Whay is difference between ac and dc

A boy sits on the edge of a stationary merry-go-round. His dog runs along the ground and jumps into his arms in such a way that the merry-go-round starts to spin. After the dog has landed and the merry-go-round is spinning,

A 55 newton force applied on an object moves the object 10 meters in the same direction as the force. What is the value of work done on the object? A. 0 joules B. 5.5 joules C. -5.5 joules D. 5.5 * 102 joules E. -5.5 * 102 joules

A wheel that was initially spinning is accelerated at a constant angular acceleration of 5.0 rad/s^2. After 8.0 s, the wheel is found to have made an angular displacement of 400 radians.

What device can be used to remove toxic pollutants from power plant emissions? a. catalytic converters c. bioreactors b. scrubbers d. mufflers

What makes it possible for us to see the moon from earth? A. Light from earth shines on the moon's surface, making it bright. B. The moon absorbs light during the day and reflects that same light back at night. C.

X-rays UV light waves Sound waves Earthquake waves. All of these have which characteristic in common?

V=345m/s, 7210Hz, X=?

As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. Determine the energy of the absorbed photon in electronvolts.

During an exothermic reaction, the energy given off comes from atoms being consumed mass being burned into energy the breaking and forming of bonds mass being created

Can electrostatic attract both pull and pull?