An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4
0 cm? A)
0.32 m/s
B)
0.64 m/s
C)
1.28 m/s
D)
2.56 m/s
E)
5.12 m/s
E
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Friction: A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400, and the coefficient of kinetic friction is 0.300. What is the maximum acceleration that the truck can have if the crate is to stay in place relative to the truck?
A. 3.92 m/s2 B. 7.84 m/s2 C. 8.00 m/s2 D. 78.5 m/s2 E. 196 m/s2
The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 91.50 in2. The number of significant figures in the width measurement must be at least:
a. 5 b. 6 c. 8 d. 4
Which one of the following is the correct electronic configuration for carbon?
A) 1s2 2s2 2p2 B) 1s1 2p1 C) 1s1 2s2 2p1 D) 1s1 2s1 2p1 E) 1s2 2s2 2p4
The particle that orbits the central core inside an atom is
a. the electron. b. the proton. c. the neutron. d. the nucleus. e. none of the above.