Una caja de 45 kg es tirada 38m a lo largo del piso por una persona que ejerce una fuerza constante de 112n formando un angulo de 42grados con la horizontal y existe una fuerza resistiva de 45n calcule el trabajo efectuado por las fuerzas que actuan sobre la caja y el trabajo neto porfavor ayudenme

How many molecules are present in 3 mols of silicon dioxide (sio2)?

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.

Aracecar driver has to hold on tightly when going around a banked curve. approximately what is the centripetal force on a 2220.0 kg car going around a circle with a diameter of 190.0 meters at 25.0 m/s?