Learning Materials
Features
Discover
Chapter 2: Q45P (page 45)
In gold at room temperature, the mobility of mobile electrons is about , and there are about mobile electrons per cubic meter. Calculate the conductivity of gold, including correct units.
The conductivity of gold is .
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
A comet passes near the Sun. When the comet is closest to the Sun, it is m from the Sun. You need to choose a time step to use in predicting the comet’s motion. Which of the following would be a reasonable distance for the comet to move in one time step, doing an iterative calculation by hand?
A playground ride consists of a disk of mass and radius mounted on a low-friction axle (Figure 11.94). A child of mass runs at speed on a line tangential to the disk and jumps onto the outer edge of the disk.
(a.) If the disk was initially at rest, now how fast is it rotating? (b) What is the change in the kinetic energy of the child plus the disk? (c) where has most of this kinetic energy gone? (d) Calculate the change in linear momentum of the system consisting of the child plus the disk (but not including the axle), from just before to just after impact. What caused this change in the linear momentum? (e) The child on the disk walks inward on the disk and ends up standing at a new location a distance from the axle. Now what is the angular speed? (f) What is the change in the kinetic energy of the child plus the disk, from the beginning to the end of the walk on the disk? (g) What was the source of this increased kinetic energy?
As your spaceship coasts towards Mars, you need to move a heavy load of 1200 kg along a hallway of the spacecraft that has a right turn, without touching the walls, floor, or ceiling, by working remotely, using devices attached to the load that can be programmed to fire blasts of compressed air for up to in any desired direction. During a blast the load is subjected to a force of . The center of the load must move 3 m along the first section of the hallway, starting from rest, then 4 m along the second section, ending at rest. Let the starting point be , with the first section ending at and the second section ending at . Using just three blasts of compressed air, choose the times when these blasts should be scheduled, their durations, and their directions. How long does it take to complete the entire move?
As shown in Figure 19.74, a spherical metal shell of radius has a charge (on its surface) and is surrounded by a concentric spherical metal shell of radius which has a charge (on its inner surface).
(a) Use the definition of capacitance: to find the capacitance of this spherical capacitor.
(b) If the radii of the spherical shells and are large and nearly equal to each other, show that can be written as (which is also the equation for the capacitance of a parallel-plate capacitor) where is the surface area of one of the spheres, and is the small gap distance between them .
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App