7. A ball is traveling at a constant speed (v) of 30.0 m/s in a circle with a radius (r) of 5.0 m.
(Hint: The circumference C = 2hr)
7.1
The centripetal acceleration is ZERO
a. False
b. True
7.2
The total distance traveled by the ball is:
7.3
How long in time does it take for the ball complete one circle?
7.4
The displacement traveled by the ball is:
7.5
The average velocity of the ball is:
7.6
The average speed of the ball is:

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)