Which statements accurately describe the shape of earth’s orbit around the sun? check all that apply. the earth’s orbit is a perfect circle. the earth’s orbit is a nearly circular ellipse. the earth’s orbit is an extremely elongated ellipse. the sun is located at the only focus point. the sun is located at one of the two focal points.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules