Ice melts to form water. and water freezes to form ice. choose the true statement about these changes.
a. both melting and freezing are physical changes.
b. both melting and freezing are chemical changes.
c. melting is a physical change while freezing is a chemical change.
d. melting is a chemical change while freezing is a physical change.

The particles that are found in the nucleus of an atom are

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?