The base SI unit of mass is
A) milligram.
B) gram.
C) kilogram.
D) slug.
E) newton.
C
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The normal stress acting perpendicular to the weld is approximately:
(A) 39 MPa
(B) 48 MPa
(C) 78 MPa
(D) 84 MPa
The velocity v(t) of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?
A) -15 m/s2 B) 0 m/s2 C) 13 m/s2 D) 15 m/s2 E) -13 m/s2
A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. If the object starts from rest at the initial angular position, moves counterclockwise with constant angular acceleration, and arrives at the final angular position with the same angular speed in all three
cases, for which choice is the angular acceleration the highest? 1.3 rad, 6 rad 2.-1 rad, 1 rad 3.1 rad, 5 rad
A 0.20-kg object is oscillating on a spring with a spring constant of k = 30 N/m. What is the potential energy of the system when the object's displacement is 0.040 m, exactly half the maximum amplitude?
a. 0.96 J c. 0.012 J b. 0.024 J d. zero