1. Show how the alternative definition of power, found in your book, can be derived by substituting the definitions of work and speed into the standard definition of power, P = W / delta t.

2. A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not.

Question

1.   Show how the alternative definition of power, found in your book, can be derived by substituting the definitions of work and speed into the standard definition of power, P = W / delta t. 

2.   A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not.

anonymous · Answer

$$P=W/Deltat $$
$$P=(F Deltax)/Deltat$$
$$P=F(Deltax/Deltat)$$
$$P=F(Vavg)$$

anonymous · Answer

No. Because according to Law of Conservation of Energy we have KEi+Eloss=0 and
KE=-Eloss. The energy lost and the force that causes it to comes to a stop is friction. It is dissipated into forms of energy such as heat.