This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
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Hey bilgate, good to see you again. Here are the solutions for the questions from the image: 2. Figure 2 shows a uniform plank of negligible mass and of length 2 m, on a support, A, at its midpoint. Two weights of 60 N and 80 N are attached to it. 2. (a) State two conditions necessary for the system to be in equilibrium. • The net force acting on the system must be zero (translational equilibrium). • The net moment (torque) about any point must be zero (rotational equilibrium). 2. (b) Calculate: (i) The distance, x, of the 80 N object from the support when the system is in equilibrium. Step 1: Apply the principle of moments about the support A. For equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments. The 60 N weight is at one end of the 2 m plank, and the support is at the midpoint. So, the distance of the 60 N weight from the support is 2 m / 2 = 1 m. Anticlockwise moment = 60 N × 1 m Clockwise moment = 80 N × x Step 2: Set moments equal and solve for x. 60 N × 1 m = 80 N × x 60 N m = 80x N m x = (60)/(80) m x = 0.75 m The distance, x, is 0.75 m. (ii) The force, R, on the plank by the support. Step 1: Apply the condition for translational equilibrium. For equilibrium, the sum of upward forces equals the sum of downward forces. Upward force = R Downward forces = 60 N + 80 N Step 2: Set forces equal and solve for R. R = 60 N + 80 N R = 140 N The force, R, on the plank by the support is 140 N. 3. (a) (i) Define interference. Interference is the superposition of two or more waves that results in a new wave pattern, where the amplitudes of the waves either add up or cancel out. (ii) Name the two types of interference. • Constructive interference • Destructive interference (iii) Explain what happens to the resultant amplitude of each type named in (ii) above. • In constructive interference, the waves are in phase, and their amplitudes add up, resulting in a larger resultant amplitude. • In destructive interference, the waves are out of phase (180 degrees), and their amplitudes subtract, resulting in a smaller or zero resultant amplitude. Drop the next question! 📸