a) A rigid, uniform rod has a length L and a weight of 200 N. An object weighing 300 N h from the left end of the rod, and another object weighing 400 N hangs from the s end. L 3L Calculate: i) the magnitude of the force exerted on the rod that will cause the rod to be in equ rium;

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Chapter1: Units, Trigonometry. And Vectors
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Question B2
a) A rigid, uniform rod has a length L and a weight of 200 N. An object weighing 300 N hangs
from the left end of the rod, and another object weighing 400 N hangs from the same
end.
Calculate:
i) the magnitude of the force exerted on the rod that will cause the rod to be in equilib-
rium;
ii) and its distance from the left end of the rod.
b) i) An object of mass m is travelling with a constant speed v when it speeds up with a
constant acceleration. Calculate its speed when its kinetic energy is doubled.
ii) An object of mass m travelling with a constant speed v slows down with a constant
acceleration. Calculate its change in kinetic energy when the speed is reduced by
half.
c) A rock dropped straight down from a cliff covers one-third of its total distance to the ground
in the last second of its fall.
Calculate the height of the cliff from the ground. Air resistance is negligible.
Transcribed Image Text:Question B2 a) A rigid, uniform rod has a length L and a weight of 200 N. An object weighing 300 N hangs from the left end of the rod, and another object weighing 400 N hangs from the same end. Calculate: i) the magnitude of the force exerted on the rod that will cause the rod to be in equilib- rium; ii) and its distance from the left end of the rod. b) i) An object of mass m is travelling with a constant speed v when it speeds up with a constant acceleration. Calculate its speed when its kinetic energy is doubled. ii) An object of mass m travelling with a constant speed v slows down with a constant acceleration. Calculate its change in kinetic energy when the speed is reduced by half. c) A rock dropped straight down from a cliff covers one-third of its total distance to the ground in the last second of its fall. Calculate the height of the cliff from the ground. Air resistance is negligible.
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