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(a) At a certain instant, a particle-like object is acted on by a force F = (4.20 N )î – (1.90 N )ŷ + (5.20 N )k while the object's velocity is V = - (1.50 m/s )i + (3.00 m/s )k.What is the instantaneous rate at which the force does work on the object? (b) At some other time, the velocity consists of only a y component. If the force is unchanged, and the instantaneous power is -8.60 W, what is the velocity of the object just then? (Give your answer without a unit vector.) (a) Number i Units (b) Number i Units

(a) At a certain instant, a particle-like object is acted on by a force F = (4.20 N )î – (1.90 N )ŷ + (5.20 N )k while the object's velocity is V = - (1.50 m/s )i + (3.00 m/s )k.What is the instantaneous rate at which the force does work on the object? (b) At some other time, the velocity consists of only a y component. If the force is unchanged, and the instantaneous power is -8.60 W, what is the velocity of the object just then? (Give your answer without a unit vector.) (a) Number i Units (b) Number i Units

University Physics Volume 1
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter8: Potential Energy And Conservation Of Energy
Section: Chapter Questions
Problem 81AP: Repeat the preceding problem, but this time, suppose that the work done by air resistance cannot be...
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(a) At a certain instant, a particle-like object is acted on by a force F = (4.20 N )î – (1.90 N )ŷ + (5.20 N )k while the object's velocity is v = – (1.50 m/s )i + (3.00 m/s )k. What is the instantaneous rate at which the force does work on the object? (b) At some other time, the velocity consists of only a y component. If the force is unchanged, and the instantaneous power is -8.60 W, what is the velocity of the object just then? (Give your answer without a unit vector.) (a) Number i Units (b) Number Units
Transcribed Image Text:(a) At a certain instant, a particle-like object is acted on by a force F = (4.20 N )î – (1.90 N )ŷ + (5.20 N )k while the object's velocity is v = – (1.50 m/s )i + (3.00 m/s )k. What is the instantaneous rate at which the force does work on the object? (b) At some other time, the velocity consists of only a y component. If the force is unchanged, and the instantaneous power is -8.60 W, what is the velocity of the object just then? (Give your answer without a unit vector.) (a) Number i Units (b) Number Units
The figure gives the acceleration of a 6.0 kg particle as an applied force moves it from rest along an x axis from x = 0 to x = 9.0 m. The scale of the figure's vertical axis is set by ag = 10.0 m/s?. How much work has the force done on the particle when the particle reaches (a) x = 4.0 m, (b) x = 7.0 m, and (c) x = 9.0 m? What is the particle's speed and direction (give positive answer if the particle moves along x axis in positive direction and negative otherwise) of travel when it reaches (d) x = 4.0 m, (e) x = 7.0 m, and (f) x = 9.0 m? x (m) 4 16 -a, (a) Number i Units (b) Number i Units (c) Number i Units (d) Number i Units (e) Number i Units (f) Number i Units > > > > >
Transcribed Image Text:The figure gives the acceleration of a 6.0 kg particle as an applied force moves it from rest along an x axis from x = 0 to x = 9.0 m. The scale of the figure's vertical axis is set by ag = 10.0 m/s?. How much work has the force done on the particle when the particle reaches (a) x = 4.0 m, (b) x = 7.0 m, and (c) x = 9.0 m? What is the particle's speed and direction (give positive answer if the particle moves along x axis in positive direction and negative otherwise) of travel when it reaches (d) x = 4.0 m, (e) x = 7.0 m, and (f) x = 9.0 m? x (m) 4 16 -a, (a) Number i Units (b) Number i Units (c) Number i Units (d) Number i Units (e) Number i Units (f) Number i Units > > > > >
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