The (NPN) transistor in this circuit is used to <em>switch a current</em>. When it switches current ON ... acting like a closed switch ... the light goes on.
It's kind of mystifying WHY all of this technological complexity is necessary. There's already a switch in the circuit ... (the two little circles above the 1K resistor in the base circuit with the tilted line between them). That switch could just as well be used, in place of the transistor, to directly switch the current through the light. Why use one switch to control a transistor to make it behave like another switch ? ?
The only actual necessity for doing this that makes sense is if the switch in the base circuit is a tiny low-power switch, and the transistor is a big moose high-power transistor, controlling a high-current, multi-kilowatt searchlight.
A place you might actually find an application like this would be in your car. A small current through the ignition switch behind the key is used to turn on a high-power transistor under the hood, which controls the huge current to the starter motor. That way, they avoid running a 100-Ampere cable in and out of the ignition switch, and needing a several-hundred-Ampere switch in the steering column behind the key.
Answer:
h = 69.6 m
Explanation:
Data:
- Vo = 25 m/s
- t = 2.0 s
- g = 9.8 m/s²
- h = ?
Formula:
Replace and solve:
The building has a height of <u>69.6 meters.</u>
Greetings.
Nuclear energy was not developed. It has existed for as long as time has existed, that is, since the big bang.
The thing that was developed was humans' ability to USE nuclear energy, to do what we want it to do, when we want it to do it.
The reason this was first developed was to bomb the holy beans out of Japan, in order to win World War II.
Today (2020), nine of the world's nations are known to have 14,285 nuclear bombs in storage, for the same general purpose. Seven of these nations are storing 1,170 of these bombs (about 8 percent), and the USA and Russia have all the rest ... 13,035 nuclear bombs.
All nine of these nations promise that they have no plan to use their bombs, they don't want to use them, it would be wrong and terrible to use them, and they will never be the first to use them, but they need to modernize their bombs so that theirs are better than anybody else's bombs, and they need to keep their bombs for as long as anybody else has any, and then maybe a little longer, just in case.
In the years after the ability to bomb the holy beans out of other people was developed, and enough equipment was built to do it 14 thousand times, the ability to use nuclear energy for other purposes was also developed. It's used now to generate electrical energy, and to do several jobs in Medical science.
