A radio wave transmits 4.8 W/m2 average power per unit area. What is the peak value of the associated magnetic field? (m0 = 4p × 10^-7 T×m/A and c = 3.00 × 10^8 m/s)
a. 1.0 × 10^-7 T
c. 2.0 × 10^–7 T
b. 8.4 × 10^-3 T
d. 30 T
C
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A "galactic fountain" is _____
a. a stream of gas and dust being pulled into a galaxy as it forms b. a jet of high-speed superheated material thrown out of the accretion disk around a black hole c. a partial spiral arm formed by the collision of molecular clouds d. a bubble of hot, metal-rich gas ejected from the disk by a burst of supernova e. a stream of gas made from a star that has been torn apart while falling into a supermassive black hole
Why does a hot dog pant?
What will be an ideal response?
Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case
A) Galaxy 1 must be twice as big as Galaxy 2. B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2. C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2. D) Galaxy 2 must be twice as old as Galaxy 1.
The angle of rotation between the ends of a nylon bar is 3.58. The bar diameter is 70 mm and the allowable shear strain is 0.014 rad. The minimum permissible length of the bar is approximately:
(A) 0.15 m
(B) 0.27 m
(C) 0.40 m
(D) 0.55 m