Waves on a String: A string of length L is under tension, and the speed of a wave in the string is v. What will be the speed of a wave in the string if the length is increased to 2L but with no change in the mass or tension?
A. v/2
B. v/
C. v
D. 2v
E. 4v
Answer: C
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For a certain ideal Carnot engine, the hot reservoir is 35°C higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A) 70.0 K B) 140 K C) 175 K D) 210 K E) 245 K
Scientific theories can never be proved true beyond all doubt
Indicate whether the statement is true or false
An auto weighing 3000 newtons has a forward drive force of 1000 newtons. Air resistance on the car is 100 newtons, and road resistance is 100 newtons. The auto moves along a straight level road. The net force on this auto is
A) 200 newtons backward. B) 1000 newtons forward. C) 800 newtons backward. D) 1200 newtons forward. E) 800 newtons forward.
The current in a circuit flows in the opposite direction to the direction in which the electrons move
Indicate whether the statement is true or false