An object sits at the edge of a table top with a mass of 180 kg. it is connected by a magical physics thread to a mass of 250 kg via a pulley which is hanging in the air below the edge of the table top. there is an unknown amount of friction between the 180 kg mass and the table. the entire thing is accelerating at 2 m/s/s towards the edge of the table (250 kg mass is moving down).
what is the force of friction?
what is the coefficient of friction?

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

What occurs during a combustion reaction