Which statement describes how echolocation and ultrasound imaging are the same? a. they both use the absorption of sound waves. b. they both use the diffraction of sound waves. c. they both use the reflection of sound waves. d. they both use the transmission of sound waves.

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Eddy whose mass is 55kg climbs up the 1.50 meter high stairs in 2s. calculate eddy’s power rating

Acompound machine is also called a machine. a. force b. simple c. complex d. directional