6. calculate the total mechanical energy of a pendulum (mass = 4kg) as it swings from its highest point to its lowest point. use your equations for gravitational potential energy and kinetic energy to determine these values based on the data given below. total energy is the sum of gravitational potential energy and kinetic energy. in this problem, round gravity to: g = 10 m/s2. a. (6pts) complete this table (show your work in the blue blocks below! ) highest point lowest point velocity (m/s) 0.0 5.0 height (m) 1.25 0.0 kinetic energy (j) potential energy (j) total energy (j)

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b. refraction c. diffraction d. interference