A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
a. 43 m/s
b. 47 m/s
c. 39 m/s
d. 36 m/s
e. 14 m/s
b
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Conversion of Units: A speed of 60 mi/h is closest to which of the following? (2.54 cm = 1.00 in.)
A. 60 m/s B. 20 m/s C. 30 km/h D. 120 m/s E. 30 m/s
Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Active galactic nuclei exist tend to become less active as they age. B) Supermassive black holes existed only when the universe was young, and no longer exist today. C) Active galactic nuclei can form only at large distances from the Milky Way. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
The tree of life
A) traces back the evolution of all mammals to a common ancestor B) classifies organisms according to their physical appearance C) illustrates the biochemical and genetic relationships between the different domains of life D) is a name for the first organism from which all life originated
What is the minimum x-ray wavelength produced when electrons are accelerated through a potential of 46,800 V? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 eV = 1.60 × 10^?19 J)
a. 4.25E–11 m b. 8.85E–12 m c. 4.01E–12 m d. 2.66E–11 m e. 6.80E–11 m