How is the age of the galaxy determined?
a. measuring the metallicity of Population II stars
b. finding the turnoff point in the H-R diagram of globular clusters
c. from the motion of stars in the galactic halo
d. counting the number of open clusters in the spiral arms
b
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A typical star burns helium for about the same amount of time it burns hydrogen
Indicate whether the statement is true or false
Which of the following is not generally true of all the terrestrial world lithospheres?
A) The lithosphere is broken into a set of large plates that float upon the softer rock below. B) Rock in the lithosphere is stronger than rock beneath it. C) The lithosphere extends from somewhere in the mantle all the way to the surface. D) The thickness of the lithosphere depends on interior temperature, with cooler interiors leading to thicker lithospheres.
If the current drawn from a 12 volt car battery is 100 amperes when it is short circuited with a wire, the resistance of the wire is 0.12 ohms
Indicate whether the statement is true or false
A uniform meterstick balances on a fulcrum placed at the 40-cm mark when a weight W is placed at the 20-cm mark. What is the weight of the meterstick?
a. W c. W/2 b. 2W d. 0.4W