Me guys asap, thxin the diagram shown, what force is required to keep an object of mass m from slipping off the disk? p. s (i hate physics)

Explain vector addition, triangle method and parallelogram method

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?