Zeros the left of the decimal but still less than one are non significant but to the right they are.
For example: 0.003 (only 3 is significant) but for 0.030 (two are significant)
Answer:
a) 1.67 m/s
b) 23kJ
Explanation:
We need to apply the linear momentum conservation formula, that states:

in this case:

the initital kinetic energy is:

and the final:

The energy lost is given by:

Answer:
the rate of acceleration of the train is 4 m/s²
Explanation:
Given;
initial velocity of the train, u = 10 m/s
change in time of motion, dt = 5 s
final velocity of the train, v = 30 m/s
The rate of acceleration of the train is calculated as;

Therefore, the rate of acceleration of the train is 4 m/s²
Answer:920.31 J
Explanation:
Given
Volume of water (V)
mass(m)
Temperature 
Final Temperature 
specific heat of water(c)
Therefore heat required to removed is


