Which of the following would not protect low carbon steel from corrosion in contact with an electrolyte?
(a) Coat the steel completely with copper
(b) Attach the steel to the positive terminal of a 12 V battery
(c) Attach a piece of zinc to the steel in the area exposed to electrolyte
(d) Completely paint the steel
(b) Attach the steel to the positive terminal of a 12 V battery
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If M = 0.50 kg, L = 1.2 m, and the mass of each connecting rod shown is negligible, what is the rotational inertia about an axis perpendicular to the paper through the center of mass? Treat the mass as particles
?
?
a.
3.7 kg?m2
b.
2.8 kg?m2
c.
3.2 kg?m2
d.
2.3 kg?m2
e.
3.9 kg?m2
A horizontal plank (m = 2.0 kg, L = 1.0 m) is pivoted at one end. A spring (k = 1.0 × 103 N/m) is attached at the other end, as shown in the figure. Find the angular frequency (in rad/s) for small oscillations.
?
?
A. 39 B. 44 C. 55 D. 66 E. 25
The gibbous Moon is never visible in the daytime sky
a. True b. False Indicate whether the statement is true or false
An atom of the element iron has an atomic number of 26 and an atomic mass number of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 26 protons, 30 neutrons, 26 electrons B) 26 protons, 30 neutrons, 30 electrons C) 13 protons, 56 neutrons, 13 electrons D) 13 protons, 43 neutrons, 13 electrons E) 26 protons, 56 neutrons, 26 electrons