When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation.
b. can be decreased by shifting mass out away from the axis of rotation.
c. can be increased by shifting mass in toward the axis of rotation.
d. can be decreased by shifting mass in toward the axis of rotation.
e. cannot be changed except by friction at the point of contact.
E
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In a thunderstorm, the falling rain creates
A) an updraft that generates a storm cell within the cloud. B) a downdraft, chilling the air and making it denser than the surrounding air. C) a downdraft, chilling the air and making it less dense than the surrounding air. D) an updraft, chilling the air and making it denser than the surrounding air.
The Galilean moons are _______________ satellites because they are large and orbit close to their parent planet
Fill in the blank(s) with correct word
An ideal spring has a spring constant (force constant) of 60 N/m. How much energy does it store when it is stretched by 1.0 cm?
A) 0.30 J B) 60 J C) 0.0030 J D) 600 J
A 100-newton sack of potatoes falls from an airplane. As velocity of fall increases, air resistance also increases, and when air resistance equals 100 N, the acceleration of the sack is
1) zero 2) 5 m/s2 3) 10 m/s2 4) 100 m/s2 and the velocity of the sack will be 5) 0 m/s. 6) 5 m/s. 7) 10 m/s. 8) 100 m/s. 9) constant.