Learning Materials
Features
Discover
Chapter 9: 9.Q. 14 (page 227)
The motor of a crane uses power P to lift a steel beam. By what factor must the motor’s power increase to lift the beam twice as high in half the time?
Power becomes 4P , that is four times.
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
Evaluate the dot product of the three pairs of vectors in
Figure
What is the angle between vectors and in each part of
When a cheerleader stands on a vertical spring, the spring compresses by . When a second cheerleader stands on the shoulders of the first, the spring compresses an additional . What is the mass of the second cheerleader?
In Problems through you are given the equation(s) used to solve a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
A hydroelectric power plant uses spinning turbines to transform the kinetic energy of moving water into electric energy with efficiency. That is, of the kinetic energy becomes electric energy. A small hydroelectric plant at the base of a dam generates of electric power when the falling water has a speed of . What is the water flow rate—kilograms of water per second—through the turbines?
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