Shabbat

can I go on a docked boat before shabbos and keep shabbat on it while it is docked in the same place? What if the gang plank is up but it isnt moving? Can I walk on and off it on shabbos?

If you have a hot water urn that you set before Shabbat, and then during Shabbat, the power goes out and the water cools down, and then later, the power returns and the water is reheated without any human intervention, is it permitted to use that hot water on Shabbat?

What are the restrictions regarding modern convivences which have become part of daily life in the past 150 years e.g. telephones, cars, stoves etc. Who in the Jewish community, invited appliance corporations to decide that stoves should replace personal control over how Sabbat is observed.

What is the heter many Hasidim, and some non Hasidim, seem to use to permit dancing/clapping on Shabbat despite the clear gezeirah in Mishnah Beitzah

Is there any issur with a man removing or attaching cuffs on Shabbat

Hi, Am I allowed to use this mug on Shabbat? It turns from black to a picture when you put hot water in it.