Which of the following are possible units of power? A stone is launched upward I

Question

Which of the following are possible units of power? A stone is launched upward Into the air. Assuming no frictional force to due to the air, the speed of the stone at its Initial launching point is greater than less than equal to need more Info. the speed of the stone after its round trip and back to original launch position. Which of the following is always conserved in an Isolated system? momentum potential energy kinetic energy Consider two carts of masses m and 5m at rest on a frictionless air track. If you push the lighter cart for 2 s with a constant force, the momentum is K. What is the kinetic energy of the heavier cart if you push it with the same force for 8 s? Note that K = p^2/2m. A 3.0-kg ball with an initial velocity of (4i + 3j) m/s collides with a wall and rebounds with a velocity of (-4i + 3j) m/s. What is the Impulse (in kg m/s) exerted on the ball by the wall? The value of the total momentum of a system is the same at a later time compared to an earlier time if there are no. collisions between particles within the system changes of momentum of individual particles within the system. internal forces acting between particles within system. external forces acting on particles of the system.

Explanation / Answer

9) Option C) as Power = Work/Time

11) Option A)

13) Option B)

The change in momentum dP = m(v1 - v0); where v1 = -4i + 3j and v0 = 4i + 3j Thus dP = m(-4i + 3i - 4i - 3j) = 3(-8i + 0j) so the change is along the i direction only. Thus the magnitude of the momentum change (i.e., impulse) is 24 and the direction - i. Then dP = -24 N.sec

14) option D)

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