When water evaporates of your body it cools you down, hence why after a shower when the water droplets begin to evaporate you feel cold
Answer:
a. acceleration (a) = 4.9 m/s²
b.
c. see the attached diagram below
d V = 0.048 m/s
e. The viscosity u = 0.27 Ns/m²
Explanation:
Given that :
m = 5 kg
A = ( 0.1 m )²
d = 0.20 mm
θ = 30 °
By applying Newton's second Law ; we have
F = mgsinθ - (since no friction ; then
ma = mg sinθ
a = gsin θ
a = 9.8 × sin 30
a = 4.9 m/s²
b) By applying Newton's second law at any instant .
ma = mgsin θ -
and = T×A = -
Also; ma =
∴ ma = mg sin θ -
separating the variables ; we have
By integrating using limits ; we have:
∴
c) The curve for V(t) plot is attached in the diagram below.
d)
To find the speed after 1 sec; we have:
at t = 1.0 sec;
V =
V = 0.048 m/s
e) In order to determine the viscosity for which V(0.1) = 0.3 m/s ; we have the following.
∴
The viscosity u = 0.27 Ns/m²
I believe the answer would be A) Centripetal force.
Let the moving object be object 1 and the stationary object be object 2.
Momentum of object 1 before collision = 55 kg*m/s
Momentum of object 2 before collision = 0 kg*m/s
Momentum of object 1 after collision = 13 kg*m/s
According to the law of conservation of momentum, the sum of the momenta of 2 objects remains the same even after collision. So,
Momentum of object 1 before collision + momentum of object 2 before collision = Momentum of object 1 after collision + momentum of object 2 after collision
55 + 0 = 13 + momentum of object 2 after collision
Momentum of object 2 after collision = 55 - 13 = 42 kg*m/s
Hope I helped!