Questions from College Physics

Q: A large clock has a second hand with a mass of 0

A large clock has a second hand with a mass of 0.10 kg concentrated at the tip of the pointer. (a) If the length of the second hand is 30.0 cm, what is its angular momentum? (b) The same clock has a...

Q: Five spheres are falling through the same viscous fluid, not necessarily

Five spheres are falling through the same viscous fluid, not necessarily at their terminal speeds. The radii r and speeds v of the spheres are given. Rank the spheres in order of decreasing viscous dr...

Q: A planet moves around the Sun in an elliptical orbit (see

A planet moves around the Sun in an elliptical orbit (see Fig. 8.40). (a) Show that the external torque acting on the planet about an axis through the Sun is zero. (b) Since the torque is zero, the p...

Q: What force(s) act on a parachutist descending to Earth

What force(s) act on a parachutist descending to Earth with a constant velocity? What is the acceleration of the parachutist?

Q: Two identical spheres are dropped into two different columns: one column

Two identical spheres are dropped into two different columns: one column contains a liquid of viscosity 0.5 Pa·s; the other contains a liquid of the same density but unknown viscosity. The sedimentati...

Q: You want to make a plot of the trajectory of a projectile

You want to make a plot of the trajectory of a projectile. That is, you want to make a plot of the height y of the projectile as a function of horizontal distance x. The projectile is launched from th...

Q: A merry-go-round (radius R, rotational inertia

A merry-go-round (radius R, rotational inertia Ii) spins with negligible friction. Its initial angular velocity is ωi. A child (mass m) on the merry-go-round moves from the center out to the rim. (a)...

Q: A sphere of radius 1.0 cm is dropped into a

A sphere of radius 1.0 cm is dropped into a glass cylinder filled with a viscous liquid. The mass of the sphere is 12.0 g, and the density of the liquid is 1200 kg/m3. The sphere reaches a terminal sp...

Q: A 68 kg woman stands straight with both feet flat on the

A 68 kg woman stands straight with both feet flat on the floor. Her center of gravity is a horizontal distance of 3.0 cm in front of a line that connects her two ankle joints. The Achilles tendon atta...

Q: An air bubble of 1.0 mm radius is rising in

An air bubble of 1.0 mm radius is rising in a container of vegetable oil with specific gravity 0.85 and viscosity 0.12 Pa·s. The container of oil and the air bubble are at 20°C. What is its terminal v...