Sunspots are ________ poles in the photosphere
Fill in the blank(s) with correct word
magnetic
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The thermal efficiency e of a heat engine is defined as follows: e=W/Qh. Express the efficiency in terms of Qh and Qc.
A positive ion is formed when
a. a neutral atom gains an electron c. a negative ion loses an electron b. a neutral atom loses an electron d. all of the above
A 4.00 kg ball is moving at 3.00 m/s to the NORTH and a 5.00 kg ball is moving at 2.00 m/s to the NORTHWEST. The total momentum of the system is
A. 20.3 kg m/s at an angle of 89.7 degrees NORTH of EAST. B. 20.3 kg m/s at an angle of 24.6 degrees SOUTH of EAST. C. 26.1 kg m/s at an angle of 24.6 degrees NORTH of EAST. D. 26.1 kg m/s at an angle of 89.7 degrees SOUTH of EAST. E. 43.00 kg m/s at an angle of 45.0 degrees NORTH of EAST.
Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other at You hear the sound intensity increase and then decrease periodically due to wave interference
How long does it take between successive instances of the sound intensity increasing? A) 1.79 s B) 1.43 s C) 1.54 s D) 1.66 s