PLEASE HELP SOLVE THIS PHOTO BELOW
2 answers:
You might be interested in
Answer:
(a) 37.5 kg
(b) 4
Explanation:
Force, F = 150 N
kinetic friction coefficient = 0.15
(a) acceleration, a = 2.53 m/s^2
According to the newton's second law
Net force = mass x acceleration
F - friction force = m a
150 - 0.15 x m g = m a
150 = m (2.53 + 0.15 x 9.8)
m = 37.5 kg
(b) As the block moves with the constant speed so the applied force becomes the friction force.
There are two different processes here:
1) we must add heat in order to bring the temperature of the water from
to 
(the temperature at which the water evaporates)
2) other heat must be added to make the water evaporates
1) The heat needed for process 1) is
where
is the water mass
is the water specific heat
is the variation of temperature of the water
If we plug the numbers into the equation, we find
2) The heat needed for process 2) is
where
is the water mass
is the latent heat of evaporation of water
If we plug the numbers into the equation, we find
So, the total heat needed for the whole process is
1) we must add heat in order to bring the temperature of the water from
2) other heat must be added to make the water evaporates
1) The heat needed for process 1) is
where
If we plug the numbers into the equation, we find
2) The heat needed for process 2) is
where
If we plug the numbers into the equation, we find
So, the total heat needed for the whole process is