# Physics Homework

## electric field of spherically symmetric charge distribution

Please help with calculation steps. A spherically symmetric charge distribution produces the electric field E = (5700r^2) N/C, where r is in m a) what is the electric field strength at r = 25.0 cm? b) What is the electric flux through a 34.0-cm diameter spherical surface that is concentric with the charge distribution? c) […]

## Set of three problems on Newton’s laws of motion

1) A window washer of mass M is sitting on a platform suspended by a system of cables and pulleys as shown (see attachment). He is pulling on the cable with a force of magnitude F . The cables and pulleys are ideal (massless and frictionless), and the platform has negligible mass. Find the magnitude […]

## Angular Speed of Rotating Hoop

A string is wrapped several times around the rim of a small hoop with radius r and mass m . The free end of the string is held in place and the hoop is released from rest. Calculate the angular speed of the rotating hoop after it has descended a distance, h. (See attached file […]

## dS = dq/T for irreversible processes

How can ds = dqr/T (d-bar q(reversible) / T) can be used to determine the entropy increase of a system in an irreversible process. Why does this technique works? Suppose some system undergoes an irreversible process. It was initially in some state of thermal equilibrium at some pressure volume, temperature (thermal equilibrium means simply that […]

## Newton’s Laws of Motion

Please also see the attached file. The fig. shows a uniformly dense rectangular brick of length a, height b resting on a rough inclined plane of angle theta. The interface between surface and brick has associated coefficients of friction us, uk. A force F is applied as indicated. a) For F = 0, and varying […]

## Rotation of a Wheel

A wheel accelerates with a constant angular acceleration of 4.5 rad/s^2. If the initial angular velocity is 1.0 rad/s, what is the angle through which the wheel rotates in 2.0 s? Please provide detailed explanation. Solution Preview A wheel rotates with constant angular acceleration If the initial angular velocity … Solution Summary We compute the […]

## Working with electrostatics –

1.The anode (positive terminal) of an X-ray tube is at a potential of +90 000 V with respect to the cathode (negative terminal). (a) How much work (in joules) is done by the electric force when an electron is accelerated from the cathode to the anode? (b) If the electron is initially at rest, what […]

## Finding Ratio of Wave Speeds in Two Strings

Two steel guitar strings have the same length. String A has a diameter of 0.50 mm and is under 410.0 N of tension. String B has a diameter of 1.0 mm and is under a tension of 820.0 N. Find the ratio of the wave speeds, vA/vB, in these two strings. Solution Preview Velocity v […]

## Distribution Channels, Logistics, and the Effects

1. What is a distribution channel? What is the relationship between channels of distribution and logistics? How does geographical location affect your selection of distribution channels? A distribution channel is a way of selling a company’s product either directly or via distributors; “possible distribution channels are wholesalers or small retailers or retail chains or direct […]

## Electrostatics: Capacitance of a spherical capacitor.

A spherical capacitor is formed from two concentric, spherical conducting shells separated by vacuum. The inner sphere has radius 15.0 cm, and the capacitance is 116 pF. 1.) What is the radius of the outer sphere? 2.) If the potential difference between the two spheres is 220 V, what is the magnitude of charge on […]

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