The work done by a variable force in moving an object between two points is equal to the area under the force versus displacement curve between those two points
Indicate whether the statement is true or false
TRUE
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A 5.0 ?C charge is placed at the 0 cm mark of a meter stick and a -4.0 ?C charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field zero?
A) 1.4 m from the 0 cm mark B) 2.5 m from the 0 cm mark C) 2.9 m from the 0 cm mark D) 3.3 m from the 0 cm mark E) 4.7 m from the 0 cm mark
A 16.2-g bullet with an initial speed of 870 m/s embeds itself in a 40.0-kg block, which is attached to a horizontal spring with a force constant of 1010 N/m. What is the maximum compression of the spring?
A) 6.34 cm B) 5.57 cm C) 3.42 cm D) 1.26 cm E) 7.01 cm
Which of the following represents the equipotential lines of a dipole?
a.
b.
c.
In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole in the wall of the furnace, of area 0.5 cm2
This hole acts like a perfect blackbody radiator having the same temperature as the interior of the furnace. If the temperature of the furnace (and therefore of the hole) is to be maintained at 1650°C, how much power will the hole radiate? A) 20 W B) 30 W C) 40 W D) 50 W