If you float a piece of wood in a container brim-full of water that rests on a weighing scale, some water will spill. Then the weight reading on the scale will
A) decrease.
B) remain unchanged.
C) increase.
Answer: B
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If a boat is moving north at 15 kilometers per hour and a dog on that boat is running south at 8 kilometers per hour, what is the dog's velocity measured from the shore?
a. 7 kilometers north per hour. b. 23 kilometers north per hour. c. 15 kilometers north per hour. d. 150 mph east-south-east. e. 7 kilometers south per hour.
Aluminum alloys must be welded in an inert atmosphere because of the formation of aluminum _________if welding is performed in air.
Fill in the blank(s) with the appropriate word(s).
The frictional force, due to air resistance, acting on an object is always
A. in the direction of the object's motion. B. in the upward direction. C. greater than the net force. D. smaller than object's weight. E. in the opposite direction to the object's motion.
A spaceship with a constant velocity of 0.800c relative to Earth travels to the star that is 4.30 light-years from Earth. What distance does the space ship travel as measured by a passenger on the ship?
A) 2.58 light-years B) 3.52 light-years C) 4.12 light-years D) 4.30 light-years