When a four-megaton nuclear bomb is exploded, approximately 18 × 10^15 J of energy is released. How much mass would this represent in a mass-to-energy conversion? (c = 3.00 × 10^8 m/s)
a. 0.20 kg
c. 1.8× 103 kg
b. 18 kg
d. 0.050 kg
A
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A 750 N box rests on a floor with a coefficient of static friction = 0.800 and coefficient of kinetic friction = 0.600. What is the force of friction if a horizontal force of 550 N is applied to the box?
A. 600 N B. 450 N C. 750 N D. 550 N E. 440 N
When a positive charge is released and moves along an electric field line, it moves to a position of
a. lower potential and lower potential energy. b. lower potential and higher potential energy. c. higher potential and lower potential energy. d. higher potential and higher potential energy. e. greater magnitude of the electric field.
Why does Mars appear red from Earth's surface?
What will be an ideal response?
A motionless object could have
A) elastic energy. B) kinetic energy. C) speed. D) All of the above. E) None of the above.