Which of the following statements is an inference from a model (rather than an observation)?
A) The photosphere emits visible light.
B) The Sun emits neutrinos.
C) The Sun's core is gradually turning hydrogen into helium.
D) The corona is hotter than the photosphere.
E) The photosphere is made out of mainly hydrogen and helium.
C
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Consider a plane flying with groundspeed Vg and airspeed Va in a wind with velocity V. Which of the following relationships is true?
A) Vg = Va + V B) Vg can be less than Va + V C) Vg can be greater than Va + V D) Vg can have any value between Va + V and Va - V E) Vg = Va - V
As a spaceship moves away from you at half the speed of light, it fires a probe, also away from you at half the speed of light relative to the spaceship. Relative to you, the probe moves at
A) 0.80c. B) 0.87c. C) 0.90c. D) 0.95c. E) c.
In the telescope, ________ shows the most turbulent atmosphere, with changes easily seen even with amateur telescopes
A) Saturn B) Uranus C) Pluto D) Neptune E) Jupiter
At t = 0, a particle is located at x = 25 m and has a velocity of 15 m/s in the positive x direction. The acceleration of the particle varies with time as shown in the diagram. What is the position of the particle at t = 5.0 s?
a.
175 m
b.
125 m
c.
138 m
d.
154 m
e.
165 m