If a motor unit is stimulated to contract in order to generate movement and no movement happens, which muscular concept indicated the addition of more motor units to increase tension

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?

Think you could get me the answers ?