Newton's law Definition and 346 Threads

This is a 4 part ordinary differential equation problem. a.) You are a member of a CSI team that has discovered a dead body in a field. Upon discovery of the body you measure its temperature and find that it is 76.04058181\circF. 10 minutes later the temperature of the body is...

Homework Statement "A student whose weight is 500 Newtons stands on a scale in an elevator and records the scale reading as a function of time. The data is shown in the graph above. At time t=0, the elevator is at displacement x=0 with velocity v=0. Assume that the positive directions for...

When 2 cars crash into the other, the smaller one skids backwards more than the larger one. - third law? Grandmother is very tired after rolling the bread dough on her kitchen table.- second law? After a while, airport runways show evidence of dark lines as tires are worn down from...

Homework Statement a). Four particles, each of mass m , are situated at the vertices of a regular tetrahedron of side a. Find the Gravational force exerted on anyone of the particles by the other three b) Three uniform rigid spheres of mass M and radius a are placed on a horizontal table and...

Problem From Newton's Law of Cooling, we can use the differential equation dT/dt= -k(T-Ts) where Ts is the surrounding temperature, k is a positive constant, and T is the temperature. Let \tau be the time at which the initial temperature difference T0-Ts has been reduced by half. Find...

Homework Statement Four particles, each of mass m , are situated at the vertices of a regular tetrahedron of the side a. Find the gravitational force exerted on anyone of the particles by the other three. Homework Equations F=m*M*G/R^2 The Attempt at a Solution Since the mass...

Homework Statement why is it that you sometimes feel 'light' or 'heavy' while moving in a fast moving lift? A lift has a total maximum mass, including occupants of 1000kg. it is supported by steel ables. the maximum acceleration or deceleration of the lift in operation is 2.0ms^-2. How big is...

Homework Statement The Following text is taken from a roller coaster webpage: "You reach the top of the hill, and finally realize that being in the front seat wasn't the best idea. You find yourself hanging over the ledge for what seems eternity, and finally you feel the foce of the back...

Hi. Let's say I have a lift with a man in it. The lift is moving upwards, and the forces acting on the man if I am not wrong is R (Normal reaction force by floor on man) and weight (mg). Hence R-mg=ma. Correct me if I am wrong or anything. But my teacher says that (this is a marking point...

One day a girl jogging in the park, doesn't see a sign up ahead, hits it and falls to the ground. Which of Newton's 3 laws is involved in this story? I think that Newton's 1st and 3rd law are invovled, not sure about the 2nd.

Homework Statement A gun that is fired "recoils". Explain using one of Newton's laws. Homework Equations ?? The Attempt at a Solution Newton's second law?? F=M/A

Homework Statement Why do you lunge forward when your car suddenly stops? Why are you thrown backwards when your car suddenly accelerates? Explain using Newton's laws Homework Equations ? The Attempt at a Solution Because of your seat belt, you are attached to the car, causing...

Homework Statement Pluto is only planet that has not yet been visited by a spacecraft . Pluto has a mass of 1.27*10^22 kg and a radius of 1.14*10^6m. although Pluto is in an elliptical orbit about the sun, for simpicity we'll assume Pluto orbits the sun in a circular orbit of radius...

Homework Statement A small object of unknown temperature was placed in a large room that had the fixed temperature 30 degrees C. After 10 minutes, the object's temperature is -10 degrees C, and after an additional 10 minutes, the object's temperature was -5 degrees C. What was the initial...

[SOLVED] Newton's law of gravitational attraction help? Homework Statement M1 is a spherical mass (38.6 kg) at the origin. M2 is also a spherical mass (10.3 kg) and is located on the x-axis at x = 61.2 m. At what value of x would a third mass with a 15.0 kg mass experience no net...

Homework Statement Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.20m. Two of the spheres have a mass of 2.8 kg, each. The third sphere has an unknown mass, and is released from rest. Considering only the...

[SOLVED] Newton's Law Flat Curve Homework Statement You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.470 kg suspended from the ceiling of the bus by a string of length 1.88 m is found to hang at rest relative to the bus when the...

hello I'm having trouble with this question. Hanging Chandelier A chandelier with mass m is attached to the ceiling of a large concert hall by two cables. Because the ceiling is covered with intricate architectural decorations (not indicated in the figure, which uses a humbler depiction)...

Hi everyone, Could someone please help me on this problem? Homework Statement Newton's law of universal gravitation is represented by the following equation where F is the magnitude of the gravitational force exerted by one small object on another, M and m are the masses of the...

So I'm reading "Mathematical Physics" by Donald H. Menzel, and I don't buy the following derivation from section 2.12 The purpose of the derivation is derive the potential energy at a point Po which is a distance Ro from the center of a sphere of uniform density. First they...

Homework Statement At 1:00 PM, a thermometer reading 70 degrees F is taken outside where the temperature is -10 degrees F (ten below zero). At 1:02PM, the reading is 26 degrees. At 1:05PM the thermometer is taken back indoors, where the air is at 70 degrees F. What is the temperature reading...

Homework Statement http://mediocre.wordpress.com/2008/01/09/Newtons-law-of-restitution/ Shown in my blog, link provided. Homework Equations Newton's Law of Restitution, v2 - v1 = e (u1 - u2) The Attempt at a Solution I have done the question, actually...but I need confirmation. Can...

Here's a bit from the Conclusion section of the April 2006 Rovelli et al paper http://arxiv.org/abs/gr-qc/0604044 ==quote== 7 Conclusion We have computed a first and a second order term in the expansion in λ of the diagonal components of the graviton propagator, in a large distance regime...

1. A planet has a mass 1/2 that of Earth and a radius 2 times that of Earth. What is the acceleration due to gravity on the surface of the planet in terms of g? 2. a)F=G*m1*m2/r^{2} b)F=mg 3. I figured that I would let the two equations equal to each other so...

Homework Statement The gravitational force between two shperes is 2.50x10^-8. Their centers are 105 cm apart. The larger sphere has a mass of 8.20 kg. Find the mass of the smaller sphere. Homework Equations F=Gm[SIZE="1"]1m[SIZE="1"]2/d² The Attempt at a Solution...

please write down the three Newton's laws of motion in both translation and angular forms, including their "equivalent" expressions of Newton's second law. what are the assumptions for their application in classic mechanics? are those "equivalent" forms really equivalent? why? this is from my...

Homework Statement A mass M is split into two parts, m and M - m, which are then separated by a certain distance. What ratio m/M maximizes the magnitude of the gravitational force between the parts? Homework Equations F=Gm1m2/d^2 The Attempt at a Solution I first just tried plugging...

at 1 pm, a thermometer reading 70 F is taken outside where the air temperature is -10F (ten below zero). at 1:02 p.m., the reading is 26F. At 1:05 p., the thermometer is taken back indoors , where the air is at 70 F. What is the temperature reading at 1:09 pm? Ive made a table like this...

Homework Statement A student proposes to measure the gravitational constant G by suspending two spherical objects from the ceiling of a tall cathedral and measuring the deflection of the cables from the vertical. If two 155.0 kg objects are suspended at the lower ends of cables 40.00 m long...

Homework Statement A bureau rests on a rough horizontal surface ( mk=0.40, ms=0.50). A constant horizontal force, just sufficient to start the bureau in motion, is then applied.The acceleration of the bureau is: Homework Equations F= ma The Attempt at a Solution The answer is...

I'm taking my first Physics course (it's a foreign language), and in English class we were given a piece of paper on Skating taken from an English Physics textbook. We are having problems with some expressions, such as Inertia. What the heck is inertia? Is it a law? Or an expression? (I checked...

Homework Statement A smaller bowl of porridge served at 200 degres F cools to 160 degres in 1 min. What tempature (too cold) will this porridge be when the bowl of exercise 27 has reached 120 degres F (just right)? Homework Equations y(prime)(t)=k((y(t)-T sub a ) y(t)=Ae^(kt)+T sub a...

A race car travels 44m/s around a banked (45degree with the horizontal) circular (radius = 200m) track. What is the magnitude of the resultant force in N on the 80 kg driver of this car. I've having a hard time setting up the free body diagram. First I broke into Fx and Fy Fx: F...

"Consider the Earth following its nearly circular orbit about the sun. The Earth has a mass mearth=5.98x10^24kg and the sun has mass msu=1.99x10^30kg. They are separated, center to center, by r=93 million miles = 150 million km." What is the size of the gravitational force acting on the Earth...

Homework Statement Three objects are connected by light strings as shown in Figure P4.62. The string connecting the m1 = 5.00 kg mass and the m2 = 4.00 kg mass passes over a light frictionless pulley. a) find the acceleration of each object and b) the tension in the two strings...

Homework Statement The mass of the moon is 7.35 x 10^22 kg and its distance from the Earth is 3.84 x 10^5 km. Taking Earth's mass to be 5.98 x 10^24, calculate what Newton called "the force resquisite to keep the moon in her orb." mass of moon = 7.35 x 10^22 kg distance from earth= 3.84...

Homework Statement Derive Newton's Law of gravitation using kepler's laws. Homework Equations Kepler's law equations. etc. The Attempt at a Solution l= r(1- e*cos(theta)) l- const. e- eccentricity Solving these equations using kepler's laws (r^2(d(theta)/dt), etc.)...

Homework Statement The time it takes for a deceased human body to reach room temperature. Room temperature = 25 degrees C Initial temperature of corpse = 37 degrees C Homework Equations I used Newton's law of cooling: \frac{dT}{dt} = -k(T - T_{room}) where T is a function of t(time in...

Homework Statement A man pushing a piano with a mass 160kg at constant velocity up a ramp that is inclined at 36.9 degrees above the horizontal. Neglect friction. If the force applied by the man is parallel to the incline, calculate the magnitude of this force. Homework Equations The...

Homework Statement The two blocks are connected by a heavy uniform rope with a mass of 4.00kg. An upward force of 200N is applied as shown. a.) What is the acceleration of the system? b.) What is the tension at the top of the heavy rope? c.) What is the tension at the midpoint of the rope...

hi i have some questions about Newtons law of gravitation and i need complete answers coz these qwestion will be my second exam: 1.the gravitational force between a ring of raduis a and mass m and a rod of mass m and length l lies on the central axis of the ring and the distance is x between...

I'm confused about the two equations: PE_{G}=G\frac{m1*m2}{r} PE_{G}=mgh When do you use either of these equations? Can these two equations be used interchangeably or not? Also, I think I remember reading somewhere that you need to use the 1st equation when the problem involves large...

Hey, I'm having problems with this question: According to Newton's law of cooling, what cools faster, a person from 150 degress celcius to 100 degrees celcius or 100 degrees celcius to 50 degrees celcius in a laboratory environment? Why? I' not really sure where to start. I know the...

Homework Statement Bob loves vegetarian pizza. How long will it take Bob's pizza to cool to 110 degrees if he bakes it at 450 degrees for 20 minutes? The temperature in his house is a balmy 70 degrees. Homework Equations T(t) = Ts + Do*e^(-k*t) where... Do = initial temperature...

http://arxiv.org/abs/gr-qc/0702009 Why do we Still Believe in Newton's Law ? Facts, Myths and Methods in Gravitational Physics Authors: Alexander Unzicker Comments: 29 pages LaTeX, 2 figures An overview of the experimental and observational status in gravitational physics is given, both...

Homework Statement Assume no friction. Suppose I exert a force of 1N to a block. The block will exert 1N of force back at me. If I keep exerting the 1N than there is a constant force of 1N exerted back at me so my hand is in constant velocity? But the block I am exerting the force is...

Due to a jaw injury, a patient must wear a strap (see the figure) that produces a net upward force of 5.00 N on his chin. The tension is the same throughout the strap. To what tension must the strap be adjusted to provide the necessary upward force? Here's the picture: I think the...

1. Why is inertia called an inherent property? 2. According to third law of motion, specify the action and reaction while hammering a nail. Action is hammering but what's the reaction?

Homework Statement An advertisement claims that a particular automobile can "stop on a dime." What net force would actually be necessary to stop an automobile of mass m traveling initially at a speed of v in a distance equal to the diameter of a dime, which is d? Homework Equations F=ma...

What does it mean by momentum transfer is not a vector (3 components) but rather a tensor (9 components)?