Question bank: Simple and Thermal Machines

Access these and thousands of other questions, create assignments, projects, and lesson plans in minutes.

Question 1:

Easy

A spring is a mechanical device that stores energy. When it is deformed, it stores kinetic energy. When it is released, it releases that energy. Which of the following statements below is correct?

Simple and Thermal Machines

Contextualized Question

Question 2:

Hard

A thermal machine operates with a hot reservoir at a temperature of 500°C and a cold reservoir at 100°C. The machine receives 2000 J of heat from the hot reservoir and, operating according to the Carnot cycle, performs a work W. Considering that the efficiency of a Carnot thermal machine is given by η = 1 - (Tc/Th), where η is the efficiency, Tc is the temperature of the cold reservoir, and Th is the temperature of the hot reservoir, calculate the work done by the thermal machine. Then, relate the concept of efficiency of a thermal machine to the concept of energy efficiency, explaining how the machine's efficiency is related to the amount of heat wasted during the process. For the calculation of work, use the formula W = η * Qh, where W is the work done, η is the efficiency of the Carnot machine, and Qh is the heat received from the hot reservoir.

Simple and Thermal Machines

Multidisciplinary Question

Question 3:

Easy

In an amusement park, the Ferris wheel is an attraction that combines concepts of simple and thermal machines. With the initial rotation provided by an electric motor, the Ferris wheel maintains its movement through a system of gears and bearings. Suppose that, due to friction, the mechanical energy of the Ferris wheel dissipates in the form of heat. 1. Explain how the Ferris wheel can be seen as a practical application of a thermal machine, and discuss the role of simple machines, such as levers and pulleys, in the operation of this attraction. 2. Evaluate the importance of friction management and energy efficiency in the design and maintenance of an amusement park, considering the impacts on operating costs and visitor experience.

Simple and Thermal Machines

Contextualized Question

Question 4:

Easy

Internal combustion engines are devices that generate motion from the explosion of a fuel inside a closed chamber. This technology was developed in the 19th century and enabled the creation of transportation vehicles, agricultural machinery, and other equipment. Which of the alternatives below is not one of the main components of this engine?

Simple and Thermal Machines

Contextualized Question

Question 5:

Medium

A timing belt is a flexible belt made of materials resistant to abrasion and weathering, with teeth on its inner surface that fit into the grooves of the toothed wheels on the pulleys and rollers. Which of these two mechanical parts has a greater force transmission capacity?

Simple and Thermal Machines

Contextualized Question

IARA TIP

Create lists and assessments from these and other 130 questions of Simple and Thermal Machines

Didn't find what you were looking for? Try searching in a different way!

Grade

Select a grade

Subject

Select a subject

Why are Teachy's Question Banks the most complete available?

Complete platform:

With over 200,000 new questions from reputable sources, the question bank provides a wide range of resources to enhance your teaching materials.

Custom filters:

You can find specific questions based on subject and grade level, across various difficulty types, within hundreds of educational themes. This way, you can create personalized lists in just a few minutes.

Focus on students:

With Teachy's Question Bank, you ensure the success of your classes. We offer high-quality materials, carefully selected and aligned with the National Common Curricular Base, essential for any educational product.

Time for what matters:

The platform's easy access allows teachers to save time when planning their lessons. The materials can be accessed in just a few clicks, making pedagogical preparation straightforward and efficient.

Access anywhere:

Teachy provides the flexibility to access the question bank from anywhere, at any time. With this accessibility, teachers have more freedom to manage their time and resources, making their work more efficient.

See other related topics on Simple and Thermal Machines

Didn't find what you were looking for?

Get full access to dozens of subjects and hundreds of materials on Teachy!