Answer:
Coefficient of friction between the book and floor is 0.582.
Explanation:
Using the velocity formula;
v^2 = 2as
a = v^2/(2s)
a = 1.6^2/(2*0.9)
a = 2.56/1.8
a = 1.42 m/s^2
the force necessary to give the book the acceleration is
F = ma = 3.5*1.42 (m is mass of the book i.e. 3.5 kg)
F = 4.98 N
The difference in the force is the friction force, which is
Ff = 25 - 4.98 = 20 N
Ff = mgμ
where μ is coefficient of friction and g is acceleration due to gravity that is 9.8 m/s^2
μ = Ff/mg
μ = 20/(3.5*9.81)
μ = 0.582
Coefficient of friction between the book and floor is 0.582.
Full moon!
when Earth is exactly between the Moon and Sun, Earth's shadow falls upon the surface of the Moon, dimming it and sometimes turning the surface red over the course of a few hours.
Answer:
Acceleration(a)=3m/s^2
Time(t)=1min[1min=60s]
=1×60
=60s
Initial velocity(u)=0m/s
Velocity(v)=?
We know that,
Acceleration=v-u/t
Or,3m/s^2=v-0/60
Or,3×60=v-0
Or,v=180m/s
So,the velocity is 180m/s.
Hope,it will helpyouu!
The equation for kinetic energy is
E = 1/2 m v^2
Isolating for the speed gives us
v = sqrt(2E/m),
that is the square root of 2 times the energy divided by the mass.
This gives us a speed of
v = 8.5 m/s
So the answer is C.
Conditions for equilibrium require that the sum of all external forces acting on the body is zero (first condition of equilibrium), and the sum of all external torques from external forces is zero (second condition of equilibrium). These two conditions must be simultaneously satisfied in equilibrium.