The Earth's atmosphere and magnetosphere contribute ________% to the total mass of the Earth
Fill in the blank(s) with correct word
Less than 0.1
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A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at ? = 450 nm and a brightness minimum at ? = 600 nm. What is the thickness of the oil film?
What will be an ideal response?
If the pole-vaulter were to land on concrete rather than on a cushion, the impulse that stops the fall would be:
a. greater because of the rigidity of the concrete. b. greater because the force of impact is greater. c. less, because there is less change in momentum during the stop. d. less, because he would come to a stop over a shorter period of time. e. the same because impulse is the change in momentum of the object.
What role does entropy play in chemical reactions?
A) The entropy determines how much product will actually be produced. B) The entropy change determines whether the reaction will be exothermic or endothermic. C) The entropy change determines whether the reaction will occur spontaneously or not. D) The entropy change determines whether or not the chemical reaction is favorable.
A student weighing 200 N climbs a flight of stairs 9.0 m high in 4 s. What power is required to perform this task?
a. 1800 J b. 800 J c. 1800 W d. 800 W e. 450 W