Questions from Modern Physics

Q: The atmosphere of the planet Mars is 95.3% carbon

The atmosphere of the planet Mars is 95.3% carbon dioxide (CO2) and about 0.03% water vapor. The atmospheric pressure is only about 600 Pa, and the surface temperature varies from -300C to -1000C. T...

Q: A beaker of water at room temperature is placed in an enclosure

A beaker of water at room temperature is placed in an enclosure, and the air pressure in the enclosure is slowly reduced. When the air pressure is reduced sufficiently, the water begins to boil. The t...

Q: A rigid, perfectly insulated container has a membrane dividing its volume

A rigid, perfectly insulated container has a membrane dividing its volume in half. One side contains a gas at an absolute temperature T0 and pressure p0, while the other half is completely empty. Sudd...

Q: A baby’s mouth is 30 cm from her father’s ear and 1

A baby’s mouth is 30 cm from her father’s ear and 1.50 m from her mother’s ear. What is the difference between the sound intensity levels heard by the father and by the mother?

Q: (a). Which has more atoms: a kilogram of hydrogen

(a). Which has more atoms: a kilogram of hydrogen or a kilogram of lead? Which has more mass? (b). Which has more atoms: a mole of hydrogen or a mole of lead? Which has more mass? Explain your reason...

Q: Figure P16.75 shows the pressure fluctuation p of a nonsinusoidal

Figure P16.75 shows the pressure fluctuation p of a nonsinusoidal sound wave as a function of x for t = 0. The wave is traveling in the +x-direction. (a). Graph the pressure fluctuation p as a functi...

Q: A long spring such as a Slinky™ is often used to

A long spring such as a Slinky™ is often used to demonstrate longitudinal waves. (a). Show that if a spring that obeys Hooke’s law has mass m, length L, and force constant k′ the speed of longitudina...

Q: The dark area in Fig. P18.83 that appears devoid

The dark area in Fig. P18.83 that appears devoid of stars is a dark nebula, a cold gas cloud in interstellar space that contains enough material to block out light from the stars behind it. A typical...

Q: Consider a poor lost soul walking at 5 km/h on

Consider a poor lost soul walking at 5 km/h on a hot day in the desert, wearing only a bathing suit. This person’s skin temperature tends to rise due to four mechanisms: (i) energy is generated by met...

Q: A hollow cylinder has length L, inner radius a, and

A hollow cylinder has length L, inner radius a, and outer radius b, and the temperatures at the inner and outer surfaces are T2 and T1. (The cylinder could represent an insulated hot-water pipe.) The...