Fundamental Forces: The two strongest forces that act between protons in a nucleus are
A. the weak nuclear and electromagnetic forces.
B. the weak nuclear and the gravitational forces.
C. the electrostatic and the gravitational forces.
D. the strong nuclear and the electrostatic forces.
Answer: D
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What technique for measuring distance can you use to discover Hubble's Law?
A.) Cepheid variables in galaxies. B.) White dwarf supernovae in galaxies. C.) Redshifts of bright objects in galaxies. D.) A and B. E.) All of the above.
What is the Gulf Stream?
What will be an ideal response?
Rotational Dynamics: A uniform rod is 2.0 m long. It is hinged to a wall at its left end, and held in a horizontal position at its right end by a vertical very light string, as shown in the figure. What is the angular acceleration of the rod at the moment after the string is released if there is no friction in the hinge?
A. 15 rad/s2 B. 3.3 rad/s2 C. 7.4 rad/s2 D. 11 rad/s2 E. It cannot be calculated without knowing the mass of the rod.
Newton's 3rd Law of Motion states that
A) action and reaction are equal and opposite B) force equals mass times acceleration C) an object moves at a constant velocity unless a force acts D) the force of gravity decreases with increasing distance