Question

Estimate the work you do to mow a lawn 10m by 20m with a 50-cm-wide mower. Assume you push with a force of about 15 N. When the load is raised, how much energy with a 50-cm-wide mower. Assume you push with a force of about 15 N. When the load is raised, how much energy rope must be pulled up? Account for every centimeter.

a. 1500 J
b. 750 J
c. 3000 J
d. 450 J

Answer 1

To estimate the work done to mow a lawn, calculate the force exerted, distance covered, and width of the mower. Use the formula: Work = Force × Distance × Cos(angle). The estimated work is 3000 J.

Step-by-step explanation:

To estimate the work done to mow a lawn, we need to calculate the force exerted, the distance covered, and the width of the mower. The work done can be calculated using the formula:

Work = Force × Distance × Cos(angle)

In this case, the force exerted is 15 N, the distance is 10 m × 20 m = 200 m^2, and the angle is 0 degrees (since the mower is pushed horizontally). Using the formula, the work done is:

Work = 15 N × 200 m^2 × Cos(0°) = 3000 J

Therefore, the estimated work you do to mow the lawn is 3000 J. So, the correct answer is c. 3000 J.