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Is the circle or straight line symbol on or off for an electrical switch?
Simply put, the straight line is the on, and the circle is the off. These symbols represent an electrical circuit. The Straight line represents a closed circuit, which means the switch is on and the electric current can travel through it, and the circle means and open circuit, where the current cannot travel because the circuit is open. A quick trick to remember: "O, Open, Off".
Which way does a parabola open when the coefficient of its y2-term, a, is positive?
Open to the right. Like the sign for a proper subset, or a rounded version of the less than symbol, <.
What does a pentagon with two right angles look like?
It looks like an envelope with the flap wide open.
What does a microphone look like?
have you ever used a phone? buy a cheep one and crack it open...
What does a quadrilateral with no lines of symmetry look like?
A squashed open box? Alternatively, a right-angle trapezium: ............................ .-------------....... .|..................\...... .|...................\..... .|....................\.... .|......................\.. .-----------------. ............................
