Acrane can lift a 900 kg mass to height of 50 m in 2 minutes. calculate the work
done by the crane.

The work done by the crane is, W = 441000 J

The power of the crane is, p = 3675 watts

Explanation:

Given data,

The mass of the object, m = 900 kg

The object is lifted to the height, h = 50 m

The time taken to lift the mass, t = 2 min

                                                      = 120 s

The work done by the crane on the object is equal to the potential energy of the object at that height. It is given by the formula,

                                    W = P.E = mgh joules

Substituting the values in the above equation

                                     W = 900 kg x 9.8 m/s² x 50 m

                                         = 441000 J

The work done by the crane is, W = 441000 J

The power of the crane,

                                  P = W / t

                                     = 441000 J / 120 s

                                     = 3675 watts

Hence, the power of the crane is, p = 3675 watts

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.