Applying newtons laws Definition and 13 Threads

I was able to solve this problem easily by using the fact that the center of mass of the system is stationary as ##\sum F_{ext} = 0## for the ball and shell system. since COM's of both objects can be replaced with point masses at there center, the shell will have maximum displacement when its...

Homework Statement [/B] A child sits on a sled (50kg) on a snowy hill with an incline of 5 degrees. The coefficient of static friction is 0.05. What downward force must a parent apply parallel to the normal force, to prevent the child from sliding down the hill? (Answer: 366N)Homework Equations...

Homework Statement A rod extends from a vertical wall at an angle of 27º from the horizontal. A 2.5-kg lamp is mounted at the end of the rod. After John throws his 300-g winter coat over the lamp, what is the magnitude of the tension in the rod? The answers choices are: A) 30N B) 70N C) 27N D)...

Hi :) Here is a true story... I was in my car which weighs 820 Kgs, I for arguments sake weighs 80Kgs and the vehicle has an acceleration of 0-100 Kph in 15sec I was at a stop and went to go around a stationary vehicle in front of me.. I locked the wheel and attempted the pass but instead made...

I am having a very hard time understanding these two problems I have attached. I have read the chapter in our text over and over again, but do not see the correlation or how to exactly set the problems up. I recently had surgery on my writing hand and missed a large portion of this class, so I...

Homework Statement A 2.0 kg mass , placed on a smooth, level table, is attached by a light string passing over a frictionless pulley to a 5.0 kg mass hanging freely over the edge of a table. Calculate... a) the tension in the string b) the acceleration of the 2.0 kg mass on the table.The answer...

A 20000 rocket has a rocket motor that generates 3.0×105 of thrust. What is the rocket's initial upward acceleration? Express your answer using two significant figures. At an altitude of 5.0 km the rocket's acceleration has increased to 6.0 m/s^2 . What mass of fuel has it burned...

Homework Statement In the figure, a crate of mass m = 96 kg is pushed at a constant speed up a frictionless ramp (θ = 27°) by a horizontal force F. The positive direction of an x-axis is up the ramp, and the positive direction of a y-axis is perpendicular to the ramp. (a) What is the magnitude...

applying Newtons laws on an inclined surface with two masses Homework Statement Two blocks connected by a cord passing over a small, frictionless pulley rest on frictionless planes (diagram attached) a) which way will the system move when the blocks are released from rest? b) what is the...

Homework Statement A 26.21 kg loudspeaker is suspended 1.15 m below the ceiling by two 3.91-m-long cables that angle outward at equal angles. What is the tension in the cables? Homework Equations I have no idea The Attempt at a Solution well i know that i have the weight which is...

http://img.photobucket.com/albums/v638/ravenatic20/cablecars.jpg Like my MS Paint skills? haha The image shows a section of an alpine cable-car system. The maximum permissible mass of each car with occupants is 2800 kg. The cars, riding on a support cable, are pulled by a second cable...

Luggage is transported from one location to another in an airport by a conveyor belt. At a certain location, the belt moves down an incline that makes an angle of 2.5 degrees with the horizontal. Assume that with such a slight angle there is no slipping of the luggage. Determine the magnitude...

Ok the question is Mass m1 is on an inclined surface at angle @ and is connected to a second hanging block with mass m2 by a cord passing over a small, frictionless pulley. the oeficient of static friction is u and the coefficient of kinetic friction is uk. I first had to find m2 when m1 is...