The four fundamental forces that operate in the universe today are

A) strong force, weak force, electromagnetic force, gravity.
B) strong force, weak force, electric force, magnetic force.
C) nuclear force, electromagnetic force, gravity, tidal force.
D) nuclear force, gravity, electric force, magnetic force.


A

Physics & Space Science

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On the earth, the period of a pendulum clock is 1.0 s. On a spaceship traveling at 0.8c, the period of the same clock is :

A. less than 1.0 s B. equal to 1.0 s C. greater than 1.0 s

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A particle is in the ground state of a one-dimensional box of length 1.0 m. What is the minimum value of its momentum (in kg × m/s)?

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Vector V1 is (5i + 7j - 3k) and V2 = (7i + 2j + 14k). The vector product of these two vectors is:

(A) -104i + 72j - 39k (B) -124i + 62j - 33k (C) 104i - 91j - 39k (D) -114i - 12j + 91k

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