Answer the following questions about heat, temperature, and motion: a) Three advantages of mercury as a thermometric liquid. b) Convert 65F to Celsius. c) Define 'work' in physics. d) State the princi

The temperature in centigrade is $\boxed{\text{}18.33^\circ\text{C}\text{}}$

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.

Given: initial velocity $u = 0 \text{ m/s}$ (dropped), time $t = 3 \text{ s}$, acceleration due to gravity $g = 9.8 \text{ m/s}^2$.
The equation for displacement is $s = ut + \frac{1}{2}gt^2$.

The height of the bridge is $\boxed{\text{}44.1 \text{ m}\text{}}$