Suppose there are 2 moles of a gas in a container of fixed size and the average spacing of molecules in the container is 4.0 nm. If an additional 14 moles of the gas are added to the container and thermal equilibrium is established, what is the new average spacing of the molecules?
a. 2.0 nm
c. 1.4 nm
b. 0.50 nm
d. 2.8 nm
A
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A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
A. ?14 J B. ?12 J C. ?10 J D. ?16 J E. ?25 J
Isaac Newton was able to estimate a value for G, the universal gravitational constant, from the following data: the radius of the Earth is about 6 400 km, the average density of rocks is about 5.50 g/cm3, and g = 9.80 m/s2 near the surface of the Earth. What value did Newton obtain for G?
Considering only the role of dark energy and keeping all other factors the same, which hypothetical universe is oldest?
A) the one with more dark energy B) the one with less dark energy C) Dark energy doesn't affect the inferred age of the universe.
Gauss's Law: The figure shows four Gaussian surfaces surrounding a distribution of charges.(a) Which Gaussian surfaces have an electric flux of +q/?o through them?(b) Which Gaussian surfaces have no electric flux through them?
What will be an ideal response?