Which of these is the easiest way to do 20 newton meters of work?
A. Applying 20 newtons of force over a distance of 1 meter.
B. Applying 2 newtons of force over a distance of 10 meters.
C. Applying 4 newtons of force over a distance of 10 meters.

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

Daughter element the new element produced along with a decay particle in a nuclear transmutation 2. half-life the substance that decays in a nuclear transmutation 3. parent element the change of one chemical element into another by nuclear decay or radioactive bombardment 4. transmutation the time required for the decay of one-half of the atoms in a sample of radioactive material

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.