The first postulate of special relativity says that:

a. the laws of physics are all the same.
b. the laws of physics are the same in all reference systems.
c. the laws of physics are the same in all non-inertial reference systems.
d. the laws of physics are the same in all inertial reference systems.
e. the laws of physics are the same in all closed reference systems.

d

Physics & Space Science

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Two identical ladders are 3.0 m long and weigh 600 N each. They are connected by a hinge at the top and are held together by a horizontal rope, 1.0 m above the smooth floor forming a symmetric "A" arrangement

The angle between the ladders is 60° and both ladders have their center of gravity at their midpoint. What is the tension in the rope? A) 240 N B) 300 N C) 220 N D) 260 N E) 280 N

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Physics & Space Science

Davisson and Germer used a nickel crystal for their scattering experiments that had been modified when they tried to repair it. Which of the following describes the major change from before they tried to repair it and afterward that allowed them to work on the groundbreaking experiments they did?

A. The oxidation of the nickel from immediately after it was taken from a vacuum environment introduced impurities with intermediate band gaps. B. The heating processes created larger crystals, which allowed them to clearly see the electron diffraction. C. Under the intense heat of their repair process, the electrons were scattered off of energetically oscillating nickel atoms, whereas before they hit the stationary lattice atoms. D. Their knowledge of the new nickel crystals led them to believe that electrons with low energy (on the order of ~10 eV) only would scatter off of the closely spaced nickel atoms.

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Physics & Space Science

A planet has 3 moons, all of equal mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r, and moon 3 is in a circular orbit of radius 3r. The ratios of the gravitational force exerted by the planet on each of the moons, 1, 2, and 3 are ________ respectively

1.1:2:3 2.1:1:1 3.1:4:9 4.9:4:1

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Physics & Space Science

A 0.140-kg baseball is thrown with a velocity of It is struck by the bat exerting an average force of 5000 N, which results in a velocity of 37.0 m/s in the opposite direction from the original velocity. How long were the bat and ball in contact?

A) 1.79 × 10-3 s B) 1.28 × 10-2 s C) 3.07 × 10-2 s D) 4.30 × 10-3 s

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Physics & Space Science