Which of the following is not an example of condensation at Earth's surface?
A) clouds
B) dew
C) frost
D) fog
Answer: A
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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 brightest stars in a young open cluster will be
A) massive blue main-sequence stars. B) Cepheid variables. C) yellow main-sequence stars like the Sun. D) T-Tauri variables. E) red giants.
The suffix -ol in a compound's name signifies
a. an enzyme. b. an amide. c. an alcohol. d. a carbohydrate.
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of radius 40 m (as shown in the figure) the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?
a.
3.2 kN
b.
8.1 kN
c.
4.9 kN
d.
1.7 kN
e.
5.3 kN