In a room where g = 9.81 m/s2, a hockey puck slides off the edge of a platform with an initial velocity of 28.0 m/s horizontally. The height of the platform above the ground is 2.00 m
What is the speed of the puck just before it hits the ground? The air resistance is negligibly small.
A) 28.7 m/s B) 6.26 m/s C) 28.0 m/s D) 48.2 m/s E) 26.3 m/s
A
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The jets emitted by compact objects are made of _____
a. X-rays b. atomic nuclei c. neutrons d. neutrinos e. positrons
A spaceship, traveling at 0.100c away from a stationary space platform, launches a secondary rocket towards the station, with a speed of 0.560c relative to the spaceship. What is the speed of the secondary rocket relative to the space platform?
A) 0.460c B) 0.487c C) 0.492c D) 0.660c
The increase of atmospheric CO2 levels to 400 ppm has tipped Earth's natural greenhouse effect toward global warming. The rise of CO2 is due to
A) human activity—the burning of fossil fuels (coal, oil, and gas) and deforestation. B) human activity—overpopulation and increased reliance on solar energy. C) human negligence—efforts of not recycling waste materials for potential reuse. D) the industrial revolution and increased cloud cover.
Propanol (C3H8O) is boiled in a container at 101 kPa and where the surface temperature is 120ºC. Its saturation temperature is 97.4ºC and its heat of fusion is 697 kJ/kg. Estimate the heat transfer per unit area.
What will be an ideal response?