Galileo challenged the idea that objects in the heavens were perfect by ________
A) observing sunspots on the Sun and mountains on the Moon
B) inventing the telescope
C) proving Kepler's laws were correct
D) showing that heavy objects fall at the same rate as lighter objects
A
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One of Tycho Brahe's major contributions to astronomy was to prove that ________ was ________.
A. a comet; outside Earth's atmosphere B. a supernova (exploding star); much farther away than the planets C. the Sun; the center of the solar system D. both A and B E. A, B, and C
The 105°W longitude meridian is the center of the ______________ Standard Time zone in the United States
a. Pacific b. Mountain c. Eastern d. Central
Which of the following wavelengths is common to a 10 cm tube open at both ends and a 15 cm tube open at one end and closed at the other?
1.60 cm 2.30 cm 3.20 cm 4.15 cm 5.5 cm 6.Two of the above 7.Three of the above 8.None of the above
Hector drives a pickup truck horizontally at 15.0 m/s. He is transporting a crate of delicate lead crystal. If the coefficient of static friction between the crate and the truck bed is 0.300, what is the minimum stopping distance for the truck so the crate will not slide?
a. 28.7 m c. 38.3 m b. 51.0 m d. 44.4 m