BYU Physics 121 Chapter 11 Conceptual
Questions and answers correctly solved
2025
In order to change the angular momentum of an object, it is necessary to
apply - correct answer ✔a net torque to the object.
We have three vectors, labeled A, B, and C. A points due west, B points due
north, and C points due east. We don't know their relative magnitudes. We
find the cross product of each of these vectors with a vector which points due
south (D). Rank the three cross products ( ) from smallest to largest in terms
of their vertical component, taking the sign of the component into account. -
correct answer ✔C*D, B*D, C*D
A spinning ice skater can change her rate of rotation by drawing in her
outstretched arms. We can best understand this phenomenon by observing
that - correct answer ✔her angular momentum remains constant in this
process.
We have two vectors that line in the x-y plane. If we take the cross-product of
those two
vectors we know that - correct answer ✔the cross-product vector will be in
either the +z or -z direction.
A particle of mass 0.5 kg has velocity 2 m/s. It is moving at constant velocity
along a
line that passes 0.5 m away from the origin, as shown in the figure below.
Rank the
angular momentum of the particle when it is at the points A, B, and C from
smallest to
Questions and answers correctly solved
2025
In order to change the angular momentum of an object, it is necessary to
apply - correct answer ✔a net torque to the object.
We have three vectors, labeled A, B, and C. A points due west, B points due
north, and C points due east. We don't know their relative magnitudes. We
find the cross product of each of these vectors with a vector which points due
south (D). Rank the three cross products ( ) from smallest to largest in terms
of their vertical component, taking the sign of the component into account. -
correct answer ✔C*D, B*D, C*D
A spinning ice skater can change her rate of rotation by drawing in her
outstretched arms. We can best understand this phenomenon by observing
that - correct answer ✔her angular momentum remains constant in this
process.
We have two vectors that line in the x-y plane. If we take the cross-product of
those two
vectors we know that - correct answer ✔the cross-product vector will be in
either the +z or -z direction.
A particle of mass 0.5 kg has velocity 2 m/s. It is moving at constant velocity
along a
line that passes 0.5 m away from the origin, as shown in the figure below.
Rank the
angular momentum of the particle when it is at the points A, B, and C from
smallest to
