While studying projectile motion, we consider ideal scenarios, where the projectile travels along its trajectory only under the influence of gravity. in real-world situations, however, other forces act on the projectile.

consider a cargo plane that is dropping relief packages to flood victims. in predicting and studying this motion, we might consider gravity, but ignore the horizontal and vertical forces associated with drag (or air friction). discuss this simplification. specifically address these questions:
•why do we often ignore drag in projectile predictions?
•what conditions (of the object, its surroundings, and its launch) do you think might make drag a significant factor in the relief package drop?
•how would drag affect the projectile's motion if it really were a significant factor in the relief package drop?

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below. your friend goes first, and you follow after he has dropped a distance of 2.0m. when your friend hits the water, is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field. it is in the opposite direction from that of the original external field. it has a direction determined entirely by the charge on its surface. it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0