Who was the first person to study polarization of light? -Huygens
-Newton
-Galileo
-Copernicus

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?