In the context of the evidence on evolution of stars, you can estimate the _____ of a star cluster by observing the distribution of the points that represent its stars in the Hertzsprung-Russell (H-R) diagram
A) age
B) density
C) composition
D) mass
A
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Our Sun will likely undergo a nova event in about 5 billion years
Indicate whether the statement is true or false
Process of Science: Explain how we can use telescopes as time machines to directly test theories of galaxy formation
What will be an ideal response?
Consider a wire in a magnetic field, as shown in the following figure, with a current flowing through it. What will happen to the wire?
a.
The wire will be forced toward the north pole.
b.
The wire will be forced perpendicular to the plane of the magnetic field.
c.
The current will cease flowing.
d.
Nothing will happen.
Force on a Wire: A wire is carrying current vertically downward. What is the direction of the force on this wire due to Earth's magnetic field?
A. horizontally towards the north B. horizontally towards the south C. horizontally towards the east D. horizontally towards the west E. vertically upward