Note the expression: y = A/x3 . Which statement is most consistent with this expression?
a. y is less than A.
b. If x is halved, y is multiplied by eight.
c. If x is doubled, y is multiplied by a factor of 8.
d. y is greater than x.
b
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When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
a. mgdy. b. mgnVdy. c. mgAdy. d. mgnVAdy. e. mgnVAPdy.
In interactions taking place by the strong force, which of the following quantities are conserved?
a. electric charge b. baryon number c. mass-energy d. strangeness e. linear momentum f. angular momentum (spin)
The greenhouse effect occurs on Earth because carbon dioxide is
a. transparent to visible light and opaque to infrared radiation. b. opaque to visible light and transparent to infrared radiation. c. totally opaque to both visible light and infrared radiation. d. totally opaque to both visible light and infrared radiation.
State Newton's second law in terms of momentum
What will be an ideal response?