How many minerals are found in earths crust ?
2 answers:
You might be interested in
167.67 Joules of work are done by the gravitational force on the crate.
Force is defined as the product of the mass of the object and acceleration. The SI unit of the force of Newton.
Gravitational force is the force applied by gravity on an object. The gravity of the earth is 9.8 m/s².
Force = Mass × Acceleration
F = m × a
Mass of the crate = 10 kg
The initial speed of the crate = 1.50 m/s
The pulling force = 100 N
Horizontal angle made by the crate = 20 °
Coefficient of kinetic friction = 0.400
The crate is pulled to a height of 5 m.
Work done by the gravitational force on the crate is,
Work done by gravitational force = mass × gravity × height
Therefore, 167.67 Joules of work is done by the gravitational force on the crate.
To know more about force, refer to the below link:
#SPJ4
Answer:
(A) 0.63 J
(B) 0.15 m
Explanation:
length (L) = 0.75 m
mass (m) =0.42 kg
angular speed (ω) = 4 rad/s
To solve the questions (a) and (b) we first need to calculate the rotational inertia of the rod (I)
I = Ic + m
Ic is the rotational inertia of the rod about an axis passing trough its centre of mass and parallel to the rotational axis
h is the horizontal distance between the center of mass and the rotational axis of the rod
I = )^{2}[/tex]
I = )^{2}[/tex])
I = 0.07875 kg.m^{2}
(A) rods kinetic energy = 0.5I
= 0.5 x 0.07875 x = 0.63 J 0.15 m
(B) from the conservation of energy
initial kinetic energy + initial potential energy = final kinetic energy + final potential energy
Ki + Ui = Kf + Uf
at the maximum height velocity = 0 therefore final kinetic energy = 0
Ki + Ui = Uf
Ki = Uf - Ui
Ki = mg(H-h)
where (H-h) = rise in the center of mass
0.63 = 0.42 x 9.8 x (H-h)
(H-h) = 0.15 m