The brakes in a car work because of

a. Archimedes' principle.
b. Pascal's principle.
c. Bernoulli's principle.
d. Torricelli's principle.
e. none of these principles.


b

Physics & Space Science

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Which physical unit is the SI acceleration of gravity?

A) 40 km, SW B) 32 ft/s2 C) 9.8 m/s2 D) 186,000 mi E) -120 mi/s

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A 1.9-m2 Thermopane window is constructed by using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 25.0 °C from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.840 J/s/m/°C and for air 0.023 4 J/s/m/°C.)

a. 2 530 W b. 426 W c. 3 190 W d. 210 W e. 2 100

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You are trying to cross a river that flows due south with a strong current. You start out in your motorboat on the east bank desiring to reach the west bank directly west from your starting point. You should head your motorboat

A) due west. B) due north. C) due south. D) in a southwesterly direction. E) in a northwesterly direction.

Physics & Space Science

When something cannot be directly observed, it can be represented by a?

A. hypothesis B. model C. graph D. theory

Physics & Space Science