A red supergiant is observed in a globular cluster in another galaxy (located 150,000 light years away). It is predicted, based on its mass and age of the star that it will supernova in about 10,000 years. Is this star still there?
A) No, it died in a supernova 10,000 years ago.
B) No, it died in a supernova 140,000 years ago.
C) No, it died in a supernova 150,000 years ago.
D) Yes, it will die in a supernova in 10,000 years.
E) Yes, it will die in a supernova 160,000 years from now.
B
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An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. Where is the final image formed?
A) 25 cm in front of the second lens B) 8 cm in front of the second lens C) 8 cm after the second lens D) 10 cm after the second lens E) 25 cm after the second lens
Causing an object to start moving on a frictional surface requires
A. less force than is needed to keep it moving on the surface. B. the same force as is needed to keep it moving on the surface. C. more force than is needed to keep it moving on the surface. D. a force equal to the weight of the object. E. a force opposite to the normal force.
Dark matter does not affect galaxy collisions
Indicate whether the statement is true or false
The angle of the Sun's rays striking Earth's surface greatly affects the
A) Earth's seasons. B) equatorial and polar regions. C) intensity of solar energy received at Earth's surface. D) distribution of solar energy—from the poles to the equator, hours of daylight, and the seasons.