The essentials of the first law of motion were initially developed by
a. Aristotle.
b. Galileo.
c. Newton.
d. an unknown scientist.
b
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If an object of mass 9 kg has a velocity of 7 m/s, what is its linear momentum?
a. 63 kg-m/s b. 1.3 kg-m/s c. 0.78 kg-m/s d. 16 kg-m/s e. cannot be determined
Chunks of rock and metal that orbit the Sun but are much smaller than the planets are referred to as
A) comets B) dwarf planets C) meteors D) asteroids
A cubical box 25.00 cm on each side is immersed in a fluid. The pressure at the top surface of the box is 109.4 kPa and the pressure on the bottom surface is 112 kPa. What is the density of the fluid?
A) 1000 kg/m3 B) 1030 kg/m3 C) 1060 kg/m3 D) 1090 kg/m3 E) 1120 kg/m3
The discovery of the cosmic microwave background was important because
A) its detection was a major advance in microwave testing. B) it was experimental verification of a prediction from the Big Bang theory. C) it showed the universe must be closed, with more than the critical density here. D) it established a firm center of the universe. E) it proved that astronomy at radio wavelengths was possible.