Questions
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QUESTIONS
1 Can the sum of the magnitudes of two vectors ever be equal to the magnitude of the sum of the same two
vectors? If no, why not? If yes, when?
Answer:
yes, when the vectors are in same direction
2 The two v
Questions
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QUESTIONS
1 Figure 2-14 gives the velocity of a particle moving on an x axis. What are (a) the initial and (b) the final
directions of travel? (c) Does the particle stop momentarily? (d) Is the acceleration positive o
Review and Summary
Conservative Forces A force is a conservative force if the net work it does on a particle moving around any
closed path, from an initial point and then back to that point, is zero. Equivalently, a force is conservative if the net
work i
Review &
Summary
Angular Position To describe the rotation of a rigid body about a fixed axis, called the rotation
axis, we assume a reference line is fixed in the body, perpendicular to that axis and rotating with
the body. We measure the angular positio
84
. (a) To stretch the spring an external force, equal in magnitude to the force of the
spring but opposite to its direction, is applied. Since a spring stretched in the positive x
direction exerts a force in the negative x direction, the applied force m
Review and summery
Angular Position To describe the rotation of a rigid body about a fixed axis, called the rotation axis, we assume a
reference line is fixed in the body, perpendicular to that axis and rotating with the body. We measure the angular
posit
48
Particle A and particle B are held together with a compressed spring between them. When they are released, the spring pushes them apart, and they then fly off in opposite
directions, free of the spring. The mass of A is 2.00 times the mass of B, and th
Review & Summary
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REVIEW & SUMMARY
AngularPosition To describe the rotation of a rigid body about a fixed axis, called the rotation axis, we
assume a reference line is fixed in the body, perpendicular to that axis and rotating w
Problems
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PROBLEMS
sec.10-2TheRotationalVariables
1 A good baseball pitcher can throw a baseball toward home plate at 85 mi/h with a spin of 1800 rev/min. How
many revolutions does the baseball make on its way to home plate? Fo
Ch 9
Review &
Summary
Center of Mass The center of mass of a system of n particles is defined to be the point whose
coordinates are given by
(9-5)
or
(9-8)
where M is the total mass of the system.
Newton's Second Law for a System of Particles The motion o
Uniformly Accelerated Motion
Conclusion
As an object is uniformly accelerated, the time that it takes to travel a
certain distance decreases exponentially as its overall velocity only increases
at that constant rate of acceleration. In this lab, we learne