explain briefly why a kitchen knife is sharp in order to cut a piece of yam easily. A force of 10 Newton is exerted on a piece of yam using a knife of cross-sectional area 1x10^-5 m2. Determine the pressure exerted. State 3 applications of pressure.

Here are the solutions to your physics questions: 1. A kitchen knife is sharpened to cut a piece of yam easily because a sharp edge has a very small surface area. When a force is applied to this small area, it creates a high pressure on the yam. This high pressure allows the knife to penetrate and cut through the yam with less effort. 2. To determine the pressure exerted: Step 1: Identify the given values and the formula for pressure. Given: Force (F) = 10 N Cross-sectional area (A) = 1 × 10^-5 m^2 The formula for pressure is: P = (F)/(A) Step 2: Substitute the given values into the formula. P = 10 N1 × 10^-5 m^2 Step 3: Calculate the pressure. P = 10 × 10^5 Pa P = 1,000,000 Pa P = 1 × 10^6 Pa The pressure exerted is 1 × 10^6 Pa. 3. Here are three applications of pressure: • Syringes use pressure to inject liquids into the body or draw fluids out. • Hydraulic brakes in vehicles use fluid pressure to transmit force and stop the car. • Sharp tools like knives, axes, and needles are designed with small contact areas to exert high pressure for cutting or piercing. Drop the next question!