(a) At a certain instant, a particle-like object is acted on by a force ?→=(5.60N)?̂ −(2.90N)?̂+(7.10N)?̂F→=(5.60N)î-(2.90N)ĵ+(7.10N)k̂ while the object's velocity is ?→=−(2.70m/s)?̂ +(4.60m/s)?̂v→=-(2.70m/s)î+(4.60m/s)k̂. 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 -6.50 W, what is the velocity of the object just then? (Give your answer without a unit vector.)
(a) At a certain instant, a particle-like object is acted on by a force ?→=(5.60N)?̂ −(2.90N)?̂+(7.10N)?̂F→=(5.60N)î-(2.90N)ĵ+(7.10N)k̂ while the object's velocity is ?→=−(2.70m/s)?̂ +(4.60m/s)?̂v→=-(2.70m/s)î+(4.60m/s)k̂. 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 -6.50 W, what is the velocity of the object just then? (Give your answer without a unit vector.)
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(a) At a certain instant, a particle-like object is acted on by a force ?→=(5.60N)?̂ −(2.90N)?̂+(7.10N)?̂F→=(5.60N)î-(2.90N)ĵ+(7.10N)k̂ while the object's velocity is ?→=−(2.70m/s)?̂ +(4.60m/s)?̂v→=-(2.70m/s)î+(4.60m/s)k̂. 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 -6.50 W, what is the velocity of the object just then? (Give your answer without a unit vector.)
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