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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The seasons are caused by Earth's orbit moving closer to or farther from the Sun
a. True b. False Indicate whether the statement is true or false
A solid sphere is rolling without slipping along a horizontal surface with a speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal. What is the speed of the sphere after it has rolled 3.00 m up the ramp?
A) 4.01 m/s B) 8.02 m/s C) 1.91 m/s D) 2.16 m/s E) 3.53 m/s
Two atoms of hydrogen bond with an atom of oxygen to form a water molecule. This bonding is
a. covalent only. b. polar only. c. both covalent and polar. d. none of these.
Assume that a uniform magnetic field is directed into this page. If a proton is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the proton?
a. into the page c. to the right b. to the left d. out of the page