General Physics 3 Mock Exam 3

A soap bubble has an excess pressure of $10 \ Pa$ when its radius is $2 \ cm$. If the radius of the bubble is reduced to $1 \ cm$ (while maintaining the same surface tension), what will be the new excess pressure inside the bubble?

A metal wire of original length $2.0 \text{ m}$ and cross-sectional area $0.5 \text{ mm}^2$ is subjected to a tensile force of $100 \text{ N}$. If the wire extends by $1.0 \text{ mm}$, calculate the Young's Modulus of the material.

Calculate the excess pressure inside a spherical liquid drop of water with a radius of $0.5 \ mm$, given that the surface tension of water is $0.072 \ N/m$.

The pressure at a certain depth in a fluid is given by $P = \rho h g$. Which of the following statements is true regarding this formula?

Which of the following is NOT an example of a parameter normally chosen as a thermometric property?

A gas is heated to $40^\circ C$. Express this temperature in Kelvin.

Which of the following describes the phenomenon of adhesion?

A tank of volume $590 \text{ liters}$ contains oxygen at $20^\circ \text{C}$ and $5.0 \text{ atm}$ pressure. Calculate the mass of oxygen in the tank. (Molar mass of oxygen $O_2$ is $32 \text{ kg/kmol}$, Universal gas constant $R = 8.31 \text{ J mol}^{-1}\text{K}^{-1}$ or $8314 \text{ J kmol}^{-1}\text{K}^{-1}$)

The gauge pressure in a car tire is $305 \text{ kPa}$ when its temperature is $15^\circ \text{C}$. After running at high speed, the tire has heated up and its pressure is $360 \text{ kPa}$. What is then the temperature of the gas in the tire? Assume atmospheric pressure to be $101 \text{ kPa}$.

A heat engine receives $100 \text{ kJ}$ of heat from a hot reservoir and transfers $30 \text{ kJ}$ of heat to the cold surroundings. If a second engine operates with $20\%$ efficiency and receives the same amount of heat from its hot reservoir, how much more work does the first engine do compared to the second?