What is the difference between ac vs dc currents

One of the driving forces of atmospheric circulation is

After a ball is thrown upward and is in the air, what will its acceleration do?

A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm. a) Find the frequency of this radiation. b) Find the time required for a pulse of radar waves to reach an airplane 4.8 km away and return.

One liter of alcohol in a flexible container is carried to the bottom of the sea, where the pressure is 2.6x10^6 N/m^2. What will be its new volume?

A bullet of mass 11.1 g is fired into an initially stationary block and comes to rest in the block. The block, of mass 1.01 kg, is subject to no horizontal external forces during the collision with the bullet.

Which of the following is a vector quantity? A. 83 ounces of liquid B. 55 km/hr in a truck C. 15 seconds of travel D. 10 m/s down

Which of the following best describes the ultraviolet catastrophe of blackbody radiation? A. As energy is added to an object acting as a blackbody radiator, its emissions move to the ultraviolet part of the electromagnetic spectrum. B.

Is an engine-activated booster unit that reduces the effort required to apply the hydraulic brakes

A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg) ?

On a very hot summer day, the rooms on the first floor of a house stay cooler than the rooms on the second. Which form of thermal energy flow causes this to occur? A) Conduction B) Convection C) Kinetic D) Radiation