2 questions... no math?

Question

--- If you find a pendulum clock running slightly fast, how can you adjust it to keep better time?(what exactly is a pendulum clock?)

--- From the top of a tall building, you drop 2 table tennis balls, one filled with air and the other w/ water. Both experience air resistance as they fall. Which ball reaches TERMINAL VELOCITY first? Do both hit the ground at the same time?
( i know the answer to the second question, but i read wut terminal velocity is but how do u kno which one reaches first?) .....




only if u want to explain:

Ok, its often said that 1 kg = 2.2 lb (right?)... what does this sentence mean??? and what would be the proper way of making the comparison (if u had to)??\



thnx.. a LOT

NO ONE ELSE HAS TO ANSWER... I GOT IT ...


THNX GUYS ;)!

Answer 1

Pendulum clock is clock based on a swinging weight. If you change the length of the swinging arm you change the time for each swing.

Since wind resistance starts out as nothing and gets stronger, the slower (final speed) object reaches T.V. first.

The problem with 1kg=2.2 pounds is pounds is force and kg is mass. But on the surface of the earth kg=kgf (kilogram force) so you should say 1 kgF=2.2lbs

Answer 2

1. Either lengthen the pendulum or increase its weight slightly. A pendulum clock is a mechanical device which uses the periodic motion of a swinging pendulum to keep a consistent time count.

2. The lighter ball will reached terminal velocity first. If there is air resistance, the heavier ball will reach the ground first. In vacuum space, both balls will hit the ground at the same time.

1 kg = 2.2 lb

Mathematically, it works like this: Newton's second law relates the force on an object to its acceleration:

F = ma

By definition, mass is an object's resistance to acceleration. Now, weight is the force exerted by gravity. On the surface of the earth, the weight is:

W = mg

where g is a constant, g = 10 m/s^2.

So to compare kg to pounds, we should take gravity into consideration. Hence 1 kg becomes 10 N (Newton force).

Answer 3

Move the weight down, so that the pendulum is effectively longer. That will slow it down. Most good pendulum clocks have a little screw that will let you make this adjustment. The tennis ball with air only will reach terminal velocity first, because the terminal velocity is determined by friction of air and weight of the falling object. The heavier the object, for the same friction of air, will have the higher terminal velocity. Both balls will approximately accelerate at the same rate, so the lighter ball will reach its terminal velocity first.