What is the purpose of adaptive optics?
A) It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
B) It allows several small telescopes to work together like a single larger telescope.
C) It is a special technology that allows the Hubble Space Telescope to adapt to study many different types of astronomical objects.
D) It allows ground-based telescopes to observe ultraviolet light that normally does not penetrate the atmosphere.
A
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The "Milky Way" in the night sky looks like a blurry circle of light in the sky because
A) we are seeing the stars and gas that lie in disk of our Milky Way Galaxy. B) our Sun is located at the center of our galaxy. C) the stars within this band of light are much farther away than other stars. D) our rotating Earth blurs our view of stars in the Milky Way Galaxy.
A star cluster of age 100 million years contains no type O stars
Indicate whether the statement is true or false
A 1.6-kg block slides down a plane (inclined at 25° with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
A. +28 W B. +13 W C. ?13 W D. ?28 W E. +6.5 W
A projectile that is fired vertically at 8 km/s from Earth's surface will
A) go into circular orbit about Earth. B) rise and fall back to Earth's surface. C) follow an uncertain path. D) escape from Earth.