Mastering physics Definition and 87 Threads

This is another problem from the same homework set that I was working on earlier. Again I believe conservation of momentum is the key formula. Homework Statement An 8000kg freight car rests against a spring bumper at the end of a railroad track. The spring has constant k=3.2*10^5. The car is...

Homework Statement A 238U nucleus is moving in the x direction at 4.5*10^5 m/s when it decays into an alpha particle 4He and a 234Th nucleus. 1.) If the alpha particle moves off at 34degrees above the x-axis with a speed of 2.0*10^7 m/s, what is the speed of the thorium nucleus? 2.)What...

Homework Statement Three satellites orbit a planet of radius R, as shown in the figure. Satellites S_1 and S_3 have mass m. Satellite S_2 has mass 2 m. Satellite S_1 orbits in 250 minutes and the force on S_1 is 10,000 N. See attached figure (knight_Figure_12_26.jpg). a. What is the...

I really don't know how to find the acceleration at the intersection. You are driving to the grocery store at 19 m/s. You are 140 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.77 s and that your car brakes with constant acceleration. I have found...

It's by far the best way to give out homework relevant to lectures i give it a 10/10 how many people have used masteringphysics?

An 85.0 baseball player who has leapt vertically into the air to catch a line drive catches the ball as it is headed horizontally directly into his glove. The ball has a mass of 145 and is headed perpendicular to his arm at 52.0 just before he catches it. Just after he catches the ball...

Homework Statement A box of textbooks of mass 24.5 rests on a loading ramp that makes an angle with the horizontal. The coefficient of kinetic friction is 0.260 and the coefficient of static friction is 0.360. As the angle is increased, find the minimum angle at which the box starts to...

Homework Statement A child slides down a frictionless 3.1 -long playground slide tilted upward at an angle of 37. At the end of the slide, there is an additional section that curves so that the child is launched off the end of the slide horizontally. Part A How fast is the child moving at...

Homework Statement I am having a problem with a mastering physics problem. I am given this image I am to Express C in terms of vector A, vector B, and angle theta, using radian measure for known angles. I know theta is equal to pi - c. Homework Equations law of cosines The...

Homework Statement A 3000 cm3 container holds 0.10 mol of helium gas at 300C. How much work must be done to compress the gas to 1000 cm3 at constant pressure? How much work must be done to compress the gas to 1000 cm3 at constant temperature? The attempt at a solution W = integration...

Homework Statement A research submarine has a 40.0 cm-diameter window 8.50 cm thick. The manufacturer says the window can withstand forces up to 1.20×10^6 N. What is the submarine's maximum safe depth? The Attempt at a Solution The area which force will be exerted on is A= Pai * r^2 =...

Homework Statement "In a lab experiment you let a uniform ball roll down a curved track. The ball starts from rest and rolls without slipping. While on the track, the ball descends a vertical distance h. The lower end of the track is horizontal and extends over the edge of the lab table; the...

Physics work problem -- mastering physics Homework Statement Find the work W done by the 15-Newton force. Homework Equations W=\vec F\cdot\vec s=\left|\vec F\right|\left|\vec s\right|\cos \theta The Attempt at a Solution W= 15*cos140*160 = -1838.506 I don't know why mastering physics was...

1. Calculate the orbital period for Jupiter's moon Io, which orbits from the center of the planet. 2. A white dwarf is a collapsed star with roughly the mass of the Sun compressed into the size of the Earth. What would be (a) the orbital speed and (b) the orbital period for a spaceship...

Homework Statement Let us now consider several questions that include numeric data. A sled is being pulled along a horizontal surface by a horizontal force F of magnitude 600 N. Starting from rest, the sled speeds up with acceleration 0.08 m/s2 for 1 minute. Find the instantaneous...

Question about how to study physics; general question all input is allowed:)THANKS Ok so I am a EEN major and while I know there are others with a lot harder course load I am taking...Vector Cal(252). university physics 2(242). arabic 2(112), and busniess course(business magt. is my...

Homework Statement http://img255.imageshack.us/img255/8533/physzl2.th.jpg http://g.imageshack.us/thpix.php Homework Equations Look below. The Attempt at a Solution What I basically did was Acceleration of x = (0.54 m/s^2)cos(36)=0.44m/s^2 Acceleration of y = (0.54 m/s^2)sin(36)=0.32m/s Then I...

The minute hand on a watch is 2.0 cm in length. What is the displacement vector of the tip of the minute hand From 8:00 to 8:20 a.m.? From 8:00 to 9:00 a.m.?

A sprinter can accelerate with constant acceleration for 3.70 before reaching top speed. He can run the 100-meter dash in 10 s. What is his speed as he crosses the finish line?

[SOLVED] Open ended pipe Harmonics Mastering Physics Question Homework Statement Consider a pipe 45.0cm long if the pipe is open at both ends. Use v = 344m/s. Now pipe is closed at one end. What is the number of the highest harmonic that may be heard by a person who can hear frequencies...

Homework Statement A 1500 kg weather rocket accelerates upward at 10m/s^2. It explodes 2.0 s after liftoff and breaks into two fragments, one twice as massive as the other. Photos reveal that the lighter fragment traveled straight up and reached a maximum height of 530 m. That is the problem...

[SOLVED] mastering physics answers wrong just wanted to know if anyone else is using the program mastering physics for homework and getting wrong answers to the questions. This has happened to me a few times and I am sure their answers are completely wrong. For example a simple work problem...

Homework Statement You are conducting an experiment inside an elevator that can move in a vertical shaft. A load is hung vertically from the ceiling on a string. The tension in the string is measured to be 10% less than the weight of the load. No other forces are acting on the load. Which of...

Information given: Two bicycle tires are set rolling with the same initial speed of 3.60 m/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 {\rm psi} and goes a distance of 18.1 m; the other...

Any chance that anyone else has dealth with the online homework system Mastering Physics? My current General Physics 1 course uses this system because of several studies the company showed the Physics Department heads about how this form of online homework and a "conceptual learning" approach...

An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1950 Nm to the propeller, which starts from rest. How much work in joules is being done after 5 revolutions? This is what I...

The motor of a table saw is rotating at 3450 rev/min. A pulley attached to the motor shaft drives a second pulley of half the diameter by means of a V-belt. A circular saw blade of diameter 0.208 m is mounted on the same rotating shaft as the second pulley. PART A: The operator is careless and...

uniform linear charges and plane charges and mastering physics?? I am completely stumped on this mastering physics problem, problem 22.34 (same as out of the university physics volume 3 11th edition book) and I cannot find any examples to compare to in my physics book and I have tried multiple...

I've been messing around with this problem for a while now and am getting absolutely nowhere. I was wondering if anyone could help me work it out... --A movie stuntman (mass 80.0 kg) stands on a window ledge 5.0 m above the floor. Grabbing a rope attached to a chandelier, he swings down to...

If anyone uses the Knight book, and has done the chapter 10 work on trading momenta in a collision, help would be appreciated.

Can anyone help me with theses problems? 1. A 500 g cart is released from rest 1.0 m from the bottom of a frictionless, 30 ramp. The cart rolls down the ramp and bounces off a rubber block at the bottom. The figure shows the force during the collision. After the cart bounces, how far does...

Not sure of the number, but it is about a weather rocket that explodes. A 1500 kg weather rocket accelerates upward at 10\;{\rm m}/{\rm s}^{2} . It explodes 2.0 s after liftoff and breaks into two fragments, one twice as massive as the other. Photos reveal that the lighter fragment traveled...

Ok here is the problem A hollow spherical shell with mass 2.50kg rolls without slipping down a slope that makes an angle of 30.0 degrees with the horizontal. > Find the acceleration a_cm of the center of mass of the spherical shell. > Take the free-fall acceleration to be g=9.80m/s^2. > I...

First off let me say I am completely stumped. I don't remember teacher teaching this, and its definitely not in book(I went through it 3 or 4 times) and its not even the same book mastering physics uses... The Question is : What is the final angle that the ball's velocity vector makes with...

Two wires are tied to the 2.0 kg sphere shown in the figure View Figure . The sphere revolves in a horizontal circle at constant speed. For what speed is the tension the same in both wires? What is the tension? I reallllly need some hints to figure the first part, and the second...

can anyone help me with this problem A shaft is drilled from the surface to the center of the earth. Make the rather unrealistic assumption that the density of the Earth is uniform. With this approximation, the gravitational force on an object with mass m, that is inside the Earth at a...