In control theory, assuming that a system is LTI, the Laplace transform of a form of this quantity yields the transfer function. The convolution of a function f of x with a function named for this quantity of x minus y yields f of y; (-5[1])that is this function’s “sifting property.” (15[1])For a linear differential (-5[1])operator L, the Green’s function of L is (15[1])defined as the “response” (15[1])form of this quantity. In Tsiolkovsky’s rocket equation, multiplying this quantity with (*) gravity gives the effective exhaust velocity. (-5[1])The Dirac delta function, whose value is zero everywhere except at the origin, is alternatively known as the “unit function” of this quantity. (10[1])Assuming a general force (10[1])F of t, this quantity equals the definite integral of “F of t times d t.” For 10 points, name this quantity defined as the change of momentum. ■END■ (10[2]0[1])