From film taken in SkyLab and the Space Shuttle, we learned that objects in SkyLab
A. have mass but no weight.
B. have mass but no force due to gravity.
C. have neither mass nor weight.
D. fall to the floor with an acceleration of 9.5 m/s2.
Ans: A. have mass but no weight.
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The discovery of four moons in orbit about Jupiter by Galileo suggested that
A) the Earth moved about Jupiter B) the Earth moved about the Sun C) Jupiter moved about the Sun D) bodies could stay in orbit about a moving Jupiter
A box slides across a floor and comes to rest. The work done by the frictional force on the box is a. positive
b. negative. c. zero. d. impossible to determine without knowing the coefficient of friction.
Stars are born in
a. reflection nebulae. b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble.
Our calendar is based on the length of the tropical year rather than the sidereal year
Indicate whether the statement is true or false