Star clusters have been observed within dark nebulae with:
A) optical movies made over decades.
B) radio interferometers.
C) infrared observations.
D) the Chandra X-ray observatory.
E) ultraviolet light creating the emission nebulae.
C
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A 120-g rubber ball is thrown with a speed of 10 m/s at an oncoming 900-kg car which is approaching at 30 m/s, and undergoes a one-dimensional elastic collision with the car. What is the speed of the ball after the collision?
A) 10 m/s B) 30 m/s C) 40 m/s D) 50 m/s E) 70 m/s
The unit for rate of energy transformation, the watt, in an electric circuit is equivalent to which of the following?
a. V/s b. A?? c. V?A d. V/?
The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C
What is the charge on the object? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) -4.5 nC B) +4.5 nC C) -5.0 nC D) +5.0 nC
What is the maximum wavelength photon that can produce a pair of tau particles (rest mass 1.777 GeV/c2) by pair production?
A. 8.72 x 10-8nm B. 3.49 x 10-7nm C. 6.98 x 10-7nm D. 1.74 x 10-7nm