Camera #1 has a lens of diameter 2.0 cm with a focal length of 5.0 cm, camera #2 has a lens of diameter 1.5 cm with a focal length of 4.5 cm, and camera #3 has a lens of diameter 1.1 cm with a focal length of 3.3 cm. Assuming all the cameras use the same type film and have a shutter speed of 1/200 s, which camera can give the best exposure at the lowest light level?
1.#3
2.#2
3.#2 and #3 are both equal and better than #1.
4.#1
4
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You observe a 1-cm-long crack in the middle of the glass windshield of your car. Compare the expected fracture strength of your defective glass windshield to that of a new one that has a tensile fracture strength of 69 MPa. Assume that the KIc of glass is 0.84 MPa?m1/2.
What will be an ideal response?
Wave Characteristics: A radar receiver indicates that a pulse return as an echo in 20 ?s after it was sent. How far away is the reflecting object? (c = 3.0 × 108 m/s)
A. 1.5 km B. 3.0 km C. 6.0 km D. 9.0 km
Two marbles are rolling along parallel tracks (which may or may not be inclined). A stroboscopic photograph showing a top view of the positions of the marbles at equally spaced instants of time looks like this:
At what instant(s) of time do the marbles have the same instantaneous velocity?
A. At time tB
B. At time tG
C. At both tB and tG
D. Some instant between tC and tD
E. Some instant between tD and tE
F. Roughly time tD
Unstable conditions and stormy weather can be expected with the passage of a
A) low pressure system. B) high pressure system.