Question

Power applied to the particle varies with time as P = (2t + 2) w, find the work done by it at t=2 sec.​

Answer 1

""❤️ Answer ❤️ ""

Energy supplied to the system = change in energy of system.

Since only energy of system is kinetic,

∫Pdt= ΔKE=

2

∫

2

4

2t+ 1dt= [t

3

−

t 2

t]

2

4

ΔKE=

4 3

4 2

4−

2 3

2 2

2= 46J

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Answer 2

Energy supplied to the system = change in energy of system.

Since only energy of system is kinetic,

∫Pdt=ΔKE=∫24 3t²−2t+1dt=[t³ −t² +t]2 4

ΔKE=4³ −4²+4−2³+2² −2=46J

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Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called minification or de-magnification.