By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding?
a) all galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going
b) all galaxies outside the Local Group are moving away from us, and all are moving away nearly the same speed
c) all galaxies contain billions of star and all galaxies have spiral shapes
a) all galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going
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Process of Science: If there is a particularly cold winter in Minnesota one year, does this mean that global warming is wrong, or has ended?
What will be an ideal response?
Food is cooked faster in a pressure cooker due to its
A) greater rate of bubble formation in the water. B) higher thermal energy. C) higher temperature. D) none of the above
If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many hydrogen atoms would you need to equal the mass of four helium atoms?
A) 16 B) 4 C) 1/4 D) 25 E) 6.022 × 1023
An analog ammeter able to have a 0.5 A maximum reading is to be built using a small coil of resistance R = 20 ?, and full scale deflection at 1 mA. What resistance should be added to this coil and how should it be connected to the coil?
A) 0.08 ? in parallel B) 0.5 ? in parallel C) 0.02 ? in series D) 20.4 ? in parallel E) 0.04 ? in parallel