A 20.0-N box rests on a 50.0-N box on a perfectly smooth horizontal floor. When

Question

A 20.0-N box rests on a 50.0-N box on a perfectly smooth horizontal floor. When a horizontal 15.0-N pull to the right is exerted on the lower box (see figure), both boxes move together. Find the magnitude of the external force on the upper box. An 83.0 kg spacewalking astronaut pushes off a 645 kg satellite, exerting a 120 N force for the 0.480 s it takes him to straighten his arms. Part A How far apart are the astronaut and the satellite after 1.40 min? Express your answer with the appropriate units.

Explanation / Answer

A 2.0-N box resets on a 50.0-Nperfectly smooth horizontol floor

horizontol 15.0-N pull to the right

Weight = mg.

A 20 N box means that the mass, times g, is 20 N.

T = m2a m2 = 20/10 = 2 Kg

15-T = m1a m1 = 5 kg

acceleration = 15/7

= 2.143 m/se2

T = 4.2857 N

towards right on upper block

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