The two teams involved in the discovery of the cosmic microwave background radiation were at:
A) NRAO and Cal Tech.
B) JPL and the Hubble Space Institute.
C) Kitt Peak and the University of Arizona.
D) Bell Labs and Princeton.
E) Mt. Palomar and the VLA.
D
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Free Fall: A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 80.5 m/s. Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is 89 m above the ground is closest to
A. -81 m/s. B. -64 m/s. C. -48 m/s. D. -32 m/s. E. -97 m/s.
A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves?
A) 442 Hz B) 351 Hz C) 419 Hz D) 322 Hz E) 670 Hz
A motor and a generator are
A. similar devices B. very different devices with different applications C. forms of transformers D. energy sources
A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.36 s. What is the height of the table? (g = 9.8 m/s2 and air resistance is negligible)
a. 0.72 m b. 0.55 m c. 0.016 m d. 0.64 m e. 0.65 m