Question

Автобус массой 10 т трогается с места и за первые 10 с своего движения приобретает скорость 18 км/ч. Определите, какую работу совершает сила тяги автобуса за это время, если сила сопротивления его движению равна 500 Н.

Answer 1

скороcть=at

а=5/10=0,5 м/с в кавадрате. 5 м/с у меня получилсоь так как я 18/3,6 это его скорость...

ma=F-Fсопротивления

F=ma+F=10*10 в 3*0,5+500=5000+500=5500 Н  

 

 

Answer 2

Calculation of Work Done by the Driving Force of a Bus

To determine the work done by the driving force of a bus, we need to use the formula:

Work = Force × Distance

In this case, the force is the driving force of the bus, and the distance is the distance traveled by the bus in the given time.

Given information: - Mass of the bus = 10 t (tonnes) - Initial velocity = 0 km/h (since the bus starts from rest) - Final velocity = 18 km/h - Time taken = 10 s - Resistance force = 500 N

To calculate the distance traveled by the bus, we can use the formula:

Distance = Average Velocity × Time

The average velocity can be calculated by taking the average of the initial and final velocities.

Let's calculate the average velocity first:

Average Velocity = (Initial Velocity + Final Velocity) / 2

Average Velocity = (0 km/h + 18 km/h) / 2 = 9 km/h

Now, let's convert the average velocity to meters per second (m/s) for consistency:

Average Velocity = 9 km/h × (1000 m/1 km) × (1 h/3600 s) = 2.5 m/s

Using the formula for distance, we can calculate the distance traveled by the bus:

Distance = Average Velocity × Time = 2.5 m/s × 10 s = 25 m

Now that we have the distance, we can calculate the work done by the driving force of the bus:

Work = Force × Distance

The force can be calculated using Newton's second law of motion:

Force = Mass × Acceleration

Acceleration can be calculated using the formula:

Acceleration = (Final Velocity - Initial Velocity) / Time

Acceleration = (18 km/h - 0 km/h) / 10 s = 1.8 km/h/s

Converting the acceleration to meters per second squared (m/s^2):

Acceleration = 1.8 km/h/s × (1000 m/1 km) × (1 h/3600 s) = 0.5 m/s^2

Now, let's calculate the force:

Force = Mass × Acceleration = 10,000 kg × 0.5 m/s^2 = 5,000 N

Finally, we can calculate the work done by the driving force of the bus:

Work = Force × Distance = 5,000 N × 25 m = 125,000 J (Joules)

Therefore, the work done by the driving force of the bus in the given time is 125,000 Joules.