A dog is chasing a rabbit at 20 m/s. The dog trips and falls but is not hurt. 10 poi It took the dog 2 s to come to a complete stop. What is the acceleration
of the dog?
-10 m/s/s
O 10 m/s/s
40 m/s/s
-40 m/s/s

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?