A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of 5 × 10-5 T
If the magnetic field vector points straight down, what emf is induced between the two ends of the bar?
A) 1.6 × 10-4 V
B) 5.6 × 10-3 V
C) 2.0 × 10-4 V
D) 7.0 × 10-4 V
E) 3.6 × 10-3 V
C
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Identify a true statement about main-sequence stars
A) They balance their gravity by fusing hydrogen. B) They generate energy by breaking uranium isotopes. C) They do not increase in size as they consume their fuel. D) They do not undergo any molecular change during their life spans.
Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial planet's geological destiny?
A) its size B) its composition C) its distance from the Sun D) whether or not it has liquid water
A gamma ray is another name for an electron
a. True b. False Indicate whether the statement is true or false
Two bodies, A and B, collide as shown in Figures I and II below
Which statement is true?
a.
They exert equal and opposite forces on each other in I but not in II.
b.
They exert equal and opposite force on each other in II but not in I.
c.
They exert equal and opposite force on each other in both I and II.
d.
The forces are equal and opposite to each other in I, but only the components of the forces parallel to the velocities are equal in II.
e.
The forces are equal and opposite in I, but only the components of the forces perpendicular to the velocities are equal in II