Distances/Angular momenta/Quiz

Angular momentum is a lecture from the radiation astronomy department about a classical topic of Newtonian kinetics.

This is an artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. Credit: ESO/L. Calçada.

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Quiz

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1 Yes or No, When swinging a baseball bat, the end of the bat farthest away from the swinger has angular momentum.

	Yes
	No

2 What effect does the distribution of angular momentum in the solar system have on the origin of the Sun?

	an initially spherical and contracting nebula spinning faster as it collapses would produce the present situation in the solar system
	partitioning mass and angular momentum does not seem possible with a contracting nebula
	the rotation axis of the Sun from that of the system as a whole if formed by nebular collapse seems very unlikely
	the angular-momentum problem does not arise with the accretion theory
	surface differential rotation of the Sun results
	by the nature of the floccule process the star so formed will have little angular momentum

3 True or False, The differential profile of the Sun's surface extends into the solar interior as rotating cylinders of constant angular momentum.

	TRUE
	FALSE

4 Which of the following are involved in kinetics?

	a quantity cohering together so as to make one body, or an aggregation of particles or things which collectively make one body or quantity
	objects in motion, but not with the forces involved
	every body persists in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed
	the product of a body's mass and velocity
	the rotary inertia of a system such as an isolated rigid body is a measure of the extent to which an object will continue to rotate in the absence of an applied torque
	a turning effect of a force applied to a rotational system at a distance from the axis of rotation

5 True or False, Any conversion of mechanical energy into electrical energy and associated magnetic fields is a dynamo.

	TRUE
	FALSE

6 True or False, Star fission may be the splitting of a star at a critical angular momentum.

	TRUE
	FALSE

7 Yes or No, A relationship exists between force (F), torque (τ), momentum (p), and angular momentum (L) vectors in a rotating system.

	Yes
	No

8 True or False, A rotational or twisting effect of a force is called a torque.

	TRUE
	FALSE

9 Yes or No, A radius vector consists of two parts or concepts: a distance, or displacement, and a direction, indicated by the arrow.

	Yes
	No

10 True or False, In a closed system, no torque can be exerted on any matter without the exertion on some other matter of an equal and opposite torque.

	TRUE
	FALSE

Hypotheses

Main resource: Hypotheses

1. Angular momenta can be created, enhance, countered or eliminated by charge distributions.

See also

• Angular momentum and energy
• Distances

External links

{{Physics resources}}