Learning Materials
Features
Discover
Chapter 2: Q34P (page 45)
The position of a golf ball relative to the tee changes fromm tom insecond. As a vector, write the velocity of the golf ball during this short time interval.
The velocity of the golf ball is: m/s.
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
Question: The following questions refer to the circuit shown in Figure 18.114, consisting of two flashlight batteries and two Nichrome wires of different lengths and different thicknesses as shown (corresponding roughly to your own thick and thin Nichrome wires).
The thin wire is 50 cm long, and its diameter is 0.25 mm. The thick wire is 15 cm long, and its diameter is 0.35 mm. (a) The emf of each flashlight battery is 1.5 V. Determine the steady-state electric field inside each Nichrome wire. Remember that in the steady state you must satisfy both the current node rule and energy conservation. These two principles give you two equations for the two unknown fields. (b) The electron mobility
in room-temperature Nichrome is about . Show that it takes an electron 36 min to drift through the two Nichrome wires from location B to location A. (c) On the other hand, about how long did it take to establish the steady state when the circuit was first assembled? Give a very approximate numerical answer, not a precise one. (d) There are about mobile electrons per cubic meter in Nichrome. How many electrons cross the junction between the two wires every second?
Calculate the potential difference along the closed path consisting of two radial segments and two circular segments centred on the charge Q. Show that the four ΔV’s add up to zero. It is helpful to draw electric field vectors at several locations on each path segment to help keep track of signs.
Question: A truck driver slams on the brakes and the momentum of the truck changes from toindue to a constant force of the road on the wheels of the truck. As a vector, write the net force exerted on the truck by the surroundings.
A person of mass 70 kgrides on a Ferris wheel whose radius is 4 m . The person's speed is constant at 0.3 m/s . The person's location is shown by a dot in Figure 5.78 .
(a) What is the magnitude of the rate of change of the momentum of the person at the instant shown?
(b) What is the direction of the rate of change of momentum of the person at the instant shown?
(c) What is the magnitude of the net force acting on the person at the instant shown? Draw the net force vector on the diagram at this instant, with the tail of the vector on the person.
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?
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