An ambulance is driving towards the hospital at a velocity 98.1 km/h and emitting a steady 841-Hz sound from its siren. The sound reflects off the front of the hospital and is received by the same ambulance. In addition to it's own siren, the ambulance hears a shifted tone from the reflection at what frequency

Agenerator converts mechanical energy to electrical energy. when a coil placed between two magnets rotates, the magnetic lines of force are disturbed. this induces a current in the coil. the image below shows a generator. what could be done to make the lamp brighter? a. decrease the size of the magnets b. turn the coil slower c. change the polarity of the magnets d. turn the coil faster

There are weak or strong attractive forces between atoms of liquids with a high viscosity

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative