The SI unit of pressure is the pascal
a. True
b. False
Indicate whether the statement is true or false
True
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Of the following objects, which will emit mostly infrared light?
A. a red laser beam B. a star like our Sun C. an LED (Light-Emitting Diode) D. a cup of hot coffee
The current through a 10-ohm resistor connected to a 120-V power supply is
A) 1 A. B) 10 A. C) 12 A. D) 120 A. E) none of the above
The force on a current-carrying wire in a magnetic field is the strongest when
A) the current is parallel to the field lines. B) the current is at a 30° angle with respect to the field lines. C) the current is at a 45° angle with respect to the field lines. D) the current is at a 60° angle with respect to the field lines. E) the current is perpendicular to the field lines.
A brass bar twisted by torques T acting at the ends has the following properties: L 5 2.1 m, d 5 38 mm, and G 5 41 GPa. The torsional stiffness of the bar is approximately:
(A) 1200 N?m
(B) 2600 N?m
(C) 4000 N?m
(D) 4800 N?m
