Mechanical mouse has a ball that turns rollers inside. If friction is lost between the ball and the mousing surface, or between the ball and the rollers, the mouse fails to work. In order to assure good contact with the mousing surface, the ball must be fairly heavy. When you change directions with the mouse, you must make the ball change rolling directions--an action that inertia likes to prevent.
An optical mouse makes use of an LED and some optics to detect surface texture and the changes in it as the mouse is moved. There are no moving parts
Answer:
I think he may be a nut, but I'm not sure, there's little evidence of what he says to be true.
Yes excel has more than 400 functions
Answer:
The program in QBasic is as follows;
PRINT "Number: "
INPUT N
LET FACT = 1
FOR I = 1 TO N
FACT = FACT * I
NEXT I
PRINT FACT
END
Explanation:
This prompts user for number
PRINT "Number: "
This accepts input from the user
INPUT N
This initializes the factorial to 1
LET FACT = 1
This iterates through the number the user inputs and calculates its factorial
<em>FOR I = 1 TO N
</em>
<em> FACT = FACT * I
</em>
<em>NEXT I
</em>
This prints the factorial
PRINT FACT
The program ends here
END
Not sure on the first question, but the second would be answer choice a: Travel.state.gov since a website with .gov at the end tend to be trustworthy sources
