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Andre45 [30]
4 years ago
13

A crane at a construction site lifts a concrete block with a mass of m = 344 kg from the ground to the top of a building with a

height of h = 18.3 m. How much work did the motor of the crane do? (Assume zero energy loss in the lifting mechanism due to friction.)
Physics
1 answer:
Rama09 [41]4 years ago
6 0

Answer: Work that the motor of the crane do is 61122 joules.

Explanation:

Work is defined as the force resulting into displacement of an object.

w=m\times g\times h

w = work done

m= mass of object = 334 kg

g = acceleration due to gravity = 10ms^{-2}

h = height of an object  = 18.3 m

Putting in the values:

w=334\times 10ms^{-2}\times 18.3m=61122Joules

Thus work that the motor of the crane do is 61122 joules

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Question

A banked highway is designed for traffic moving at v 8 km/h. The radius of the curve = 330 m. 50% Part (a) Write an equation for the tangent of the highway's angle of banking. Give your equation in terms of the radius of curvature r, the intended speed of the turn v, and the acceleration due to gravity g

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Explanation:

Given

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Substituting the values of v,g and r

θ = tan-1(2.22²/(330 * 9.8)

θ = tan-1(0.001523933209647)

θ = 0.087314873580116°

θ = 0.087°

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