The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model(s) predict(s) that galaxies are getting farther apart NOW?
A) accelerating
B) coasting
C) critical
D) recollapsing
E) all of them
E) all of them
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A proton's rest mass is 1.67 × 10^?27 kg. Calculate its total energy when it is accelerated to a speed of 0.80c
a. 1.5 × 10^?10 J b. 1.0 × 10^?10 J c. 2.5 × 10^?10 J d. 2.0 × 10^?10 J e. 7.5 × 10^?10 J
How many protons does Tc have?
a. 93 b. 58 c. 48 d. 107 e. 43
Discuss the pros and cons of organic farming to the best of your knowledge
What will be an ideal response?
Waves are altered when they enter shallow water. They change
A) direction by refraction, they steepen and break. B) direction by refraction, they increase in speed, steepen, and break. C) direction by reflection, they increase in energy, steepen, and break. D) intensity by refraction, they lose energy, steepen and break.