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
d
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Potential Energy: A 7.0-?C point charge and a 9.0-?C point charge are initially extremely far apart. How much work does it take to bring the 7.0-?C point charge to the point x = 3.0 mm, y = 0.0 mm, and the 9.0-?C point charge to the point x = -3.0 mm, y = 0.0 mm? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 95 J B. 190 J C. 63 J D. 16 J
A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed. The object falls with an acceleration of 4.00 m/s2 downward when it is falling downward at 70.0 m/s
What is its terminal speed? A) 172 m/s B) 108 m/s C) 110 m/s D) 157 m/s E) 91.0 m/s
The threshold wavelength for photoelectric emission of a particular substance is 500 nm. What is the work function (in eV)?
a. 4.2 b. 4.0 × 10^?19 c. 4.0 × 10^?10 d. 2.5 × 10^?19 e. 2.5
A fireman, 40.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the initial speed of the stream is 40.0 m/s, at what height above the nozzle will the stream of water strike the building?
a. 9.60 m c. 18.7 m b. 16.6 m d. 22.4 m