A drive shaft resists torsional shear stress of 45 MPa and axial compressive stress of 100 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.15
(B) 0.55
(C) 1.2
(D) 1.9
(A) 0.15
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If you stand closer to a concave mirror than a distance of one focal length, the image you see is
A. real and inverted. B. real and upright. C. virtual and inverted. D. virtual and upright. E. none of the above because you do not get an image.
In a Young's double-slit experiment, both the wavelength and the slit separation are increased by 25%. What happens to the distance between two adjacent bright fringes?
a. It decreases by 50%. b. It increases by 50%. c. The distance increases by 25% or more. d. The distance stays the same.
A car travels for 140 km at 70.0 km/hr. It then travels an additional distance of 60.0 km 40.0 km/hr. The average speed is
A. 61.0 km/hr. B. 57.1 km/hr. C. 53.3 km/hr. D. 46.7 km/hr. E. 45.0 km/hr.
The Earth's atmosphere is the major factor limiting the use of ground-based radio telescopes
Indicate whether the statement is true or false