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Chapter 7: Q7CP (page 300)

You lift a heavy box. We鈥檒l consider this process for different choices of system and surroundings. (a) Choose the box as the system of interest. What objects in the surroundings exert significant forces on this system? (b) Choose you and the box as the system of interest. What objects in the surroundings exert significant forces on this system? (c) Choose you, the box, and the Earth as the system of interest. What objects in the surroundings exert significant forces on this system?

Short Answer

Expert verified
  1. The objects from the surrounding that exerts force on the system are the individual and the Earth.
  2. The objectsfrom the surrounding that exerts force on the system arethe floor and the Earth.
  3. Nothing will exert force on the system (box, the individual, and the Earth).

Step by step solution

01

Explanation of the system and surrounding

The things that are not included in the system are defined as the surroundings and the part that is selected for the consideration is defined the system.

02

Indication of the objects from the surrounding that exerts force on the system when box is considered as system

The objects from the surrounding that exerts force on the system are as follows,

The individual and the Earth

The body of the individual exerts the normal reaction force on the box and the Earth exerts the force due to gravity which is also called weight of the object and it is given by,

W=mg

Here, m is the mass of the object and g is the acceleration due to gravity.

Thus, the objects from the surrounding that exerts force on the system are the individual and the Earth.

03

Indication of the objects from the surrounding that exerts force on the system when box and the individual is considered as system

The objects from the surrounding that exerts force on the system are as follows,

The floor and the Earth

The floor on which the individual is standing exerts the normal reaction force and the Earth exerts the force due to gravity which is also called weight of the object and it is given by,

W=mg

Thus, the objects from the surrounding that exerts force on the system are the floor and the Earth.

04

Indication of the objects from the surrounding that exerts force on the system when box, the individual, and the Earth is considered as system

The objects from the surrounding that exerts force on the system are as follows,

None of the objects from the surrounding will exerts force on the system that includes box, the individual, and the Earth.

Thus, nothing will exert force on the system (box, the individual, and the Earth.

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Most popular questions from this chapter

(a) Using the equation for the amplitudeA , show that if the viscous friction is small, the amplitude is large when 蝇Dis approximately equal to蝇F . Using the equation involving the phase shift蠁 , show that the phase shiftis approximately0掳 for very low driving frequency蝇D , approximately180掳 for very high driving frequency蝇D , and90掳 at resonance, consistent with your experiment.

(b) Show that with small viscous friction, the amplitudeA drops to12 of the peak amplitude when the driving angular frequency differs from resonance by this amount:

|蝇F-蝇D|鈮�c2m蝇F

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