The human head is about 7.5% of a person's body mass. If you weigh 70 kg, how heavy, in grams, is your head

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?