An athlete participates in a discus throw competition during an Olympiad that takes place in a city where acceleration due to gravity is 9.80 m/s2. He throws the discus with an initial velocity of 20.0 m/s at an angle of 30.0° above the horizontal
Neglecting the height of the discus at the point of release, what is the range of the discus? A) 35.3 m
B) 20.4 m
C) 40.0 m
D) 60.0 m
E) 50.0 m
A
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An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?
A) 12 s B) 6.0 s C) 10 s D) 8.0 s
What is the physical difference between light and a radio wave?
A) Light waves have a higher frequency than radio waves. B) Light is an electromagnetic wave while radio is a pressure wave in air. C) Light waves have a longer wavelength than radio waves. D) Light waves have a larger amplitude than radio waves. E) None of the above.
An ideal gas is confined to a container with constant volume. The number of moles is constant. By what factor will the pressure change if the absolute temperature triples?
a. 2/3 c. 3 b. 1/3 d. 9
We can see each other in the classroom right now because we
A) emit thermal radiation. B) emit visible light. C) emit infrared light. D) reflect visible light. E) reflect infrared light.