Which one of the following is the correct option for fill in the blank: mechanical, electrical, chemical?
The (blank) advantage of a machine is the factor by
which the machine changes the input force.

20 points!!

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

What is the specific heat of wood ?

How is an electron dot structure used to represent a covalent bond?