The crew men in space are discussing whether they can crack a wall nut with a hammer.

Man A says that hitting wall nut with a hammer would be no more effective than hitting it
with a feather. Because the hammer is weightless in space. Man B says that he found mass
of the hammer to be about 1kg by comparing it with known masses on a equal even
balance or mass balance. He could break the wall nut as easily has back on earth. Man C
maintain the comparison with the masses proved nothing because out in space these two
are weightless. Can they crack the wall nut? Comment on the statements of the crew men.

To determine whether the crew can crack a wall nut in space, let's analyze the statements made by each crew member:

Man A states that hitting a wall nut with a hammer would be no more effective than hitting it with a feather because the hammer is weightless in space. This statement is incorrect. While it is true that objects in space experience weightlessness, the effectiveness of hitting an object does not solely depend on weight. The force applied during impact is what matters. Even though the hammer is weightless, it still possesses mass and can transfer that mass into force when swung.

Man B claims to have found the mass of the hammer to be about 1kg by comparing it with known masses on an equal even balance or mass balance. This method can be an effective way to estimate the mass of an object in space since weight cannot be used as a reference. If Man B's estimation is accurate, the 1kg mass of the hammer can still exert force when swung and potentially crack the wall nut.

Man C argues that the comparison of masses proves nothing in space because both objects (hammer and nut) are weightless. Weightlessness has no impact on the comparison of masses, as masses remain constant regardless of the presence of gravity. Man C's statement is incorrect as weightlessness does not negate the comparison of masses.

In conclusion, based on Man B's estimation that the hammer has a mass of 1kg, it is reasonable to believe that the crew can crack the wall nut in space by using the hammer. Weightlessness does not affect the hammer's ability to impart force, and the mass of the hammer indicates that it could generate enough force to crack the nut.