A historical science: Scientists in many fields can test their hypotheses by proposing and carrying out experiments in which they can change variables in a controlled fashion
Astronomers, however, cannot adjust the properties of the objects they study. In what sense, then, can astronomers still conduct experiments?
Astronomers can see how well their ideas match existing data, and can make predictions for the outcome of future observations.
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The mass of an oxygen molecule is 16 times that of a hydrogen molecule. At room temperature, the ratio of the rms speed of an oxygen molecule to that of a hydrogen molecule is:
A. 16 B. 4 C. 1 D. 1/4 E. 1/16
Astronomers have not yet been able to detect planets outside our solar system
Indicate whether the statement is true or false
A constant-volume gas thermometer has a pressure of 2.00 atm at 100°C. What would its pressure be at 0°C?
a. 0.732 atm b. 1.46 atm c. 1.24 atm d. 1.37 atm e. More information is needed to find the answer.
A heat engine having an efficiency of 0.20 takes in 2000 J of energy from the hot reservoir in one cycle. In the same time, how much work will it perform?
A. 0 J B. 33,333 J C. 400 J D. 1000 J E. 120 J