1. A charged particle is traveling through a uniform magnetic field. Which of the following statements are true of the magnetic field? A: It exerts a force on the particle parallel to the field. B: It exerts a force on the particle along the direction of its motion. C: It increases the kinetic energy of the particle. D: It exerts a force that is perpendicular to the direction of motion.
1. A charged particle is traveling through a uniform magnetic field. Which of the following statements are true of the magnetic field? A: It exerts a force on the particle parallel to the field. B: It exerts a force on the particle along the direction of its motion. C: It increases the kinetic energy of the particle. D: It exerts a force that is perpendicular to the direction of motion.
中国大学MOOC: A particle of mass m is exerted with a force. Which of the following forces is not a conservative force?(g, k, C, D and γ are constants, and υ is the speed of particle.)
中国大学MOOC: A particle of mass m is exerted with a force. Which of the following forces is not a conservative force?(g, k, C, D and γ are constants, and υ is the speed of particle.)
A particle is subjected to forces of [img=18x22]1803a46e41745d3.png[/img], [img=18x22]1803a46e4a7b58d.png[/img], ¼ and [img=20x22]1803a46e54cefd0.png[/img], and the resultant of these forces is [img=78x36]1803a46e5d7bb8f.png[/img]. Which statement is correct? A: The moving direction of the particle must be the same as that of the resultant force [img=14x19]1803a46e65bb7b5.png[/img]. B: The greater the resultant force [img=14x19]1803a46e6dfa97e.png[/img], the greater the speed of the particle. C: The greater the resultant force [img=14x19]1803a46e772e05b.png[/img], the greater the acceleration of the particle. D: The acceleration direction of the particle may or may not be the same as that of the resultant force [img=14x19]1803a46e772e05b.png[/img].
A particle is subjected to forces of [img=18x22]1803a46e41745d3.png[/img], [img=18x22]1803a46e4a7b58d.png[/img], ¼ and [img=20x22]1803a46e54cefd0.png[/img], and the resultant of these forces is [img=78x36]1803a46e5d7bb8f.png[/img]. Which statement is correct? A: The moving direction of the particle must be the same as that of the resultant force [img=14x19]1803a46e65bb7b5.png[/img]. B: The greater the resultant force [img=14x19]1803a46e6dfa97e.png[/img], the greater the speed of the particle. C: The greater the resultant force [img=14x19]1803a46e772e05b.png[/img], the greater the acceleration of the particle. D: The acceleration direction of the particle may or may not be the same as that of the resultant force [img=14x19]1803a46e772e05b.png[/img].
Which of the following explains why a magnetic field does no work on a moving charged particle?( ) A: The magnetic force depends on the speed of the particle. B: There is always an electric field that cancels the work done by the magnetic field. C: The magnetic force is always perpendicular to the direction of motion. D: The magnetic force depends on the direction of motion of the particle. E: The magnetic force is conservative.
Which of the following explains why a magnetic field does no work on a moving charged particle?( ) A: The magnetic force depends on the speed of the particle. B: There is always an electric field that cancels the work done by the magnetic field. C: The magnetic force is always perpendicular to the direction of motion. D: The magnetic force depends on the direction of motion of the particle. E: The magnetic force is conservative.
So far we _____ the displacement of a particle.
So far we _____ the displacement of a particle.
Which type of radiation do we use for bone metastatic tumor treatment（ ） A: Beta particle B: alfa particle C: Gama particle D: A and B
Which type of radiation do we use for bone metastatic tumor treatment（ ） A: Beta particle B: alfa particle C: Gama particle D: A and B
中国大学MOOC: __________ we are calculating is the instantaneous acceleration of the particle.
中国大学MOOC: __________ we are calculating is the instantaneous acceleration of the particle.
A _______ is the locus of points traversed by a given particle as it travels in a field of flow; it provides us with a “ history ” of the particle’s locations. A: system B: streamline C: pathline D: particle
A _______ is the locus of points traversed by a given particle as it travels in a field of flow; it provides us with a “ history ” of the particle’s locations. A: system B: streamline C: pathline D: particle
It is a quantum particle, behaving in some experiments like a classical particle and in some experiments like a classical wave.
It is a quantum particle, behaving in some experiments like a classical particle and in some experiments like a classical wave.
要实现渐变贴图应选择（ ）。 A: Gradient B: Raytrace C: Particle Age D: Particle Mblure
要实现渐变贴图应选择（ ）。 A: Gradient B: Raytrace C: Particle Age D: Particle Mblure