Built in 1963, the _______________ telescope in Puerto Rico is the largest single radio dish in the world
Fill in the blank(s) with correct word
Arecibo
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An object falling vertically at a speed of 20 m/s lands in a snowbank and comes to rest 0.5 s later. The object’s average acceleration during this interval is
A. Upward B. Downward C. Zero
By studying distant galaxies in the 1920s, Hubble made which of the following important discoveries that led us to conclude that the universe is expanding?
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies were born at the same time, and all will die at the same time. C) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. D) All galaxies outside the Local Group are orbiting the Local Group. E) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.
Modern telescopes have allowed us to see 13 billion years back into the past.
a. true b. false
A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.