A transformer with 600 turns on the primary and 1200 turns on the secondary receives 400v is the output voltage is 60v, calculate efficiency of the transformer. ​

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?