2:28 PM H20 4G session.masteringphysics.com Exercise 8.6 MasteringPhysics Two ve

Question

2:28 PM H20 4G session.masteringphysics.com Exercise 8.6 MasteringPhysics Two vehicles are approaching an intersection. One is a 2600 kg pickup traveling at 15.0 m/s from east to west (the -x- direction), and the other is a 1600 kg sedan going from south to north (the +y direction at 22.0 m/s Part A Find the z-component of the net momentum of this system kg m/s Give Up Submit Part B Find the y component of the net momentum of this system kg m/s Give Up Submit Part C What is the magnitude of the net momentum? kg m/s

Explanation / Answer

A.

Px = m1*v1x + m2*v2x

since v2x = 0, so

Px = m1*v1x

Px = 2600*(-15) i = -39000 i

B.

Py = m2*v2y

since v1y = 0,

Py = 1600*(+22) = 35200 j

C.

Pnet = Px + py

Pnet = -39000 i + 35200 j

|Pnet| = sqrt ((-39000)^2 + 35200^2) = 52536.08 kg-m/sec

D.

direction = arctan (-35200/39000) = 42.07 deg CW from -x-axis

direction = 137.93 deg from +x-axis

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