7. A 1 cm long screw that is 62.5% efficient in pulling a 500 N board to a wall when
the carpenter used 80 N of force in turning it. What is the thread length of the
screw?

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.