The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a few hundred thousand years ago.
B) 3 days ago.
C) 100 years ago.
D) 1,000 years ago.
A) a few hundred thousand years ago.
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The "bottom-up" approach to creating artificial life starts
A) with simple bacteria and attempts to add DNA sequences to them to make them more complex B) with advanced robots and attempts to make them able to reproduce C) in the laboratory with the raw ingredients of life, and seeks to reproduce life in much the same way that it presumably originated billions of years ago D) with existing organisms and genetically strips them down, then tries to rebuild them into new species
A circular steel rod 0.005 m in radius and 4.000 m long is subject to an axial force of 0.250 × 105 newtons. We observe that the rod elongates 0.616 × 10-2 m. Calculate the tensile stress and the axial strain in the rod.
What will be an ideal response?
Isotopes of an element have the same number of ________ but different numbers of _______.
A. neutrons, protons B. electrons, protons C. protons, neutrons D. neutrons, electrons E. protons, electrons
A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following are negative?
a. the speed of the car c. the average acceleration of the car b. the average velocity of the car d. all of the above