Isotopes have the same number of
A) protons and neutrons
B) protons but a different number of electrons
C) neutrons but a different number of protons
D) protons but a different number of neutrons
D
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A steel beam (E 5 210 GPa) with I 5 119 3 106 mm4 and span length L 5 3.5 m is subjected to uniform load q 5 9.5 kN/m. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 13 mm
(C) 17 mm
(D) 19 mm
A rubber rod rubbed with fur becomes
A) positively charged. B) negatively charged. C) both D) neither
The joule
a)is a unit in the British system b)can be used as a unit for either work or energy. c) is a unit of power. d) can only be used to designate mechanical kinetic energy.
The difference between a camera and the human eye is that a camera utilizes a fixed focal length lens and the eye does not
Indicate whether the statement is true or false