Consider a situation where change in momentum come from a change in mass rather than that coming from a change in velocity of an object: rocket propulsion. The propelling gases exert force on the rocket. The gases are expelled at a rate of R = 1300 kg/s with a speed of v = 4.5 × 104 m/s. a) What is the mass expelled in time ∆t. Label this mass ∆m. b) How much momentum does the mass carry, in terms of ∆t, R, and v. c) Use the relationship between the average force and change in momentum to obtain the expression for the average force in terms of R and v and calculate its value.

Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r