What natural barrier tries to prevent two protons from combining?
A) Dark energy
B) Antigravity
C) Electromagnetic repulsion
D) The weak nuclear force
E) The strong nuclear force
C
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Dust is an important part of the nebular theory of solar system formation because dust is needed to explain:
A) how the inner planets came to be rocky bodies. B) how the outer planets came to be gaseous bodies. C) how the initial cloud cooled enough to collapse. D) how the initial cloud heated as it contracted. E) why the icy bodies are located so far from the Sun.
A puck on a frictionless air hockey table has a mass of 5.0 kg and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The angular momentum of the puck (in kg?m2/s) is
a.
80
b.
20
c.
30
d.
60
e.
50
A starship navigator measures the distance between the Earth and the Sun. If the ship is moving at a speed of 0.90c, instead of obtaining 93 million miles, the navigator measures a distance (in millions of miles) of
A. 41. B. 30. C. 80. D. 215. E. 90.
The sun subtends an angle of 0.00928 rad when viewed from the surface of the earth, and its distance from Earth is 1.5 × 1011 m. What is the diameter of the sun?
What will be an ideal response?