Dos Mundos

¡¡Aprende física!! Si quieres aprender de forma rápida y sencilla todo lo que necesitas saber sobre física, ¡ésta tu guía! La autora es una psicóloga experta en el tratamiento de dificultades del aprendizaje con una amplia experiencia docente. ÍNDICE ACÚSTICA: 1. Acústica. 2. Sonido. 3. Características del sonido. 4. Medida del sonido. 5. Frecuencia de sonido 6. Velocidad de propagación del sonido. 7. Tipos de onda: longitudinales, transversales y estacionarias. 8. Interferencia. 9. Longitud de onda. 10. Concordancia de fase. 11. Relación entre sonido y temperatura. 12. Eco....

Intermediate through Advanced Featuring topic overviews, hundreds of practice questions, and self-evaluation keys.

El cine documental is an innovative intermediate/advanced textbook that provides students with the tools needed to communicate accurately and appropriately in Spanish. Learning is centered on cultural themes related to thought-provoking documentaries from around the Spanish-speaking world. Through the culturally rich and linguistically authentic medium of documentary film, El cine documental provides the experience of listening to many varieties of authentic speech in context, and stimulates conversation and critical thinking by immersing students in the target cultures. Organized to provide...

The Workbook / Laboratory Manual, Volume 1, provides a wealth of activities, both aural and written, that reinforce chapter content. For use with either the Audio CD Program, Part 1, available for student purchase, or with the free, downloadable MP3 files in the Online Learning Center. Covers Chapters Primeros pasos –- Chapter 9 Answers found in the appendix.