At what speed must an object be moving in order that it has a kinetic energy 2.50 times its rest energy? (c = 3.00 × 10^8 m/s)
a. 2.52 × 10^8 m/s
c. 2.75 × 10^8 m/s
b. 1.91 × 10^8 m/s
d. 2.87 × 10^8 m/s
D
You might also like to view...
Two equal charges of magnitude +1 C are separated by a distance of 1 km. What is the force acting between these two charges?
A) 0.9 N B) 9 N C) 90 N D) 900 N E) 9000 N
Why do scientists say that evolution is a "theory"?
A) because it explains a great deal about life and is supported by an enormous body of evidence B) because they are not very confident that it really happened C) because it's really just a guess about how life developed on Earth D) because it is supported by only a small amount of evidence
According to the selection rules, which of the following transitions is not allowed:
A) n = 3, ? = 2 to n = 2, ? = 1 B) n = 4, ? = 3 to n = 3, ? = 2 C) n = 3, ? = 1 to n = 1, ? = 0 D) n = 2, ? = 1 to n = 1, ? = 0 E) n = 4, ? = 2 to n = 3, ? = 2
The force needed to maintain a body at constant speed in outer space [far from all outside influences] is equal to
A) the mass of the body. B) the weight of the body. C) zero. D) the force required to stop it. E) None of the above.