Which of the following observatories is most likely to discover a black hole in a binary system?
A) the Hubble Space Telescope
B) the Chandra X-Ray Observatory
C) the SOFIA airborne infrared observatory
D) the Arecibo Radio Observatory
B
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One light-hour is the distance light travels in one hour. The speed of light is about 300,000 km/s . How far is 1 light-hour?
A) 300 thousand km (300,000, or 3 × 105 km) B) 1.08 billion km (1,080,000,000, or 1.08 ×109 km) C) 18 million km (18,000,000, or 1.8 × 107 km) D) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The acceleration after starting from rest is 8 m/s2
a. True b. False Indicate whether the statement is true or false
A buoy, used to mark a harbor channel, consists of a weighted rod 2.00 m in length. 1.50 m of the rod is immersed in water and 0.500 m extends above the surface
If sunlight is incident on the water with an angle of incidence of 40.0°, what is the length of the shadow of the buoy on the level bottom of the harbor?
What is the highest frequency of the photons produced by a 29-kV x-ray machine? (h = 6.63 × 10^?34 J?s)
a. 4.4E+18 Hz b. 7.0E+15 Hz c. 4.4E+15 Hz d. 7.0E+18 Hz e. 3.1E+20 Hz