A machine gun fires 60.0 gram bullets at 6 bullets a second. If the velocity of the bullets is 600 m/s, then the average force on the machine gun is
A. 67.0 N.
B. 75.0 N.
C. 94.0 N.
D. 109 N.
E. 216 N.
E. 216 N.
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A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h b. 4 km/h c. 5 km/h d. 6 km/h e. 7 km/h
An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A) 2.2 cm in front of the mirror B) 2.2 cm behind the mirror C) 9.0 cm in front of the mirror D) 1.0 cm behind the mirror
A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
a. 16 N b. 27 N c. 32 N d. 11 N e. 3.0 N
Rain or snow that falls on the continents is Earth's only
A) supply of water. B) supply of fresh water. C) hydrologic cycle. D) source of evaporation and condensation.