The orbits of halo stars are typically circular and have a low inclination with respect to the disk
Indicate whether the statement is true or false
F
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The kinetic energy of a body is correctly given by which of the following expressions? (m=mass, v=speed)
A. mv2 B. mv C. (½)mv D. 2mv2 E. (½)mv2
One difference between moving charges and stationary charges is that
A) moving charges exert both electric and magnetic forces, while stationary charges exert neither electric nor magnetic forces. B) moving charges exert only magnetic forces, while stationary charges exert both electric and magnetic forces. C) moving charges exert both electric and magnetic forces, while stationary charges exert only electric forces. D) moving charges exert only magnetic forces, while stationary charges exert only electric forces. E) moving charges stay slender, while stationary charges are couch potatoes.
What do the three black arrows represent?
A) the tidal force Earth exerts on the Moon B) the Moon's gravitational force at different points on Earth C) the direction in which Earth's water is flowing D) Earth's orbital motion
We observe that a moving charged particle experiences no magnetic force. From this we can definitely conclude that
A) no magnetic field exists in that region of space. B) the particle must be moving parallel to the magnetic field. C) the particle is moving at right angles to the magnetic field. D) either no magnetic field exists or the particle is moving parallel to the field. E) either no magnetic field exists or the particle is moving perpendicular to the field.