(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
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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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
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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>
>
>
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