Final answer:
Using the formula w = mg, with m = 3.9 kg and g = 9.80 m/s², the weight of a gallon of milk is calculated to be approximately 38.22 N. None of the provided answer choices are accurate.
Step-by-step explanation:
To calculate the weight of an object, you can use the formula w = mg, where w is the weight in newtons, m is the mass in kilograms, and g is the acceleration due to gravity (9.80 m/s² on Earth). For a gallon of milk with a mass of approximately 3.9 kg, the weight would be calculated as follows:
w = (3.9 kg)(9.80 m/s²) = 38.22 N.
Therefore, the closest answer given is 4) 19.6 N, but this is not correct as it is approximately half of the actual weight. It's important to always check the units and make sure that the answer makes sense within the context of the question. The correct weight of the gallon of milk is approximately 38.22 N.