Question

Сани движутся равномерно со скоростью 1,2 м/с. Какую работу совершает за 10 минут человек, тянущий сани с силой 50 Н, если веревка расположена под углом 60°

Answer 1

S=1.2м/c * 600 секунд= 720м
A=F*S*cos60=50*720/2= 360*50=18000 Дж или 18кДЖ

Answer 2

Calculation of Work Done

To calculate the work done by a person pulling the sled, we can use the formula:

Work = Force × Distance × cos(θ)

Where: - Force is the force applied by the person (50 N in this case) - Distance is the distance covered by the sled (10 m in this case) - θ is the angle between the force applied and the direction of motion of the sled (60° in this case)

Let's calculate the work done step by step.

1. Convert the time from minutes to seconds: - 10 minutes = 10 × 60 = 600 seconds

2. Calculate the speed of the sled in meters per second: - Given speed = 1.2 m/s

3. Calculate the distance covered by the sled: - Distance = Speed × Time - Distance = 1.2 m/s × 600 s = 720 meters

4. Calculate the work done: - Work = Force × Distance × cos(θ) - Work = 50 N × 720 m × cos(60°)

Now, let's calculate the value of cos(60°) and then calculate the work done.

Using the search results, I couldn't find the exact value of cos(60°). However, we know that cos(60°) = 0.5. Therefore, we can use this value to calculate the work done.

5. Calculate the work done (continued): - Work = 50 N × 720 m × 0.5 - Work = 18,000 Joules

Therefore, the person pulling the sled with a force of 50 N and a rope at an angle of 60° will perform 18,000 Joules of work over a distance of 10 meters in 10 minutes.