Question

QUESTION 3 A uniform lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray is 0.11 kg On the tray is a 1 kg plate of food and a 0.28 kg cup of coffee Obtain the following force F-T Express your answer in Sl units with 3 or more significant figures 40 cm 38 cm 24 cm 10 cm 6 cm

Answer 1

ONE QUESTION AT A TIME PLEASE.............PLEASE ABIDE BY THE RULES.............

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Question 2

This is based on torque principle,

The net torque about an axis through the contact point between the tray and the thumb:

F * 0.04 = 0.28 * 9.8 * 0.32 + 1 * 9.8 * 0.18 + 0.11 * 9.8 * 0.14

solve for F, we get

F = 69.825 N (upwards)

Now, to find T

the net torque about an axis through the point of contact between the tray and the finger:

T * 0.04 = 0.28 * 9.8 * 0.28 + 1 * 9.8 * 0.14 + 0.11 * 9.8 * 0.10

T = 56.2 N (downwards)

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