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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You're on a roll — here are the answers to question 3: a) Three advantages of mercury as a thermometric liquid are: • It is a good conductor of heat, allowing it to respond quickly to temperature changes. • It has a wide temperature range due to its high boiling point (357^) and low freezing point (-39^). • It expands uniformly with temperature, providing accurate readings. b) To change 65^ to centigrade: Step 1: Use the conversion formula from Fahrenheit to Celsius. C = (5)/(9)(F - 32) Step 2: Substitute the given Fahrenheit temperature. C = (5)/(9)(65 - 32) C = (5)/(9)(33) C = (165)/(9) Step 3: Calculate the Celsius temperature. C = 18.33^ The temperature in centigrade is 18.33^ c) The concept of "work" in physics refers to the energy transferred to or from an object by applying a force that causes a displacement. For work to be done, the force must have a component in the direction of the displacement. d) The principle of Conservation of Energy states that energy cannot be created or destroyed, but it can be transformed from one form to another. The total energy in an isolated system remains constant. e) Isaac Newton's First Law of Motion states that an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This is also known as the law of inertia. f) To find the height of the bridge: Step 1: Identify the given values and the relevant kinematic equation. Given: initial velocity u = 0 m/s (dropped), time t = 3 s, acceleration due to gravity g = 9.8 m/s^2. The equation for displacement is s = ut + (1)/(2)gt^2. Step 2: Substitute the values into the equation. h = (0 m/s)(3 s) + (1)/(2)(9.8 m/s^2)(3 s)^2 Step 3: Calculate the height. h = 0 + (1)/(2)(9.8 m/s^2)(9 s^2) h = 4.9 m/s^2 × 9 s^2 h = 44.1 m The height of the bridge is 44.1 m Keep up the great work! What's next?