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.

Physics & Space Science

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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

Physics & Space Science

Astronomers have not yet been able to detect planets outside our solar system

Indicate whether the statement is true or false

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science