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(A) concrete highway is built of slabs 11 m long (15 ∘C). How wide should the...

(A) concrete highway is built of slabs 11 m long (15 ∘C). How wide should the expansion cracks between the slabs be (at 15 ∘C) to prevent buckling if the range of temperature is -30∘C to +46 ∘C?

Express your answer to two significant figures and include the appropriate units.

(B) Calculate the rms speed of helium atoms near the surface of the Sun at a temperature of about 7000 K.

Express your answer to two significant figures and include the appropriate units.

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