A lost bat flies forward and backward. Its motion is shown on the following graph of horizontal position : vs. time t.
(m)
2+
→ t(s)
12
2
4
6
8
10
Pro
Tea
What is the instantaneous velocity of the bat att = 55?
2 of 4

=force × distance a. work b. velocity c. pressure d. momentum

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.

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.