Answer:
C - 11.76 N (Newtons)
Explanation:
2 steps are needed,
First find the Force being applied by the box on the surface.
F = M(a) [Force equals: mass X Acceleration (of gravity)]
You get 39.2 N of Force.
Plug in the remaining values into the equation for Frictional Force
F(f) = μ(F) [Coefficient of Friction X Force applied by the Box]
So
F(f) = 0.3(39.2) = 11.76 N (of Frictional Force)
The problem involves the conversion of potential energy to kinetic energy as the object falls from rest. Energy is conserved, so the equation used is:
PEi + KEi = PEf + KEf
Since the object is falling from rest, the initial kinetic energy is zero. Also, since the object hits the ground at its final position, the final potential energy is zero. This leaves:
PEi = KEf
mgh = 1/2 mv^2
*cancel out mass on both sides of the equation
gh = 0.5v^2
v = sqrt(2gh) = sqrt(2*9.81*4.5) = 9.40 m/s --> final ans.
an unexpected visitor as it begins making you feel uncomfortable but it's get calm
Answer:
a) The speed is 61.42 m/s
b) The drag force is 10.32 N
Explanation:
a) The Reynold´s number for the model and prototype is:


Equaling both Reynold's number:

Clearing Vm:

b) The drag force is:

Answer:

Explanation:
From the question we are told that:
Speed of light 
Generally the equation for Average Speed is mathematically given by

Where
d=Distance between the Earth and the sun

Therefore



Since m and n is given in the form of

Therefore

