Why doesn't a transformer work with direct current? why is ac required?

In a crash test, a 2,500 kg car hits a concrete barrier at 13 m/s2 calculate the amount of force at which the car strikes the barrier. The car strikes the barrier with a force of?

A body travels 80 meters in 8 seconds at a steady speed calculate it's average speed

Resonance occurs in the middle of the ear true of false

How many times bigger is the earth than the moon?

What is the weight, in pounds, of a 205-kg object on jupiter?

For resonance to occur, the object must experience a frequency equal to its what? amplitude period wavelength natural frequency

Rasheed runs a football 10 meters east, turns and runs the football 6 meters west. If his velocity during this run is found to be 3 meters/second, how long does this take Rasheed to complete this run?

What is the approximate weight of a 20-kg cannonball on the moon if the acceleration due to gravity is 1.6m/s^2

A man consumes 2245 kcal of food in one day, converting most of it to maintain body temperature. If he loses half this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate?

If an eagle and a bumblebee are traveling at 8km/hr which has more momentum?