A large drill is used to make a hole through rocks in the earths surface to excavate for oil
1 answer:
Answer:
Explanation:
The gravitational potential energy of an object is the energy possessed by the object due to its location in the gravitational field.
This energy is always measured as a difference with respect a "zero level" - generally taken as the ground level.
Therefore, it generally makes more sense to measure the change in gravitational potential energy of an object when its height is changed; this is given by:
where:
m is the mass of the object
is the acceleration due to gravity
is the change in height of the object
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Answer:
x = 0.176 m
Explanation:
For this exercise we will take the condition of rotational equilibrium, where the reference system is located on the far left and the wire on the far right. We assume that counterclockwise turns are positive.
Let's use trigonometry to decompose the tension
sin 60 = / T
T_{y} = T sin 60
cos 60 = Tₓ / T
Tₓ = T cos 60
we apply the equation
∑ τ = 0
-W L / 2 - w x + T_{y} L = 0
the length of the bar is L = 6m
-Mg 6/2 - m g x + T sin 60 6 = 0
x = (6 T sin 60 - 3 M g) / mg
let's calculate
let's use the maximum tension that resists the cable T = 900 N
x = (6 900 sin 60 - 3 200 9.8) / (700 9.8)
x = (4676 - 5880) / 6860
x = - 0.176 m
Therefore the block can be up to 0.176m to keep the system in balance.