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.
A) Earth is following the straightest path possible through spacetime, but this path happens to go around and around the Sun.
You might also like to view...
A man is holding an 8.00-kg vacuum cleaner at arm's length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is held at 30.0° below the horizontal?
A) 21.6 Nm B) 2.20 Nm C) 4.40 Nm D) 12.6 Nm E) 37.4 Nm
From Earth, due to their motions and the fact that the Sun lights only a portion of each surface, both Mercury and the Moon:
A) always look full from Earth. B) appear to go through phases. C) pass through Earth's shadow. D) appear to be half-lit by the Sun. E) always have the same side facing Earth.
Assume that the tile vectors for tiles on the surface shown below point toward us. What is the sign of the current i that flows through this surface?
A. The signed current i is positive.
B. The signed current i is negative.
C. The signed current i is zero.
D. One cannot determine i’s sign from what is given.
Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing. B) The cloud's temperature is increasing and its density is decreasing. C) The cloud's temperature and density are both decreasing. D) The cloud's temperature is decreasing and its density is increasing. E) impossible to say