Self-heating meals would be useful during outdoor activities like camping, hiking, or boating where access to a stove or microwave is limited. They can also be handy during emergencies like power outages or natural disasters when traditional cooking methods are not available.
(example:)while driving from San Francisco to Boston
A broken scale would be used in situations where precise measurement is not critical or when the broken scale can still provide a relative indication. For example, in some art projects or DIY tasks where rough estimates are sufficient, a broken scale may still be useful.
If you could become invisible whenever you wanted to, you could conceal your presence and observe situations without being noticed. This ability could be useful for gathering information discreetly or for moving through dangerous situations undetected. However, overusing this power may lead to isolation or potential misuse for personal gain.
A gas syringe would be useful for collecting 50cm3 of gas as it allows for accurate measurement and collection of gases in a controlled manner.
Meters
A magnetic sweeper would be useful in a situation when someone needs to pick up and find metal items, such as iron. This may be useful in steel work companies.
(example:)while driving from San Francisco to Boston
Very relevant in fact its a useful thing to learn in today's society actually. If you know first aid then it would be useful in situations where someone is ill or injured for example.
Carpeting can be a useful in many situations. In areas where it is colder, carpet keeps the floors warmer then wood floors would. Carpeting also is easier to vacuum where wood flooring requires more care.
A formal style of writing is useful for formal, business situations between people who do not know each other. It is also useful when there is a significant difference in status between the writer and the audience.
In cases where the user (or system) knows exactly what data is going to be needed. Caches are algorithm-based, while a RAM disk is user-directed.
yes....it would be very useful
Most people eat about three meals a day but I would say eight or nine meals a day
4 meals, with snacks that make up for about the size of a dinner plate
As simple facts, your name and address would not be eligible for copyright protection. If you intend to use your name in commerce, you may choose to register it as a trademark, but there are very few situations in which this is necessary or useful.
In WWII an airplane would be useful to bomb the other countries.
singing would be useful in the future to entertain people