An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image position (in cm)?
A. ?8
B. ?4
C. ?2
D. ?6
E. 30
Answer: D
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Which was the source of lava during the flooding stage of the Moon's development?
a. moonquakes and tectonic shifts b. lower crust and upper mantle c. the deep core d. volcanoes e. impacts
A copper tube with wall thickness of 8 mm must carry an axial tensile force of 175 kN. The allowable tensile stress is 90 MPa. The minimum required outer diameter is approximately:
(A) 60 mm
(B) 72 mm
(C) 85 mm
(D) 93 mm
The center of mass (or center of gravity) of a two-particle system is at the origin. One particle is located at (3.0 m, 0.0 m) and has a mass of 2.0 kg. The other particle has a mass of 3.0 kg. What is the location of the 3.0-kg particle?
A) (-3.0 m, 0.0 m) B) (-2.0 m, 0.0 m) C) (2.0 m, 0.0 m) D) (3.0 m, 0.0 m)
How large a force is necessary to stretch a 2.0-mm diameter copper wire (Y = 11 × 10^10 N/m2) by 1.0%?
a. 2.1 kN b. 3.5 kN c. 6.9 kN d. 11 kN e. 5.4 kN