I drove 2 hours and 25 minutes to the south for 125km. Then I rested for 30.0 minutes. I then drove another 45.0 minutes at 50.0km/hr

a. What is my average speed?

b. What is my average velocity?

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l

An object's buoyant force and weight mean the same thing.a. trueb. false

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.