A wagon wheel is constructed as such: eight spokes each have a mass of 0.280kg and are 0.3m long. The outer rim has a mass of 1.4kg. A small 10g mass is attached by a string of negligible mass. a) What is the moment of inertia of the wheel about an axis through its center and perpendicular to the plane of the wheel?
b) The 10g mass is released from rest, what is the torque on the wheel?
c) What is the angular acceleration of the wheel?

The four giant gas points that are made primarily of lightweight elements are

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.

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the