Guys help me with these physics questions?

Question

if a rubber bullet n a lead bullet of same momoentum are fired through a body.which will penetrate more n cause the death?

why its easier to balance a bicycle at rest than in motion?

if an unlit match is held near a hot bunsen flame(not touching)it,it doesnot burn.why?

Answer 1

rubber will cause more damage bcoz it will have more velocity and hence more kinetic energy

this is due to the fact that during motion ur body remains changing its position ...and weight on each side alternatively.

bcoz match needs fire to burn not heat

Answer 2

1) I'll skip as being unanswerable.

2) why its easier to balance a bicycle at rest than in motion?

The reverse is true, it is easier to balance in motion!

There are several things that keep a bike balanced

a) the angle of the front fork means that moving the font wheel L or R changes the balance point. You can sit perfectly still on a stationary bike and keep your balance by moving the handlebars.

b) by shifting your weight

c) the gyroscopic effect of a spinning wheel will keep the bike upright.

d) in motion, turning the handlebars causes the bike to turn, which causes your body and the bike to experience a force in the opposite direction, which can be used to balance you.

c) works only when in motion, and the faster the better.

d) works only when in motion

3) Not true, if you hold it there long enough, radiant heat will warm it up enough to ignite, if you hold it close enough.

Answer 3

Lead bullet becuase heavier and so will hae more kinetic energy.

A bike at rest and in motion will be exactly the same the balance.

Matches do not light with heat, will only light due to fire.