Seriously need with these.. ! 30+ i will mark

a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. what is the height of the image formed by the mirror?

4.63

18.5

2.45

9.26

a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. what is the magnitude of the image distance?

22.7

9.26

24.5

11.4

you move away from a plane mirror at a speed of 1.60 m/s. at what speed does your image move away from you?

1.60 m/s

3.20m/s

6.40m/s

0.40m/s

Stars x and y are both bluish main sequence stars. star x has a higher absolute brightness than star y. how do the two stars compare? explain

Which of the following are appropriate acceleration units?

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)