A small sphere of initial volume V is filled with n moles of helium at initial pressure and temperature P and T. Which of the following statements is true?
Using the ideal gas law PV = nRT, you can expect a pressure drop to P/2.
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A steel cable spanning a river is 200.000 m long when the temperature is 20.°C. What will be its length when the temperature drops to 0°C? (The coefficient of thermal expansion of steel is 12. × 10-6K-1.)
What will be an ideal response?
An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image position (in cm)?
a. ?8 b. ?4 c. ?2 d. ?6 e. 30
Gravity acts over a limited distance range
Indicate whether the statement is true or false
Kepler used Tycho's observations to show that the planets
a. followed perfectly circular orbits. b. followed perfectly cubical orbits. c. all circled the Earth. d. followed elliptical orbits.