Which statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0? (1 point)
O The substance with the higher pH has 1,000 times as many hydrogen ions per volume of water.
O The substance with the higher pH has twice as many hydrogen ions per volume of water.
O The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.
O The substance with the lower pH has twice as many hydrogen ions per volume of water.

Rocío strikes a 0.058-kg golf ball with a force of 272n and gives it a velocity of 62.0m/s. how long was ricío club in contact with the ball?

Which of the following represents an upside-down image? o a. +doo b. -doo c. +mo d.-m

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)