Learning Materials
Features
Discover
Chapter 2: Q25P (page 45)
(a) What is the vector whose tail is at m and whose head is at m? (b) What is the magnitude of this vector?
(a) The required vector is m.
(b) The magnitude of this vector is m.
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
The driver of a car traveling at a speed of 18 m/s slams on the brakes and comes to a stop in 4s . If we assume that the car's speed changed at a constant rate (constant net force): (a) what was the car's average speed during this 4 s interval? (b) How far did the car go in this 4 s interval?
Using the law of cosines, show that Eq. can be written as follows:
Whereand
are the usual spherical polar coordinates, with the z axis along the
line through. In this form, it is obvious that
on the sphere,
.
Find the induced surface charge on the sphere, as a function of. Integrate this to get the total induced charge. (What should it be?)
Calculate the energy of this configuration.
In the circuit shown in Figure 19.75, the emf of the battery is . Resistor has a resistance of , and resistor has a resistance of. A steady current flows through the circuit. (a) What is the absolute value of the potential difference across ? (b) What is the conventional current through ?
Question: (1) Two external forces,and, act on a system. What is the net force acting on the system? (2) A hockey puck initially has momentum. It slides along the ice, gradually slowing down, until it comes to a stop. (a) What was the impulse applied by the ice and the air to the hockey puck? (b) It took 3 seconds for the puck to come to a stop. During this time interval, what was the net force on the puck by the ice and the air (assuming that this force was constant)?
Here are questions about human diet. (a) A typical candy bar provides 280 calories (one “food” or “large” calorie is equal to ). How many candy bars would you have to eat to replace the chemical energy you expend doing 100 sit-ups? Explain your work, including any approximations or assumptions you make. (In a sit-up, you go from lying on your back to sitting up.) (b) How many days of a diet of 2000 large calories are equivalent to the gravitational energy difference for you between sea level and the top of Mount Everest, 8848 m above sea level? (However, the body is not anywhere near 100% efficient in converting chemical energy into change in altitude. Also note that this is in addition to your basal metabolism.)
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