Light bending at a boundary is caused by differences in the speed of light in different materials. The greater the difference in speed, the more the light bends. You looked at three materials in this activity—air, water, and glass. In which two materials is the speed of light the most similar? Explain your answer.

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

Gunpowder residue is most likely to show up where on a shooters hands