PSS 13.1: Let's Go For a Spin

Please do not place your response in a .pdf or .cdx format, but Word documents are okay. Thanks! Here's the actual problem: A uniform board of mass m and length L is pivoted on one end and is supported in the horizontal position by a rope attached to the other end. Another rope, attached to the board a distance L/3 from th ...continues

PSS 13.2: Walking the Plank

Please do not place your response in a .pdf or .cdx format, but Word documents are okay. Thanks! Here's the actual problem: A horizontal uniform bar of mass m and length L is hung horizontally on two vertical strings. String 1 is attached to the end of the bar and string 2 is attached a distance L/4 from the other end. A m ...continues

Sliding Dresser

Sam is trying to move a dresser of mass m and dimensions of length L and height H by pushing it with a horizontal force F applied at a height h above the floor. The coefficient of kinetic friction between the dresser and the floor is μk and g is the magnitude of the acceleration due to gravity. The ground exerts upward norm ...continues

Harmonic Oscillator Kinematics

One end of a spring with spring constant k is attached to the wall. The other end is attached to a block of mass m. The block rests on a frictionless horizontal surface. The equilibrium position of the left side of the block is defined to be x=C. The length of the relaxed spring is L. The block is slowly pulled from its equi ...continues

The Ideal Gas Derived

A. Find the magnitude of the average force in the x direction that the particle exerts on the right-hand wall of the container as it bounces back and forth. Assume that collisions between the wall and particle are elastic and that the position of the container is fixed. Be careful of the sign of your answer. Please see attac ...continues

Height of stadium roof

Write the simplest model for how high the roof of a baseball stadium would have to be, neglecting air resistance and other inconvenient aspect of base ball. (Question is also included in attachment)

Optics - Urgent

Given a hemisphere of radius r defined by: x = r*cos(a) y = r*sin(a) where -pi/2 <= a <= pi/2 If the hemisphere describes a boundary between two interfaces having indices of refraction n (outside the hemisphere) and m (inside the hemisphere) and assuming the light strikes the hemisphere at point {x,y} with angle a (meanin ...continues

Vector Problem

A 100N sign is supported by two cables that are attached to two cables that are attached to two buildings. The cables make an angle of 30 degrees with the top of building A and 60 degrees with the top of building B. Find the magnitude of the force exerted by each cable on the sign.

Special Theory of Relativity

A.1 Inertial observer O´ moves at speed v in the negative z-direction with respect to inertial observer O. Write down the relationship between the sets of coordinates used by the two different observers. A.2 A rocket moves at speed 4c/5 towards the earth. It fires a missi ...continues

Special relativity - past exam paper

i would be grateful if anyone could provide me with solutions to QA4 -A6 the attatched exam paper, to help with my revision.