What is absolutely necessary for living organisms to survive?
A) energy
B) sunlight
C) oxygen
D) food in the form of other organisms
E) all of the above
A
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If I fire a cannonball from the top of a mountain, traveling parallel to the Earth's surface at 14,000 miles per hour (6.26km/s), it travels a great distance before falling to Earth. If instead, I fire it at 16,000 miles per hour (7.15km/s) it:
A) travels completely around the Earth before returning to the mountaintop B) drops to Earth immediately C) travels the whole way to the Moon, orbits it once, then comes back D) travels a much smaller distance before falling to Earth E) travels exactly the same distance before falling to Earth
What do we mean by the singularity of a black hole?
A) There are no binary black holes—each one is isolated. B) An object can become a black hole only once, and a black hole cannot evolve into anything else. C) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions. D) It is the edge of the black hole, where one could leave the observable universe. E) It is the "point of no return" of the black hole; anything closer than this point will not be able to escape the gravitational force of the black hole.
Three cars (car L, car M, and car N) are moving with the same velocity, and slam on the brakes. The most massive car is car L, and the least massive is car N
Assuming all three cars have identical tires, for which car is the amount of work done by friction in stopping it the highest? A) The amount of work done by friction is the same for all cars. B) Car L C) Car M D) Car N
A venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (r = 1.2 kg/m3.)
a. 70 Pa b. 85 Pa c. 100 Pa d. 120 Pa e. 81 Pa