As Russ runs, his knee joint passes through the following vertical positions (meters): A. Frame 1: 0.067
B. Frame 2: 0.133
C. Frame 3: 0.212
D. Frame 4: 0.369
E. Frame 5: 0.439 The data were collected at a frequency of 100Hz (i. e. 100 frames per second - think about how this can be used to determine the time). What was the vertical acceleration of his knee joint at the third time point

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.

Which one of the following research methods can show cause and effect

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.