Chapter 8: Q73P (page 208)

The temperature of a plastic cube is monitored while the cube is pushed 3.0 macross a floor at constant speed by a horizontal force of 15 N. The thermal energy of the cube increases by 20 J. What is the increase in the thermal energy of the floor along which the cube slides?

Short Answer

Expert verified

Increase in thermal energy of floor, $E_{t h (f l o o r)} = 25 J$

Step by step solution

Given

Displacement of the cube d = 3.0 m
Force applied to the cube $F_{a p p} = 15 N$
increase in thermal energy of cube $∆ E_{t h (c u b e)} = 20 J$

To understand the concept

Here the block and floor form a system. Use the concept that the total increase in thermal energy of the system is the sum of the increase in thermal energy of the cube and the floor.

Formula:

$∆ E_{t h (s y s t e m)} = ∆ E_{t h (c u b e)} + ∆ E_{t h (f l o o r)}$

Calculate the increase in the thermal energy of the floor along which the cube slides

Work done by applied force:

$W_{a p p} = F d \cos ϕ W_{a p p} = 15 \times 3 \cos 0 W_{a p p} = 45 J (i) W_{a p p} = i n c r e a s e i n t h e h e a t e n e r g y o f t h e s y s t e m Using equation (i) and given value, W_{a p p} = ∆ E_{t h (c u b e)} + ∆ E_{t h (f l o o r)} 45 = 20 + ∆ E_{t h (f l o o r)} ∆ E_{t h (f l o o r)} = 45 - 20 ∆ E_{t h (f l o o r)} = 25 J$

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Physics Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

The temperature of a plastic cube is monitored while the cube is pushed 3.0 macross a floor at constant speed by a horizontal force of 15 N. The thermal energy of the cube increases by 20 J. What is the increase in the thermal energy of the floor along which the cube slides?

Short Answer

Step by step solution

Given

To understand the concept

Calculate the increase in the thermal energy of the floor along which the cube slides

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Force

Further Mechanics and Thermal Physics

Atoms and Radioactivity

Oscillations

Geometrical and Physical Optics

Quantum Physics

Study anywhere. Anytime. Across all devices.