What is buoyancy?
What will be an ideal response?
Buoyancy is the force acting on a body submerged in a fluid which acts to move
the body against gravity and the body’s weight. It can be visualized as the sum
of the surface forces acting on the body due to the pressure of the fluid.
You might also like to view...
A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is
a. 0 b. 2 m/s2. c. 4 m/s2. d. 5 m/s2. e. 7.5 m/s2.
A neutron has a mass of 1.67 × 10^?27 kg. Its de Broglie wavelength is 1.4 × 10^?10 m. What is its kinetic energy (in eV)?
a. 4 b. 0.4 c. 0.04 d. 40 e. 0.08
A boy fires a spring-loaded Ping-Pong ball gun. Briefly compare the forces and impulses on the gun and the ball. Which has more momentum? Which moves faster?
What will be an ideal response?
The dynamic random access memory (DRAM) in computers is produced by oxidizing a silicon wafer to produce a capacitor with SiO2 as the dielectric, and the memory corresponds to the charge stored on the capacitor. Assume that the thickness of the dielectric is 1×10-6 m, the plates of the capacitor are square with an edge length of 10×10-6 m, the dielectric constant or relative permeability of SiO2 is 4, and the applied voltage is 10 V.
(a) What is the capacitance? (b) What total charge is stored in this capacitor? (c) What is the charge density on the capacitor plates? (d) What is the polarization of the SiO2 in the capacitor?