Laws Definition and 1000 Threads

Homework Statement A baseball player hits the ball straight up in the air with a velocity of 18.0m/s. As soon as the ball is hit, the runner on third base dashes toward the home plate. The distance between third base and home plate is 27.4m. Where will the runner be with reference to home...

Homework Statement A 65kg swimmer jumps of a 10m tower. a) Find the swimmer's velocity when hitting the water b) The swimmer comes to a stop 2.0m below the surface. Find the net force exerted by the water. Homework Equations F=ma? I don't know the rest, which is part of the problem...

A 6.0L flask contains a mixture of methane, argon, and helium at 45C and 1.75atm. If the mole fractions of helium and Argon are 0.25 and 0.35, respectively, how many molecules of methane are present? V = 6.0L T=318.15K Ptotal=1.75atm mole fraction: XHe=0.25 XAr=0.35 XCH4=0.40...

Homework Statement Calculate limit Using Limit Laws Homework Equations Lim x+2/X^3+8 as X-->(-2) The Attempt at a Solution Ok so, I'm a little stumped as to what trick I need to pull out of the bag for this one. Obviously the function goes to 0/0, but I can't seem to factor...

Homework Statement A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.18 and the push imparts an initial speed of 4.1 m/s? Homework Equations MG of the object = mass * 9.8 Friction = mg * 0.18 The...

Homework Statement A block of mass m lies on a wedge of mass M as shown in figure. Answer the following parts separately. (a) - With what minimum acceleration must the wedge be moved towards right horizontally so that the block m falls freely? (b) - Find the minimum friction co-efficient...

¿what is the domain of validity of inverse square laws of Newton and coulomb? I think (correct me if this is false) that at the small scale these laws have been verified accurately , but ¿what happens with large distances? :rolleyes: . ¿Have been done an experiment which measured the...

The particle of mass 'm' is moving with the laws ... Homework Statement The particle of mass 'm' is moving with the laws ... Homework Equations a. x=3t2+4 b. x=106t-t2 c.x=1000t-5t2 d.x=t2-20t e.x=50t-2t2 in what case the value of the force acting on the particle is the...

How does (ln(x))^(1/x)=ln(x^(1/x))? A friend told me this was a true statement but could'nt prove it. If that isn't true, then how would you find the lim x->0 of (ln(x))^(1/x) using L'Hospital's Rule?

Homework Statement Three crates are arranged. Their masses are m1=29.8, m2= 15.3, m3= 27.3. The applied force of 910 N is directed horizontally and the coefficient of friction is u= .277 WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M1 and M2? WHAT IS THE MAGNITUDE OF THE CONTACT...

We keep searching for the Physical Laws but is anyone looking for the Laws that brought them about? Is it not inconsistent to expect Physical Laws to have no cause? Foundations of The Quantum Logic

Homework Statement Three crates are arranged. The masses of the crates are m1= 29.8kg, m2= 15.3kg, and m3=27.3kg. The applied force of 910 N is directed horizontally, and the coefficient of friction is u= .277. what is the acceleration of the three masses and the magnitude of the...

Homework Statement How much tension must a rope withstand if it is used to accelerate a 1000 kg car vertically upward at 0.80 m/s2? Ignore Friction. Homework Equations fay= ma ? mg-fn=0 The Attempt at a Solution F=MA F=1000kg * .8 F= 800 WRONG!

Homework Statement A 1380kg car is moving due east with an initial speed of 27 m/s . after 8.00s the car has slowed down to 17.0 m/s . Find the magnitude and direction of the net force that produces the deceleration Homework Equations Net force of x= MAx Net force of y= MAy The...

Homework Statement A orbiting satellite stays over a certain spot on the equator of (rotating) Mercury. What is the altitude of the orbit (called a "synchronous orbit")? Mercury mass = 3.3022 e23 kg Mercury Radius = 2439.7 km Homework Equations T^2 = (4\Pi^2/GM) * r^3 and that's...

I'm having a lot of trouble trying to figure out some of these problems. If people could help me, it'd be greatly appreciated! 1. A 50.0-kg person takes a nap in a backyard hammock. Both ropes supporting the hammock are at an angle of 15.0° above the horizontal. Find the tension of the ropes...

Homework Statement Some people believe that the Moon controls their activities. The Moon moves from being directly on the opposite side of Earth from you to be being directly overhead. Assume that the Earth-Moon (center-to-center) distance is 3.82 multiplied by 108 m and Earth's radius is 6.37...

Ok, firstly I just want to say I have a layman's interest in physics. But from my limited understanding physicists use the theory of general relativity to understand big things like stars and galaxies and use quantum mechanics to understand the very small things like atoms and sub-atomic...

Consider the following cyclic process: Each cycle 800J of Energy is transferred from a reservoir at 800K and 600J of energy from a reservoir at 600K. 400J of heat is rejected to a reservoir at 400K and 1000J of work is done. I think that the process doesn't violate the first or second laws...

A 500N force acts in a northwesterly direction . A second 500N force must be exerted in what direction so that the resultant of the two vectors points westward? i think the answer is southwesterly direction but I am not sure. :confused:please help.

Homework Statement A 0.54kg ball falls from rest at a height of 26m and rebounds up 16m. If the contact between the ball and ground lasted 1.8ms, what average force was exerted on the ball? Homework Equations F=ma v²=v0²+2a(x-x0) v=v0+at 1000ms=1s (1.8ms is 0.0018s) The Attempt at...

The pine tree air freshener hanging from the rear view mirror makes an angle of 27.9 degrees with the vertical while a car is acceleration a)What is the car's acceleration ax=gsin(theta)=9.80*sin(27.9)=4.59 b)What is the tension in the string of the 100g air freshener? ax=T/m=4.59(100)=T...

Homework Statement A train is traveling up a 3.73 degrees incline at a speed of 3.25 m/s when the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did the last car travel before momentarily coming to...

Some laws of nature are not fundamental. These laws are explained why more fundamental laws. These more fundamental laws would be explained by more fundamental, deeper laws. Assumpting that this process do not continue indefinitly. We will eventually arrived at a set of fundamental laws, S. Why...

Homework Statement "Blocks A, B, and C are placed as in the figure and connected by ropes of neligible mass. Both A and B weigh 25.0 N each, and the coefficient of kinetic friction between each block and the surface is 0.35. Block C descends with constant velocity. a) Draw separate free body...

Homework Statement What is the acceleration of a 35 kg block of cement when pulled sideways with a net force of 150 N? Homework Equations what i did was f=ma a=m/f and just plugged the numbers in The Attempt at a Solution i got 4.2 but when i entered it into the assignment it...

Homework Statement To model a spacecraft , a toy rocket engine is securely fastened to a 2.00-kg large puck, which can glide with negligible friction over a horizontal surface, taken as the xy plane. The engine exerts a time-dependent force, F = (8.00 î – 4.00t ĵ) N, where t is in seconds...

Projected Up an Incline A block is projected up a frictionless inclined plane with initial speed v1 = 3.43 m/s. The angle of incline is θ = 32.5°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom...

Homework Statement There is a table with two masses hanging from the sides, each weighing 100N, on the table there is a scale, what would this scale read? A) 100N B) 200N C) 0N Homework Equations Fnet = Mass1 -Mass2 The Attempt at a Solution Since one tension in one string...

1) If air contains 1% AR by volume, what is the mass of Argon in a 2L balloon of air at 25 degress celsius? 2) If for a real gas, P = RT(V - b) - a/V^2 where a and b and R are constants, P = pressure, T = temperature and V = volume. What does a large a value represent in a real gas? 3)A...

Homework Statement Two astronauts are unloading scientific equipment from the spaceship that has just landed on the Moon surface. To prevent a box from sliding down an inclined ramp, astronaut A pushes on the box in the direction parallel to the incline, just hard enough to hold the box...

Homework Statement An 81 kg man lowers himself to the ground from a height of 10.6 m by holding onto a rope that runs over a frictionless pulley to a 60 kg sandbag. (a) With what speed does the man hit the ground if he started from rest? (b) What can he do to make him hit the ground slower...

First post =] Requesting guidance with this particular problem: Homework Statement A 1.20 kg object is moving in the x direction at 14.4 m/s. Just 3.31 s later, it is moving at 28.8 m/s at 34.0 degrees to the x axis. a.) What is the magnitude of the force applied during this time...

Homework Statement A worker pulls horizontally on a rope that is attached to a 10 kg crate that is resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3 respectively. The worker pulls with a force of 45N. What is the frictional force exerted by the...

A fisherman is fishing from a bridge and is using a "32.0-N test line." In other words, the line will sustain a maximum force of 32.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in with an acceleration whose magnitude is...

A toboggan slides down a hill and has a constant velocity. The angle of the hill is 8.80 with respect to the horizontal. What is the coefficient of kinetic frction between the surcae of the hill and the toboggan? So i used the formula: sum of forces(x)= cos (8.80)=0.98823 Forces (y)=...

Homework Statement A bug flies into the windshield of a big rig that is traveling on the freeway. What type of collision is this? Is momentum conserved? Is energy conserved? What force does the bug exert on the windshield (make a statement about Newton’s 3rd Law)? Homework Equations...

Homework Statement A curve of radius 16 m is banked so that a 940 kg car traveling at 44.4 km/h can round it even if the road is so icy that the coefficient of static friction is approximately zero. You are commissioned to tell the local police the range of speeds at which a car can travel...

Homework Statement a box of Cheerios (mass mC = 1.1 kg) and a box of Wheaties (mass mw = 3.6 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 1.6 N, and the magnitude of the...

Is conservation laws are more fundamental than Newton's second law in Newtonian mechanics? I know from the point of view of Noether's theorem conservation laws are more fundamental. But all the conservation laws can be derived from the F= ma equation. And from these conservation laws I can't...

Homework Statement There is a drawing with a block weight 416N on a table attached to a string that is running through a pulley at the end of the table. On the other end of the string a block that is hanging off the side of the table with a weight of 215N. Ignore all frictional effects and...

Homework Statement A tree house has a vertical "fire pole" of smooth metal, designed for quick exits. A child of mass 35.7 kg slides down the pole with constant acceleration, starting from rest. The pole is 3.10m high. The journey to the ground takes 2.00s. a) what is the magnitude of the...

Homework Statement Homework Equations Kirchoff's Rules The Attempt at a Solution hey there! i'm having trouble with parts of the question above; for the first two a: dimmer, b: normal. however for c & d I'm confused, I did ask my teacher however he wasn't helpful at...

Homework Statement A 1500-kg car is dragged up a 20 degree rough ramp by a tow truck. The coefficient of static and kinetic friction between the car and the ramp are 0.8 and 0.5 respectively. Assume that wheels are locked. *Note: picture of a sedan pulled up a ramp with a rope. Find the...

Newton's Laws -- friction, tension, acceleration A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of Fp = 24 N. The coefficient of friction of the blocks with the floor is μ = 0.27. a) What is the acceleration of...

I am wondering why both Coulomb and Classical Gravity follow 1/r^2 laws. Weak and Nuclear force fall off at much faster distance scales! Does anyone know why it is that both Coulomb and Gravity have 1/r^2 strength, while the other forces have different distance scales?

1. In the drawing, the weight of the block on the table is 388 N and that of the hanging block is 175 N. Ignore all frictional effects, and assuming the pulley and the cord to be massless. Find the acceleration of the two blocks as well as the tension in the cord 2. Fnet = mass of the...

Homework Statement At the airport, you pull a 18-kg suitcase across the floor with a strap that is at an angle of 45 deg above the horizontal. Find a) Normal force and b) the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic...

Homework Statement Paleontologists estimate that if a Tyrannosaurus rex were to trip and fall, it would have experienced a net force of approximately 256,700 N acting on its torso when it hit the ground. Assume the torso has a mass of 3710 kg. (a) Find the magnitude of the torso's upward...

Homework Statement In figure 6-36, two blocks are connected over a pulley. The mass of block A is mA and the coeffcient of kinetic friction between A and the incline is Uk. Angle of the incline is theta. Block A slides down the incline at constant speed. What is the mass of block B? Express...