Author Question: An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s2. How much ... (Read 175 times)

dmcintosh · **on:** Jul 27, 2018

An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s2. How much time does it take for the complete increase in speed?

A) 0.25 s
B) 4.0 s
C) 0.0577 s
D) 17.3 s
E) 8.0 s

Question 2

It is a well-known fact that water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30. calories, is added to each.

Which statement is true? A) They remain in thermal equilibrium.
B) They are no longer in thermal equilibrium; the iron is warmer.
C) They are no longer in thermal equilibrium; the water is warmer.
D) It is impossible to say without knowing the exact mass involved and the exact specific heat capacities.