Physical components of a system, question from class 3rd gateway to IT book of computer
Answers
Answer:
Computer hardware includes the physical, tangible parts or components of a computer, such as the cabinet, central processing unit, monitor, keyboard, computer data storage, graphics card, sound card, speakers and motherboard.[1] By contrast, software is instructions that can be stored and run by hardware. Hardware is so-termed because it is "hard" or rigid with respect to changes or modifications; whereas software is "soft" because it is easy to update or change. Intermediate between software and hardware is "firmware", which is software that is strongly coupled to the particular hardware of a computer system and thus the most difficult to change but also among the most stable with respect to consistency of interface. The progression from levels of "hardness" to "softness" in computer systems parallels a progression of layers of abstraction in computing.
Hardware is typically directed by the software to execute any command or instruction. A combination of hardware and software forms a usable computing system, although other systems exist with only hardware components.
Answer:
Falls are serious at any age, and breaking a bone after a fall becomes more likely as a person ages. Many of us know someone who has fallen and broken a bone. While healing, the fracture limits the person’s activities and sometimes requires surgery. Often, the person wears a heavy cast to support the broken bone and needs physical therapy to resume normal activities. People are often unaware of the frequent link between a broken bone and osteoporosis. Known as a silent disease because it progresses without symptoms, osteoporosis involves the gradual loss of bone tissue or bone density and results in bones so fragile they break under the slightest strain. Consequently, falls are especially dangerous for people who are unaware that they have low bone density. If the patient and the doctor fail to connect the broken bone to osteoporosis, the chance to make a diagnosis with a bone density test and begin a prevention or treatment program is lost. Bone loss continues, and other bones may break.
Even though bones do not break after every fall, the person who has fallen and broken a bone nearly always becomes fearful of falling again. As a result, she or he may limit activities for the sake of “safety.” Among Americans age 65 and older, fall-related injuries are the leading cause of accidental death.
This publication explores the components of the Fracture Triangle and offers tips for reducing the chances of fall-related fractures that result from low bone mass and osteoporosis. If one of the following three factors is modified, the chances of breaking a bone are greatly reduced: