Objects that are able to roll have what type of energy? A. potential
B. mechanical
C. thermal
D. chemical

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m