Assuming equal rates of acceleration in both cases, how much longer would it take a car to stop if braking from 56 mi/h than from 28 mi/h?
A) 8 times as long
B) 4 times as long
C) 2 times as long
D) 1.4 times as long
E) the same in both cases
C
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Heisenberg is especially noted for his
A) wave equation. B) improved periodic table. C) dirigible. D) uncertainty principle. E) photoelectric theory.
The concept of hydrostatic equilibrium is critical to understanding how the Sun has remained stable long enough for life to evolve here
Indicate whether the statement is true or false
A bimetallic strip is usable as a thermometer because of
a. heat conduction b. heat convection c. heat radiation d. thermal expansion e. none of the above
Equilibrium: A 100-kg nonuniform boom that is 6.0 m long is loosely pinned at the pivot at P. A 600-kg concrete block is suspended from the end of the boom at A, as shown in the figure. The boom forms a 30° angle above the horizontal, and is supported by a 4.0-m cable between points D and B. Point B is 4.0 m from P, and point D is 4.0 m above P. The center of mass of the boom is at point C, which is 2.0 m from P. Assume that all the quantities shown in the figure are accurate to two significant figures. What is the tension in the cable connected between points B and D?
A. 9300 N B. 8400 N C. 8100 N D. 7500 N E. 6900 N