Jovember 2010 P Р
QUESTION 4 (Start on a new page.)
A bullet moves east at a velocity of 480 m-
st hits a wooden block that is fixed to the
floor. The bullet takes 0.01 s to move through the stationary block and emerges from
the block at a velocity of 80 ms east. See the diagram below.
Ignore the effects of air resistance.
Consider the block-bullet system as an isolated system.
480 ms
80 m. si
w
Fixed wooden block
Explain what is meant by an isolated system as used in Physics.
The magnitude of the momentum of the bullet before it enters the block is 24 kg m s.
4.2
Calculate the
42.1
Mass of the bullet
(3)
4.22
Average net force exerted by the wooden block on the bullet​

hope this helps

Explanation:

b is the answer

c. rb

explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s