Which of the following is not a general characteristic of the four jovian planets in our solar system?
A) They lack solid surfaces.
B) They are composed mainly of hydrogen, helium, and hydrogen compounds.
C) They are higher in average density than are the terrestrial planets.
D) They are much more massive then any of the terrestrial planets.
C
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Our Sun is made of about 28% helium (by mass). Where did this helium come from?
A) Fusion in stars B) The Big Bang only C) Mostly from fusion in stars with a small contribution from the Big Bang D) Mostly from the Big Bang with a small contribution from fusion in stars E) Radioactive decay of heavier elements only
The first rover to explore Mars in 1997 was called
A) Opportunity B) Spirit C) Sojourner D) Curiosity
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N. As the string unwinds the pulley begins to rotate
What is the speed of the string after it has unwound 1.25 m? A) 2.09 m/s B) 2.36 m/s C) 1.18m/s D) 3.18 m/s E) 4.95 m/s
A spring wound clock makes use of ________ energy to drive the mechanism.
What will be an ideal response?