If we are directly in the line of a jet coming out of the lobe galaxy's core, we see a:
A) hypernovae.
B) pulsar.
C) quasar.
D) blazar.
E) magnetar.
D
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A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren relative to the police car is 500 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? (The speed of sound in air is 343 m/s.)
a. 396 b. 636 c. 361 d. 393 e. 617
What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer
a. 1.8 × 10^11 years b. 1.8 × 10^10 years c. 1.8 × 10^8 years d. 1.8 × 10^6 years e. 1.8 × 10^3 years
A 101-MHz radio wave has vibrations per second of
A) less than 101,000,000. B) 101,000,000. C) more than 101,000,000.
An aluminum cantilever beam (E 5 72 GPa) with a square cross sec-tion and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm