Why don't skateboarders keep flying through the air when they launch off a ramp? * 3 points a. the force of gravity works against the skateboarders' inertia. b. skateboard wheels don't spin fast enough to keep them moving very far. c. the skateboarders have no inertia when they launch off a ramp. d. skateboards do not use newtons to move around the ramps.

Which best describes the difference between internal and thermal energy?

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)