Curve of elecroexcitability is a dependence of

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

What is the length x of the side of the triangle below? (hint: use the cosine function)

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?