The sloshing of electrons inside a generator needs
A) an outside source of energy.
B) a copper lattice.
C) positive ions.
D) none of the above
Answer: A
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According to general relativity, why does Earth orbit the Sun?
A) Earth is following the straightest path possible through spacetime, but this path happens to go around and around the Sun. B) because the mysterious force that we call gravity holds the Earth in orbit C) because the Earth and Sun are connected by a "rope-like" set of invisible, subatomic particles D) Earth orbits the Sun because a spacetime diagram shows the Sun to be a bowl-shaped dip in a rubber sheet.
How much work is required to stretch an ideal spring of spring constant 40 N/m from x = 0.20 m to x = 0.25 m if the unstretched position is at x = 0.00 m?
A) 0.45 J B) 0.80 J C) 1.3 J D) 0.050 J
A particle (q = 3.0 mC, m = 20 g) has a speed of 20 m/s when it enters a region where the electric field has a constant magnitude of 80 N/C and a direction which is the same as the velocity of the particle. What is the speed of the particle 3.0 s after it enters this region?
a. 68 m/s b. 44 m/s c. 56 m/s d. 80 m/s e. 36 m/s
Why do astronomers believe that there is a large black hole, around 4 million times the mass of our Sun, in the Galactic center?
What will be an ideal response?