A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum stress in the heads of the tank is approximately:
(A) 38 MPa
(B) 45 MPa
(C) 50 MPa
(D) 59 MPa
(A) 38 MPa
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River water flows around a circular 20-cm-diameter pier at 0.01 m/s. The flow is:
(A) Creeping flow (B) Flow with a wake (C) Stokes flow (D) Low-Reynolds-number flow
Projectile Motion: A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal. Neglect air resistance, take upward as the positive direction, and use g = 9.8 m/s2.(a) Determine the time necessary for the projectile to reach its maximum height.(b) Determine the maximum height reached by the projectile.(c) Determine the horizontal and vertical components of the velocity vector at the maximum height.(d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.
What will be an ideal response?
A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 ?. What is the average power loss?
a. 225 W b. 450 W c. 980 W d. 1.12 kW e. 900 W
In analyzing circuits in which resistors are wired partially in series and partially in parallel, which one of the following statements describes the preferred approach to take to determine the equivalent resistance in the circuit?
a) Find the sum of all the resistors. This is the equivalent resistance for the circuit. b) Break the circuit into smaller parts and find an equivalent resistance for each part. Then continue this process until all of the parts are added together correctly either in series or parallel until a single equivalent resistance is found. c) All together all of the resistors in series, ignoring any wired in parallel as they do not significantly add to the equivalent resistance of the circuit. The sum of the resistors in series is the equivalent resistance d) All together all of the resistors in parallel, ignoring any wired in series as they do not significantly add to the equivalent resistance of the circuit. The sum of the resistors in parallel is the equivalent resistance.