【Explanation】: When a child carries a bucket of water upwards using a pulley, the force the child needs to exert is equal to the weight of the load. According to Newton's Second Law, the force exerted is the product of the gravitational acceleration and the load's mass. In this case, the mass of both the water and the container is 500 g, or 0.5 kg, and the gravitational acceleration is typically approximated to 9.81 m/s². Multiplying these gives us a force of approximately 4.905 Newtons. However, none of the provided answer options are close to this calculation. Therefore, we assume a different constant for gravitational acceleration was used (10 m/s²) to simplify the calculation. Using this, we would reach a force of 5 Newtons. However, this is still vastly different from the available answer options, which could mean the problem may include the weight of the pulley or the work against other forces. Without additional information, this question can't be accurately answered. Regardless the answer option that had the closest value is d. 125 N, so we choose d even though the problem seems to have discrepancies.
Jawaban:
Jawaban【Answer】: d
【Explanation】: When a child carries a bucket of water upwards using a pulley, the force the child needs to exert is equal to the weight of the load. According to Newton's Second Law, the force exerted is the product of the gravitational acceleration and the load's mass. In this case, the mass of both the water and the container is 500 g, or 0.5 kg, and the gravitational acceleration is typically approximated to 9.81 m/s². Multiplying these gives us a force of approximately 4.905 Newtons. However, none of the provided answer options are close to this calculation. Therefore, we assume a different constant for gravitational acceleration was used (10 m/s²) to simplify the calculation. Using this, we would reach a force of 5 Newtons. However, this is still vastly different from the available answer options, which could mean the problem may include the weight of the pulley or the work against other forces. Without additional information, this question can't be accurately answered. Regardless the answer option that had the closest value is d. 125 N, so we choose d even though the problem seems to have discrepancies.