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RideAnS [48]
3 years ago
9

To understand the meaning and possible applications of the work-energy theorem. In this problem, you will use your prior knowled

ge to derive one of the most important relationships in mechanics: the work-energy theorem. We will start with a special case: a particle of mass m moving in the x direction at constant acceleration a. During a certain interval of time, the particle accelerates from vi to vf, undergoing displacement s given by s=xf−xi.
A. Find the acceleration a of the particle.
B. Evaluate the integral W = integarvf,vi mudu.
Physics
1 answer:
sladkih [1.3K]3 years ago
8 0

Answer:

a) the acceleration of the particle is (  v_f² - v_i² ) / 2as

b) the integral W = \frac{1}{2}m( _f² - v_i² )

Explanation:

Given the data in the question;

force on particle F = ma

displacement s = x_f - x_i

work done on the particle W = Fs = mas

we know that; change in energy = work done       { work energy theorem }

\frac{1}{2}m(  v_f² - v_i² ) = mas

\frac{1}{2}(  v_f² - v_i² ) = as

(  v_f² - v_i² ) = 2as

a = (  v_f² - v_i² ) / 2as

Therefore, the acceleration of the particle is (  v_f² - v_i² ) / 2as

b) Evaluate the integral W = \int\limits^{v_{f} }_{v_{i} } mvdv

W = \int\limits^{v_{f} }_{v_{i} } mvdv

W =m[\frac{v^{2} }{2} ]^{vf}_{vi}

W = \frac{1}{2}m( _f² - v_i² )

Therefore, the integral W = \frac{1}{2}m( _f² - v_i² )

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