Questions from College Physics

Q: A sphygmomanometer is a device used to measure blood pressure, typically

A sphygmomanometer is a device used to measure blood pressure, typically consisting of an inflatable cuff and a manometer used to measure air pressure in the cuff. In a mercury sphygmomanometer, blood...

Q: Piston ➀ in Figure P9.16 has a diameter of 0

Piston ➀ in Figure P9.16 has a diameter of 0.25 in.; piston ➁ has a diameter of 1.5 in. In the absence of friction, determine the force F( necessary to support the...

Q: A table-tennis ball has a diameter of 3.80

A table-tennis ball has a diameter of 3.80 cm and average density of 0.0840 g/cm3. What force is required to hold it completely submerged under water?

Q: A 20.0-kg lead mass rests on the bottom

A 20.0-kg lead mass rests on the bottom of a pool. (a) What is the volume of the lead? (b) What buoyant force acts on the lead? (c) Find the lead’s weight. (d) What is the normal force acting on the l...

Q: A small ferryboat is 4.00 m wide and 6.

A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, the boat sinks an additional 4.00 cm into the river. What is the weight of the truck?

Q: A 62.0-kg survivor of a cruise line disaster

A 62.0-kg survivor of a cruise line disaster rests atop a block of Styrofoam insulation, using it as a raft. The Styrofoam has dimensions 2.00 m x 2.00 m x 0.0900 m. The bottom 0.024 m of the raft is...

Q: Two spheres are made of the same metal and have the same

Two spheres are made of the same metal and have the same radius, but one is hollow and the other is solid. The spheres are taken through the same temperature increase. Which sphere expands more? (a) S...

Q: A hot-air balloon consists of a basket hanging beneath a

A hot-air balloon consists of a basket hanging beneath a large envelope filled with hot air. A typical hot-air balloon has a total mass of 545 kg, including passengers in its basket, and holds 2.55 x...

Q: A large balloon of mass 226 kg is filled with helium gas

A large balloon of mass 226 kg is filled with helium gas until its volume is 325 m3. Assume the density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3. (a) Draw a force diagram for the...

Q: A spherical weather balloon is filled with hydrogen until its radius is

A spherical weather balloon is filled with hydrogen until its radius is 3.00 m. Its total mass including the instruments it carries is 15.0 kg. (a) Find the buoyant force acting on the balloon, assumi...