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### A space habitat is designed so that the variation in g between a person's head and feet is less than 0.01 g. If the person is 2m tall, then the min. radius of the habitat is...

200 m.

### A flywheel's diameter is twice that of another of the same shape & mass. The larger flywheel's rotational inertia is...

TWO times the other's.

### Since each rolling wheel of a railroad train is tapered, the narrow part of the wheel has a tangential speed that is...

SMALLER than that of the wide part.

### Half way to the center of a completely hollow planet with a thin uniform shell, your weight there compared to your weight on the outer surface would be...

ZERO.

### The reason the moon does not crash into the Earth is that the...

moon has a sufficient TANGENTIAL SPEED.

### A carnival has a Ferris wheel where the seats are located halfway between the center & the outside rim. Compared with a Ferris wheel with seats on are the outside rim, your ANGULAR speed while riding on this Ferris wheel would be...

the SAME and your TANGENTIAL SPEED less.

### A vertically-oriented rocket that is somehow able to maintain a continuous upward velocity of 8 km/s will...

ESCAPE from the Earth!

### A hunter on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?

The FIRED one.

### Tangential Speed

~ The speed of something moving along a CIRCULAR path. (direction of motion is always TANGENT to the circle!)

~ DIRECTLY PROPORTIONAL to Rotational Speed (@ a fixed radial distance)

### Torque

~ the ROTATIONAL counterpart of Force

~ If you want to make a stationary object rotate, apply Torque!

~ Equals: Lever Arm x Force

### Angular Momentum

~ Angular Momentum = (mass)(velocity)(radius)

~ "Inertia of rotation" of rotating objects

~ AM = (rotational inertia)(rotational velocity)