A hockey puck slides off the edge of a horizontal platform with an initial velocity of 28.0 m/shorizontally in a city where the acceleration due to gravity is 9.81 m/s2. The puck experiences no significant air resistance as it falls
The height of the platform above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground?
A) 77.2° B) 12.8° C) 31.8° D) 72.6° E) 12.6°
E
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A. Be useful to a large number of people for communication regarding dates. B. Use natural time intervals such as those defined by the Moon. C. Be able to accurately predict when an asteroid will strike the Earth. D. Keeps track of time over long periods.
Long-period comets are believed to originally come from
A) the Kuiper belt. B) the Oort cloud. C) the satellite system of Jupiter. D) the interstellar medium. E) the asteroid belt.
Which of these electromagnetic waves have the shortest wavelength?
A) radio waves B) infrared waves C) X-rays D) ultraviolet waves E) light waves
Why might it be difficult for Earth-like planets to form around Sun-like stars in the inner parts of the disk of our galaxy?
A) any stars would be sucked into the central supermassive black hole B) there would be insufficient amounts of heavy elements C) the stars would be packed together too densely for planets to be stable D) there would be too much harmful radiation