An acoustic piano usually has a protective wooden case surrounding the soundboard and metal strings, which are strung under great tension on a heavy metal frame. Pressing one or more keys on the piano's keyboard causes a padded hammer (typically padded with firm felt) to strike the strings. The hammer rebounds from the strings, and the strings continue to vibrate at their resonant frequency.
Dollars and Sense: The Cost of a Bad Hire. Hiring employees isn't cheap: On average, small business owners spend $1,872 to hire someone new, according to a study from the job search site Monster.
Respondents were found to have attended a median of 12 residency interviews and spent a median of 20 days on the road. The median total cost of the interview process (excluding residency applications) was $4000 or $330 per interview.