I was solving my assignment questions, and found two questions particularly challenging. So I post this thread to get some helps. 1. The problem statement, all variables and given/known data Question 1. Astronauts have connected a line between their 3500kg space tug and a 6200 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. They are at rest, 450 m apart. How much time does it take for them to meet? 3. The attempt at a solution At first glance, I thought that net force is 490N, and can never be stronger. Thus I concluded that this can be simplified such that the space tug is completely still and the asteroid is moving towards the tug with (490/9700)m/s^2. But I'm not so sure about this. In fact I think it's probably wrong. Should I distribute the force to each objects by their percent mass? 1. The problem statement, all variables and given/known data Question 2. A suitcase is on a baggage carousel at an airport. The case does not slid and is going around at a constant speed on a circle (r=11,0). The static friction is 0.760 and the angle is 36. How much time is required for the suit case to go around once? 3. The attempt at a solution For this one, I don't even know where to start. I used the equation g*r*tan (theta). After that, I was not able to go any further. Thanks.