A car of mass 1000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg/m2/s) relative to the center of the race track?
a. 5.0 × 10^2
b. 5.0 × 10^6
c. 2.5 × 10^4
d. 2.5 × 10^6
e. 5.0 × 10^3
b
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Answer the following statement true (T) or false (F)
A cast iron pipe (L 5 12 m, weight density 5 72 kN/m3, d2 5 100 mm, and d1 5 75 mm) is lifted by a hoist. The lift points are 6 m apart. The maximum bending stress in the pipe is approximately:
(A) 28 MPa
(B) 33 MPa
(C) 47 MPa
(D) 59 MPa
What is the purpose of the salt bridge in a voltaic cell?
A) to prevent any further migration of electrons through the wire B) to allow for the build up of positively charged ions in one container and negatively charged ions in the other container C) to allow the Fe2 and the Cu2+ to flow freely between the two containers D) to allow for a balance of charge between the two chambers
A -6.5-µC point charge is 8.0 cm from a -17-µC charge. What is the electric energy density at the point midway between them? (?0 = 8.85 × 10-12 C2/N ? m2, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
What will be an ideal response?