Question 2 of 10 Which statement describes a controlled experiment?
A. It includes two groups, both of which are exposed to the factor
being tested.
B. It includes a group exposed to the factor being tested and a group
that is not exposed to the factor being tested.
C. It includes a group exposed to one of the factors being tested and
a group that is exposed to another of the factors being tested.
O D. It includes two groups, neither of which is exposed to the factor
being tested

Write a question about how changing temperature affects the gas inside the sports ball

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

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)