Recent content by brotherStefan

Wow. Someone wants to know what time it is, and we proceed to provide instructions on building an atomic clock. Getting back to the original question about understanding voltage. Voltage is the "prime mover" in an electrical system, just as a "push" is the prime mover in a mechanical system...

Can we assume that although it is not depicted, there exists some mechanism (a switch, possibly?) by which the circuit can be energized or de-energized at will?

In a universal motor, the armature and field are wired in series. To reverse the direction, the polarity of the field connection must be reversed with respect to that of the armature. Some that are designed to be reversible will have two sets of field windings to allow the direction to be...

One would use rule 1 when the "5" (in your example) is known to imply a counted value (usually a unitless number). In such a case, the counted value is exact, and therefore is considered to represent an infinite number of significant figures. Rule 2 would apply if, for example, one were...

Somewhere you will need to determine the heat transfer coefficients for the tubing you plan to use in order to determine how much tubing needs to be in the ice box. And I'm not sure how you would control the heat transfer rate when the system is operational, nor do I have a good idea of how the...

It appears that each of the various networks involve capacitors in a steady state -- there would be no current flow. It seems you are being asked to determine the voltage potential that exists between points a & b in each network. You need to apply Kirchhoff's voltage laws.

You might also check the Standard Handbook for Mechanical Engineers. Gears are discussed in chapter 8. Alternatively, there is the Tool & Manufacturing Engineers Handbook. Gears are discussed in chapter 11.

I'm not sure I understand your procedure or objective. Is the Slinky initially suspended from a fixed stand? Before you stretch the Slinky, are its coils fully compressed? Are you trying to determine how much energy is lost in the rebound?

As I mentioned, air is a good insulator, so you will want to avoid the condition of the ice melting away from your network of tubing inside the ice box, leaving pockets of air. Once you have charged the ice container with ice, add enough initial water to cover the interior plumbing network so...

Draw the vector (3i + 4j) on a piece of graph paper. When you measure the length (it's magnitude or absolute value) of this vector, you will find it has a length of 5 units, even though the sum of the i and j components is 7. Now draw the vector (3i - 4j) and measure the length of this vector...

The simple answer is that your 9000 BTU air conditioner would theoretically produce the equivalent of 3/4 of a ton (or 680 Kg) of ice (at 0ºC) per day (or about 230 Kg for 8 hours). The more complicated question is, how will you melt that mass of ice in 8 hours? Considering that still air is a...

You beat me to the punch. ;-)

With the car in motion, the stated problem is a dynamic, not a static one. A vehicle traveling around a circular track at a constant speed is still accelerating by virtue of the continuously changing direction of the constant speed's instantaneous vector as the car moves around the track. The...

Let's back up here a second... The centripetal force is not caused by the angle of the track -- a straight track could have a similar slope, but it would not cause the car to travel in a circular path (although the driver would have to fight gravity trying to pull him down the slope, that would...

A coat hanger is a classic example of a rigid object whose center of mass is usually in mid air.