Aristotle's "continuous" model of matter was proved wrong about 1807 by

a. Bohr.
b. Thomson.
c. Dalton.
d. Rutherford.


c

Physics & Space Science

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A solar eclipse that occurs when the moon's umbra does not reach Earth's surface is called

a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral solar eclipse. e. an umbral solar eclipse.

Physics & Space Science

A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN, P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:


(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm

Physics & Space Science

When water evaporates from a body of water, what type of sediment is left behind?

What will be an ideal response?

Physics & Space Science

In an air-free chamber, a pebble is thrown horizontally, and at the same instant a second pebble is dropped from the same height. Compare the times of fall of the two pebbles

A) The thrown pebble hits first. B) The dropped pebble hits first. C) They hit at the same time. D) We cannot tell without knowing which pebble is heavier.

Physics & Space Science