... 
Physics, please help
Distruive interference? Unless you put C in the line between A and B, this the asnwer is at infinity. Now on the line between A and B, the distance from A to C has to be an odd multiple of halfwavelength greater than C to B. Now, the distance between the speakers is two ... 
physics repost bobpursley
The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what? Responses * physics  bobpursley, Monday, June 22... 
Physics Need quick help please
Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks Physics... 
physics  so important
In which of these cases is a youngster doing work in the school gymnasium? climbing up a rope lifting a set of weights from the floor to overhead PLEASE HELP ME? i NEED TO KNOW THiS FOR A TEST TOMORROW iN PHYSiCS & i CANT SEEM TO FiND THE ANSWER ANYWHERE & i HAVE SO MANY ... 
Physics
After school you have been working on your slingshotmanship. Interested in the physics of the slingshot, you take data that compares the force of the extended slingshot versus the displacement from equilibrium. You think this graph is very similar to that of a spring so you ... 
physics
i'm not very good at physics and i have an exam tomorrow!! for the first one do i use the formula F=Kx to make the answer 4500 ? and for the second i really have no idea what formula to use what is the value for k if a spring stretches 0.4m when submitted to a 1800N force? ... 
physics
A baseball bat hits a ball with an average force of 970N that acts for 0.0088s. a) what impulse was given to the ball/ b)What was the change of momentum of the ball? c)The ball was hit back in the same direction that it came from. If its speed before being hit was 32ms1, what... 
physics
An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 75.0 cm long and has a mass of 5.28 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Responses Physics  bobpursley, Saturday... 
physics
Your physics teacher assigned a thermometerbuilding project. He gave you a glass tube with an inside diameter of 1.15 mm and a receptacle at one end. He also gave you 8.97 cm^3 of mercury to pour into the tube, which filled the receptacle and some of the tube. You are to add ... 
Engineering
A physics major is working to pay his college tuition by performing in a traveling carnival. He rides a motorcycle inside a hollow transparent plastic sphere. After gaining sufficient speed, he travels in a vertical circle with a radius of 13.4 . The physics major has a mass ... 
physics
you push a physics book 1.50m along a horizontal tabletop with a horizontal push of 2.40 N while the opposing force of friction is 0.600 N. How much work does each of the follwing forces do on the book? A) you 2.40N push. B) the friction force. C) the normal force from the ... 
Science
the SI UNIT for mass is what kg kg is correct. Here is a good site for SI units. http://physics.nist.gov/cuu/Units/units.html 
Physics
Physics lab need help with sources of error. In our lab, we had to use carbon tape and a spark timer to find out the maximum velocity and maximum acceleration of a high school student. I'm having a hard time to find sources of errors. Any ideas or insights would be really ... 
Physics
Test Bank, Question 13 In a classroom demonstration, a 79.2kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the ... 
math
How much force is needed to accelerate a 50kg rider and her 250kg motorcycle at 5 m/s2? This is really a physics question. The equation that you use is Newton's second law, Force = Mass x Acceleration. In this case, the total mass being accelerated is 300 kg. Multiply that ... 
Physics
Physics Help!!!!! Maximum Kinetic Energy based on a graph? A 2.50kg ball is attached to an unknown spring and allowed to oscillate. The figure shows a graph of the ball’s position x as a function of time t.(Figure 1) Part A: What is the maximum kinetic energy of the ... 
Physics
You and your friends are doing physics experiments on a frozenpond that serves as a frictionless, horizontal surface. Sam,with mass 80.0 kg, is given a push and slides eastward. Abigail, with mass 50.0 kg, is sent sliding northward. Theycollide and after the collision, Sam is ... 
Physics!!!!
3. You push your physics book 1.50 m along a horizontal table top with a horizontal push of 2.40 N while the opposing force of friction is 0.600 N. How much work does each of the following forces do on the book: (a) your 2.40N push, (b) the friction force, (c) the normal ... 
physics
a car is pared on a cliff overlooking the ocean on an incline that makes an angle of 24 below the horizontal. the negligent driver leaves the car in a neutral and emergency brakes are defective. the car rolls down the incline with a constant acceleration of 4 m/s^2 for a ... 
Physics
Suppose you viewed a movie that was running backwards. You would see lots of odd things happen: streams would flow uphill, a diver would emerge upwards and go back to the diving board etc. If these backward moving events actually happened in nature, which principle or ... 
Physics/Algebra
Physics: For a 225watt bulb, the intensity I of light in lumens at a distance of x feet is I=225/x^2. a. What is the intensity of light 5 ft from the bulb? b. Suppose your distance from the bulb doubles. How does the intensity of the light change? Explain. 
math
http://www.saburchill.com/physics/chapters/0073.html I have to draw a bestfit straight line on a graph. How do I know that its really best fitted  in the right angle? 
Physics repost please check
Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Please tell me what I am doing wrong. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. ... 
physics
An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 75.0 cm long and has a mass of 5.28 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Responses Physics  bobpursley, Saturday... 
physics
is this the strutual formula for hydrogen cyanide H:C:::N and is this correct for cyanogen :N:::C:C:::N any advice woulds be appreciated This is more chemistry than physics. It is important to put the subject line carefully in order for the right people to look at the problem... 
PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with this. All I need is a formula, please. :)Thank you! Here it is: A skier with a mass of 60.0 kg pushes... 
Physics
Airplanes are noisy things. For example, if you stand really close to a runway, a military jet can produce a sound intensity of about 100 W/m^2 at a distance of 30 m from the plane (this is beyond painful noise). You live near a military airport and want to work on physics ... 
Physics
Airplanes are noisy things. For example, if you stand really close to a runway, a military jet can produce a sound intensity of about 100~W/m^2 at a distance of 30 m from the plane (this is beyond painful noise). You live near a military airport and want to work on physics ... 
PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #7: A 30 kg ball is launched at an angle of 15 degrees and is moving 20 m/s ... 
Physics
(1) 2 particles of equal mass are fixed at X=0 and another +ve point on the x axis. No other grav influences are in the system. (they can be ignored) I have to derive an expression for Vgrav at a general position x, on the x axis. I believe this is related to V=GM/r, but can'... 
Physics
Please help me solve this, most likely simple, problem. I am just starting to learn physics and am finding it very confusing. If you could include a key to explain any formulas used it would be very helpful thank you. I have calculated GPE to be 1500J but I am totally stuck, I... 
physics
For a class demonstration, your physics instructor pours 1.16 kg of steam at 100.0°C over 4.69 kg of ice at 0.0°C and allows the system to reach equilibrium. He is then going to measure the temperature of the system. While the system reaches equilibrium, you are given the ... 
Scince: Physics
A ball is dropped from a building and falls with an acceleration of magnitude 10m/s^2. The distance between floors in the building is constant. The ball takes 0.5s to fall from the 14th to the 13th floor and 0.3s to fall from the 13th floor to the 12th. What is the distance ... 
PHYSICS!!
A Mountain bar has a mass of 6.7×10−2 kg and a calorie rating of 270 cal. What speed would this candy bar have if its kinetic energy were equal to its metabolic energy? [Note: The nutritional calorie, 1 Cal , is equivalent to 1000 calories (1000 Cal ) as defined in ... 
Physics
Highheeled shoes can cause tremendous pressure to be applied to the floor. Suppose the radius of a heel is 6.00 103 m. At times during a normal walking motion, nearly the entire body weight acts perpendicular to the surface of such a heel. Find the pressure that is applied ... 
physics
4. The physics class is having a tug of war – the men against the women. For a long time the two teams are pulling with equal force and the knot in the centre of the rope isn’t going anywhere. But then one boy sneezes and stops pulling as hard for just a few seconds. Of ... 
physics
Airplanes are noisy things. For example, if you stand really close to a runway, a military jet can produce a sound intensity of about 100 W/m2 at a distance of 30 m from the plane (this is beyond painful noise). You live near a military airport and want to work on physics with... 
Math
A particular Chemistry book costs $6 less than a particular Physics book. Two such Chemistry books and three such Physics books cost a total of $123. Construct two simultaneous equations and solve them using the substitution method. Show your working. I just need help ... 
physics
A student throws a 9 gram of gum is thrown across the physics lab from a distance of 2.5 m. When the gum has a horizontal velocity of vo it connects with a mass on the end of 1.62 kg simple pendulum which is initially at rest. The pendulum has a length of L of 0.74 m. The gum ... 
physics
A 2 kg rock is released from rest at a height of 29 m. Ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights;20m 15m 9m * physics  bobpursley, Wednesday, November 17, 2010 at 9:32am... 
PHYSICS
Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. Sally moved her hand from the rest position... 
PHYSICS HELP!
A compact car has a mass of 1400kg. Assume that the car has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs. What is the spring constant of each spring if the empty car bounces up and down 1.9 times each ... 
Physics  same ? as marina but im smarter, lol
Marina is my bf and we both attend a educational program called proyecto science. In it, when we were to attend the physics course, we had this ?: T = 2ð² L/G in this equation, T represents time, L represents Length and G represents Gravity. We are supposed to use ... 
PHYSICS. HELP!
I've been stuck on this physics homework since I got home. I think the main issue I don't get is finding the components, and adding them to find the resultant force or velocity. Here's one problem. Three forces act on a point concurrently. Force a is 80N at 220 degrees, force ... 
math sets
out of 320 students at a university,190 taking math,235 taking chemistry and 120 taking physics.125 are taking both chemistry and math,95 taking both chemistry AND PHYSIC,55 TAKING BOTH MATH AND PHYSICS.HOW MANY ARE TAKING ALL THE THREE SUBJECTS 
Physics
In a novel from 1866 the author describes a spaceship that is blasted out of a cannon with a speed of about 11.000 m/s. The spaceship is approximately 274 m long but part of it is packed with gunpowder, so it accelerates over a distance of only 213 m. What was the acceleration... 
Physics/Math
A single force acts on a 5.0 kg particlelike object in such a way that the position of the object as a function of time is given by x = 3.0t  4.0t 2 + 1.0t 3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 2.0 s. For ... 
mathematics
A book seller purchased 117 books out of which 45 books of mathematics and 72 books of physics.Each book has same size .Mathematics and Physics books are to be packed in bundles and each bundle must contain same no. of books.Find the least number of bundles which can be made ... 
pHYSICS
A BALL IS THROWN STRIAGHT UPWARD AND RETURMS TO THE THROWER'S HAND AFTER 3 SECONDS IN THE AIR. A SECOND BALL IS THROWN AT AN ANGLE OF 30 DEGREES WITH THE HORIZONTAL. AT WHAT SPEED MUST THE 2ND BALL BE THROWN SO THAT IT REACHES THE SAME HIEGHT AS THE ONE THORWN VERTICALLY? I ... 
Physics
A thickness planer is a machine that uses a rotating blade to shave a thin layer of wood off the top of the surface. While operating, a piece of wood is inserted such that it causes the machine to struggle and slow down due to resistance of the lumber. Curiously, the 15 amp ... 
math111
in a science class,65 student study physics while 40 study chemistry.if there are 93 student in the class,how many student study both physics and chemistry? 
Re: Physics/Math
A can of sardines is made to move along an x axis from x1 = 0.2 m to x2 = 1.2 m by a force given by F = iF0exp(0.4x), with x in meters and F0 = 4.5 N. (Here exp is the exponential function.) How much work is done on the can by the force? For Further Reading * Physics/Math  ... 
physics
A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ... 
physics
A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ... 
PHYSICS
Nate the Skate was an avid physics student whose main nonphysics interest in life was highspeed skateboarding. In particular, Nate would often don a protective suit of BounceTex, which he invented, and after working up a high speed on his skateboard, would collide with some... 
Physics repost please check
Posted by Mary on Monday, November 5, 2007 at 8:21pm. Suppose that the electric field of an electromagnetic wave decreases in magnitude. Does the magnetic field increase, decrease, or remain the same? Account for your answer. For Further Reading Physics  bobpursley, Monday, ... 
Physics 11
A 140 kg stationary crate is pulled by a force of 390 N along a horizontal surface. a) The coefficient of static friction between crate and surface is s = 0.25. Is the applied force large enough to begin moving the crate? Use physics calculations to prove that it is. b) The... 
Physics
I was given this problem, and are having problems. I am taking AP Physics and I want to be able to understand the concept. Thank you for your help. A block of mass m = 3.65 kg is attached to a spring (k = 27.5 N/m) by a rope that hangs over a pulley of mass M = 7.30 kg and ... 
Physics Drwls
I was wanting help with my physics post and since no one replied I thought there wasn't a physics tutor on Jiskha, but came back on today cause I really need to get a hang of my physics stuff and luckily seen you Drwls. A bike rider approachea a hill with a speed of 8.5m/s. ... 
Physics
if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics  bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time= mass*g*distance/time mass= power*time/... 
physics
You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. Unfortunately the archer stands on an elevated platform of unknown height. ... 
Physics
if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics  bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time= mass*g*distance/time mass= power*time/... 
Physics repost please check
A glass bottle of soda is sealed with a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.80 x10^5pa. Assuming that the top and bottom surfaces of the cap each have an area of .0004M^2, obtain the magnitude of the force that the screw thread exerts ... 
physics
Find the minimum diameter of a 51.5mlong nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·10^8 N/m2 physics  bobpursley, Saturday, October 29, 2011 at 10:32am Hookes Law: elongation= force... 
physics
john and paul are trying to move a 100kg piano which is resulting on a flat, smooth floor. John pushing towards the North, while Paul is pushing towards the East. Both are exerting a 100N force. What is acceleration of the piano (magnitude and direction)? A=200/100=2m/s^2 ... 
PhysicsSomeone please recheck
Bob Pursley rechecked my question and it was correct if you scan down but he didn't direct me where to find direction of magnetic force on plane and do the pilots have to make corrections to make up for the difference? I'd appreciate any help with that, if possible Thank you ... 
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
Whats the physics behind this? 3 balls are placed at the top of an inclined beam. The beam, attached to a spinning platform, is spun manually. As the platform and beam slows down, the first ball rolls down the beam. The beam instantly speeds up, but slows back down due to ... 
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
1. A typical household circuit is capable of carrying 15.0 Amps of current at 120 V before the circuit breaker will trip. How many 1500W hair dryers can run off one such circuit? In the rush to get ready for lecture, a physics professor leaves the hair dryer described in the ... 
Physics to bobpursley or any1 else who knows this
A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 2.... 
College Physics
One last physics problem left: Peggy drives from City A to City B in 50 minutes. City A is 75.1km from City O in a direction of 25degrees west of south. City B is 23.9km from City O in a direction of 20degrees south of west. Using City O as your origin, find (a) the ... 
math
In a class of 50 student, 25 offer mathematics, 22 offer physcis, 30 offer chemistry and all the student take at least one of these subjects , 10 offer physics and mathematics, 8 offer chemistry and mathematics , 16 offer physics and chemistry. (a) draw a venn diagram to ... 
Physics
I'm trying to rank the maximum temperatures of water at 20 degrees Celsius after adding in heated copper cylinders. The first case is 1 cylinder at 22.5 degrees Celsius. Second is two cylinders at 25 degrees Celsius. Third is 3 cylinders at 25 degrees Celsius. Lastly, 1 ... 
physics
A physics student playing with an air hockey table (a frictionless surface) finds that if she gives the puck a velocity of 5.30 m/s along the length (2.80 m) of the table at one end, by the time it has reached the other end the puck has drifted 5.19 cm to the right but still ...