Questions from Modern Physics

Q: Does a rigid object in uniform rotation about a fixed axis satisfy

Does a rigid object in uniform rotation about a fixed axis satisfy the first and second conditions for equilibrium? Why? Does it then follow that every particle in this object is in equilibrium? Expla...

Q: Two identical masses are attached to frictionless pulleys by very light strings

Two identical masses are attached to frictionless pulleys by very light strings wrapped around the rim of the pulley and are released from rest. Both pulleys have the same mass and same diameter, but...

Q: You are designing a diving bell to withstand the pressure of seawater

You are designing a diving bell to withstand the pressure of seawater at a depth of 250 m. (a) What is the gauge pressure at this depth? (You can ignore changes in the density of the water with depth....

Q: If the force on the tympanic membrane (eardrum) increases by

If the force on the tympanic membrane (eardrum) increases by about 1.5 N above the force from atmospheric pressure, the membrane can be damaged. When you go scuba diving in the ocean, below what depth...

Q: The liquid in the open-tube manometer in Fig. 12

The liquid in the open-tube manometer in Fig. 12.8a is mercury, y1 = 3.00 cm, and y2 = 7.00 cm. Atmospheric pressure is 980 millibars. What is (a) the absolute pressure at the bottom of the U-shaped t...

Q: The lower end of a long plastic straw is immersed below the

The lower end of a long plastic straw is immersed below the surface of the water in a plastic cup. An average person sucking on the upper end of the straw can pull water into the straw to a vertical h...

Q: An electrical short cuts off all power to a submersible diving vehicle

An electrical short cuts off all power to a submersible diving vehicle when it is 30 m below the surface of the ocean. The crew must push out a hatch of area 0.75 m2 and weight 300 N on the bottom to...

Q: A cube 5.0 cm on each side is made of

A cube 5.0 cm on each side is made of a metal alloy. After you drill a cylindrical hole 2.0 cm in diameter all the way through and perpendicular to one face, you find that the cube weighs 6.30 N. (a)...

Q: A tall cylinder with a cross-sectional area 12.0

A tall cylinder with a cross-sectional area 12.0 cm2 is partially filled with mercury; the surface of the mercury is 8.00 cm above the bottom of the cylinder. Water is slowly poured in on top of the m...

Q: A cylindrical disk of wood weighing 45.0 N and having

A cylindrical disk of wood weighing 45.0 N and having a diameter of 30.0 cm floats on a cylinder of oil of density 0.850 g /cm3 (Fig. E12.21). The cylinder of oil is 75.0 cm deep and has a diameter th...