In an experiment to find the specific latent heat of vapourization of stream, mass of calorimeter was 50g. The total mass of calorimeter and water was 300g. The initial temperature of the water in the calorimeter before stream was passed was 200C. The temperature increased to 600C after stream of total mass 16g was passed. Assuming the stream was at 1000C, estimate the value of latent heat of vapourization of stream. (Specific heat capacity of calorimeter = 400J/kgk, Specific heat capacity of water 4200J/kgk.

i guess it’s a and b

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