An electron has a relativistic momentum of 1.1 × 10-21 kg-m/s. What fraction of its total energy is its kinetic energy?
What will be an ideal response?
0.75
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What is the mass of the black hole believed to be at the center of the Milky Way? How do we know?
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In a certain nuclear reactor, neutrons suddenly collide with deuterons, which have twice the mass of neutrons
In a head-on elastic collision with a stationary deuteron, what fraction of the initial kinetic energy of a neutron is transferred to the deuteron? A) 1/2 B) 1/3 C) 3/4 D) 5/6 E) 8/9
An object attached to a spring undergoes SHM. When the object is at its maximum distance from the equilibrium position, which of the following statements are true? (There could be more than one correct choice.)
A) The object's acceleration is zero. B) The object's speed is zero. C) The elastic potential energy of the system object-spring is zero. D) The kinetic energy of the system object-spring is a maximum. E) The total mechanical energy of the system object-spring is zero.
Why might astronomers someday establish an observatory on the Moon?
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