61. A 6-newton force and an 8-newton force actconcurrently on a box located on a frictionlesshorizontal surface. Which top-view diagramshows the forces producing the smallestmagnitude of acceleration of the box?8 N6 NTop of boxTop of box8 N6NV(1)(3)6NTop of box8 NTop of box8 N6 N(2)(4)IN

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Asked Nov 7, 2019
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61. A 6-newton force and an 8-newton force act
concurrently on a box located on a frictionless
horizontal surface. Which top-view diagram
shows the forces producing the smallest
magnitude of acceleration of the box?
8 N
6 N
Top of box
Top of box
8 N
6N
V
(1)
(3)
6N
Top of box
8 N
Top of box
8 N6 N
(2)
(4)
IN
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61. A 6-newton force and an 8-newton force act concurrently on a box located on a frictionless horizontal surface. Which top-view diagram shows the forces producing the smallest magnitude of acceleration of the box? 8 N 6 N Top of box Top of box 8 N 6N V (1) (3) 6N Top of box 8 N Top of box 8 N6 N (2) (4) IN

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Expert Answer

Step 1

(1)

 

Consider the mass of the box be m as a unit mass that is 1 kg, the angle of 6 N force from the horizontal be θ.

 

Apply Newton’s second law of motion along the horizontal on the box, consider both the forces are at 45o, and solve for the acceleration of the box given in the first diagram.

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Σ, - ma (6N)+(8 N)+2(6 N)(8 N) cos 45° = (1 kg)a 1 kg m/s 12.96 N 1N 1 kg a 12.96 m/s

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Step 2

(2)

 

Here, both the forces are perpendicular to each other, so the angle between these forces are 90o. Apply Newton’s second law of motion along the horizontal on the box, and solve for the acceleration of the box given in the second diagram.

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F 3D та Н V6NY+(8 N)+2(6 N) (8 N) cos 90" = (1 kg) a 1 kg m/s 10 N 1N а, 1 kg а, 3 10 m/s?

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Step 3

(3)

 

Here, both the forces are in same direction, so the angle between these forces is 0o. Thus, apply Newton’s second law of motion alo...

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Σ-ma 6N +(8 N)2(6 N)(8 N) cos 0° - (1 kg)4, 1 kg m/s2 14 N 1N 1 kg a 14 m/s2

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