When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the diameter of this resistor is now tripled, the current will be
A) 18 A. B) 2/9 A. C) 2 A. D) 3 A. E) 2/3 A.
A
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Identical masses m are attached to identical springs of spring constant k suspended from the ceiling. With both masses hanging in their equilibrium positions, mass A is pulled down 10 cm and released while mass B is pushed up 10 cm and released. Which statement is correct?
a. Mass A will travel a smaller distance to its highest point than mass B will travel to its lowest point. b. Mass A will travel a greater distance to its highest point than mass B will travel to its lowest point. c. Masses A and B will travel equal distances between their highest and lowest points. d. More work was done on mass A by the extending force than on mass B by the compressing force. e. The total work done on mass A by the extending force was equal to the total work done on mass B by the compressing force.
The amount of light reflected from the front surface of common window glass is about
A) 4%. B) 8%. C) 40%. D) 92%. E) 96%.
Magnetic fields are created by moving charged particles.
Answer the following statement true (T) or false (F)