Titleist Ohio State Visor

Revenge of Sylvester

reserved Contribution to Class IV C.

The problem that I propose is a classic use of the concept of center of mass.
Consider a cage that contains, on a perch, the canary Tweety.
The cage is suspended from the ceiling by a spring and all Canary + Cage equilibrium is reached. Sylvester, now exasperated, takes aim and fires a gun Tweety shot to death. Tweety falls from its perch on the bottom of the cage. These are the questions:

1) During the fall of Tweety, the cage rises, falls or stays in the same position?

2) Once the canary is lying on the bottom of the cage and is back in balance, its position is lower, higher or unchanged compared to the previous case?

Bonuses:

for participation: +

for significant contributions even if not decisive: + +

for a complete solution of two questions: + + + +

Timing: 24:00 hours next Saturday.
Good job.

Lacrosse Gloves Sizes

The figure shows a body resting on a horizontal surface with friction.

The body is pressed against a rigid rod of a compressed spring. Explain why, in this situation, it is not possible to determine either the direction nor the magnitude of friction force.

Bonuses: A (+ +) in the first comment makes sense, a (+) next to each significant comment; (+++) to a solution of the question.

Deadline: Thursday 12 / 4 / 07, 24:00.

Crepes Using Krusteaz

friction and balance to the class III


Abandoned nelo space!

An astronaut in space sees abandoned his ship a short distance but has only an oxygen tank vacuum which can discard.

Try to describe a sequence of operations that will enable it to reach the ship.

Does it matter the mass of the fuel tank to reach the spacecraft at any given time?