A copper wire LM is fused at the end M to an iron wire MN. The copper wire has length 0.9m and cross-sectional area
0.9 x 106m2. The iron wire has length 1.4m and cross-sectional area
1.3 x 106m². When the compound wire is stretched, its total length
increases by 0.01m. Calculate:
(i) the ratio of the extensions of the two wires,
(ii) the extension of each wire,
(iii) the tension applied to the compound wire
235

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.

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

conservation of mass

mass before something happens = mass afterwards