The most energy-efficient form of transportation in the animal kingdom is a human on a bicycle. A basic physics principle that helps explain the bicycle's high efficiency is
A) the law of inertia.
B) the electromagnetic force law.
C) the work-energy principle.
D) the law of conservation of energy.
E) the law of gravity.
A
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Which of the following best describes a website's brand?
A. An assurance or guarantee that a business offers its customers. B. The placement of objects on a webpage. C. The combination of design elements associated with the website and its publisher. D. A concise statement that a consumer readily associates with a business.
A 6.1-kg solid sphere, made of metal whose density is 2600 kg/ , is suspended by a cord. When the sphere is immersed in a liquid of unknown density, the tension in the cord is 26 N. Find the density of the liquid
A) 1500 kg/ B) 1400 kg/ C) 1300 kg/ D) 1200 kg/ E) 1100 kg/
In the figure, a laser positioned on a ship is used to communicate with a small two-man research submarine resting on the bottom of a lake
The laser is positioned 12 m above the surface of the water, and it strikes the water 20 m from the side of the ship. The water is 76 m deep and has an index of refraction of 1.33. How far horizontally is the submarine from the side of the ship? A) 84.1 m B) 64.1 m C) 104 m D) 74.1 m E) 94.1 m
How long is a day on Mars?
A) 243 Earth days B) about 4.2 Earth days C) 24 hours, 36 minutes D) 23 hours, 56 minutes E) 9 hours, 55 minutes