If we imagine launching an apple into a circular orbit about Earth and ignore the effects of air resistance, we know that the apple will experience
A. a constant velocity.
B. no net force.
C. a force due to its inertia.
D. a centripetal force due to gravity.
Ans: D. a centripetal force due to gravity.
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Since brown dwarfs cannot ignite hydrogen fusion, how might we hope to spot them? What role does deuterium play in this?
What will be an ideal response?
Exhibit 18-1The figure below shows wave crests after a stone is thrown into a pond.
Use this exhibit to answer the following question(s).
Refer to Exhibit 18-1. The phase difference in radians between points A and C is
A.
B.
.C.
D.
.E.
The Earth's core has a density of _____
A) 5.5 g/cm3 B) 10.5 g/cm3 C) 14 g/cm3 D) 18.5 g/cm3
Total Internal Reflection: An optic fiber is made of clear plastic with an index of refraction of 1.50. For what range of angles of incidence ? with the lateral surface of the fiber will light remain inside the plastic "guide" if it is surrounded by air?
A. 21.1° < ? < 90° B. 23.4° < ? < 90° C. 38.3° < ? < 90° D. 40.3° < ? < 90° E. 41.8° < ? < 90°