Where jets run into surrounding gas in the intergalactic medium, ____________ are formed before feeding the lobes
Fill in the blank(s) with correct word
hot spots
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Carbon-14 Dating: Modern in-air nuclear bomb tests have created an extra high level of 14C in our atmosphere. If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why?
A. Too young. B. Too old. C. Correct, since 14C from bomb tests is different from that produced naturally. D. Correct, because modern biological materials do not gather 14C from bomb tests.
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s B. 0.10 km/s C. 0.16 km/s D. 0.23 km/s E. 0.06 km/s
An umbrella tends to jerk upward on a windy day principally because
A) air gets trapped under the umbrella, which warms, and rises. B) buoyancy increases with increasing wind speed. C) air pressure is reduced over the curved top surface. D) all of the above
The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2 . At an instant when the magnitude of the total acceleration is 6.0 m/s2, what is the speed of the particle?
a. 3.9 m/s b. 2.9 m/s c. 3.5 m/s d. 3.0 m/s e. 1.4 m/s