Concrete is sold by the cubic yard. What is the mass, in kilograms, of one cubic yard of concrete that is five times as dense as water? (1 m = 1.094 yd, and 1 m3 of water has a mass of 1,000 kg.)
A) 764 kg
B) 6546 kg
C) 2420 kg
D) 8733 kg
E) 3819 kg
E
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What type of heat transfer is used to carry heat from the house furnace to the living room of most houses?
A. natural convection of air falling over the cooling land B. forced convection air or force convection of water C. forced convection of water D. natural convection of air rising over the warming land
Consider an experiment where we send monochromatic light to a distant screen through a single narrow slit. The distance between adjacent dark fringes in the diffraction pattern displayed on the screen (A) increases, (B) decreases, or (C) remains the same if, The distance between the slit and the screen increases.
A. Increases B. Decreases C. Remains the same
What key event happened during the decoupling epoch?
A) Pairs of neutrons and protons were created. B) Electrons and positrons were created. C) Expansion cooled the universe enough that protons could capture electrons in orbit. D) Dark energy accelerated the cosmos on to infinity. E) The universe underwent a brief period of very rapid expansion.
The electronvolt is the unit of energy very well suited to describing energies of nucleons and electrons at the atomic level
What will be an ideal response?