Answer:
The star must be moving "closer" to the earth because the wave fronts that are being emitted are shifted toward the blue end of the spectrum (they are closer together)
To calculate MA = force needed/force used
Example
MA = 60/30 = 2
The mechanical advantage is 2
Answer: Your using your skeletal muscle
Explanation:
Normal force is the force exerted when an object is on an surface. So an example could be a pile of books on top of a table.
